melinda-may-vitzthum-plaintiff-appellantcross-appellee-v-klm-acquisition ( 2014 )


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  •                    IN THE COURT OF APPEALS OF IOWA
    No. 13-1441
    Filed October 1, 2014
    MELINDA MAY VITZTHUM,
    Plaintiff-Appellant/Cross-Appellee,
    vs.
    KLM ACQUISITION CORPORATION, d/b/a ALUMA, LTD. and LIBERTY
    MUTUAL FIRE INSURANCE, a/k/a LM INSURANCE CORPORATION,
    Defendant-Appellees/Cross-Appellants.
    ________________________________________________________________
    Appeal from the Iowa District Court for Polk County, Robert B. Hanson,
    Judge.
    Melinda Vitzthum appeals and Aluma, her employer, cross-appeals from
    the district court’s orders regarding the Iowa Workers’ Compensation
    Commission’s final disposition on Vitzthum’s compensation petition and appeal.
    AFFIRMED.
    Mark S. Soldat of Soldat & Parrish-Sams, P.L.C., West Des Moines, for
    appellant/cross-appellee.
    Amanda M. Phillips of Law Offices of James W. Nubel, Omaha, NE, for
    appellees/cross-appellants.
    Heard by Potterfield, P.J., and Tabor and Mullins, JJ.
    2
    POTTERFIELD, P.J.
    Melinda Vitzthum appeals from the district court, which affirmed in part
    and remanded in part the proceedings before the Iowa Workers’ Compensation
    Commission.     The defendants, KLM Acquisition Corp.—doing business as
    Aluma, Ltd.—and its insurer, Liberty Mutual Fire Insurance (collectively, “Aluma”)
    cross-appeal.   Together they raise five issues: (1) the correct rate of weekly
    benefits to which Vitzthum is entitled; (2) whether Aluma has a reasonable or
    probable cause or excuse to avoid penalties for late payments; (3) whether
    Aluma has a reasonable or probable cause or excuse to avoid penalties for
    underpayments; (4) whether the district court was correct to remand for
    additional fact-finding; and (5) whether the assessment of arbitration and court
    costs below was proper.
    I. Factual and Procedural Background
    Vitzthum was injured at work on June 30, 2008. Aluma agreed to pay
    healing period benefits, calculated the rate of those benefits at $292.65 per
    week, and began issuing checks based on that calculation on July 10, 2008. A
    regular ongoing weekly payment schedule had solidified by the end of August
    2008. Vitzthum initially accepted the weekly checks without dispute.
    On June 25, 2010, Vitzthum filed a petition for arbitration before the Iowa
    Workers’ Compensation Commission. Part of the petition involved a claim for a
    higher weekly benefits rate—$305.29—to be applied prospectively and
    retroactively. Another element of the petition was a claim for additional benefits
    assessed as penalties against Aluma on three bases: first, for making late
    payments; second, for paying less than the proper benefit rate; and third, for
    3
    “underpayments resulting from payments insufficient to satisfy both the accrued
    interest and principal of compensation.”
    In its arbitration decision, the commission held that the correct weekly
    benefit rate was $298.39. It ordered that Aluma pay twenty-five percent of the
    total amount underpaid as a penalty.           It denied Vitzthum’s other bases for
    penalties. Vitzthum appealed before the commission. In the appeal decision by
    the designated appellate deputy commissioner, the commission held the weekly
    benefit rate should in fact have been $305.29 (as Vitzthum claimed) from the
    outset. However, it reversed the previous assignment of penalty benefits and
    instead ruled that Vitzthum was not entitled to penalties under any of her three
    theories.
    Vitzthum filed for judicial review in the district court. The district court
    affirmed the weekly benefit rate of $305.29 and remanded for further fact-finding
    on the issue of penalty benefits based on the underpayment of the correct weekly
    rate for payments made on or after July 1, 2009, the date an amendment to the
    Iowa Code provision regarding penalties became effective.          See Iowa Code
    § 86.13(4)(c) (2011).    The district court affirmed all other aspects of the
    commissioner’s holdings regarding penalty benefits and the calculation of the
    weekly benefit rate.    Vitzthum appeals, asserting error in the district court’s
    affirmance of the denial of her other claims for penalties and in the assignment of
    costs. Aluma cross-appeals, claiming the district court’s remand for further fact-
    finding on the issue of penalties was improper and the commission’s calculation
    of a weekly benefit rate of $305.29 was in error.
    4
    II. Standard and Scope of Review
    Our review of agency action is for correction of errors at law. Finch v.
    Schneider Specialized Carriers, Inc., 
    700 N.W.2d 328
    , 330 (Iowa 2005). We
    apply the standards of Iowa Code section 17A.19(10) to the agency’s decision
    and compare our conclusion with the conclusion of the district court.
