Alameda County Deputy etc. v. Alameda County Employees' etc. ( 2020 )


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  •      IN THE SUPREME COURT OF
    CALIFORNIA
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSOCIATION
    et al.,
    Plaintiffs and Appellants,
    v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT
    ASSOCIATION et al.,
    Defendants and Respondents;
    STATE OF CALIFORNIA et al.,
    Interveners and Appellants.
    ****
    CONTRA COSTA COUNTY DEPUTY SHERIFF’S
    ASSOCIATION et al.,
    Plaintiffs and Appellants,
    v.
    CONTRA COSTA COUNTY EMPLOYEES’ RETIREMENT
    ASSOCIATION et al.,
    Defendants and Respondents;
    STATE OF CALIFORNIA et al.,
    Interveners and Appellants.
    ****
    AMERICAN FEDERATION OF STATE, COUNTY AND
    MUNICIPAL EMPLOYEES et al.,
    Plaintiffs and Appellants,
    v.
    MERCED COUNTY EMPLOYEES’ RETIREMENT
    ASSOCIATION et al.,
    Defendants and Respondents;
    STATE OF CALIFORNIA et al.,
    Interveners and Appellants.
    S247095
    First Appellate District, Division Four
    A141913
    Alameda County Superior Court
    RG12658890
    Contra Costa County Superior Court
    MSN12–1870
    Merced County Superior Court
    CV003073
    July 30, 2020
    Chief Justice Cantil-Sakauye authored the opinion of the
    Court, in which Justices Chin, Corrigan, Liu, Cuéllar, Kruger,
    and Groban concurred.
    Justice Cuéllar filed a concurring opinion.
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    S247095
    Opinion of the Court by Cantil-Sakauye, C. J.
    The California Public Employees’ Pension Reform Act of
    2013 (PEPRA; Stats. 2012, ch. 296, § 1) substantially revised the
    laws governing the pension plans of the state’s public
    employees. In a prior decision, Cal Fire Local 2881 v. California
    Public Employees’ Retirement System (2019) 
    6 Cal.5th 965
     (Cal
    Fire), we rejected a constitutional challenge to one change
    effected by PEPRA, the elimination of the opportunity for public
    employees to purchase “additional retirement service credit”
    under Government Code section 20909. The present decision
    addresses legal issues raised by a different provision of PEPRA,
    which amended the County Employees Retirement Law of 1937
    (CERL; Gov. Code, § 31450 et seq.).1
    CERL governs the pension systems maintained by many
    of the state’s counties. Each county system is administered by
    1
    Unless indicated otherwise, all further statutory citations
    are to the Government Code.
    We use the abbreviation “PEPRA” in its popular sense to
    refer to Assembly Bill No. 340 (2011-2012 Reg. Sess.) (Assembly
    Bill 340), which enacted the amendment under consideration
    here. (Stats. 2012, ch. 296, § 28.) Assembly Bill 340 formally
    gave the name “California Public Employees’ Pension Reform
    Act of 2013” only to newly added article 4 of Chapter 21 of the
    Government Code, which spans sections 7522 – 7522.74. (Stats.
    2012, ch. 296, § 15.)
    1
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    its own retirement board, which is tasked with implementing
    CERL’s provisions. Under CERL, the amount of an employee’s
    pension benefit is determined as a percentage of the
    “compensation earnable” received by the employee during a
    representative year of county employment. Even before PEPRA,
    CERL expressly excluded overtime pay from compensation
    earnable and limited the inclusion of payments from a deferred
    compensation plan. The PEPRA provision at issue here
    amended CERL’s definition of compensation earnable to exclude
    or limit the inclusion of additional types of compensation in an
    effort to prevent perceived abuses of the pension system.
    Although this amendment applies to the calculation of the
    pensions of all employees covered by CERL, the parties agree
    that the issues raised in this appeal relate only to the
    amendment’s impact on the pensions of persons who were first
    employed by a county prior to the effective date of PEPRA,
    referred to as “legacy employees.”
    This challenge to PEPRA’s amendment of CERL raises
    two sets of issues. First, the Alameda County Deputy Sheriff’s
    Association (Association) and its coplaintiffs (collectively,
    plaintiffs) contend that employees in the three counties involved
    in this matter have a contractual right to receive pension
    benefits calculated without regard to PEPRA’s changes, a right
    based either on (1) agreements in effect when PEPRA was
    enacted or (2) application of the doctrine of equitable estoppel.2
    2
    As explained below, this matter resulted from the
    consolidation of three separate lawsuits filed by organizations
    representing employees of Alameda, Contra Costa, and Merced
    Counties. Among the plaintiffs in these actions, only those in
    2
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Long prior to the passage of PEPRA, employees in each of these
    counties had entered into litigation settlement agreements with
    their respective retirement boards that specify the types of
    compensation included in compensation earnable. In some
    cases, the provisions added by PEPRA conflict with the terms of
    these agreements, excluding or restricting items of
    compensation that the agreements require to be included in
    compensation earnable. Plaintiffs argue that these agreements
    confer on existing employees the contractual right to continue to
    include these items of compensation in their pensionable
    compensation, notwithstanding their exclusion by the
    provisions added by PEPRA, or, alternatively, that the counties
    are equitably estopped from implementing the PEPRA
    amendment in a manner inconsistent with the agreements. In
    turn, Central Contra Costa Sanitary District (District) and the
    State of California (State) (collectively, defendants) respond that
    the retirement boards are required to implement the provisions
    of CERL, including PEPRA’s amendment, notwithstanding any
    contrary agreements they might have entered into with county
    employees.3
    the Alameda County action petitioned this court for review of
    the Court of Appeal’s decision. The plaintiffs in the Contra
    Costa and Merced actions filed respondents’ briefs in this court
    advancing positions similar to those of the Association and its
    coplaintiffs.
    3
    In addition to the petition for review filed by the
    Association, we granted petitions for review filed by both the
    District and the State. The District had been joined as a
    defendant in the Contra Costa County action because its
    employees participate in a CERL pension plan. Although not
    3
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Wholly apart from these ordinary contract issues,
    plaintiffs also contend that county employees who began their
    work prior to PEPRA’s enactment have a constitutional right to
    receive pension benefits calculated according to the law as it
    existed prior to PEPRA. Since at least the middle of the last
    century, our precedents have granted constitutional protection
    to public employee pension plans. Under the “California Rule,”
    as it has come to be known (Cal Fire, 
    supra,
     6 Cal.5th at p. 971),
    the contract clause of the state Constitution requires any
    modification of public employee pension plans to satisfy a
    standard established in a long line of California Supreme Court
    decisions, including most prominently Allen v. City of Long
    Beach (1955) 
    45 Cal.2d 128
     (Allen I). As explained below, in
    determining the constitutional validity of a modification to a
    public employee pension plan, Allen I requires a court first to
    determine whether the modification imposes disadvantages on
    affected employees, relative to the preexisting pension plan,
    and, if so, whether those disadvantages are accompanied by
    comparable new advantages. Assuming the disadvantages are
    not offset in this manner, the court must then determine
    whether the agency’s purpose in making the changes was
    sufficient, for constitutional purposes, to justify an impairment
    of pension rights. Public employee pension plans may be
    modified “for the purpose of keeping [the] pension system
    flexible to permit adjustments in accord with changing
    conditions and at the same time maintain the integrity of the
    system,” but to survive contract clause scrutiny, such changes
    initially a party, the State was permitted to intervene in all
    three of the consolidated actions to defend PEPRA.
    4
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    “must bear some material relation to the theory of a pension
    system and its successful operation.” (Id. at p. 131.) Finally,
    assuming the changes occurred for a constitutionally
    permissible purpose, we interpret Allen I to require the
    modification to provide comparable new advantages to public
    employees unless to do so would undermine, or would otherwise
    be inconsistent with, that proper purpose.
    Invoking the contract clause, plaintiffs argue that persons
    employed by a county at the time of PEPRA’s enactment
    possessed implied contractual rights in the pre-PEPRA terms of
    CERL that are protected against impairment.              Because
    PEPRA’s amendment has the practical effect of diminishing
    some employees’ pension benefits without granting any
    comparable new advantages, plaintiffs contend, its application
    to the pensions of existing employees is precluded by the
    California Rule. In turn, defendants respond that (1) PEPRA’s
    amendment did not trigger constitutional scrutiny because its
    provisions constituted a clarification, rather than a modification
    of CERL, and, alternatively, (2) any changes met the
    requirements of the California Rule.
    With regard to the ordinary contract issues, we hold that
    county employees have no express contractual right to the
    calculation of their pension benefits in a manner inconsistent
    with the terms of the PEPRA amendment. Because the county
    retirement boards are required to implement CERL as enacted
    by the Legislature, the settlement agreements, which are silent
    on this issue, must be interpreted to permit the modification of
    board policies to accommodate statutory changes to CERL. In
    addition, we conclude that plaintiffs have failed to demonstrate
    the elements necessary for the invocation of equitable estoppel.
    5
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    In particular, there is no evidence that the county boards made
    any representations regarding the continued enforceability of
    the terms of the settlement agreements in the event of
    inconsistent legislative changes to the controlling statutory
    provisions.
    With regard to the constitutional question, we reject
    defendants’ threshold argument that no constitutional issue is
    presented here because the exclusions and limitations from
    compensation earnable imposed by PEPRA did not constitute a
    change in the law governing CERL pension benefits. Although
    the inclusion in compensation earnable of the elements of
    compensation excluded by PEPRA had not been specifically
    addressed when the amendment was enacted, either in CERL
    itself or its judicial interpretations, the more general law of
    compensation earnable was sufficiently settled prior to PEPRA
    to justify treating the amendment as a change in the law for
    purposes of contract clause analysis. With respect to the merits
    of plaintiffs’ constitutional claim, however, we hold that the
    challenged provisions added by PEPRA meet contract clause
    requirements. They were enacted for the constitutionally
    permissible purpose of closing loopholes and preventing abuse
    of the pension system in a manner consistent with CERL’s
    preexisting structure. Further, it would defeat this proper
    objective to interpret the California Rule to require county
    pension plans either to maintain these loopholes for existing
    employees or to provide comparable new pension benefits that
    would perpetuate the unwarranted advantages provided by
    these loopholes.
    6
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    I. BACKGROUND
    CERL establishes an optional employee pension system
    for county adoption. Of our state’s 58 counties, 20 have chosen
    to implement their pension plans under CERL. (Irvin v. Contra
    Costa     County     Employees’    Retirement      Assn.    (2017)
    
    13 Cal.App.5th 162
    , 169, fn. 6.) The remaining counties either
    operate an independent retirement system or contract with the
    state’s pension plan, the Public Employees’ Retirement System
    (CalPERS; § 20000 et seq.). (Irvin, at p. 169, fn. 6.) Because the
    legislation at issue here applies only to CERL, the pensions of
    persons employed by counties that do not participate in CERL
    are not directly affected by our decision. For convenience, our
    subsequent references to “counties” and “county employees” in
    this decision should be understood to refer only to counties that
    maintain a pension plan under CERL and persons employed by
    those counties.
    In addition, as noted above, the arguments raised by the
    parties apply only to county employees who were employed prior
    to PEPRA’s effective date. PEPRA made substantial changes in
    the law applicable to the pensions of public employees hired
    after its effective date that are not applicable to the pensions of
    legacy public employees, but none of those changes is at issue
    here. Again for convenience, unless stated otherwise, references
    to “county employees” in the remainder of this decision include
    only persons who were first employed by a county prior to
    PEPRA’s effective date. Similarly, our description of the
    provisions of CERL addresses only those provisions applicable
    to such legacy employees. Employees hired post-PEPRA are
    often subject to alternate statutory provisions, and, as a general
    matter, we do not address those provisions.
    7
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    A. County Employee Pensions Under CERL
    CERL contains a collection of alternative pension
    provisions tailored to individual counties and subsets of workers
    within those counties. (See, e.g., §§ 31486, 31487, 31496, 31499,
    31511, 31676.01–31676.19.) Notwithstanding this tailoring, the
    county plans are identical in their general approach, although
    the details in the following description vary among them.
    Each county maintains its own pension plan,
    administered by a retirement board whose general membership
    is dictated by statute. (§§ 31520, 31520.1; see Lexin v. Superior
    Court (2010) 
    47 Cal.4th 1050
    , 1095–1096 [discussing the
    composition of retirement boards].) Under the California
    Constitution, such retirement boards have “plenary authority
    and fiduciary responsibility for investment of moneys and
    administration of the system.” (Art. XVI, §17.) Both the county
    and its employees must make regular contributions to their
    plan’s pension fund in amounts determined by the county board
    of supervisors, upon recommendation of the retirement board.
    (§§ 31453, 31453.5, 31454, 31621.)
    In general terms, a county employee becomes eligible to
    retire after he or she has worked for the county for at least ten
    years and has attained the age of 55, although the county board
    of supervisors has the discretion to lower the minimum age of
    retirement to 50 years. (§ 31672, subd. (a).) Once vested county
    employees reach the minimum retirement age, they may elect
    8
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    to retire and begin receiving monthly retirement benefits.4
    (§ 31672, subd. (a).)
    CERL contains a series of statutory benefit schedules that
    may be adopted by a participating county. (§§ 31676.01–
    31676.19.) These schedules determine the amount of a retiring
    employee’s pension benefit, which is calculated on the basis of
    the employee’s (1) age at retirement, (2) years of service, and
    (3) final compensation. Final compensation, explained further
    below, is roughly equivalent to the employee’s annual
    compensation, and it depends directly on “compensation
    earnable,” the statutory term amended by PEPRA. Under one
    typical schedule, for example, a retiring employee will receive
    an annual pension benefit equal to one-sixtieth of his or her final
    compensation for each year of county employment, multiplied by
    4
    As explained in Cal Fire, supra, 
    6 Cal.5th 965
    , use of the
    term “vested” is potentially confusing here because the term is
    used in two different ways in discussing pensions. (Id. at p. 972,
    fn. 3.) County employees become eligible to receive a pension
    after ten years of county employment. (§ 31672, subd. (a).) Once
    an employee has become qualified to receive a pension by
    satisfying this minimum service requirement, he or she is said
    to be “vested” with respect to the receipt of a pension. That is
    not the same as having a “vested right” in a particular pension
    benefit. The term “vested right” has come to refer to a benefit of
    public employment whose repeal or other divestment is
    constrained by the constitutional contract clause. (Cal Fire, at
    p. 972, fn. 3.) To further compound the confusion, “vested right”
    means different things in other legal contexts. (E.g., Avco
    Community Developers, Inc. v. South Coast Regional Com.
    (1976) 
    17 Cal.3d 785
    , 791 (Avco) [“vested right” to pursue a
    permitted real estate development].)
    9
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    a number derived from a table in the statute.5 (§ 31676.1.) That
    number is determined by the employee’s age at retirement and
    increases gradually with retirement age, reaching a maximum
    for retirement at age 65. (Ibid.) This last calculation leads an
    employee who retires at a more advanced age to receive a
    greater pension benefit than a similarly situated employee who
    retires at a younger age.
    As this description demonstrates, a county employee’s
    final compensation is a critical factor in determining the amount
    of his or her pension benefit, because the benefit is calculated as
    a percentage of final compensation. All other things being
    equal, the greater an employee’s final compensation, the greater
    will be the monthly pension benefit.
    B. Compensation Earnable
    At issue in this matter is PEPRA’s amendment of section
    31461, the CERL provision defining the term “compensation
    earnable.” Final compensation, which factors directly into the
    5
    Pension benefits under CERL are composed of two
    elements, a “service retirement annuity” and a “current service
    pension.”     (§§ 31673-31675; O’Neal v. Stanislaus County
    Employees’ Retirement Assn. (2017) 
    8 Cal.App.5th 1184
    , 1199.)
    Our example does not discuss the distinction between these two
    elements because it appears to make no practical difference in
    the size of an employee’s pension benefit. Under the benefit
    schedules, the amount of the current service pension is
    calculated to result in an identical pension benefit for employees
    with identical circumstances of retirement, without regard to
    the respective size of their service retirement annuities. (E.g.,
    §§ 31676.01, 31676.1 [current service pension is calculated so
    that, “when added to the service retirement annuity,” the total
    pension benefit will have a particular value].)
    10
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    pension benefit calculation, is statutorily defined as an
    employee’s annual compensation earnable, received either in a
    single specific year or calculated as an average over three
    specific years.6 (§§ 31462, 31462.1; Ventura County Deputy
    Sheriffs’ Assn. v. Board of Retirement (1997) 
    16 Cal.4th 483
    , 499
    (Ventura County).) The basis for a county employee’s pension
    benefit is therefore the annual compensation earnable received
    by the employee in the period during which final compensation
    is determined.
    Compensation earnable, in turn, is defined in section
    31461 as the employee’s “average compensation . . . for the
    period under consideration upon the basis of the average
    number of days ordinarily worked by persons in the same grade
    or class of positions during the period, and at the same rate of
    pay. The computation for any absence shall be based on the
    compensation of the position held by the member at the
    beginning of the absence.”7 (§ 31461, subd. (a).) For purposes of
    this definition, “compensation” is statutorily defined as the
    employee’s “remuneration paid in cash . . . but does not include
    6
    The three-year average governs unless the county board of
    supervisors affirmatively elects the single year alternative.
    (§§ 31462, 31462.1, subd. (a)(2).) In either case, the retiring
    employee is entitled to designate the year or years to be used in
    calculating final compensation. (§§ 31462, 31462.1.)
    7
    CERL contains a few alternative definitions of
    compensation earnable applicable in specific circumstances.
    (See, e.g., §§ 31461.1, 31461.4, 31461.45 [all applicable only to
    Los Angeles County; see §§ 28020, 28022]; 31461.2 [applicable
    only to certain administrators and coroners].) We are concerned
    here only with the generally applicable definition, which is
    found in section 31461, subdivision (a).
    11
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    the monetary value of board, lodging, fuel, laundry, or other
    advantages furnished to a member.” (§ 31460.) Since the 1990s,
    CERL has provided that an employee’s contributions to a
    deferred compensation plan are included in compensation
    earnable in the year of the contribution, rather than the year in
    which the sums are withdrawn from the plan. (§§ 31460, 31461;
    see Ventura County, supra, 16 Cal.4th at p. 491.) Further,
    compensation earnable has long been held not to include
    overtime pay.      (See Guelfi v. Marin County Employees’
    Retirement Assn. (1983) 
    145 Cal.App.3d 297
    , 306–307 (Guelfi)
    [“overtime pay is not ‘compensation earnable’ and thus is not to
    be included in computing . . . ‘final compensation’ ”].) Since
    2000, overtime premium pay has been expressly excluded from
    compensation earnable in most circumstances by section
    31461.6. (Stats. 2000, ch. 966, § 3.)
    As our quotation from section 31461 suggests, CERL’s
    definition of compensation earnable is both very general and
    somewhat inscrutable. (See Ventura County, supra, 16 Cal.4th
    at p. 493 [sections 31460 and 31461 are “ambiguous in some
    respects”].) After an extensive examination of the language and
    legislative history, we held in Ventura County that
    “ ‘compensation earnable’ is the average pay of the individual
    retiring employee computed on the basis of the number of hours
    worked by other employees in the same class and pay rate —
    that is[,] the average monthly pay, excluding overtime, received
    by the retiring employee for the average number of days worked
    in a month by the other employees in the same job classification
    at the same base pay level.” (Id. at p. 504.) Accordingly, to
    calculate compensation earnable, section 31461 uses a retiring
    employee’s personal daily rate of pay, while it looks to the
    12
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    number of days “ordinarily” worked by comparable employees —
    that is, “persons in the same grade or class of positions during
    the period, and at the same [base] rate of pay” (id., subd. (a)) —
    to determine the number of workdays over which that rate of
    pay is applied. As a practical matter, a retiring employee’s final
    compensation is the annual compensation the employee would
    have received had he or she worked the average number of days
    ordinarily worked by his or her peers during the final
    compensation period. To find final compensation, a county
    retirement board is presumably required to determine the
    employee’s compensation during the final compensation period,
    divide that figure by the days worked by the employee in that
    time to determine his or her average daily rate of pay, and then
    multiply that rate by “the average [annual] number of days
    ordinarily worked” (ibid.) by the employee’s peers during the
    final compensation period.8
    Determining the components of an employee’s
    compensation that are included in compensation earnable has
    been a recurring issue in the implementation of CERL. The
    compensation of many county employees, particularly including
    public safety workers like the members of the Association,
    consists of a base salary augmented by a series of employee-
    8
    This is the manner in which at least one county retirement
    board does calculate final compensation. (See, e.g., Orange
    County Employees Retirement System Compensation Earnable
    Policy (Mar. 18, 2019), at p. 4 [using hours worked rather than
    days worked]  [as of July
    30, 2020]; all Internet citations in this opinion are archived by
    year,      docket     number,       and      case    name      at
    .)
    13
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    specific add-ons to recognize, for example, special training,
    experience, or hazardous duty. Prior to our decision in Ventura
    County, many county retirement boards were guided by Guelfi,
    supra, 
    145 Cal.App.3d 297
    , which held that compensation
    earnable does not include such add-ons unless they are paid to
    all of an employee’s peers. Guelfi also held that the value of in-
    kind advantages provided to an employee is excluded from
    compensation earnable, even if the employee is paid the cash
    value of the advantage rather than receiving it in-kind. (Id. at
    pp. 303–304.) Ventura County disapproved both of these aspects
    of Guelfi, holding that the statutory definition of “compensation”
    in section 31460 includes all cash compensation paid to an
    employee, regardless whether the cash represented the value of
    an in-kind benefit or constituted premium pay not received by
    all of the employee’s peers. (Ventura County, supra, 16 Cal.4th
    at pp. 496–499.) Because such “compensation” is the basis for
    compensation earnable, these general holdings from Ventura
    County have guided the determination of compensation
    earnable under CERL since the decision’s issuance in 1997.
    C. PEPRA
    The Legislature viewed PEPRA as a “comprehensive”
    reform of California’s public pension systems. (Sen. Rules Com.,
    Off. of Sen. Floor Analyses, Analysis of Assem. Bill No. 340
    (2011–2012 Reg. Sess.) Aug. 28, 2012, p. 8.) Many of PEPRA’s
    provisions were based on a reform proposal published by
    Governor Edmund G. Brown, Jr. in October 2011.9 Its
    9
    A copy of Governor Brown’s “Twelve Point Pension Reform
    Plan,” which is dated October 27, 2011, is posted on the
    14
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    centerpiece was a new pension plan applicable only to newly
    hired public employees that is “less expansive, and therefore
    less burdensome for the state and local governments, than the
    plans covering then-existing public employees.” (Cal Fire,
    