    Grundmeyer v. Weyerhaeuser Co., 
    649 N.W.2d 744
    , 748 (Iowa 2002). “If they
    are the same, we affirm; otherwise we reverse.” 
    Id. We are
    “bound by [the agency’s] fact-finding if it is supported by
    substantial evidence.” Asmus v. Waterloo Cmty. Sch. Dist., 
    722 N.W.2d 653
    ,
    657 (Iowa 2006); see Iowa Code § 17A.19(10)(f). Evidence is substantial when it
    is “the quantity and quality of evidence that would be deemed sufficient by a
    neutral, detached, and reasonable person, to establish the fact at issue when the
    consequences resulting from the establishment of that fact are understood to be
    serious and of great importance.” Iowa Code § 17A.19(10)(f)(a). “[T]he question
    on appeal is not whether the evidence supports a different finding than the
    finding made by the commissioner, but whether the evidence supports the
    findings actually made.” Meyer v. IBP, Inc., 
    710 N.W.2d 213
    , 218 (Iowa 2006).
    III. Discussion
    We first address Aluma’s claim on cross-appeal that the appellate deputy
    commissioner’s calculation of benefits was erroneous.        We then consider
    whether Vitzthum is entitled to penalty benefits on the theories she puts forward
    on appeal. We consider the issue on cross-appeal of the district court’s limited
    remand on the issue of underpayment penalties simultaneously with Vitzthum’s
    5
    claim that the district court’s remand should be expanded. We finally consider
    the assessment of costs to the parties.
    A. Calculation of Benefits
    Aluma asserts on cross-appeal that the district court erred by affirming the
    commission’s holding that Vitzthum’s weekly benefit rate payable is $305.29
    instead of Aluma’s calculated rate of $292.65 per week.                  Aluma rests its
    argument on a single case decided by the commission, which stands for the
    proposition that some employers allow unusual employee weekly schedules that
    elude sensible outcomes under the typical statutory calculations. See Daniels v.
    T & L Cleaning Servs., File No. 1283486, 
    2002 WL 32125261
    , at *1 (Iowa
    Workers’ Comp. Comm’n Oct. 8, 2002).
    However, we agree with the appellate deputy commissioner, who stated: “I
    do not see much evidence in the record to show that [Aluma’s] practice is all that
    unusual.” Even though Aluma’s practice of offering additional personal days may
    theoretically be conceptualized as offsetting employees’ overtime, that offset is
    not so unusual that the statutory calculus does not reach a sound conclusion as
    to the proper weekly rate. Therefore, the usual calculation method found in Iowa
    Code section 85.36(6) still controls.1
    1
    Iowa Code § 85.36(6) provides,
    In the case of an employee who is paid on a daily or hourly basis, or by
    the output of the employee, the weekly earnings shall be computed by
    dividing by thirteen the earnings, including shift differential pay but not
    including overtime or premium pay, of the employee earned in the employ
    of the employer in the last completed period of thirteen consecutive
    calendar weeks immediately preceding the injury. If the employee was
    absent from employment for reasons personal to the employee during
    part of the thirteen calendar weeks preceding the injury, the employee’s
    weekly earnings shall be the amount the employee would have earned
    had the employee worked when work was available to other employees of
    6
    The appellate deputy commissioner’s conclusions of law offer a sound
    explanation of his reasons for independently reaching the calculated amount.
    That evidence includes the fact that three of the thirteen weeks prior to
    Vitzthum’s injury were non-representative weeks because she took time off.
    Additionally, the appellate deputy commissioner corrected calculation errors that
    occurred in the initial commission proceedings as a result of including premium
    overtime pay.
    Even if his calculations were to differ from those of either or both of the
    parties, there remains substantial evidence in the record to support his
    conclusion. We affirm the district court and decline to disturb the commission’s
    final conclusion on the proper weekly benefit rate and resulting amount past
    due.2
    B. Penalty Benefits—Reasonable or Probable Cause or Excuse
    In Vitzthum’s first two issues on appeal, she ascribes error to the district
    court’s affirmance of the denial of penalty benefits. She alleges Aluma made
    every benefit payment past its due date and underpaid those benefits due to its
    erroneous benefit rate calculation. She asserts Aluma must pay penalty benefits
    because there was no showing of a reasonable excuse for the delay or
    underpayment that would insulate Aluma from mandatory penalties. On cross-
    appeal, Aluma asserts the district court’s remand for further fact-finding regarding
    the employer in a similar occupation. A week which does not fairly reflect
    the employee’s customary earnings shall be replaced by the closest
    previous week with earnings that fairly represent the employee’s
    customary earnings.
    2
    The appellate commissioner held, “At the time of the hearing, the amount due was
    $2233.32 and interest due on that amount accrues at the rate of $.6119 per day from the
    date of the hearing on April 11, 2011. This will be awarded.”