    supra,
     6 Cal.5th at pp. 974–975.) But PEPRA also modified
    some statutes governing the pensions of existing employees (Cal
    Fire, at p. 975) and incorporated provisions from separately
    pending legislation that were not a part of the governor’s
    proposal. One of those provisions was the amendment at issue
    in this matter.10
    California            government             website           at
     [as of July 30,
    2020].
    10
    As explained in a contemporary Senate bill analysis, “The
    comprehensive pension reform proposal . . . is based on the
    Governor’s 12-Point Pension Reform Plan. [¶] The Conference
    Committee Report includes 10 of the 12 points included in the
    Governor’s plan. . . . Additionally, in order to achieve the goal
    of comprehensive reform, included are some pension reform
    changes found in bills going through the Legislature this session
    that were not included as part of the Governor’s plan.” (Sen.
    Rules Com., Off. of Sen. Floor Analyses, Analysis of Assem. Bill
    No. 340 (2011-2012 Reg. Sess.) Aug. 28, 2012, pp. 7-8.) Rather
    than arising in the governor’s reform proposal, however, the
    provision of PEPRA under consideration here originated in an
    earlier version of Assembly Bill 340 and was retained
    throughout the legislative process. (Assem. Bill No. 340, Final
    Hist. (2011-2012 Reg. Sess.); see Assem. Bill No. 340, as
    amended April 25, 2011; Sen. Rules Com., Off. of Sen. Floor
    Analyses, Analysis of Assem. Bill No. 340 (2011-2012 Reg. Sess.)
    Aug. 28, 2012.)
    15
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    The present amendment, applicable to the pensions of
    both legacy and new employees, added a subdivision to the
    definition of compensation earnable in section 31461.11 (Stats.
    11
    In the text, we often refer to this provision of PEPRA as
    “the PEPRA amendment.”
    Subdivision (b) of section 31461, added by the PEPRA
    amendment, provides:
    “(b) ‘Compensation earnable’ does not include, in any case,
    the following:
    “(1) Any compensation determined by the board to have
    been paid to enhance a member’s retirement benefit under that
    system. That compensation may include:
    “(A) Compensation that had previously been provided in
    kind to the member by the employer or paid directly by the
    employer to a third party other than the retirement system for
    the benefit of the member, and which was converted to and
    received by the member in the form of a cash payment in the
    final average salary period.
    “(B) Any one-time or ad hoc payment made to a member,
    but not to all similarly situated members in the member’s grade
    or class.
    “(C) Any payment that is made solely due to the
    termination of the member’s employment, but is received by the
    member while employed, except those payments that do not
    exceed what is earned and payable in each 12-month period
    during the final average salary period regardless of when
    reported or paid.
    “(2) Payments for unused vacation, annual leave, personal
    leave, sick leave, or compensatory time off, however
    denominated, whether paid in a lump sum or otherwise, in an
    amount that exceeds that which may be earned and payable in
    each 12-month period during the final average salary period,
    regardless of when reported or paid.
    16
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    2012, ch. 296, § 28.) New subdivision (b) excludes entirely from
    compensation earnable two types of compensation and limits the
    amount of two other types of compensation that can be included
    in any 12-month period during the final compensation period.
    (§ 31461, subd. (b).)      As a result of the amendment,
    compensation earnable now excludes any compensation
    determined by the local retirement board to have been paid to
    enhance a member’s retirement benefit (id., subd. (b)(1)) and
    any compensation for services rendered outside normal working
    hours (id., subd. (b)(3)). In addition, compensation for the
    surrender of unused paid time off, such as vacation and sick
    leave, and payments made at termination of employment, which
    often also constitute compensation for unused leave time, can be
    included in compensation earnable only to the extent the leave
    time was “earned and payable” in any 12-month period during a
    final compensation year.12 (§ 31461, subd. (b)(2) & (b)(4).) Soon
    after PEPRA was adopted, related legislation added subdivision
    (c) to section 31461, which clarifies that the “terms of
    subdivision (b) are intended to be consistent with . . . the
    holdings in Salus v. San Diego County Employees Retirement
    “(3) Payments for additional services rendered outside of
    normal working hours, whether paid in a lump sum or
    otherwise.
    “(4) Payments made at the termination of employment,
    except those payments that do not exceed what is earned and
    payable in each 12-month period during the final average salary
    period, regardless of when reported or paid.”
    12
    The words “and payable” were added to section 31461,
    subdivision (b)(2) by a separate bill passed soon after PEPRA.
    The same bill added subdivision (c) to section 31461. (Stats.
    2012, ch. 297, § 2.)
    17
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Association (2004) 
    117 Cal.App.4th 734
     and In re Retirement
    Cases (2003) 
    110 Cal.App.4th 426
    .” (Stats. 2012, ch. 297, § 2.)
    A bill analysis prepared in connection with the pre-
    PEPRA version of Assembly Bill 340 explained that the purpose
    of these changes was to circumscribe CERL’s “very broad and
    general definition of ‘compensation earnable’ ” in order to reduce
    pension “ ‘spik[ing],’ ” the manipulation of an employee’s pattern
    of work and pay to produce inflated compensation earnable
    during the final compensation period. (Assem. Comm. on Public
    Employees, Retirement and Social Security, Analysis of Assem.
    Bill No. 340 (2011–2012 Reg. Sess.) Apr. 25, 2011, p. 3.)
    A review of the exclusions and limitations in PEPRA’s
    amendment of section 31461 demonstrates that the Legislature
    sought to limit pension spiking by eliminating practices that,
    while arguably permitted under the broad language of the
    preexisting definition, are inconsistent with the statute’s overall
    concept of compensation earnable. Subdivision (b)(1) excludes
    compensation found by a retirement board to have been “paid to
    enhance a member’s retirement benefit.”            In a properly
    operating employment setting, compensation received by
    employees is paid to compensate for their work; its enhancement
    of an employee’s pension benefit is merely a consequence, not an
    objective, of the compensation. In excluding compensation
    found by the retirement board to have been paid to enhance a
    pension benefit, the Legislature appears to have been concerned
    that some employees, presumably those in positions of unusual
    authority or influence, were able to manipulate county
    compensation practices to artificially increase their cash
    compensation during the final compensation period.
    Subdivision (b)(1) provides three examples of the types of
    18
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    compensation that could raise an inference of improper
    payment.13 Each contemplates a departure from ordinary
    practices: cash compensation in lieu of a benefit normally
    provided in-kind (§ 31461, subd. (b)(1)(A)), which would bring
    the value of an otherwise excluded in-kind benefit within the
    definition of compensation; a “one-time or ad hoc payment made
    to a member” but not to peers (id., subd. (b)(1)(B)); and a
    payment made “solely due to the termination of the member’s
    employment” but received while the employee is still employed
    (id., subd. (b)(1)(C)). Because payments made upon or after
    termination of employment have been held to be outside
    compensation earnable (see In re Retirement Cases (2003)
    
    110 Cal.App.4th 426
    , 473–476 (Retirement Cases)), this would
    also make pensionable a form of compensation otherwise
    excluded from compensation earnable.
    New subdivision (b)(3) of section 31461 excludes payments
    for “additional services rendered outside of normal working
    hours” from compensation earnable. An often-cited example of
    such compensation is on-call duty pay, which is provided to
    13
    The PEPRA amendment does not require exclusion solely
    because an item of compensation fits within one of these
    examples. Instead, they illustrate the type of practices that
    raise suspicion under section 31461, subdivision (b)(1). (Ibid.
    [“That compensation may include. . . .”].) Before it is excluded,
    an item of compensation described by subdivision (b)(1)(A)
    through (C) must be found by the county retirement board to
    have been “paid to enhance a member’s retirement benefit.”
    (§ 31461, subd. (b)(1).) Section 31542, subdivision (a), also
    added by PEPRA (Stats. 2012, ch. 296, § 29), requires each board
    to “establish a procedure for . . . determining whether an
    element of compensation was paid to enhance a member’s
    retirement benefit.”
    19
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    employees in return for voluntarily making themselves
    available to be called to work outside their normal working
    hours.     Because such pay is cash remuneration, it is
    “compensation” under section 31460. Yet because compensation
    earnable excludes overtime pay and is calculated on the basis of
    the days “ordinarily” worked by an employee’s peers (§ 31461,
    subd. (a)), the inclusion of payment for services provided outside
    normal hours in compensation earnable is arguably inconsistent
    with the statutory concept.
    As to new subdivision (b)(2) of section 31461, many
    counties permit employees to accumulate unused leave time,
    such as vacation days and sick leave, and to “cash out” the leave
    time at a later date by receiving the cash value of the time in
    return for its surrender. Such leave time is earned in the year
    in which it is awarded. Yet compensation for cashed out leave
    time becomes “compensation” for purposes of section 31460 in
    the year in which the cash value is received, which need not be
    the year in which the surrendered time was earned. This can
    lead to a distortion of the pension calculation when leave time
    awarded in a prior year is cashed out during the final
    compensation period, since this has the effect of adding
    remuneration for a prior year’s service to the compensation
    received for service during the final compensation period.
    A similar problem arises with payments made upon termination
    of employment, excluded by section 31461, subdivision (b)(4),
    because such payments are generally also compensation for the
    surrender of accrued leave time. By limiting the amount of
    “cash out” and termination pay that can be included in
    compensation earnable to the value of leave time “earned and
    payable in each 12-month period during the final average salary
    20
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    period” (ibid.), the Legislature appears to have intended to
    prevent retiring employees from, in effect, including
    remuneration earned during prior years in the final
    compensation calculation.
    The State points to an additional function of section 31461,
    subdivision (b)(2) and (4). Prior to PEPRA’s amendment, even
    in counties that limited the amount of leave time that could be
    cashed out in a calendar year, employees were able to double the
    amount of cashed out leave time received during a final
    compensation year by designating a final compensation year
    that straddles two calendar years, for example, July 1 through
    June 30. By cashing out leave time in the second half of the
    prior calendar year and the first half of the subsequent calendar
    year, a retiring employee could double the amount of cashed out
    leave time received in the final compensation year. By limiting
    the inclusion of cashed out leave time to that “earned and
    payable” in a “12-month period,” subdivision (b)(2) and (4)
    prevent this practice.
    We emphasize that there is nothing inherently abusive in
    the practices addressed by section 31461, subdivision (b)(2)
    through (4), at least when divorced from their pension
    consequences. Accepting voluntary on-call duty and cashing out
    unused leave time to the extent permitted by an employer are
    ordinary practices that serve proper public policy interests. Yet
    by not expressly excluding such payments when determining a
    county employee’s pension benefit, the pre-PEPRA definition of
    compensation earnable allowed an employee to considerably
    increase his or her pension benefit by volunteering for a large
    quantity of on-call duty or by accumulating and cashing out a
    large quantity of unused leave time during the final
    21
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    compensation period. Because such enhancements are arguably
    inconsistent with the underlying concept of compensation
    earnable, which is intended to reflect pay for work ordinarily
    performed during the course of a year, these types of
    enhancement have been characterized as pension spiking.
    D. This Litigation
    Following the enactment of PEPRA, the Association, the
    Merced County Sheriff’s Employees’ Association, and the Contra
    Costa County Deputy Sheriffs Association filed separate
    petitions for a writ of mandate against their respective county
    retirement boards.14 The three matters were eventually
    consolidated in a single proceeding in Alameda County.15 The
    fundamental contention of these lawsuits was that PEPRA’s
    exclusion of certain types of income from compensation earnable
    could not lawfully be applied to the calculation of the pensions
    of persons who were county employees at the time PEPRA
    became effective.
    14
    Various other entities and individual plaintiffs also joined
    as petitioners in these actions. In the course of the proceedings,
    additional parties were permitted to intervene or were joined as
    defendants, including the State, several public employers, such
    as the counties and county agencies like the District, and other
    public employee organizations.
    15
    A fourth, similar case from Marin County was ordered
    consolidated with these three, but that case was dismissed on
    demurrer prior to enforcement of the order of consolidation. The
    judgment in that action was affirmed in Marin Assn. of Public
    Employees v. Marin County Employees’ Retirement Assn. (2016)
    
    2 Cal.App.5th 674
     (Marin County). We granted review of Marin
    County (Nov. 22, 2016, S237460) but have deferred briefing.
    22
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    The litigation revealed that PEPRA’s amendment of
    section 31461 had caused the three county retirement boards to
    change certain policies governing the calculation of
    compensation earnable.       Although the exact pre-PEPRA
    practices varied among these counties, each retirement board
    maintained a policy permitting employees to include in
    compensation earnable at least some of the types of
    compensation that are excluded or limited by the PEPRA
    amendment. Most often this was compensation for cashed out
    leave time, which could be included in an amount exceeding that
    earned and payable in a single year, but on-call duty pay and
    some termination pay were also includable in one or more of the
    counties. (See Alameda County Deputy Sheriff’s Assn. v.
    Alameda County Employees’ Retirement Assn. (2018)
    
    19 Cal.App.5th 61
    , 82–83 (Alameda Sheriffs).)
    Further, the changes required by PEPRA were, in some
    cases, contrary to the terms of agreements entered into between
    the county retirement boards and county employees, as well as
    written policies adopted to reflect the terms of those
    agreements. This court’s decision in Ventura County, supra,
    