    7
    potential penalty benefits resulting from underpayments made on or after July 1,
    2009 should be vacated.
    1. Applicable Law
    Iowa Code section 86.13(4)(a) provides,
    If a denial [or] a delay in payment . . . of benefits occurs without
    reasonable or probable cause or excuse known to the employer or
    insurance carrier at the time of the denial [or] delay . . . , the
    workers’ compensation commissioner shall award [penalty]
    benefits . . . up to fifty percent of the amount of benefits that were
    denied [or] delayed . . . without reasonable or probable cause or
    excuse.
    For penalties to be assessed, the employee must first affirmatively show
    that there has been a delay in payment or a denial of benefits. Keystone Nursing
    Care Ctr. v. Craddock, 
    705 N.W.2d 299
    , 307 (Iowa 2005). Then the burden
    shifts to the employer to prove a reasonable or probable cause or excuse for the
    delay. Schadendorf v. Snap-On Tools Corp., 
    757 N.W.2d 330
    , 334–35 (Iowa
    2008).
    A reasonable or probable cause or excuse exists if either “(1) the delay
    was necessary for the insurer to investigate the claim or (2) the employer had a
    reasonable basis to contest the employee's entitlement to benefits.” IBP, Inc. v.
    Burress, 
    779 N.W.2d 210
    , 222 (Iowa 2010) (quoting Christensen v. Snap-On
    Tools Corp., 
    554 N.W.2d 254
    , 260 (Iowa 1996)). “A reasonable basis for denial
    of the claim exists if the claim is fairly debatable.” 
    Id. (quotations omitted).
    A
    claim is fairly debatable “when it is open to dispute on any logical basis.” Rodda
    v. Vermeer Mfg., 
    734 N.W.2d 480
    , 483 (Iowa 2007) (emphasis added). Whether
    8
    a claim is fairly debatable may be determined as a matter of law. 3 
    Id. It is
    irrelevant whether the employer’s basis for the delay or denial is correct in the
    final legal analysis; rather, “[t]he issue is whether there was a reasonable basis
    for the employer’s position that no benefits were owing.” 
    Craddock, 705 N.W.2d at 308
    .
    Even if the employer’s basis was not objectively reasonable, we must
    nevertheless determine whether it “knew, or should have known, that the basis
    for denying the employee’s claim was unreasonable” before assigning penalties
    under section 86.13. 
    Rodda, 734 N.W.2d at 483
    ; see Burton v. Hilltop Care
    Center, 
    813 N.W.2d 250
    , 267 (Iowa 2012). The requirement that the employer
    must have known or should have known that its basis for delaying payment or
    underpaying was unreasonable is a by-product of Iowa courts’ interpretation of
    section 86.13 incorporating a bad faith standard from tort law. See City of Madrid
    v. Blasnitz, 
    742 N.W.2d 77
    , 81–82 (Iowa 2007) (citing 
    Christensen, 554 N.W.2d at 260
    ). “Courts . . . do not weigh the conflicting evidence that was before the
    insurer; they decide whether evidence existed to justify denial of the claim.” 
    Id. (citations omitted).
    “The purpose or goal of the statute is both punishment and
    deterrence.” Robbennolt v. Snap-On Tools Corp., 
    555 N.W.2d 229
    , 237 (Iowa
    1996). Our case law makes clear that the intended punishment and deterrence
    is for employers or insurers that attempt to escape or lessen their payments to
    injured workers in bad faith. See 
    Blasnitz, 742 N.W.2d at 82
    .
    3
    Aluma has never contested Vitzhum’s entitlement to benefits. The “fairly debatable”
    discussion in this case therefore relates to its calculation of the amount of benefits and
    dates of payment.
    9
    On July 1, 2009, after Vitzthum began receiving benefits, an additional
    provision added to section 86.13 came into effect. Iowa Code section 86.13(4)(c)
    adds three statutory requirements to the employer’s burden of proof when an
    employer or insurance carrier asserts a reasonable or probable cause or excuse:
    (1) The excuse was preceded by a reasonable investigation and
    evaluation by the employer or insurance carrier into whether
    benefits were owed to the employee.
    (2) The results of the reasonable investigation and evaluation were
    the actual basis upon which the employer or insurance carrier
    contemporaneously relied to deny [or] delay payment
    of . . . benefits.
    (3) The employer or insurance carrier contemporaneously
    conveyed the basis for the denial [or] delay in payment . . . of
    benefits to the employee at the time of the denial [or] delay . . . .
    The payments made to Vitzthum in this case commenced before and continued
    beyond this statute’s effective date. Because there is no contrary case law or
    legislative intent apparent, these additional requirements are “presumed to be
    prospective in [their] operation.” Iowa Code § 4.5.