    16 Cal.4th 483
    , by disapproving much of Guelfi, supra,
    
    145 Cal.App.3d 297
    , called into question aspects of the then-
    prevailing approach to the calculation of compensation earnable
    under CERL. In the wake of Ventura County, county employees
    and their representatives filed lawsuits against many CERL
    retirement boards, including those in Alameda, Contra Costa,
    and Merced Counties, to address these issues. Each of these
    three lawsuits was resolved by a settlement agreement that, in
    part, required the respective retirement boards to include
    various types of compensation in the calculation of
    23
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    compensation earnable. Because these agreements were still in
    effect when PEPRA was enacted, compliance with its
    amendment of section 31461 led the boards to adopt policies that
    were, to some extent, inconsistent with the terms of the
    settlement agreements.          (Alameda Sheriffs, supra,
    19 Cal.App.5th at pp. 85–86.)
    The plaintiffs in the consolidated actions contended that
    county employees had both a vested right under the
    constitutional contract clause to the continued application of the
    policies in effect prior to PEPRA and, separately, a right under
    the settlement agreements, either directly or pursuant to the
    doctrine of equitable estoppel, to the continued application of the
    policies contained in them.16 After extensive litigation, the trial
    court entered a writ of mandate, ruling that county employees
    possess a vested right to the continuation of some, but not all, of
    the pre-existing practices.
    The Court of Appeal affirmed in part and reversed in part
    in Alameda Sheriffs, supra, 
    19 Cal.App.5th 61
    . The court
    concluded that subdivision (b)(1) and (3), added to section 31461
    16
    In their complaint, the plaintiffs cited the contract clauses
    of both the state and federal Constitutions as authority for their
    constitutional claims. In Cal Fire, we implicitly considered only
    California’s contract clause. (Cal. Const., art. I, § 9; Cal Fire,
    
    supra,
     6 Cal.5th at pp. 976, 977 & fn. 8 [plaintiffs’ claims
    pleaded under the California Constitution].) We take the same
    approach here, ruling solely on California’s unique approach to
    the contract clause in this context and discussing decisions
    under the United States Constitution only for their persuasive
    value in interpreting our own. Plaintiffs do not suggest that the
    federal Constitution provides greater protection for their
    pension rights than does the California Constitution.
    24
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    by PEPRA, changed the law governing CERL pensions by
    excluding types of compensation that were previously included
    in compensation earnable. (Alameda Sheriffs, at pp. 109–112.)
    Although recognizing that the constitutionality of these changes
    is governed by the Allen I test, the court declined to resolve the
    constitutional issue, concluding that it was “without sufficient
    information” about the implementation of CERL in the three
    counties. (Alameda Sheriffs, at p. 123.) At the same time, the
    court accepted the plaintiffs’ estoppel argument, ruling that the
    injustice resulting from a failure to give effect to the terms of the
    settlement agreements outweighed “ ‘any effect upon public
    interest or policy’ ” from failing to give effect to the terms of
    PEPRA. (Alameda Sheriffs, at p. 126.)
    We granted petitions for review filed by (1) the Association
    and the individual plaintiffs in its action, (2) the District, which
    had been joined as a defendant in the Contra Costa County
    action because it employs persons who participate in a CERL
    pension plan, and (3) the State, which had been permitted to
    intervene in the consolidated actions to defend the
    constitutionality of the legislation.
    II. DISCUSSION
    The issues raised here fall into two groups: first, whether
    the provisions of PEPRA’s amendment of CERL violated rights
    acquired by county employees by virtue of the settlement
    agreements entered into with the retirement boards, and,
    second, whether the amendment impaired county employees’
    constitutionally protected implied contractual rights in the
    implementation of CERL as it existed prior to the PEPRA
    amendment. Pursuant to traditional jurisprudential principles,
    we turn first to the nonconstitutional questions raised by the
    25
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    settlement agreements.       (See Santa Clara County Local
    Transportation Authority v. Guardino (1995) 
    11 Cal.4th 220
    ,
    230–231 [the court will not decide constitutional questions when
    other dispositive grounds are available].)
    A. The Retirement Boards’ Settlement Agreements
    Did Not Create a Contractual or Equitable
    Right to the Calculation of Pension Benefits
    That Supersedes the PEPRA Amendment
    Plaintiffs contend that county employees have the right to
    continue, after PEPRA, to have included in compensation
    earnable the items of compensation declared includable by the
    settlement agreements entered into by the retirement boards in
    the wake of Ventura County, despite the exclusion or limitation
    of these items by new subdivision (b)(2) through (4) of section
    31461.17 Plaintiffs contend that this right arises either directly,
    under the terms of the agreements, or by operation of the
    doctrine of equitable estoppel. We conclude that neither
    argument authorizes the county retirement boards to
    administer CERL in a manner inconsistent with the governing
    statutory provisions by including items of compensation in
    compensation earnable that section 31461, as amended,
    excludes.
    17
    The precise nature of the compensation at issue varies
    among the settlement agreements, which are not identical in
    their terms, but each agreement states that employees will be
    allowed to include in compensation earnable at least some of the
    types of compensation ruled out by PEPRA’s amendment of
    section 31461.
    26
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    1. Local retirement boards are required to comply
    with CERL in calculating county employee pension
    benefits
    An understanding of the proper role of county retirement
    boards under CERL is critical to resolving plaintiffs’ contract
    and estoppel claims. Under CERL, “management of the
    retirement system is vested” in the county retirement boards.
    (§ 31520.) This delegation of authority is echoed by article XVI
    of our Constitution, which grants to public employee retirement
    boards, including those operating under CERL, the “sole and
    exclusive responsibility to administer the system in a manner
    that will assure prompt delivery of benefits and related services
    to the participants and their beneficiaries.” (Cal. Const., art.
    XVI, §17, subd. (a); see Flethez v. San Bernardino County
    Employees Retirement Assn. (2017) 
    2 Cal.5th 630
    , 635–636
    [applying art. XVI to a county retirement system].) As a
    practical matter, the retirement boards’ responsibilities
    generally involve management of the system’s financial assets
    (Westly v. Board of Administration (2003) 
    105 Cal.App.4th 1095
    ,
    1109–1110 (Westly)) and the processing and payment of claims
    for benefits under the plan (see, e.g., McIntyre v. Santa Barbara
    County Employees’ Retirement System (2001) 
    91 Cal.App.4th 730
    , 734 [board has exclusive authority to determine whether
    plan is obligated to pay benefits to employee]; Masters v. San
    Bernardino County Employees Retirement Assn (1995)
    
    32 Cal.App.4th 30
    , 45 [board has exclusive authority to
    determine whether employee is permanently incapacitated and
    whether the disability is service-related]). In carrying out these
    responsibilities, the Constitution grants retirement boards
    “plenary authority and fiduciary responsibility for investment of
    moneys and administration of the system.” (Cal. Const., art.
    27
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    XVI, §17.) Of necessity, the task of processing claims for
    retirement benefits requires the county retirement boards to
    interpret and apply the provisions of CERL, including the
    sections defining compensation, compensation earnable, and
    final compensation.
    The task of a county retirement board is not to design the
    county’s pension plan but to implement the design enacted by
    the Legislature through CERL. As noted, CERL speaks of the
    retirement boards as “manag[ing]” the retirement system
    (§ 31520), while the Constitution charges them with
    “administer[ing]” the system and its assets (Cal. Const.,
    art. XVI, §17, subd. (a)). Although CERL grants to retirement
    boards the power to make regulations, those regulations must
    be consistent with the provisions of CERL. (§ 31525 [“The board
    may make regulations not inconsistent with this chapter”].) The
    boards do not have the authority to “evade the law” that
    otherwise applies to their system.                (Westly, supra,
    105 Cal.App.4th at p. 1100.) “The granting of retirement
    benefits is a legislative action within the exclusive jurisdiction
    of the [relevant legislative body]. . . . [¶] It is not within [a
    board’s] authority to expand pension benefits beyond those
    afforded by the authorizing legislation. . . . The scope of the
    board’s power as to benefits is limited to administering the
    benefits set by the [legislative body].” (City of San Diego v. San
    Diego     City     Employees’     Retirement      System    (2010)
    
    186 Cal.App.4th 69
    , 79–80; see similarly City of San Diego v.
    Haas (2012) 
    207 Cal.App.4th 472
    , 495.) This conclusion follows
    from principles governing the authority of administrative bodies
    generally: “[I]t is well established that the rulemaking power of
    an administrative agency does not permit the agency to exceed
    28
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    the scope of authority conferred on the agency by the
    Legislature. [Citation.] ‘A ministerial officer may not . . . under
    the guise of a rule or regulation vary or enlarge the terms of a
    legislative enactment or compel that to be done which lies
    without the scope of the statute . . . .’ [Citation.] And, a
    regulation which impairs the scope of a statute must be declared
    void.” (Agnew v. State Bd. of Equalization (1999) 
    21 Cal.4th 310
    ,
    321; see PaintCare v. Mortensen (2015) 
    233 Cal.App.4th 1292
    ,
    1305–1306 [“An administrative agency ‘has only as much
    rulemaking power as is invested in it by statute.’ [Citations.]
    Regulations that are inconsistent with a statute, alter or amend
    it, or enlarge or impair its scope are void”].)
    Accordingly, it is the Legislature that has final authority
    to establish the provisions governing the award of pension
    benefits under CERL. Further, it is the judiciary, not individual
    retirement boards, that has “final responsibility” for the
    interpretation of the Legislature’s terms. (Terhume v. Superior
    Court (1998) 
    65 Cal.App.4th 864
    , 873.) For that reason,
    although county retirement boards have the authority to
    interpret CERL’s provisions as necessary to perform their
    administrative functions, they have no authority to adopt or act
    on an interpretation that is inconsistent with those provisions.
    An administrative action that is unauthorized or inconsistent
    with governing legislation is invalid. (Terhume, at p. 873.)
    2. County retirement boards cannot confer a
    contractual right to the calculation of employee
    pension benefits in a manner inconsistent with
    CERL
    Plaintiffs argue that, by virtue of the settlement
    agreements, existing county employees have an express
    29
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    contractual right to the continued inclusion in compensation
    earnable of certain items otherwise excluded by PEPRA’s
    amendments. In order to find such a right, the settlement
    agreements must be interpreted to require that their
    classifications of compensation be applied in calculating the
    pensions of existing employees, regardless of subsequent
    statutory amendments or judicial decisions. The settlement
    agreements are silent on this issue. None of them contains a
    provision anticipating the possibility that CERL’s definition of
    “compensation earnable” could be legislatively amended in a
    manner inconsistent with their classifications or addressing the
    fate of those classifications in the event of legislative change or
    contrary judicial decision.
    It is a commonplace that “[a] contract must be lawful
    [citation], i.e., it must not be in conflict either with express
    statutes or public policy.” (Vierra v. Workers’ Comp. Appeals Bd.
    (2007) 
    154 Cal.App.4th 1142
    , 1148; see Civ. Code, § 1550.)
    California decisions have repeatedly recognized that this
    principle places constraints on the authority of public agencies
    to enter into agreements, since those agreements are unlawful
    if they exceed the agencies’ procedural and substantive powers.
    Procedurally, an agreement cannot be used to avoid legally
    prescribed procedures by dictating a result that, although
    within an agency’s power, can be achieved only by following
    those procedures. (E.g., City of San Diego v. California Water &
    Telephone Co. (1947) 
    30 Cal.2d 817
    , 823–824 [city agreement to
    abandon road held void because the statutory procedure for
    abandonment, requiring public hearings, is exclusive]; Trancas
    Property Owners Assn. v. City of Malibu (2006) 
    138 Cal.App.4th 172
    , 181–183 [city cannot, in litigation settlement agreement,
    30
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    avoid the requirement of a public hearing and findings by
    agreeing to the functional equivalent of a zoning variance].)
    Substantively, an agency cannot agree to a result that is
    otherwise beyond its power to achieve. (E.g., Summit Media
    LLC v. City of Los Angeles (2012) 
    211 Cal.App.4th 921
    , 936–937
    [city cannot agree to exempt party from otherwise applicable
    ordinances]; Midway Orchards v. County of Butte (1990)
    
    220 Cal.App.3d 765
    , 783 [city cannot by agreement approve a
    real estate development that is inconsistent with its general
    plan].) As a corollary of this principle, a public agency is
    prohibited from entering into an agreement that constrains the
    future exercise of its legislative or police powers. (Avco, supra,
    17 Cal.3d at p. 800; Summit Media, at p. 934–935.)
    As discussed above, the duty of a county retirement board
    is to administer CERL as enacted by the Legislature; the boards
    have no authority to act inconsistently with CERL. Accordingly,
    the county boards must comply with any changes to CERL
    enacted by the Legislature. They have no authority to disregard
    such amendments by continuing to pursue a practice that is
    contrary to CERL. As a consequence, any provision in the
    settlement agreements that would have required the retirement
    boards to continue to apply the agreed upon characterizations in
    the face of contrary legislative changes or authoritative judicial
    interpretations would have been void. The retirement boards
    had no authority to enter into an agreement that would require
    them to pursue a policy that conflicts with the governing
    legislation.
    Accordingly, the settlement agreements are best
    interpreted to require the retirement boards to implement their
    classifications of items of compensation only so long as those
    31
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    classifications are consistent with prevailing law. (See Civ.
    Code, § 1643 [“A contract must receive such an interpretation as
    will make it lawful”]; Edwards v. Arthur Andersen LLP (2008)
    
    44 Cal.4th 937
    , 953–954 [same]; Tiedje v. Aluminum Taper
    Milling Co. (1956) 
    46 Cal.2d 450
    , 453–454 [“A contract made . . .
    against the express mandate of a statute may not serve as the
    foundation of any action, either in law or in equity”].) To the
    extent any of the provisions of the settlement agreements are
    now in conflict with section 31461, the agreements must be
    interpreted to permit the retirement boards to modify their
    practices to conform to the governing statute. County employees
    acquired no express contractual right to have their retirement
    benefits calculated in a manner inconsistent with changes in
    CERL.
    Plaintiffs argue that the settlement agreements did not
    exceed the retirement boards’ power because the interpretations
    of CERL embodied in the settlement agreements were
    permissible under section 31461 as it existed at the time the
    agreements were executed. This argument is based, at least in
    part, on footnote 6 of Guelfi, supra, 145 Cal.App.3d at page 307.
    In this controversial footnote, the court interpreted section
    31461 merely to establish a minimum standard for the items
    that must be included in compensation earnable, while leaving
    individual retirement boards the discretion to include other
    items of compensation beyond this minimum. As Guelfi phrased
    it, “[n]othing in this opinion should be taken as barring either
    the inclusion of [pay premiums or] overtime in the calculation of
    benefits should the Board decide to do so . . . . Our conclusion is
    only that CERL does not require inclusion of those items of
    32
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    remuneration for retirees.”      (Guelfi, at p. 307, fn. 6, italics
    added.)
    Like the Court of Appeal, we reject this open-ended
    concept of compensation earnable, and we hereby disapprove of
    footnote 6 of Guelfi v. Marin County Employees’ Retirement
    Assn., supra, 145 Cal.App.3d at page 307. As the Court of
    Appeal correctly explained, compensation earnable under
    section 31461 has a specific statutory definition: It is an
    employee’s “average compensation . . . for the period under
    consideration,” adjusted for “the average number of days
    ordinarily worked by persons in the same grade or class of
    positions during the period. . . . ” (§ 31461, subd. (a); see
    Alameda Sheriffs, supra, 19 Cal.App.5th at pp. 94–95.) The
    term “compensation,” as used in section 31461, is similarly
    statutorily defined: It is an employee’s “remuneration paid in
    cash” and expressly excludes the “monetary value” of benefits
    paid in kind. (§ 31460.) Nothing in those definitions hints
    either that they are intended merely to establish a minimum,
    rather than to serve as a comprehensive definition, or that they
    may be implemented at the discretion of local retirement boards.
    There is no indication, for example, that a local board has the
    discretion to include the monetary value of in-kind benefits,
    which are expressly excluded by section 31461. Necessarily, the
    same is true of any other item of compensation that, even if not
    expressly mentioned as excluded, does not fall within the
    definitions. County retirement boards, as discussed above, have
    the ordinary authority of an administrative body to resolve, in
    the first instance, ambiguities in the interpretation and
    application of these statutes, but nothing in the text of sections
    31460 and 31461 hints that the discretion extends further. As
    33
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    the Court of Appeal pithily put it, “[a]n item of compensation is
    either includable in compensation, compensation earnable, and
    final compensation under the CERL statutes, or it is not.”
    (Alameda Sheriffs, at p. 96.)
    In any event, plaintiffs’ contention — that the
    determination of compensation earnable in the settlement
    agreements should be honored because they reflect
    interpretations that were lawful at the time — misses the point.
    We assume for purposes of this analysis that the settlement
    agreements embodied permissible interpretations of CERL at
    the time they were executed. The issue here is whether the
    retirement boards could have agreed to continue to implement
    those interpretations despite a statutory amendment that
    rendered the interpretations contrary to CERL. For the reasons
    discussed above, such a provision would have been beyond their
    authority. County employees can have no express contractual
    right to the continued adherence to interpretations of CERL
    that are now, as a result of PEPRA, contrary to the statute.18
    18
    Plaintiffs also argue that county employees acquired a
    contractual right to receive these benefits because their
    contributions to the county pension fund were based on an
    actuarial calculation that included the additional benefit costs
    attributable to the inclusion of items now excluded or limited by
    PEPRA. In plaintiffs’ view, county employees have, in effect,
    paid for the inclusion of the items excluded by PEPRA but
    permitted by the settlement agreements. Although this might
    entitle employees to a partial refund of their contributions, an
    issue we do not address, it does not create a contractual right to
    receive benefits in a manner inconsistent with CERL.
    (Cf. Retirement Cases, supra, 110 Cal.App.4th at pp. 453-454,
    469-472 [county employees have a right only to receive a pension
    34
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Finally, we note that plaintiffs repeatedly refer to the
    settlement agreements as judicially approved.           Judicial
    approval of the agreements does not alter our conclusion that
    they must be interpreted not to confer on the retirement boards
    the authority to pursue policies contrary to CERL. As noted
    above, our analysis assumes that the interpretations of CERL
    embodied in the settlement agreements were proper at the time
    they were approved. At most, the courts’ approval confirms this.
    The approving courts, however, rendered no opinion on the
    continued validity of those interpretations in the face of
    subsequent legislative amendments. Even if judicial approval
    of a settlement agreement could have conferred upon retirement
    boards the authority to violate a future amendment of CERL, a
    very doubtful proposition, there is no reason to conclude that
    these approvals should be understood as conferring such
    authority.
    Our ruling does not mean that county employees could not
    have acquired a constitutional right to the continued calculation
    of their pension benefits in the manner existing prior to PEPRA,
    a right that would be enforceable against subsequent,
    inconsistent amendments to CERL. In these circumstances,
    however, such a right could be created only by the
    preamendment provisions of CERL, as enforced by the
    constitutional contract clause — that is, created in the manner
    discussed in part II.B, post. Because the settlement agreements
    are properly interpreted not to require the boards to adhere to
    benefit as mandated by CERL, regardless of contributions;
    county retirement boards can collect contributions in arrears to
    compensate for increased pension benefits resulting from
    Ventura County’s interpretation of CERL].)
    35
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    contractual terms that become contrary to the governing
    statute, plaintiffs have no express contractual right to receive
    benefits calculated in a manner that is inconsistent with the
    PEPRA amendment.
    3. Plaintiffs have failed to demonstrate the
    prerequisites for invocation of the doctrine of
    equitable estoppel
    The Court of Appeal held that the Merced County
    retirement board is precluded from implementing new
    subdivision (b)(4) of section 31461, which limits the inclusion of
    termination pay in compensation earnable, by the doctrine of
    equitable estoppel.      The estoppel was premised on the
    settlement agreement entered into by that board following the
    issuance of Ventura County.          (Alameda Sheriffs, supra,
    19 Cal.App.5th at pp. 125–126.) Although the Court of Appeal
    invoked the doctrine only in connection with the Merced County
    agreement, its reasoning would extend more generally to any
    inconsistency between the settlement agreements and the terms
    of section 31461 and require the boards to adhere to the
    interpretation of CERL found in the settlement agreements,
    notwithstanding the changes introduced by the PEPRA
    amendment.19 Plaintiffs urge us to affirm the Court of Appeal
    19
    The ruling applied only to the Merced County retirement
    board because only its settlement agreement permitted the
    inclusion of termination pay. Because the Court of Appeal had
    already interpreted the PEPRA amendment not to limit the
    inclusion of compensation for cashed out leave time, the court
    found it unnecessary to consider application of the doctrine of
    estoppel to that type of compensation. (Alameda Sheriffs, supra,
    19 Cal.App.5th at p. 124.)
    36
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    on this ground and extend our ruling to any inconsistency
    between the settlement agreements and PEPRA.
    “ ‘The doctrine of equitable estoppel is founded on concepts
    of equity and fair dealing. It provides that a person may not
    deny the existence of a state of facts if he intentionally led
    another to believe a particular circumstance to be true and to
    rely upon such belief to his detriment. The elements of the
    doctrine are that (1) the party to be estopped must be apprised
    of the facts; (2) he must intend that his conduct shall be acted
    upon, or must so act that the party asserting the estoppel has a
    right to believe it was so intended; (3) the other party must be
    ignorant of the true state of facts; and (4) he must rely upon the
    conduct to his injury.’ ” (City of Goleta v. Superior Court (2006)
    
    40 Cal.4th 270
    , 279 (Goleta).) Although equitable estoppel is a
    well-accepted remedy among private parties, it has been applied
    sparingly when the party sought to be estopped is a
    governmental entity. “The government may be bound by an
    equitable estoppel in the same manner as a private party” (City
    of Long Beach v. Mansell (1970) 
    3 Cal.3d 462
    , 496–497, 501
    (Mansell)), but the doctrine is invoked only in “those ‘exceptional
    cases’ where ‘justice and right require’ ” (id. at p. 501) — that is,
    when “the injustice which would result from a failure to uphold
    an estoppel is of sufficient dimension to justify any effect upon
    public interest or policy which would result from the raising of
    an estoppel” (id. at pp. 496–497). In short, “[e]quitable estoppel
    ‘will not apply against a governmental body except in unusual
    instances when necessary to avoid grave injustice and when the
    result will not defeat a strong public policy.’ ” (Goleta, at p. 279.)
    We reject the Court of Appeal’s conclusion with respect to
    equitable estoppel because we find no actionable
    37
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    representations in the settlement agreements that would
    support invocation of that doctrine.         Equitable estoppel
    generally must be premised on some type of representation,
    ordinarily false, about a set of circumstances. (J.M. v.
    Huntington Beach Union High School Dist. (2017) 
    2 Cal.5th 648
    ,
    657 (J.M.) [“Equitable estoppel generally requires an
    affirmative representation or act by the public entity”];
    Simmons v. Ghaderi (2008) 
    44 Cal.4th 570
    , 584 [“A valid claim
    for equitable estoppel requires . . . a representation or
    concealment of material facts”].) The representations cited by
    the Court of Appeal were “the promise that [county employees]
    would receive a pension as authorized by CERL,” combined with
    “precise and explicit promises to [county employees] as to what
    such a statutorily authorized CERL pension would include,”
    which promises were found in “their court-approved Post-
    Ventura Settlement Agreements.” (Alameda Sheriffs, supra,
    19 Cal.App.5th at p. 128.) The cited representations are
    insufficient to support an estoppel in these circumstances.
    The core of plaintiffs’ estoppel claim is the second group of
    statements cited by the Court of Appeal, the boards’
    representations about the requirements of CERL, as contained
    in the settlement agreements.20 Necessarily, to the extent the
    20
    The first of these representations, that county employees
    would receive “a pension as authorized by CERL,” is plainly
    insufficient. Plaintiffs, in seeking an estoppel, are attempting
    to compel the county boards to award pension benefits in a
    manner inconsistent with CERL. It is defendants who advocate
    for application of the statute’s provisions. Ordinarily, a party
    will be estopped from “deny[ing] the existence of a state of facts
    . . . he intentionally led another to believe.” (Goleta, 
    supra,
    38
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    settlement agreements represent an interpretation of the
    statutory provisions of CERL, they reflect the statute as it
    existed at the time the settlement agreements were concluded,
    a decade prior to PEPRA. The settlement agreements contain
    no representations that can be construed as a guarantee that
    these provisions would not be amended. On the contrary, as
    discussed above, the agreements contain no provisions
    addressing the agreements’ implementation in the event of such
    an amendment. Further, all parties were presumably aware
    that CERL’s provisions, as enactments of the Legislature, could
    be changed by that same body, in which event the agreements’
    interpretations might no longer reflect the statute’s provisions.
    An agency’s representation about the contents of its governing
    statute at a particular point in time, standing alone, provides no
    basis for estopping the agency from conforming its practice to a
    statutory change that occurred subsequent to that
    representation.
    Application of the doctrine of estoppel requires, at a
    minimum, an actionable statement — that is, “an affirmative
    representation or act by the public entity” that is intended to
    induce reliance by the plaintiff. (J.M., supra, 2 Cal.5th at p. 657,
    italics omitted.)    An actionable representation in these
    circumstances would require, at a minimum, a statement
    indicating that the county boards would adhere to the
    interpretation of CERL found in the settlement agreements
    notwithstanding any change in the governing statute. In the
    40 Cal.4th at p. 279.) We know of no authority for estopping a
    party from denying the very opposite of its purportedly
    actionable representation.
    39
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    absence of such a representation, county employees had no
    reason to expect that the county boards would not conform their
    practice to any changes in their governing statute. The
    plaintiffs provided no evidence of such a statement. Instead, the
    county boards merely entered into agreements that embodied an
    interpretation of CERL as it existed at the time. They
    subsequently made statements suggesting that employee
    pensions in their county would be determined according to that
    interpretation. There is no indication that the boards went
    further, assuring employees that these interpretations were
    impervious to legislative change or, more pertinent, that the
    boards intended to adhere to the interpretations in the face of
    legislative change. In the absence of this type of representation,
    we find no basis for estopping the county boards from adjusting
    their policies in response to the PEPRA amendment, as they are
    required by law to do.21
    B. PEPRA’s Amendment of Section 31461 Did Not
    Violate the Rights of County Employees Under
    the Constitutional Contract Clause
    The terms of public employee pensions are protected by
    the constitutional contract clause. (Cal Fire, supra, 
    6 Cal.5th at
    21
    In reaching this conclusion, we do not mean to suggest
    that if such a representation had been made, this would,
    standing alone, justify imposing an estoppel on the county
    boards. There are, at a minimum, the further considerations of
    the board’s lack of legal authority to follow through on such a
    representation and the application of the overriding test for
    estoppel of a public agency, articulated in Mansell, supra,
    3 Cal.3d at pages 496-497, 501. We merely hold that plaintiffs
    have failed to demonstrate an actionable representation, the
    threshold requirement for invocation of the doctrine of equitable
    estoppel. (J.M., supra, 2 Cal.5th at p. 657.)
    40
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    p. 987; Legislature v. Eu (1991) 
    54 Cal.3d 492
    , 528 (Eu).)
    At issue here is whether PEPRA’s amendment of section 31461
    to exclude certain types of compensation from compensation
    earnable constitutes a substantial and unjustified impairment
    of county employees’ pension rights, the general standard
    required for a violation of the contract clause in these
    circumstances.     (Sonoma County Organization of Public
    Employees v. County of Sonoma (1979) 
    23 Cal.3d 296
    , 308–309
    (Sonoma Employees).) This is a question of law subject to our
    independent review. (Allen I, supra, 45 Cal.2d at p. 131.)
    1. Protection of public employee pensions under the
    contract clause
    a. Contract clause protections generally
    The vested rights doctrine, the foundation of plaintiffs’
    contention that PEPRA’s amendment of section 31461 is
    unconstitutional as applied to existing county employees, is
    grounded in the contract clause. (Cal. Const., art. I, § 9.) “Both
    the United States and California Constitutions contain
    provisions that prohibit the enactment of laws effecting a
    ‘substantial impairment’ of contracts, including contracts of
    employment.” (Cal Fire, 
    supra,
     6 Cal.5th at p. 977.) This
    constraint applies to public contracts, as well as those between
    private parties. (Ibid.) As suggested by the reference to a
    substantial impairment, not every legislative impairment of
    contractual relations triggers the contract clause.           (San
    Francisco Taxpayers Assn. v. Board of Supervisors (1992)
    
    2 Cal.4th 571
    , 583–584; Eu, 
    supra,
     54 Cal.3d at p. 528 [contract
    clause protects against “unreasonable” impairments].) “[T]he
    prohibition is not an absolute one and is not to be read with
    41
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    literal exactness like a mathematical formula.” (Home B. & L.
    Ass. v. Blaisdell (1933) 
    290 U.S. 398
    , 428 (Blaisdell).)
    In evaluating legislation that impairs private contractual
    rights, the United States Supreme Court applies what it
    characterizes as a “two-step test.” (Sveen v. Melin (2018) ___
    U.S. ___, ___ [
    138 S.Ct. 1815
    , 1821].) As a threshold question,
    the court must determine “ ‘whether the state law has, in fact,
    operated as a substantial impairment of a contractual
    relationship. [Citations.] The severity of the impairment is said
    to increase the level of scrutiny to which the legislation will be
    subjected.’ ” (Energy Reserves Group v. Kansas Power & Light
    (1983) 
    459 U.S. 400
    , 411 (Kansas Power).) In making this
    determination, “the Court has considered the extent to which
    the law undermines the contractual bargain, interferes with a
    party’s reasonable expectations, and prevents the party from
    safeguarding or reinstating his rights.” (Sveen, at p. ___ [138
    S.Ct. at p. 1822.) If the state law is found to create a
    “substantial” impairment, “the inquiry turns to the means and
    ends of the legislation.” (Ibid.) To justify the legislation, the
    state “must have a significant and legitimate public purpose
    behind the regulation, [citation], such as the remedying of a
    broad and general social or economic problem. . . . The
    requirement of a legitimate public purpose guarantees that the
    State is exercising its police power, rather than providing a
    benefit to special interests.” (Kansas Power, at pp. 411–412.) If
    the legislation survives that scrutiny, “the next inquiry is
    whether the adjustment of ‘the rights and responsibilities of
    contracting parties [is based] upon reasonable conditions and
    [is] of a character appropriate to the public purpose justifying
    [the legislation’s] adoption.’ ” (Id. at p. 412.)
    42
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    A different, more searching analysis occurs when the state
    legislates an impairment of its own contractual obligations
    because “the government’s self-interest is at stake.” (Sonoma
    Employees, 
    supra,
     23 Cal.3d at p. 308.) Although “ ‘courts
    properly defer to legislative judgment as to the necessity and
    reasonableness of a particular measure’ ” when “the State itself”
    is not “a contracting party” (Kansas Power, 
    supra,
     459 U.S. at
    pp. 413, 412), “complete deference to a legislative assessment of
    reasonableness and necessity is not required” when the state
    seeks to alter its own obligations. (Sonoma Employees, at
    p. 308.) In general terms, a state’s impairment of its own
    obligations “may be constitutional if it is reasonable and
    necessary to serve an important public purpose.” (United States
    Trust Co. v. New Jersey (1977) 
    431 U.S. 1
    , 25 (U.S. Trust).)
    Sonoma Employees addressed a contract clause challenge
    to state legislation that nullified every agreement between a
    local government and its employees providing for an annual cost
    of living wage increase greater than the cost of living increase
    given by the state to its own employees. The legislation had
    been passed in the wake of the electorate’s adoption of
    Proposition 13 in 1978, which the Legislature feared would
    bring a fiscal emergency to the state’s local governments. We
    invalidated the law as an unconstitutional impairment of the
    wage agreements, concluding that “respondents have clearly
    failed to satisfy their threshold burden of demonstrating that
    the substantial abridgement of petitioners’ contract rights to an
    increase in wages was warranted by a grave fiscal crisis, and
    they advance no other justification for the impairment.”
    (Sonoma Employees, at pp. 313–314.)
    43
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    In justification of the heightened degree of scrutiny
    applied when the state seeks to alter its own contractual
    obligations, we explained in Sonoma Employees, quoting U.S.
    Trust, 
    supra,
     431 U.S. at pages 1, 26, 29, 30–31, that “ ‘a
    governmental entity can always find a use for extra money . . . .
    If a State could reduce its financial obligations whenever it
    wanted to spend the money for what it regarded as an important
    public purpose, the Contract Clause would provide no protection
    at all . . . . [A] State cannot refuse to meet its legitimate
    financial obligations simply because it would prefer to spend the
    money to promote the public good rather than the private
    welfare of its creditors . . . . [A] State is not completely free to
    consider impairing the obligations of its own contracts on a par
    with other policy alternatives. Similarly, a State is not free to
    impose a drastic impairment when an evident and more
    moderate course would serve its purposes equally well.’ ”
    (Sonoma Employees, 
    supra,
     23 Cal.3d at p. 308.)
    b. Contract clause protection of public employee
    pension rights in California
    As we discussed in Cal Fire, a public employee has no
    express contractual rights in a pension plan created by statute,
    like CERL. (Cal Fire, 
    supra,
     6 Cal.5th at pp. 977–978, 984–985.)
    Nonetheless, we have recognized, at least since Kern v. City of
    Long Beach (1947) 
    29 Cal.2d 848
     (Kern), that such plans create
    implied contractual rights that are protected against legislative
    impairment by the contract clause. (Cal Fire, at pp. 984–985.)
    The parties agree that the provisions of CERL, although
    statutory, are protected by the contract clause. (But see fn. 29,
    post.)
    44
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    With respect to that constitutional protection, our
    decisions have established a standard specifically tailored to the
    unique circumstances presented by public employee pension
    reform. A modification of the pension rights accorded to a public
    employee at the time he or she commenced public employment,
    or of pension rights made available subsequently during the
    course of his or her public career, will be upheld against a
    contract clause challenge only if it satisfies the test established
    in Allen I: “An employee’s vested contractual pension rights
    may be modified prior to retirement for the purpose of keeping
    a pension system flexible to permit adjustments in accord with
    changing conditions and at the same time maintain the integrity
    of the system. [Citations.] Such modifications must be
    reasonable . . . . To be sustained as reasonable, alterations of
    employees’ pension rights must bear some material relation to
    the theory of a pension system and its successful operation, and
    changes in a pension plan which result in disadvantage to
    employees should be accompanied by comparable new
    advantages.” (Allen I, supra, 45 Cal.2d at p. 131; see also Betts
    v. Board of Administration (1978) 
    21 Cal.3d 859
    , 866 (Betts)
    [contract clause protects not only pension rights available at
    commencement of employment but also those “which are
    thereafter conferred during the employee’s subsequent
    tenure”].) This quotation from Allen I is the foundation of the
    California Rule. By analogy to the federal standard, it defines
    when a modification of public employee pension rights will
    survive contract clause scrutiny as “reasonable and necessary to
    serve an important public purpose.” (U.S. Trust, supra, 431
    U.S. at p. 25.)
    45
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    A review of the rule’s historical development will help to
    explain its requirements. As we first recognized over a century
    ago in O’Dea v. Cook (1917) 
    176 Cal. 659
    , when a public
    employee renders service under a pension statute “the pension
    provisions become a part of the contemplated compensation for
    those services and so in a sense a part of the contract of
    employment itself.” (Id. at pp. 661–662; see Cal Fire, 
    supra,
    6 Cal.5th at p. 984.)       In squaring this insight with the
    traditional rule that statutes do not create contractual rights,
    our subsequent decision in Kern held that “public employment
    gives rise to certain obligations which are protected by the
    contract clause of the Constitution, including the right to the
    payment of salary which has been earned. Since a pension right
    is ‘an integral portion of contemplated compensation’ [citation],
    it cannot be destroyed, once it has vested, without impairing a
    contractual obligation.” (Kern, supra, 29 Cal.2d at pp. 853.) It
    is the nature of pension rights as deferred compensation that
    caused Kern to hold them protected under the contract clause.
    (Cal Fire, at pp. 984–985.)
    In and after Kern, we have attempted to define the
    constitutionally appropriate balance between preserving public
    employee pension rights and granting the Legislature the
    flexibility necessary to cope with changing circumstances. In
    Kern, the defendant city had terminated its safety officer
    pension plan, providing no replacement, mere days before the
    plaintiff officer completed the 20 years of service necessary to
    qualify for a pension. (Kern, supra, 29 Cal.2d at p. 850.) We had
    no difficulty finding that the wholesale elimination of previously
    available pension benefits works a substantial impairment of an
    employee’s implied contractual rights. (Id. at p. 853 [although
    46
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    pension statutes can be modified, “it does not follow that an
    employee may be deprived of all pension benefits by a repeal of
    the statute without the enactment of a substitute”].) As we
    concluded, allowing a last minute repeal of pension rights
    “would defeat one of the primary objectives in providing
    pensions for government employees, which is to induce
    competent persons to enter and remain in public employment,”
    because “the promise of a pension annuity would either become
    ineffective as an inducement to public employees or it would
    become merely a snare and a delusion to the unwary.” (Id. at
    p. 856.)
    Given the complete elimination of the plaintiff’s pension
    plan in Kern, we recognized that “[t]he permissible scope of
    changes in the provisions [of a public pension plan] need not be
    considered here . . . .” (Kern, supra, 29 Cal.2d at p. 855.) Yet we
    made observations that subsequently influenced the resolution
    of this issue. Kern acknowledged that “[t]he rule permitting
    modification of pensions is a necessary one since pension
    systems must be kept flexible to permit adjustments in accord
    with changing conditions and at the same time maintain the
    integrity of the system and carry out its beneficent policy.” (Id.
    at pp. 854–855.) Because of that necessity, we concluded, “[A]n
    employee may acquire a vested contractual right to a pension
    but . . . this right is not rigidly fixed by the specific terms of the
    legislation in effect during any particular period in which he
    serves. The statutory language is subject to the implied
    qualification that the governing body may make modifications
    and changes in the system. The employee does not have a right
    to any fixed or definite benefits, but only to a substantial or
    reasonable pension. There is no inconsistency therefore in
    47
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    holding that he has a vested right to a pension but that the
    amount, terms and conditions of the benefits may be altered.”
    (Id. at p. 855.)
    The question of the permissible scope of pension plan
    modifications came before the court again in Packer v. Board of
    Retirement (1950) 
    35 Cal.2d 212
     (Packer). The plaintiff in
    Packer was the widow of a Los Angeles County peace officer who
    died a few years after retiring. Four years before the deceased’s
    retirement, as part of a larger pension reform, the applicable
    pension ordinance was amended to grant benefits to an officer’s
    surviving spouse only if the officer accepted a lesser retirement
    benefit. Previously, such surviving-spouse benefits had been
    available as a matter of course to all officers. Because the
    plaintiff’s husband did not elect the lower benefit alternative,
    the retirement board found that she was not entitled to benefits
    upon his death. (Id. at pp. 213–214.)
    In addressing the constitutional propriety of the
    modification of the surviving spouse provisions, Packer first
    acknowledged Kern’s ruling that some pension modification is
    permitted to allow state and local governments the flexibility to
    cope “ ‘with changing conditions and at the same time maintain
    the integrity of the system.’ ” (Packer, supra, 35 Cal.2d at
    p. 214.) With respect to the particular modification at issue in
    Packer, we noted that “under certain circumstances” the larger
    reform of which the challenged provision was a part “would give
    county peace officers and their families greater benefits than
    they had before.” (Id. at p. 218.) Pensions continued to be paid
    to the surviving spouses of officers who died from service-related
    causes, for example, and these were doubled in amount by the
    pension reform. Other basic terms and conditions of retirement
    48
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    were unchanged. In addition, of course, the amended statute
    continued to make available a general surviving spouse benefit
    to retirees, albeit on condition of their accepting a lesser benefit
    during their own life. (Id. at pp. 218–219.) Taking the changes
    as a whole, we concluded, it was “difficult, if not impossible,” to
    determine whether the “total value” of an officer’s pension rights
    had been diminished by the amendments. (Id. at p. 219.)
    Because “[i]t is reasonably clear . . . that the employees,
    including [the plaintiffs’ decedent], retained rights to
    substantial pension benefits,” we held that the amendment “did
    not exceed the scope of a permissible modification.” (Id. at
    p. 219.)
    Soon after, we again confronted the issue in Wallace v.
    City of Fresno (1954) 
    42 Cal.2d 180
     (Wallace). The plaintiff, a
    former police chief who retired in 1949, was stripped of his
    pension benefits after a postretirement conviction for tax fraud.
    (Id. at pp. 181–182.) The city had enacted its pension plan for
    peace officers in 1923, early in the plaintiff’s career. The initial
    plan had no provision for depriving a retiree of benefits, but in
    1927 the governing ordinance was amended to require the
    termination of the pension benefits of a retiree who was
    convicted of a felony or a crime of moral turpitude. (Id. at
    p. 182.) Although Wallace assumed that the felony conviction
    provision would have been enforceable if contained in the
    original pension ordinance, we held that its application to the
    plaintiff triggered the contract clause because its adoption
    during his employment constituted a modification of the terms
    of his pension plan. As we framed the question, we were
    required to “determine whether the changes made come within
    the bounds of a reasonable modification or whether their effect
    49
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    is to impair his vested contractual rights.” (Wallace, at pp. 183–
    184.) We again recognized that modification of a pension plan
    is permitted to cope with changing times, but we balanced this
    principle against “the facts that pension payments are deferred
    compensation to which a pensioner becomes entitled upon
    performing all services required under the contract and that his
    retirement because of age ordinarily shows that he has done
    everything necessary to entitle him to payment of the pension.”
    (Id. at pp. 184–185.) We concluded that the amendment was not
    a reasonable modification. As we explained, “[t]he termination
    of all pension rights upon conviction of a felony after retirement
    does not appear to have any material relation to the theory of
    the pension system or to its successful operation. Rather, the
    change was designed to benefit the city and, as stated in the
    city’s brief, to meet the objections of taxpayers who would be
    opposed to contributing funds for the maintenance of a
    pensioner who had been convicted of a felony.” (Id. at p. 185.)
    The foregoing three decisions were synthesized in Allen I,
    supra, 
    45 Cal.2d 128
    , which articulated the standard for
    contract clause protection of public employee pension benefits
    that persists to this day. Allen I was the second chapter of the
    story introduced in Kern, which addressed the elimination in
    1945 of the public safety officer pension system of the City of
    Long Beach. Presumably as a result of the ruling in Kern, the
    city restored the pension plan for officers hired prior to its
    elimination. Subsequently hired officers, however, worked
    without a pension plan until 1950, when the city entered them
    in the state pension system. (Allen I, at p. 130.) The following
    year, the city amended the original pension plan applicable to
    the officers hired before 1945 in three ways: (1) employee
    50
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    pension contributions were increased fivefold, from two percent
    of salary to ten percent; (2) the city switched from a fluctuating
    pension benefit, which was pegged to the salary paid to current
    employees in the retiree’s final job position, to a fixed benefit,
    which was determined by the retiree’s own late career salary;
    and (3) employees who were granted pension plan service credit
    for a leave of absence for military service were, for the first time,
    required to make contributions to the plan in return for the
    service credit. (Id. at pp. 130–131.) The affected officers
    challenged each of these changes as a violation of the contract
    clause.
    Citing Wallace, Packer, and Kern, we acknowledged that
    vested pension rights may be modified “for the purpose of
    keeping a pension system flexible to permit adjustments in
    accord with changing conditions and at the same time maintain
    the integrity of the system.” (Allen I, supra, 45 Cal.2d at p. 131.)
    More specifically, we held, “Such modifications must be
    reasonable, and it is for the courts to determine upon the facts
    of each case what constitutes a permissible change. To be
    sustained as reasonable, alterations of employees’ pension
    rights must bear some material relation to the theory of a
    pension system and its successful operation, and changes in a
    pension plan which result in disadvantage to employees should
    be accompanied by comparable new advantages.” (Ibid.)
    Applying this rule, we rejected all three of the modifications,
    concluding that the plan amendment “substantially decreases
    plaintiffs’ pension rights without offering any commensurate
    advantages, and there is no evidence or claim that the changes
    enacted bear any material relation to the integrity or successful
    operation of the [preexisting] pension system . . . .” (Ibid.)
    51
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Our reasoning in rejecting the individual modifications
    gave substance to the rule’s requirements. We began with a
    consideration of the disadvantages and comparable new
    advantages. Our discussion of the increase in the contribution
    rate was short and pointed: “The provision . . . obviously
    constitutes a substantial increase in the cost of pension
    protection to the employee without any corresponding increase
    in the amount of the benefit payments he will be entitled to
    receive upon his retirement.” (Allen I, supra, 45 Cal.2d at
    p. 131.) Our consideration of the switch to a fixed pension
    benefit was more deliberate. As we pointed out, a fixed pension
    benefit is unresponsive to changing economic conditions. In
    contrast, tying the amount of the benefit to a current employee’s
    salary permits retirees to “maintain a fairly constant standard
    of living despite changes in our economy,” since it is assumed
    that current salaries will reflect those changes. (Id. at p. 132.)
    Particularly because the post-war period was “an era of rising
    salaries and high cost of living,” we concluded that “plaintiffs’
    rights would be adversely affected by the change to the fixed
    benefit plan.” (Ibid.) Our rationale for questioning the newly
    required contributions in return for credit for military service
    was similar to that of the increased ordinary contributions. “The
    provision . . . imposes a considerable financial burden upon
    those who, while in the armed forces, earn less than they would
    earn as city employees, and it raises the cost to them of pension
    protection without securing any advantage in addition to that
    which they already enjoyed.” (Id. at p. 133.)
    After concluding that each of the changes was, for the
    reasons stated, disadvantageous to pre-1945 hires, we
    addressed the purpose of the changes. Allen I first noted that
    52
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    the changes were not adopted out of concern for the financial
    stability of the pension system. “The city does not claim that
    any of the provisions contained in [the amendment] was
    necessary to preserve or protect the pension program applicable
    to [pre-1945 hires], and there is no indication that the city would
    have difficulty in meeting its obligations to those employees
    under the provisions of [the original pension plan].” (Allen I,
    supra, 45 Cal.2d at p. 133.) Instead, we observed, the city
    explained that “the changes . . . were enacted in order to make
    the pension system for [pre-1945 hires] more nearly coincide
    with the retirement system established . . . for policemen and
    firemen employed after that date, thus to ameliorate ‘personal
    [sic] problems’ assertedly created by differences in pension costs
    and benefits to the two groups of employees and to ‘somewhat
    equalize the compensation provided for employees who perform
    like services.’ ” (Ibid.)
    We concluded that this rationale was insufficient to justify
    the impairment of pension benefits caused by the various
    changes. As we explained, “[s]uch purposes, however beneficial
    to the city, bear no relation to the functioning and integrity of
    the pension system established for persons employed prior to
    [1945] and constitute no justification for materially reducing the
    vested contractual rights earned by plaintiffs prior to the time
    [the charter amendment] was adopted.” (Allen I, supra,
    45 Cal.2d at p. 133.)
    In sum, when evaluating modifications to a public
    employee pension plan under the contract clause, Allen I
    requires a court first to determine whether the modifications
    impose an economic disadvantage on affected employees and, if
    so, whether those disadvantages are offset in some manner by
    53
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    comparable new advantages.22 The court must then determine
    whether the government’s articulated purpose in making the
    changes was sufficient, for constitutional purposes, to justify
    any impairment of pension rights. Although changes may be
    enacted “for the purpose of keeping [the] pension system flexible
    to permit adjustments in accord with changing conditions and
    at the same time maintain the integrity of the system,” such
    changes “must bear some material relation to the theory of a
    pension system and its successful operation.” (Allen I, supra,
    45 Cal.2d at p. 131.)
    In the intervening 65 years, our decisions have clarified
    aspects of the Allen I test, but its substance is unchanged.23 In
    22
    Neither Allen I nor any of our subsequent pension
    decisions have addressed a situation in which all economic
    disadvantages of a pension modification were offset by
    comparable new advantages. Such an argument was made in
    Betts, supra, 21 Cal.3d at pages 864-865, but we found it
    inapplicable in the circumstances presented. (Id. at p. 867.) In
    Packer, which predated Allen I, we held that the contract clause
    was not violated upon finding that it was “difficult, if not
    impossible,” to determine whether the “total value” of an
    officer’s pension rights had been diminished by the challenged
    amendments. (Packer, supra, 35 Cal.2d at p. 219.) Packer can
    therefore be interpreted as holding that no contract clause
    violation results when a pension plan modification provides
    fully compensating new advantages. We note, however, that the
    determination of disadvantages and comparable advantages
    was made collectively in Packer, rather than as to individual
    employees. (See Packer, at p. 218.) This collective approach was
    effectively disavowed in Abbott v. City of Los Angeles (1958)
    
    50 Cal.2d 438
    , 449 (Abbott).
    23
    Plaintiffs argue that, in Olson v. Cory (1980) 
    27 Cal.3d 532
    , we held that a modification of pension rights is “per se
    54
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Abbott, supra, 
    50 Cal.2d 438
    , we employed the rationale
    articulated in Allen I in concluding that the change from a
    fluctuating to a fixed pension benefit could not properly be
    applied to persons who were employed by the defendant city at
    the time the change occurred, even though the change had
    occurred 35 years earlier. (Abbott, at pp. 453–455.) In the
    process, we explained that the determination of disadvantages
    and comparable new advantages must be made individually as
    to each affected employee, rather than on the basis of the
    employees as a group. (Id. at p. 449; see similarly Betts, supra,
    21 Cal.3d at p. 864.)
    In analyzing a similar constitutional issue in Betts, supra,
    
    21 Cal.3d 859
    , we entertained the argument that, as a general
    matter, the change from a fluctuating benefit to a fixed benefit
    adjusted annually for inflation could pass constitutional muster
    because such a change represented the replacement of “one ‘cost
    of living’ formula” for another. (Id. at p. 865.) We found it
    unnecessary to rule on that argument, however, because the
    Legislature had adopted the cost of living adjustment at a time
    when pension benefits were still determined by the fluctuating
    unreasonable” if it is permanent, rather than temporary. Olson
    rendered no such holding. At the point in the decision cited by
    plaintiffs, Olson merely summarized four factors considered by
    the Supreme Court in Blaisdell, supra, 
    290 U.S. 398
    , in deciding
    whether a particular impairment of private contracts was
    unconstitutional. One of these was whether the impairment
    was permanent or temporary. Contrary to plaintiffs’ claim of
    “per se” unreasonableness, none of the factors was characterized
    as determinative on its own. (See Olson at p. 539; Blaisdell, at
    p. 441.) Neither Olson nor any other decision of this court has
    held that an impairment of contracts is unconstitutional solely
    because it is permanent, rather than temporary.
    55
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    method. The change to a fixed benefit did not come until several
    years later. Accordingly, we held, the plaintiff had a vested
    right to both a fluctuating pension benefit and the cost of living
    adjustment,      since    those   advantages     were     offered
    simultaneously by the pension plan during his public service.
    (Id. at p. 866 [“An employee’s contractual pension expectations
    are measured by benefits which are in effect not only when
    employment commences, but which are thereafter conferred
    during the employee’s subsequent tenure”].)
    Thereafter, in International Assn. of Firefighters v. City of
    San Diego (1983) 
    34 Cal.3d 292
     (Firefighters), our court made
    explicit what was already implicit in the vested rights doctrine,
    namely, that the contract clause does not protect public
    employees against adverse changes in the manner in which a
    pension plan is implemented that are authorized by the existing
    terms of the plan, rather than as a result of legislative changes
    to those terms. (Id. at pp. 301–302 [holding that an increase in
    employee contribution rates pursuant to the existing terms of a
    pension plan does not violate vested rights].)
    Although we have addressed pension-related contract
    clause issues in a few other decisions rendered in the years since
    Betts, these decisions applied the principles established in
    Allen I, Abbott, and Betts without changing their substance.
    (E.g., City of Huntington Beach v. Board of Administration
    (1992) 
    4 Cal.4th 462
    , 471–472 (Huntington Beach); Eu, 
    supra,
    54 Cal.3d at p. 529; Allen v. Board of Administration (1983)
    
    34 Cal.3d 114
     (Allen II).) Our last decision to touch on these
    issues, issued over 25 years ago, continued to cite the test
    established in Allen I. (Huntington Beach, at p. 472.)
    56
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Although it did not otherwise augment our contract clause
    jurisprudence, Allen II has caused some confusion. When
    summarizing the test applied to pension plan modifications
    under the contract clause, the decision stated that when such a
    change results in disadvantages to employees, it “must” be
    accompanied by comparable new advantages. (Allen II, supra,
    34 Cal.3d at p. 120.) This differed from the formulation in Allen
    I, which held that disadvantages “should” be accompanied by
    new advantages. (Allen I, supra, 45 Cal.2d at p. 131.) Based on
    this inconsistency, the Court of Appeal in the decision under
    review concluded that “the Supreme Court changed the
    formulation of its reasonableness test” in Allen II. (Alameda
    Sheriffs, supra, 19 Cal.App.5th at p. 120.) Although the court’s
    conclusion is understandable, we conclude that Allen II did not
    modify the rule of Allen I. Other than its isolated use of the word
    “must,” there is no reason to believe that Allen II intended a
    modification. The two Supreme Court cases Allen II cited as its
    source for the test, Allen I and Abbott, both use the word
    “should.” Allen II did not indicate an intent to change the
    governing standard, let alone attempt to justify it, as would
    ordinarily occur if we intended to effect a material change in the
    law, and the distinction between “must” and “should” played no
    role in the resolution of Allen II. Further, our subsequent
    decisions have never recognized a change in the test. All of our
    later decisions mentioning this standard use the word “should,”
    including a decision issued only one month after Allen II and
    authored by the same justice. (Firefighters, supra, 34 Cal.3d at
    p. 301; see also Huntington Beach, 
    supra,
     4 Cal.4th at p. 472;
    Eu, 
    supra,
     54 Cal.3d at pp. 529–530.) A different division of the
    First District Court of Appeal examined the same question in
    57
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Marin County and, after a careful analysis, concluded that
    “ ‘[s]hould,’ not ‘must,’ remains the court’s preferred expression.”
    (Marin County, supra, 2 Cal.App.5th at p. 699, review granted;
    see similarly, Hipsher v. Los Angeles County Employees
    Retirement Assn (2018) 
    24 Cal.App.5th 740
    , 753, review granted
    Sept. 12, 2018, S250244 [use of “must” in Allen II not to be taken
    literally].) The one-time use of “must” in Allen II appears to
    have been inadvertent, and it should not be understood to have
    changed the Allen I standard.
    2. PEPRA’s amendment of section 31461 constituted a
    modification of CERL
    As the Court of Appeal recognized, a legislative action
    cannot be found to have impaired public employee pension
    rights unless the action constituted a modification of the pension
    system. (Alameda Sheriffs, supra, 19 Cal.App.5th at p. 96
    [“whether the changes to section 31461 . . . unconstitutionally
    impair the vested pension rights . . . depends, at least as an
    initial matter, on whether those changes actually modified
    CERL”].) Changes in the implementation of a pension plan that
    occur pursuant to its existing terms and conditions, for example,
    do not support a claim of impairment. (Firefighters, supra,
    34 Cal.3d at pp. 301–302 [increase in employee contribution
    rates pursuant to the provisions of a pension plan does not
    violate the contract clause].) A change in the language of a
    statute or ordinance governing a pension plan that does not
    change the manner in which it is implemented similarly does
    not support a claim of impairment. (Gatewood v. Board of
    Retirement (1985) 
    175 Cal.App.3d 311
    , 319 (Gatewood)
    [statutory amendment that was consistent with existing judicial
    interpretation did not give rise to contract clause claim].)
    58
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Legislation amending unambiguous statutory language or
    effectively overruling a settled judicial interpretation of
    statutory language, however, undoubtedly constitutes a
    constitutionally cognizable modification of employee pension
    rights, assuming the legislation materially changed the manner
    in which the pension system is implemented. We conclude that
    the amendment of section 31461 to add subdivision (b)(1)
    through (3) constituted a change in the law because those
    provisions narrowed the expansive interpretation of
    compensation earnable adopted in Ventura County.24
    24
    When it is unclear whether the legislation actually effects
    a change in the governing law — that is, when neither the
    preexisting language of the statute nor a judicial decision
    resolves the issue addressed by the legislation — it cannot be
    said with equal confidence that the legislation impairs existing
    pension rights. The State and the District argue that an
    amendment of ambiguous statutory language governing pension
    rights does not constitute a modification for purposes of the
    contract clause, so long as the amendment qualifies as a
    clarification of the statute. (See Protect our Benefits v. City and
    County of San Francisco (2015) 
    235 Cal.App.4th 619
    , 636-637
    [considering whether a contract clause claim should be denied
    because a change in the governing ordinance was a clarification
    of an earlier ordinance]; In re J.C. (2016) 
    246 Cal.App.4th 1462
    ,
    1479-1480 [in determining the retroactivity of a statutory
    amendment, an amendment that adopts a reasonable
    interpretation of a previously ambiguous statute is regarded as
    clarifying, rather than changing, the law].) Given the very
    general language of section 31461, defendants argue that
    PEPRA’s amendments should be viewed as clarifying, rather
    than changing, the definition of compensation earnable. In light
    of our conclusion, explained hereafter, that the PEPRA
    amendment of section 31461 is properly considered a change of
    the interpretation of section 31461 rendered in Ventura County
    59
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    a. Ventura County adopted a broadly inclusive
    definition of “compensation earnable”
    Our sole decision addressing the scope of “compensation
    earnable” is Ventura County, supra, 
    16 Cal.4th 483
    , in which we
    considered whether “various payments by the county over and
    above the basic salary paid to all employees in the same job
    classification are ‘compensation’ within the meaning of the
    [CERL] statute” (id. at p. 487) and clarified the meaning of
    compensation earnable under section 31461. We began by
    recognizing that the statutory terms “compensation” and
    “compensation earnable” are “ambiguous in some respects” and
    fail clearly to resolve the status of items of compensation beyond
    basic salary or wages. (Ventura County, at p. 493.) Regarding
    the first issue, the status of payments over and above base
    salary, we began with the statutory definition of compensation
    as “remuneration paid in cash . . . , but [not] the monetary value
    of board, lodging, fuel, laundry, or other advantages furnished
    to a member.” (§ 31460; see Ventura County, at pp. 490–491.)
    Accepting the implications of a literal reading of this language,
    we held that the term includes all compensation paid in cash,
    while excluding any benefits conferred in a form other than
    cash. (Ventura County, at p. 497.) We applied this ruling to hold
    that a wide variety of cash payments that supplement an
    employee’s base pay are included in “compensation,” including
    uniform allowances, cashed-out leave time, bilingual premium
    rather than a clarification of the statutory language, it is
    unnecessary for us to decide whether the Legislature’s
    clarification of ambiguous statutory language would avoid
    contract clause scrutiny.
    60
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    pay, pay for field training officer and motorcycle duty, holiday
    pay, and educational incentive pay. (Id. at pp. 497–498.)
    Having settled the issue of compensation, we turned to the
    meaning of compensation earnable, which bore the definition
    now found in section 31461, subdivision (a). (Ventura County,
    supra, 16 Cal.4th at p. 499.) As discussed above, we ruled that
    “ ‘compensation earnable’ is the average pay of the individual
    retiring employee computed on the basis of the number of hours
    worked by other employees in the same class and pay rate —
    that is[,] the average monthly pay, excluding overtime, received
    by the retiring employee for the average number of days worked
    in a month by the other employees in the same job classification
    at the same base pay level.” (Id. at p. 504.) In reaching that
    conclusion, we relied in part on the similar language that was
    at one time used to define “compensation earnable” in the
    CalPERS statute. (Ibid.) The CalPERS language had been
    repealed a decade earlier and replaced with a more detailed
    statute, which included a new category of items of compensation
    labeled “special compensation.”      Although this legislation
    “recast[] and redefine[d]” compensation earnable under
    CalPERS, we found no indication “that the inclusion of ‘special
    compensation’ in the definition adds anything that was not
    included under the prior legislation.” (Id. at p. 505.) As we
    observed, many of the items of compensation that the Ventura
    County plaintiffs sought to include in CERL’s compensation
    earnable “appear to be the type of ‘special compensation’ items
    which are included in the ‘compensation earnable’ of PERS
    members.” (Ventura County, at p. 504.) On that basis, we held
    that all of the various “premiums in dispute” are included in
    compensation earnable. (Id. at p. 505.) Although we did not
    61
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    specifically identify these premiums, the phrase appears to refer
    to all of the “items plaintiffs seek to have included in their
    ‘compensation earnable.’ ” (Id. at p. 504.)
    b. Subdivision (b)(4) did not modify CERL
    We first address the pre-PEPRA status of termination
    pay, now excluded by section 31461, subdivision (b)(4), because
    it is the only aspect of section 31461 specifically addressed by a
    published appellate decision following Ventura County. As
    discussed above, the definitions of “compensation” and
    “compensation earnable” adopted in Ventura County effectively
    overturned aspects of Guelfi, supra, 
    145 Cal.App.3d 297
    , which
    had guided the implementation of section 31461 prior to Ventura
    County. Our disapproval of Guelfi’s long-standing rulings
    spawned a variety of lawsuits statewide by county employees
    and pensioners, as we anticipated. (Ventura County, supra,
    16 Cal.4th at p. 507). These lawsuits were consolidated in a
    single proceeding, and those that did not settle became the
    subject of Retirement Cases, supra, 
    110 Cal.App.4th 426
    .25
    Among the issues addressed by Retirement Cases was the
    inclusion in final compensation of “termination pay,” which the
    court defined as “one-time cash payments made to plan
    members upon retirement for accrued but unused compensatory
    time, sick leave time, and vacation or holiday time.” (Retirement
    Cases, supra, 110 Cal.App.4th at p. 473.) Retirement Cases
    25
    The lawsuits in Alameda, Contra Costa, and Merced
    County that resulted in the settlement agreements addressed
    ante, part II.A of this decision, were included in the consolidated
    proceeding in Retirement Cases, but each was settled prior to the
    trial court’s entry of judgment in the proceeding.
    62
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    recognized that Ventura County had defined such payments as
    compensation. The court ruled, however, that they were not a
    part of “final compensation” because, under the relevant
    statutes, the period for calculating final compensation “extends
    up to, but does not include retirement.” (Id. at p. 474; see
    §§ 31462, 31462.1.) Until the cash compensation was received,
    the accrued leave time remained an in-kind benefit, excluded
    from compensation under section 31460. Yet at the time the
    cash was received, the final compensation period had ended.
    (Retirement Cases, at p. 474.) This ruling was subsequently
    adopted in Salus v. San Diego County Employees Retirement
    Assn. (2004) 
    117 Cal.App.4th 734
    , 740.
    Because Retirement Cases and Salus remained good law
    at the time PEPRA was enacted, section 31461, subdivision
    (b)(4) made no material change in the implementation of CERL.
    Subdivision (b)(4) addresses “[p]ayments made at the
    termination of employment.” Assuming, as the Court of Appeal
    concluded (Alameda Sheriffs, supra, 19 Cal.App.5th at p. 104),
    that this phrase refers to the same type of payments deemed
    “termination pay” by Retirement Cases and Salus — that is,
    payments made after the employment relationship ends —
    CERL already restricted the pensionability of termination pay
    when PEPRA became law.26 As so interpreted, subdivision
    26
    Alternatively, it can be argued that section 31461,
    subdivision (b)(4), which governs “[p]ayments made at the
    termination of employment,” includes payments made in
    anticipation of an employee’s imminent retirement but received
    prior to termination. Interpreted in this manner, subdivision
    (b)(4) would constitute a narrowing of the broad ruling of
    Ventura County. In that case, however, subdivision (b)(4) would
    63
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    (b)(4) did not impair county employee pension rights for
    purposes of the contract clause.
    c. Subdivision (b)(1), (2), and (3) effected a change
    in CERL
    We have not located any other pre-PEPRA judicial
    decision that addresses the inclusion in compensation earnable
    of the remaining items excluded or limited by the PEPRA
    amendment.27 We conclude, however, that the ruling in Ventura
    County was sufficiently clear in including within compensation
    earnable the items of compensation now excluded or limited by
    section 31461, subdivision (b)(1) through (3) that these
    provisions must be considered a change in the law for purposes
    of the contract clause.
    As noted above, Ventura County’s consideration of these
    issues was brief and relatively summary, but the decision
    appears to include the items excluded or limited by the PEPRA
    amendment within the definition of compensation earnable.
    The decision began with a consideration of CERL’s definition of
    “compensation” in section 31640, which concluded that the
    definition includes virtually any item of cash compensation
    received by a county employee. As the court explained, “[w]hen
    paid in cash, the payment is remuneration and, as it is not
    also be largely coextensive with subdivision (b)(2). Because the
    interpretive issue is not material to our resolution of this
    matter, we do not address it further.
    27
    Section 31461, subdivision (c) states that “[t]he terms of
    subdivision (b) are intended to be consistent with and not in
    conflict with the holdings” in Retirement Cases and Salus, but
    neither decision addresses a relevant issue other than
    termination pay.
    64
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    excluded, it is ‘compensation’ under section 31460.” (Ventura
    County, supra, 16 Cal.4th at p. 497.) Although that sentence
    related specifically to “cash payments made in lieu of providing
    the same advantages in kind” (ibid.), it captures the court’s
    general ruling regarding the meaning of “compensation.” This
    term, of course, is the foundation for compensation earnable,
    which is defined as “the average compensation . . . for the period
    under consideration.” (§ 31461, subd. (a), italics added.) Given
    the broad definition of “compensation” adopted by Ventura
    County and the absence of any limitations on that term as it is
    used in section 31461, it is reasonable to construe the decision
    as holding that compensation provided as cash remuneration, if
    not expressly excluded from compensation earnable, is included
    in that term. Because none of the items excluded or limited by
    subdivision (b)(1) through (3) was excluded prior to PEPRA, the
    exclusion of those items must be regarded as a change in the
    law.
    Our discussion in Ventura County of the specific items of
    compensation there at issue is consistent with this
    interpretation. As noted above, the court held that all of the
    “premiums in dispute” are included within compensation
    earnable, presumably referring to all of the items put at issue
    by plaintiffs. (Ventura County, supra, 16 Cal.4th at p. 505.)
    Those items included, among others, “additional compensation
    for scheduled meal periods for designated employees, pay in lieu
    of annual leave accrual, holiday pay, . . . [and] a longevity
    incentive.” (Id. at pp. 488–489; see id. at pp. 488–489, fns. 6, 7,
    11 & 12.) These items are similar to those subsequently
    excluded or limited by section 31461, subdivision (b)(2) and (3)
    65
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    — and yet Ventura County had ruled that they are included
    within compensation earnable.
    Defendants argue that CERL had never permitted the
    inclusion in compensation earnable of the various items of
    compensation excluded or limited by section 31461, subdivision
    (b)(1) to (3). The argument is not based on Ventura County or
    any other judicial interpretation of CERL, but rather on
    defendants’ own interpretations of the language of the
    governing statutes. In effect, they argue, the pre-PEPRA
    provisions of CERL should have been interpreted to exclude
    these items. Even assuming their interpretive arguments have
    merit, our consideration of a change in the law must focus on
    how the governing statutes were interpreted, not how they
    might have been interpreted. Our contract clause jurisprudence
    is designed, at least in part, to protect the reasonable
    expectations of public employees covered by the pension plan.
    (Betts, supra, 21 Cal.3d at p. 866; see Cal Fire, 
    supra,
     6 Cal.5th
    at p. 989, fn. 14.) Those reasonable expectations are defined not
    only by the statutes themselves, but also by judicial
    interpretations of those statutes. Employees can reasonably
    expect their pensions to be calculated according to existing
    judicial interpretations, at least until those interpretations are
    limited or overruled by subsequent authority. Because, as
    discussed above, Ventura County adopted a broad interpretation
    of compensation earnable and because that interpretation was
    never changed or otherwise limited by subsequent judicial or
    statutory authority prior to PEPRA, we measure the PEPRA
    66
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    amendment against that interpretation, not by a different
    interpretation that might have been adopted.28
    The District, for example, relies on an argument made to
    the Contra Costa County retirement board by its outside
    counsel, who opined that the term “final compensation” should
    be interpreted to limit the inclusion of cashed out leave time to
    leave time actually earned by the employee during a final
    compensation year. Although we might have accepted that
    argument had it been presented in Ventura County, it was not.
    Our decision was unqualified in this regard. Similarly, the State
    argues that the compensation excluded by section 31461,
    subdivision (b)(1) was “never pensionable” under CERL because
    “the idea of basing a public employee’s pension on payments
    intended to spike the member’s retirement benefit, and not
    exclusively on compensation for faithful service, contradicts the
    fundamental theory of a pension system.” Although this is
    another plausible argument, Ventura County made no such
    exception in its general ruling that compensation earnable
    includes all non-excluded cash remuneration. The State’s
    arguments regarding subdivision (b)(2) and (3) similarly rely on
    its own statutory constructions, rather than the actual ruling of
    Ventura County. For the reasons discussed above, we conclude
    that, when measured against a reasonable reading of the only
    28
    Our conclusion might be different if the Legislature had
    timely amended an ambiguous statute in a manner contrary to
    the interpretation adopted in a judicial decision, suggesting its
    disagreement with the court’s interpretation, as occurred in
    Gatewood, supra, 
    175 Cal.App.3d 311
    . Because the Legislature
    did not amend CERL in response to Ventura County, that
    situation is not before us.
    67
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    applicable judicial guidance — our ruling in Ventura County —
    subdivision (b)(1), (2), and (3) changed the law of compensation
    earnable.
    3. PEPRA’s amendment of CERL is not constitutional
    merely because it applies only to pension benefits
    awarded after its enactment
    Before turning to the application of the California Rule to
    subdivision (b)(1) to (3) of section 31461, we address an
    argument prominently urged by the State to support the
    constitutionality of the PEPRA amendment. Regardless of the
    impact on the pensions of county employees who retire after its
    effective date, the State argues, the PEPRA amendment “could
    not have impaired any vested rights, because [PEPRA’s
    changes] only operate prospectively.” According to the State,
    PEPRA should be held consistent with the contract clause
    because it “does not affect the pension of anyone who retired
    before its effective date. Nor does it retroactively re-characterize
    the pensionability of any item that was earned and already
    included in an employee’s final pensionable compensation before
    [its] effective date.” The argument disregards our long-standing
    contract clause jurisprudence, but there is another, more
    fundamental reason to reject it. The argument misunderstands
    the retroactive effect of the PEPRA amendment on county
    employee pension benefits.
    It goes almost without saying that the State’s argument is
    inconsistent with our prior pension decisions, and the State
    makes no attempt to reconcile its position with those decisions.
    The contention, in essence, is that the PEPRA amendment is
    prospective because it does not change the pension benefits of
    persons who have already retired or the pensionability of items
    68
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    of compensation earned by county employees who are
    sufficiently near to retirement to have entered the final
    compensation period. So long as modifications of pension law
    are prospective as so defined, the State argues, the Legislature
    is unconstrained by the contract clause. Our decisions are
    fundamentally at odds with this conception of the contract
    clause. In Kern, our first decision to grapple with the
    requirements of the contract clause, the pension modification —
    in fact, a wholesale repeal — applied only to “persons not then
    eligible for retirement.” (Kern, supra, 29 Cal.2d at p. 850.) We
    did not suggest that this limitation avoided the contract clause
    issue; on the contrary, we overturned the repeal. (Kern, at
    p. 856.) In several subsequent decisions we found pension
    modifications untenable under the contract clause. None of
    those modifications applied to persons already retired, yet that
    restriction did not preserve their constitutionality. Nor did we
    suggest that they would have survived constitutional scrutiny if
    only their impact had been limited to persons who had not
    entered the final compensation period. (E.g., Eu, supra,
    54 Cal.3d at pp. 530–532 [ballot initiative’s pension
    modifications could not be applied to state legislators who
    assumed office prior to its passage]; Betts, supra, 21 Cal.3d at
    p. 867 [pension modification could not be applied to plaintiff,
    who was employed by the state prior to its enactment]; Abbott,
    supra, 50 Cal.2d at pp. 453–455 [holding that a pension
    modification enacted 35 years earlier could not be applied to
    persons who were employed by the defendant city at the time
    the change occurred]; Allen I, supra, 45 Cal.2d at pp. 131–133.)
    On the contrary, the State’s argument is entirely at odds with
    our contract clause jurisprudence.
    69
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Because it misunderstands the impact of prospective
    application in this context, the State’s argument does not
    persuade us to modify our long-standing jurisprudence. In
    evaluating the proper scope of contract clause protection for
    pension rights, it is important to recognize the unusual nature
    of such rights as compensation. Public employees begin earning
    pension benefits from their first day of work. As a result, we
    have consistently held that pension rights become vested at that
    time. (Kern, supra, 29 Cal.2d at p. 855 [a public employee “has
    actually earned some pension rights as soon as he has performed
    substantial services for his employer”]; Dryden v. Board of
    Pension Commissioners (1936) 
    6 Cal.2d 575
    , 579 [right to
    pension becomes vested upon acceptance of employment];
    McGlynn v. State of California (2018) 
    21 Cal.App.5th 548
    , 558–
    559 [vested pension rights accrue upon commencement of
    work].) Yet the value of pension rights is not determined until
    the end of an employee’s career, when the retiring employee’s
    pension benefit is calculated. CERL perfectly illustrates this.
    The amount of a CERL pension benefit is based on a county
    employee’s years of service, age at retirement, and
    compensation during a specific one or three-year period. The
    first two cannot be determined until retirement, and
    pensionable compensation is also normally determined near, if
    not at, the end of the employee’s career. Further, it is the law
    in effect at the time of retirement that is used to calculate the
    amount of an employee’s pension benefit. Generally speaking,
    the law prevailing during the period when pension rights are
    earned — that is, during an employee’s career — does not factor
    into the calculation of the value of those pension rights unless
    70
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    that law is still in effect when the pension benefit is calculated
    — i.e., at retirement.
    Because it is the law in effect at the end of a public
    employee’s career that is used to determine the amount of the
    pension benefit, most modifications of the provisions governing
    the benefit calculation have, in practice, a profoundly
    retroactive impact on persons who began their employment
    prior to the modification. From early on, we have acknowledged
    that the Legislature may modify the statutory terms and
    conditions governing a public employee’s pension over the
    course of his or her career. (Kern, supra, 29 Cal.2d at pp. 853–
    854, citing Pennie v. Reis (1889) 
    80 Cal. 266
     [upholding the
    Legislature’s substitution of a pension plan for the lump-sum
    death benefit available at the beginning of the plaintiff peace
    officer’s career].) Yet, by normal operation of the pension
    system, such modifications apply not only to the pension rights
    accrued by public employees after the effective date of the
    modification, but also to all pension rights accrued prior. To the
    extent the modification changes the manner in which a pension
    benefit is calculated, it changes the value of the pension rights
    accrued from the very inception of an employee’s career. Most
    significant modifications of a pension plan therefore have an
    impact reaching far into the past.
    For this reason, the State’s argument that the PEPRA
    amendment cannot have violated vested rights because it
    operates only prospectively is misguided.             Although the
    amendment’s provisions apply only to employees who retire
    after its effective date, its exclusions and limitations are used in
    the calculation that, by setting the amount of their pension
    benefit, determines the value of the pension rights these
    71
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    employees accrued over the entire course of their careers. In
    practice, county employee pension benefits will be calculated as
    though the PEPRA amendment was the governing law from the
    beginning of their careers.
    To effect a pension modification that is prospective in
    practice, the Legislature would be required to enact a law that
    applies only to pension rights accrued after its effective date,
    while preserving unchanged the law applicable to pension rights
    accrued prior to that date. Because PEPRA’s amendment
    applies to all pension rights, regardless of when they were
    accrued, the State’s claim of prospective operation is
    unpersuasive.29
    4. The PEPRA amendment did not violate the
    California Rule
    In evaluating the constitutionality of modifications to a
    public employee pension plan, Allen I requires a court first to
    determine whether the modification imposes disadvantages on
    affected employees, relative to the preexisting pension plan,
    and, if so, whether the disadvantages are accompanied by
    comparable new advantages. Assuming the disadvantages are
    not offset, the court must then determine whether the legislative
    body’s purpose in making the changes was sufficient, for
    constitutional purposes, to justify an impairment of pension
    rights. Although public employee pension plans may be
    modified “for the purpose of keeping [the] pension system
    29
    In making this observation, we do not mean to suggest
    that a change that is prospective in practice would thereby be
    insulated from contract clause scrutiny under Allen I. We
    intend merely to illustrate the type of amendment that, in the
    pension context, would be truly prospective in its impact.
    72
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    flexible to permit adjustments in accord with changing
    conditions and at the same time maintain the integrity of the
    system,” to survive contract clause scrutiny such changes “must
    bear some material relation to the theory of a pension system
    and its successful operation.” (Allen I, supra, 45 Cal.2d at
    p. 131.) Finally, assuming the changes were made for a proper
    purpose, one further analytic step is necessary, as explicated
    below:     The Legislature’s decision to impose financial
    disadvantages on public employees without providing
    comparable advantages will be upheld under the contract clause
    only if providing comparable advantages would undermine, or
    would otherwise be inconsistent with, the modification’s
    constitutionally permissible purpose. We conclude that the
    PEPRA amendment survives this constitutional scrutiny.
    a. The PEPRA amendment imposed
    disadvantages on county employees without
    providing comparable advantages
    There is no question that the PEPRA amendment
    diminished county employees’ pension rights without providing
    any comparable new advantages. New subdivision (b)(1)
    through (3) of section 31461 exclude from compensation
    earnable categories of compensation that, prior to PEPRA, were
    includable.30 Although the impact on the pension rights of
    individual employees will vary, depending on the employee’s
    personal circumstances and the policy adopted prior to PEPRA
    30
    Because, as explained above, section 31461, subdivision
    (b)(4) did not change CERL for purposes of the contract clause,
    we need not evaluate that subdivision under the California
    Rule. Our conclusion would not, however, be different if
    subdivision (b)(4) were included in the analysis.
    73
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    by his or her county retirement board regarding the inclusion of
    these categories, it seems inescapable that the pension benefits
    of some county employees will be less than they otherwise would
    have been as a result of the PEPRA amendment. In the three
    counties involved in this matter, for example, retirement board
    policies permitted at least some of the types of compensation
    excluded by new subdivision (b) to be included in compensation
    earnable. Because that compensation will no longer be factored
    into employees’ final compensation, diminished pension benefits
    will result. There is no argument that PEPRA provided affected
    employees new advantages to offset the financial impact of these
    exclusions.
    b. PEPRA’s amendments of CERL were enacted for
    the constitutionally permissible purpose of
    conforming pension benefits more closely to the
    theory underlying section 31461 by closing
    loopholes and proscribing potentially abusive
    practices
    The second component of the California Rule is the
    requirement that the changes to a public pension plan have been
    enacted for a constitutionally permissible purpose.           The
    requirement is premised on the recognition in Kern, supra,
    
    29 Cal.2d 848
    , that “[t]he rule permitting modification of
    pensions is a necessary one since pension systems must be kept
    flexible to permit adjustments in accord with changing
    conditions and at the same time maintain the integrity of the
    system and carry out its beneficent policy.” (Id. at pp. 854–855.)
    While acknowledging this need for flexibility, we held in Allen I
    that modifications of public pension plans are permissible only
    if they relate to the operation of the plan and are intended to
    improve its functioning or adjust to changing conditions, holding
    74
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    that “alterations of employees’ pension rights must bear some
    material relation to the theory of a pension system and its
    successful operation . . . .” (Allen I, supra, 45 Cal.2d at p. 131.)
    Our decisions since Allen I have upheld few, if any,
    pension modifications as properly motivated. Perhaps the
    closest we have come to sustaining such a change was Betts,
    supra, 
    21 Cal.3d 859
    , in which we considered a modification of
    the pension system serving state officers. The plan originally
    pegged the amount of officers’ pension benefits to the salary of
    persons currently holding the same office held by the pensioner
    upon retirement. (Id. at p. 862.) The modification at issue
    changed this means of preserving the purchasing power of
    pension benefits to an annual cost of living adjustment. (Id. at
    p. 865.) We expressed a willingness to entertain the state’s
    argument that the change was constitutionally permissible
    because it represented the replacement of “one ‘cost of living’
    formula” with another, but we concluded that the argument
    could not be sustained “[u]nder the circumstances of this case.”
    (Ibid.)
    Our decisions have more often given substance to this
    requirement of Allen I by delineating what is not a
    constitutionally permissible purpose. In Wallace and Allen I,
    both of which found a violation of contract clause protections,
    the defendant cities advanced essentially political reasons for
    the pension modifications at issue. In Allen I, the city adopted
    three changes to a pension system covering senior employees
    that had the effect of increasing the cost of participation in the
    plan for employees and diminishing their benefits. The city
    characterized the changes as an attempt to equalize the pension
    benefits of the senior employees and more recent hires, who
    75
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    were covered by a different, less generous pension plan. (Allen I,
    supra, 45 Cal.2d at p. 133.) We found this rationale insufficient,
    reasoning that “[s]uch purposes, however beneficial to the city,
    . . . constitute no justification for materially reducing the vested
    contractual rights earned by plaintiffs . . . .” (Ibid.) In Wallace,
    supra, 
    42 Cal.2d 180
    , we rejected as improperly motivated a
    modification that stripped pension benefits from retirees upon
    conviction of a felony in order “to meet the objections of
    taxpayers who would be opposed to contributing funds for the
    maintenance of a pensioner who had been convicted of a felony.”
    (Id. at p. 185.) Finally, in Abbott, supra, 
    50 Cal.2d 438
    , we
    addressed a city’s argument that the modification of its pension
    plan was justified as an attempt to stem rising pension costs.
    In defense of its switch from a fluctuating pension benefit,
    intended to compensate for changes in the cost of living, to a
    fixed benefit, the city contended that “if the amendments had
    not been made ‘the cost to the City and its taxpayers would have
    reached such staggering proportions that, in all probability, the
    system would have ceased to exist.’ ” (Id. at p. 455.) We rejected
    the argument, observing that the city’s hypothetical prediction
    of costs so great as to lead to the pension system’s abolition was
    speculative and failed to account for the fact that a pension
    system is essential to attract qualified municipal employees.
    (Ibid.) This left the city to rely only on rising costs, an argument
    we found insufficient, without more, to justify the change.
    (Ibid.)
    Given our past decisions, we have no difficulty finding that
    the PEPRA amendment was enacted to maintain the integrity
    of the pension system and “bear[s] some material relation to the
    theory of a pension system and its successful operation.”
    76
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
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    Opinion of the Court by Cantil-Sakauye, C. J.
    (Allen I, supra, 45 Cal.2d at p. 131.) As discussed above, the
    Legislature’s primary purpose in enacting the PEPRA
    amendment was to modify CERL’s “very broad and general
    definition of ‘compensation earnable’ ” to prevent pension
    spiking. (Assem. Com. on Public Employees, Retirement and
    Social Security, Analysis of Assem. Bill No. 340 (2011–2012 Reg.
    Sess.) Apr. 25, 2011, p. 3.) An examination of the changes made
    by PEPRA demonstrates that the Legislature accomplished this
    objective by introducing new exclusions and limitations that
    bring the definition of “compensation earnable” into closer
    alignment with the preexisting theory underlying CERL’s
    determination of pension benefits. A legislative intent to align
    the express language of a pension statute more closely with its
    intended manner of functioning directly relates to both the
    theory of a pension system and its successful operation.
    The definition of “compensation earnable” in section
    31461, which specifies the manner in which a retiring
    employee’s compensation is used in calculating his or her
    pension benefit, is a critical component in establishing the
    general theory underlying CERL’s payment of pension benefits.
    As discussed above, compensation earnable is based on the
    retiring employee’s average daily rate of pay during the final
    compensation period, applied over the number of days ordinarily
    worked during that time by the employee’s peers, identified as
    “persons in the same grade or class of positions during the
    period.” (§ 31461, subd. (a); see Ventura County, supra,
    16 Cal.4th at p. 504.) Among employees in this peer group,
    differences in pension benefits are therefore determined by
    variations in individual employees’ average daily compensation
    during the final compensation period, rather than by the
    77
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    relative amount of time the employees worked. An employee
    becomes entitled to a greater pension benefit than his or her
    peers by being compensated at higher rate, not by working more
    days. This is so because the calculation required by section
    31461 assumes that all employees have worked the same
    number of days — that is, “the average number of days
    ordinarily worked by persons in the same grade or class of
    positions during the period” — and excludes overtime pay
    earned outside of “normally scheduled or regular working
    hours.” (§§ 31461, subd. (a), 31461.6, subd. (a).)
    Given this fundamental definition, the inclusion in final
    compensation of the items of compensation excluded or limited
    by the PEPRA amendment can be viewed as distorting the
    pension calculation and increasing pension benefits beyond the
    amount anticipated by the underlying theory of compensation
    earnable. Section 31461, subdivision (b)(2), for example, limits
    the inclusion of payments for unused leave time in
    compensation earnable to the amount “earned and payable . . .
    during the final average salary period, regardless of when
    reported or paid.” Restricting the inclusion of such payments to
    those earned in the final compensation period promotes the
    underlying theory established by the general language of section
    31461. Leave time earned prior to the final compensation period
    is, necessarily, awarded in return for work performed prior to
    that period. The receipt of cash-out payments for such leave
    time during the final compensation period therefore has the
    effect of shifting compensation for that earlier work into the
    final compensation period, thereby artificially inflating the days
    of compensation received during the final compensation period.
    This is incompatible with the general approach of section 31461,
    78
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    which calculates pensionable compensation on the basis of the
    same work time for every employee within a pay class. Limiting
    the inclusion of such payments in the compensation earnable
    calculation to the amount “earned and payable” during the final
    compensation period, as required by section 31461, subdivision
    (b)(2), reduces the potential for distortion from this type of
    compensation. (See Alameda Sheriffs, supra, 19 Cal.App.5th at
    pp. 97–98 [“the touchstone for calculating compensation
    earnable is still the compensation that was actually earned by
    the retiring employee in ‘the period under consideration’ ”].)31 It
    is noteworthy that, since 1995, CERL has treated payments
    from a deferred compensation plan in this manner, deeming
    deferred compensation to be included in compensation “when
    earned, rather than when paid.” (§ 31461, subd. (a); see Stats.
    31
    The Court of Appeal interpreted section 31461,
    subdivision (b)(2) to permit the inclusion of an unlimited
    amount of cashed out leave time in compensation earnable,
    regardless when accrued, by holding that the phrase “earned
    and payable” in subdivision (b)(2) modifies “leave cash-outs,”
    rather than the leave time itself. It then concluded that the
    cash-out is earned when paid, rather than when the leave time
    is accrued. (Alameda Sheriffs, supra, 19 Cal.App.5th at pp. 98-
    100.) Although, in practice, an employee can accrue only a
    limited amount of leave time in a final compensation period,
    there is no similar practical constraint on the amount of leave
    time that can be cashed out during that time. The Court of
    Appeal’s interpretation therefore renders subdivision (b)(2)
    pointless, and an “interpretation of statutory language that
    renders the language useless” is, of course, disfavored.
    (Williams v. Superior Court (1993) 
    5 Cal.4th 337
    , 354.) A better
    reading requires “earned and payable” to refer to the amount of
    leave time that can be accrued during the final compensation
    period.
    79
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    1995, ch. 558, § 1.) Subdivision (b)(2) is consistent with this
    approach and serves the underlying theory of compensation
    earnable in the same manner.
    A comparable rationale supports the enactment of section
    31461, subdivision (b)(3), which excludes “[p]ayments for
    additional services rendered outside of normal working hours.”
    Section 31461 bases compensation earnable on the same
    number of days worked for all employees within a particular pay
    grade.     The long-standing exclusion of overtime from
    compensation earnable, now embodied in section 31461.6,
    confirms that an employee’s pensionable compensation is
    generally to be based on pay for work performed during normal
    working hours.32 Consistently with this exclusion of overtime,
    subdivision (b)(3) requires the exclusion of compensation for
    other services rendered outside normal working hours. This
    restriction prevents employees from volunteering, during their
    final compensation period, to perform additional services
    outside normal working hours in order to artificially inflate
    their daily rate of pay. Subdivision (b)(3) therefore reinforces
    the portion of section 31461 that requires compensation
    earnable to be based on the same work year for all employees
    within a particular pay grade.
    32
    This understanding is reinforced by the text of section
    31461.6, which excludes “overtime premium pay” unless the pay
    is received as compensation “for hours worked within the
    normally scheduled or regular working hours that are in excess
    of the statutory maximum workweek.” (Id., subd. (a).) In other
    words, overtime pay is not excluded if it is earned by an
    employee as part of his or her “normally scheduled or regular
    working hours.” (Ibid.) Only payment for excess hours, as
    compared to the employee’s peers, is excluded.
    80
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Finally, section 31461, subdivision (b)(1) excludes
    compensation “paid to enhance a member’s retirement benefit.”
    As discussed above, the three examples of potentially excludable
    compensation provided in subdivision (b)(1)(A) through (C)
    demonstrate that this section is intended to prevent various
    forms of manipulation of the compensation earnable calculation.
    Subdivision (b)(1)(A) categorizes as suspicious cash
    compensation received in lieu of a benefit that had previously
    been provided in kind. This practice has the effect of converting
    a nonpensionable benefit into pensionable compensation.
    Subdivision (b)(1)(B) calls attention to “one-time or ad hoc
    payment[s]” made to an employee but not to peers. The ad hoc
    and exclusive nature of the payment presumably signals the
    possibility of manipulation of the pension calculation.
    Subdivision (b)(1)(C) casts doubt on payments that are made
    solely due to termination yet are paid prior to termination. This
    practice would shift such compensation into the final
    compensation period, again converting a nonpensionable benefit
    into pensionable compensation. The common thread is the
    alteration of the normal pattern of an employee’s compensation
    for the purpose of increasing the compensation received during
    the final compensation period. The exclusion mandated by
    subdivision (b)(1) therefore reinforces the requirement in
    section 31461 that an employee’s pension benefits be based on
    his or her compensation. As the word implies, “compensation”
    is money paid in return for the performance of services. If a
    payment is made to an employee for the purpose of enhancing
    his or her pension benefit, it is not paid in return for the delivery
    of services but for another purpose entirely — to boost the
    employee’s postemployment pension benefits. This is clear
    81
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    pension abuse, and the express exclusion of such payments from
    compensation earnable is fully consistent with the theory
    underlying section 31461.
    As the preceding discussion demonstrates, the exclusions
    introduced by PEPRA unquestionably “bear [a] material
    relation to the theory of a pension system and its successful
    operation.” (Allen I, supra, 45 Cal.2d at p. 131; see Claypool v.
    Wilson (1992) 
    4 Cal.App.4th 646
    , 666 [a valid justification for
    changing a pension system “must relate to considerations
    internal to the pension system”].)           The definition of
    compensation earnable is a critical element in the calculation of
    pension benefits. The interplay of those elements is the very
    embodiment of “the theory of [the CERL] pension system,” and
    a workable definition of compensation earnable is crucial to “its
    successful operation.” (Allen I, at p. 131.) Further, as the
    Legislature explained in passing the amendments, the
    amendment was designed to limit pension spiking, the
    manipulation of compensation to artificially increase a pension
    benefit. Unquestionably, preventing manipulation of the terms
    of a pension plan to produce outsize benefits is a substantively
    proper reason for modifying the plan, since it serves to maintain
    the system’s financial integrity and discourage gamesmanship
    in the management of compensation practices.
    c. The Legislature was not constitutionally
    required to offset the disadvantages imposed by
    PEPRA’s amendment of section 31461 with
    comparable advantages
    In featuring a properly motivated pension modification
    that imposes uncompensated financial disadvantages on plan
    participants, this matter requires us to address for the first time
    82
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    the interplay of the two parts of the Allen I test. There is no
    doubt that Allen I requires a modification of public employee
    pension rights to have been properly motivated — that is, to
    have been enacted “for the purpose of keeping a pension system
    flexible to permit adjustments in accord with changing
    conditions and at the same time maintain the integrity of the
    system” and to “bear some material relation to the theory of a
    pension system and its successful operation.” (Allen I, supra,
    45 Cal.2d at p. 131.) Less clear is the role of the second part of
    the test, the offsetting of financial disadvantages with
    comparable new advantages. Because neither Allen I nor any of
    our subsequent pension decisions has featured a properly
    motivated pension modification that failed to provide
    comparable advantages to offset its disadvantages, we have
    never ruled on the constitutionality of such a modification. The
    ruling of Allen I that disadvantages “should,” rather than
    “must,” be offset by comparable new advantages implies that the
    contract clause does not invariably require offsetting
    advantages, but we have never addressed the circumstances
    under which such advantages need not be provided.
    Because we have concluded that the PEPRA amendment
    was enacted for a constitutionally permissible purpose yet
    imposes uncompensated financial disadvantages, we must now
    turn to this unresolved issue. For reasons explained below, we
    conclude that the contract clause requires a properly motivated
    pension modification to provide comparable new advantages to
    offset any financial disadvantages unless to do so would
    undermine, or would otherwise be inconsistent with, the
    constitutionally   permissible     purpose    underlying    the
    83
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    modification. Further, we hold that the PEPRA amendment at
    issue here is constitutional under this analysis.
    1. A modification of public employee pension
    rights will not be sustained under the
    contract clause solely because it serves a
    constitutionally permissible purpose
    It is possible to read Allen I to suggest that a modification
    of public employee pension rights that is properly motivated is
    constitutional, regardless of its imposition of uncompensated
    disadvantages. Under such an interpretation, our analysis
    would end here, since we have concluded that the PEPRA
    amendment serves a constitutionally permissible purpose. Two
    considerations dissuade us from such a reading.
    The first is the use by Allen I of “should” in connection
    with the first part of its test, that “changes in a pension plan
    which result in disadvantage to employees should be
    accompanied by comparable new advantages.” (Allen I, supra,
    45 Cal.2d at p. 131, italics added.) If the use of “should” by
    Allen I is not to be disregarded as merely precatory, it must be
    understood to mean, at a minimum, that although some
    properly motivated pension modifications that fail to provide
    comparable advantages will pass constitutional scrutiny, others
    will not. Further, although this language implies that the
    enactment of comparable advantages is not an invariable
    constitutional requirement, the use of such a strongly directive
    word suggests that comparable advantages are preferred.
    Speaking generally, modifications of public employee pension
    plans “should” preserve the value of plan participants’ pension
    rights.
    84
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    Second, as we emphasized in Allen I, the ultimate test for
    modifications to a public pension plan under the contract clause
    is reasonableness: “Such modifications must be reasonable, and
    it is for the courts to determine upon the facts of each case what
    constitutes a permissible change.” (Allen I, supra, 45 Cal.2d at
    p. 131.) Even when a court finds that a pension modification
    was enacted for a constitutionally proper purpose, that alone
    does not ensure its reasonableness. A further test must be
    interposed to ensure that any imposition of uncompensated
    financial disadvantages on plan participants as a result of the
    properly motivated pension modification is reasonable.
    2. Modifications to a public employee pension
    plan that serve a proper purpose yet impose
    uncompensated disadvantages will be
    sustained only if providing comparable
    advantages would undermine, or would
    otherwise be inconsistent with, their
    constitutionally permissible purpose
    The contract clause protects from substantial impairment
    public employees’ implied contractual rights in their pension
    benefits. Despite this protection, we have long recognized that
    public employees’ pension benefits are not immutable, “since
    pension systems must be kept flexible to permit adjustments in
    accord with changing conditions and at the same time maintain
    the integrity of the system and carry out its beneficent policy.”
    (Kern, supra, 29 Cal.2d at pp. 854–855.) At times, those
    adjustments may incidentally reduce the value of employees’
    pension rights. As we recognized in Allen I, this does not
    necessarily mean that the adjustments are unconstitutional.
    It might have been possible to adopt a rule requiring that
    any disadvantages imposed by a pension modification must be
    85
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    offset by comparable new advantages. But in Kern we
    effectively disavowed such a rule, holding, “The employee does
    not have a right to any fixed or definite benefits, but only to a
    substantial or reasonable pension.                 There is no
    inconsistency therefore in holding that he has a vested right to
    a pension but that the amount, terms and conditions of the
    benefits may be altered.” (Kern, supra, 29 Cal.2d at p. 855.)
    Plainly, however, the recognition that pension benefits are not
    immune from change does not grant carte blanche to the
    Legislature. As discussed at length above, the California Rule
    has two components: The Legislature must act for a proper
    purpose and the net level of benefits “should” be preserved.
    (Allen I, supra, 45 Cal.2d at p. 131.) The logical implication of
    the latter component is that the contract clause requires the
    level of pension benefits to be preserved if it is feasible to do so
    without undermining the Legislature’s permissible purpose in
    enacting the pension modification.
    This requirement gives substance to the instruction in
    Allen I that the disadvantages created by a pension modification
    “should be accompanied by comparable new advantages.” (Allen
    I, supra, 45 Cal.2d at p. 131, italics added.) When the
    Legislature can feasibly preserve the value of public employee
    pension rights by providing comparable new advantages — that
    is, when providing such advantages is not inconsistent with the
    constitutionally permissible purpose of the changes — the
    Constitution requires it to do so. On the other hand, when
    providing comparable new advantages would undermine, or
    would otherwise be inconsistent with, the constitutionally
    permissible purpose of the change, the contract clause imposes
    no requirement that the Legislature frustrate its permissible
    86
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    purpose by providing comparable new advantages. Such
    modifications will be upheld under our Constitution despite the
    financial disadvantage they impose on public employee pension
    benefits.
    This rule is consistent with our past constitutional rulings
    on the power of the state to impair its own contracts. We have
    always recognized that such impairments may survive contract
    clause scrutiny, but we have also held that they are subject to
    significant constraints. “ ‘[A] State is not completely free to
    consider impairing the obligations of its own contracts on a par
    with other policy alternatives. Similarly, a State is not free to
    impose a drastic impairment when an evident and more
    moderate course would serve its purposes equally well.’ ”
    (Sonoma Employees, 
    supra,
     23 Cal.3d at p. 308, quoting U.S.
    Trust, 
    supra,
     431 U.S. at pp. 30–31.) When preserving the value
    of public employee pension rights does not disserve the
    Legislature’s constitutionally permissible pension reform
    objectives, the contract clause requires it to preserve that value.
    3. Requiring the provision of comparable new
    advantages would undermine the
    constitutionally permissible purpose of the
    PEPRA amendment
    PEPRA provided no new advantages to existing county
    employees to offset any impact of the exclusions and limitations
    in new subdivision (b)(1) through (3) of section 31461. As
    indicated above, however, we conclude that providing such
    advantages would have undermined the amendment’s
    constitutionally permissible purpose. Accordingly, the PEPRA
    amendment did not violate the contract clause of our
    Constitution, notwithstanding the failure of the Legislature to
    87
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    provide new features to offset the financial disadvantages of the
    PEPRA amendment.
    The purpose of PEPRA’s amendment of section 31461 was
    not to change in any fundamental way the implementation of
    the CERL pension system. Save for the exclusion of a few items
    from pensionable compensation, CERL operates as it did before
    PEPRA. Nor was it to reduce the cost burden of the system on
    counties, other than incidentally. Rather, as explained above,
    the purpose was to bring administrative practice under section
    31461 into closer alignment with the system’s underlying theory
    by excluding income designed to artificially inflate a pension
    benefit (§ 31461, subd. (b)(1)) and limiting the inclusion of other
    types of compensation that were reasonably viewed as
    inconsistent with CERL’s general approach to pensionable
    compensation (§ 31461, subd. (b)(2), (3)). Stated differently, the
    Legislature was attempting to reduce manipulation and abuse
    by closing loopholes created by the very general language of
    sections 31460 through 31462, which define “compensation,”
    “compensation earnable,” and “final compensation.” Each of the
    changes in subdivision (b)(1) through (3) is arguably inherent in
    the overall intent of section 31461, but the failure of the statute
    expressly to address these specific circumstances left their fate
    to the interpretations of 20 individual county retirement boards.
    This was exacerbated after our decision in Ventura County
    confirmed and gave effect to the broadly inclusive language of
    sections 31460 and 31461. PEPRA’s amendment compels
    uniformity on the issues it addresses, guaranteeing that
    compensation earnable will be implemented consistently with
    the Legislature’s intent in each CERL county.
    88
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    It would be anomalous, at best, to hold that the
    Constitution requires current employees to be provided an
    equivalent advantage to mitigate the effect of eliminating from
    compensation earnable payments that, in the view of the
    Legislature, are inconsistent with the theory underlying the
    pension system. Requiring comparable advantages would be
    wholly inconsistent with the Legislature’s purpose by restoring
    in some form advantages that, in the view of the Legislature,
    should not have been available to county employees in the first
    place.
    Experience with the implementation of a statutory
    pension system will inevitably reveal the need for change to
    close loopholes and foreclose opportunities for abuse. The
    Legislature must have the authority, discretion, and flexibility
    to address such problems without being required to, in effect,
    extend the life of the loopholes and the opportunities for abuse
    for the duration of the careers of current employees by providing
    comparable advantages. (See Pomona Police Officers’ Assn. v.
    City of Pomona (1997) 
    58 Cal.App.4th 578
    , 587 [Legislature
    amended CalPERS governing statute “to curb certain perceived
    pension abuses [by] local governments”].) Because requiring
    comparable advantages under these circumstances would
    significantly undermine the Legislature’s constitutionally
    permissible purpose, the contract clause imposes no such
    requirement.
    89
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Opinion of the Court by Cantil-Sakauye, C. J.
    III. DISPOSITION
    The State, at least implicitly, and amicus curiae California
    Business Roundtable, explicitly, urge us to use this decision as
    an occasion to reexamine and revise the California Rule, arguing
    that the rule constitutes an improper interpretation of the
    contract clause and bad public policy. Because we conclude that
    PEPRA’s amendment of CERL did not violate the contract
    clause under a proper application of the California Rule,
    however, we have no jurisprudential reason to undertake a
    fundamental reexamination of the rule. The test announced in
    Allen I, as explained and applied here, remains the law of
    California.
    For the reasons stated above, we reverse the decision of
    the Court of Appeal and remand the matter to that court, with
    directions to remand to the trial court to vacate the judgments
    entered in each of the three consolidated proceedings and to
    conduct further proceedings consistent with this decision.
    CANTIL-SAKAUYE, C. J.
    We Concur:
    CHIN, J.
    CORRIGAN, J.
    LIU, J.
    CUÉLLAR, J.
    KRUGER, J.
    GROBAN, J.
    90
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    S247095
    Concurring Opinion by Justice Cuéllar
    This case resolves a constitutional challenge to a recent
    amendment of the County Employees Retirement Law of 1937
    (Gov. Code, § 31450 et seq.). (See Stats. 2012, ch. 296, § 28.)
    What the amendment does is reduce county employees’ pension
    rights by narrowing the definition of “compensation earnable.”
    (Gov. Code, § 31461). What the amendment does not do is
    provide any comparable new advantages to county employees.
    We uphold the change nonetheless, in this quite particular
    situation:    The definitional change was enacted for a
    constitutionally permissible purpose — one that would have
    been undermined by the provision of any offsetting financial
    advantage for employees. (See maj. opn., ante, at pp. 87-89.)
    Two points are worth bearing in mind as one reads the
    court’s legal analysis in the context of this particular statutory
    amendment. First, the test the court applies here is merely a
    specific application, fit for this situation, of a more general
    inquiry: whether a reduction in pension rights without any
    comparable new advantages is “reasonable” and “necessary” to
    further “an important state interest.”          (Sonoma County
    Organization of Public Employees v. County of Sonoma (1979)
    
    23 Cal.3d 296
    , 308; see maj. opn., ante, at pp. 43, 45, 51, 85.)
    Modifications to pension rights present many complexities, and
    courts must determine their validity “ ‘upon the facts of each
    case.’ ” (Maj. opn., ante, at p. 85, quoting Allen v. City of Long
    ALAMEDA COUNTY DEPUTY SHERIFF’S ASSN. v.
    ALAMEDA COUNTY EMPLOYEES’ RETIREMENT ASSN.
    Cuéllar, J., concurring
    Beach (1955) 
    45 Cal.2d 128
    , 131.) Second, at no point did
    plaintiffs in this case attempt to show the amended definition
    was unnecessary to achieve the Legislature’s permissible
    purpose, or was otherwise unreasonable.
    With that understanding, I concur in the Chief Justice’s
    opinion for the court.
    CUÉLLAR, J.
    2
    See next page for addresses and telephone numbers for counsel who argued in Supreme Court.
    Name of Opinion Alameda County Deputy Sheriff’s Assn. v. Alameda County Employees’ Retirement
    Assn.
    __________________________________________________________________________________
    Unpublished Opinion
    Original Appeal
    Original Proceeding
    Review Granted XX 
    19 Cal.App.5th 61
    Rehearing Granted
    __________________________________________________________________________________
    Opinion No. S247095
    Date Filed: July 30, 2020
    __________________________________________________________________________________
    Court: Superior
    County: Contra Costa
    Judge: David B. Flinn
    __________________________________________________________________________________
    Counsel:
    Mastagni Holstedt, Mastagni, Holstedt, Amick, Miller & Associates, David P. Mastagni, David E.
    Mastagni and Isaac S. Stevens for Plaintiffs and Appellants Alameda County Deputy Sheriff’s Association,
    Jon Rudolph, Rocky Medeiros, James Nelson and Darlene Hornsby.
    Leonard Carder, Peter Saltzman and Arthur Liou for Plaintiffs and Appellants Public Employees Union,
    Local 1, International Federation of Professional and Technical Engineers, Local 21, Alameda County
    Management Employees’ Association, David M. Rolley, Peter J. Ellis and Susan Guest.
    Rains, Lucia & Willinson, Rains Lucia Stern, St. Phalle & Silver, Rockne A. Lucia, Jr., Timothy K. Talbot,
    Steven M. Betz and Zachery A. Lopes for Plaintiffs and Appellants Contra Costa County Deputy Sheriffs
    Association and Ken Westermann.
    Weinberg, Roger & Rosenfeld, Anne I. Yen, Vincent A. Harrington, Jr. and Kerianne Steele for Plaintiffs
    and Appellants Service Employees International Union, Local 1021 and Building Trades Council of
    Alameda County.
    Bogatin Corman & Gold and William I. Corman for Plaintiffs and Appellants Physicians’ and Dentists’
    Organization of Contra Costa.
    Davis, Cowell & Bowe, McCracken, Stemerman & Holsberry and W. David Holsberry for Plaintiffs and
    Appellants United Professional Fire Fighters of Contra Costa County, Local 1230.
    Beeson, Tayer & Bodine, Beeson, Tayer, Silbert & Bodine, Robert Bonsall, Vishtasp Soroushian, Teague
    P. Paterson and Adrian Barnes for Plaintiffs and Appellants AFSCME Local 512, AFSCME Local 2700,
    Teamsters Local 856, Hasani Tabari, Sandra Gonzalez-Diaz and Daniel Lister.
    Bennett, Sharpe, Delarosa, Bennett & Licalsi, Law Offices of Bennett & Sharpe, Barry J. Bennett, Thomas
    M. Sharpe, Katwyn T. DeLaRosa for Plaintiffs and Appellants American Federation of State, County and
    Municipal Employees, Local 2703, AFL-CIO, Merced County Sheriff’s Association, an affiliate of
    International Brotherhood of Teamsters, Local 856, Jeffrey Miller and Mary McWatters.
    Messing Adam & Jasmine, Gary M. Messing, Gregg McLean Adam and Yonatan L. Moskowitz for CAL
    FIRE, Local 2881, California Correctional Peace Officers Association, Peace Officers Research
    Association of California, California Statewide Law Enforcement Association, San Francisco Police
    Officers’ Association, San Jose Police Officers’ Association, Fresno Deputy Sheriffs’ Association, Deputy
    Sheriffs’ Association of Santa Clara County, Marin Professional Firefighters, International Association of
    Fire Fighters, Local 1775, Association of California State Supervisors, San Francisco Municipal
    Executives’ Association, San Francisco Deputy Probation Officers’ Association, Sunnyvale Public Safety
    Officers’ Association, Superior Court Professional Employees’ Association of the County of Santa Clara,
    Sacramento County Professional Accounts Association, City of Fremont Employees’ Association,
    Redwood City Management Employees’ Association, Burlingame Police Officers’ Association and
    California State Retirees as Amici Curiae on behalf of Plaintiffs and Appellants.
    Reich, Adell & Cvitan, Marianne Reinhold, Laurence S. Zakson and Aaron G. Lawrence for Orange
    County Attorneys Association and Orange County Managers Association as Amici Curiae on behalf of
    Plaintiffs and Appellants.
    Law Offices of Robert J. Bezemek, Robert J. Bezemek and David Conway for the Peralta Retirees
    Organization, the California Community Colleges Independents’ Organization and the Faculty Association
    of the California Community Colleges as Amici Curiae on behalf of Plaintiffs and Appellants.
    Reed Smith, Harvey L. Leiderman, Jeffrey R. Rieger and May-tak Chin for Defendants and Respondents
    Alameda County Employees’ Retirement Association and Contra Costa County Employees’ Retirement
    Association and their respective Boards of Retirement.
    Nossaman, Ashley K. Dunning, Peter H. Mixon, Robert L. Gaumer, Michael V. Toumanoff, Jill N. Jaffe,
    Natasha Saggar Sheth and Jennifer Meeker for Defendants and Respondents Merced County Employees’
    Retirement Association and Merced County Employees’ Retirement Association Board of Retirement.
    Kamala D. Harris and Xavier Becerra, Attorneys General, Douglas J. Woods and Thomas S. Patterson,
    Assistant Attorneys General, Constance L. LeLouis and Anthony P. O'Brien, Deputy Attorneys General,
    Peter Krause, Legal Affairs Secretary, Rei R. Onishi, Deputy Legal Affairs Secretary for Intervener and
    Appellant State of California.
    Jones Day, Beth Heifetz, G. Ryan Snyder and Karen P. Hewitt for California Business Roundtable as
    Amicus Curiae on behalf of Intervener and Appellant State of California.
    Colantuono, Highsmith & Whatley, Michael G. Colantuono and Liliane M. Wyckoff for League of
    California Cities as Amicus Curiae on behalf of Intervener and Appellant State of California.
    Meyers, Nave, Riback, Silver & Wilson, Richard D. PioRoda, Kenton L. Alm; Renee Sloan Holtzman
    Sakai; Renee Public Law Group, Linda M. Ross and Randy Riddle for Real Party in Interest Central Contra
    Costa Sanitary District.
    Atkinson, Andelson, Loya, Ruud & Romo, Anthony P. De Marco and Joshua E. Morrison for Association
    of California School Administrators as Amicus Curiae.
    Greines, Martin, Stein & Richland and Timothy T. Coates for Los Angeles County Employees Retirement
    Association as Amicus Curiae.
    Counsel who argued in Supreme Court (not intended for publication with opinion):
    Rei Onishi
    Office of Governor Gavin Newsom
    State Capitol, Suite 1173
    Sacramento, CA 95814
    (916) 445-0873
    David E. Mastagni
    Mastagni Holstedt
    1912 I Street
    Sacramento, CA 95811
    (916) 446-4692
    Timothy K. Talbot
    Rains Lucia Stern St. Phalle & Silver
    2300 Contra Costa Blvd., Suite 500
    Pleasant Hill, CA 94523
    (925) 609-1699