    2. Delay in Payment of Benefits
    Vitzthum asserts she has “proved without contradiction the elements
    necessary to prove Aluma did not make timely compensation payments.” She
    claims Aluma must pay penalty benefits because every payment made since its
    second payment has been delayed.4 Aluma, on the other hand, asserts Vitzthum
    has not met her initial burden of proof. It asserts the record is sufficient to show
    that it has made all its payments on time according to its reasonable (or at least
    fairly debatable) calculation of amounts due.
    4
    Vitzthum claims “186 payment delays of 9153 days” and a total of $41,024.81 in
    delayed payments.
    10
    After Vitzthum’s first hearing before the commission, the deputy
    commissioner held that there was no delay in payments because she believed
    Vitzthum’s “request for penalty appears premised on the concept that payments
    are made when the check is received versus when the check is mailed.” On
    appeal before the commission, the appellate deputy stated, “I [] do not see where
    defendants untimely paid its version of the weekly benefits and due dates.” On
    judicial review, the district court’s ruling on Vitzthum’s assertions of delay
    apparently considered only the claim that the payments were delayed because
    they were not paid in full as a result of Aluma’s miscalculations. Vitzthum’s
    position is that there was an actual delay plus a miscalculation. We reach both
    issues and arrive at the same result as the district court.
    There are two unique characteristics of Vitzthum’s claim that made it
    difficult for the commission and district court to respond: (1) her unilaterally
    declared due dates and (2) the prospective application of benefit and interest due
    dates to develop post facto a rolling delay from each benefit period to the next.
    First, Vitzthum has presented in various iterations and at various stages of
    the proceedings copious tabular data to express her opinion as to the due date of
    each payment. At no stage in the proceedings has the commission or the court
    expressed any formal approval or adoption of these dates in their findings of fact
    or conclusions of law.5     Vitzthum claims her asserted due dates have been
    5
    The appellate deputy commissioner did “adopt” Vitzthum’s calculated benefit rate and
    total amount owing. Vitzthum declares, “By approving [Vitzthum’s computations of the
    amount of benefit payments and resulting underpayment], the appeal deputy necessarily
    found the correctness of the due dates used in them.” We find this assertion
    unpersuasive. The appellate deputy commissioner issued no ruling as to Vitzthum’s due
    dates; he only concluded that the total amount due by his calculations was the same as
    the amount Vitzthum had put forward. Additionally, this is the same deputy that denied
    11
    calculated according to the dictates of 
    Robbennolt, 555 N.W.2d at 234
    –36. She
    fails, however, to demonstrate how the language of Robbennolt mandates the
    precise due dates she asserted. Robbennolt requires “weekly compensation [to
    be] timely paid at the end of each compensation week.” 
    Id. at 235.
    “[W]eekly
    compensation payments are ‘made’ when they are mailed to the claimant.” 
    Id. Aluma’s payment
    schedule involved issuing a check to Vitzthum at the
    end of a calendar week.       For example, on Friday, October 24, 2008, Aluma
    issued a check for the payment of benefits accrued from Monday, October 20,
    2008, to Sunday, October 26, 2008.          This squarely meets the description of
    timely payment in Robbennolt. 
    Id. However, according
    to Vitzthum’s calculations each weekly payment
    should have accrued from Thursday of each week (e.g. October 16, 2008) to
    Wednesday of the following week (e.g. October 22, 2008). It is not clear from the
    record why Vitzthum rejects Aluma’s Monday-to-Sunday weekly payment and
    instead demands payment on a Thursday-to-Wednesday basis.6                    Because
    Vitzthum has failed to support her unilaterally declared due dates with any
    particularized legal citation or factual assertion, we find that Aluma’s payment
    scheme comports with Robbennolt.
    Second, Vitzthum alleges every payment made by Aluma was delayed
    due to a disagreement (and possible error) regarding benefits owed in the six
    delay penalty benefits because he did “not see where defendants untimely paid its
    version of the weekly benefits and due dates.” That deputy therefore in fact rejected
    Vitzthum’s purported due dates insofar as he held they do not bear upon the issue of
    delay penalties.
    6
    In one of Vitzthum’s many data tables, she calculates the weeks for which benefits are
    due. In her appeal brief to the commission, she includes a column entitled “7-day
    Week,” and that column lists eight seven-day weeks and—without explanation—
    calculations for two five-day “weeks,” a four-day “week,” and a two-day “week.”
    12
    weeks immediately following the injury.7 According to Vitzthum, the asserted
    error created a rolling delay for each subsequent payment. For example, Aluma
    specifically denoted the check issued on October 24, 2008, as payment for the
    week of October 20, 2008. But Vitzthum asserts it was in fact a late payment for
    benefits that were due and unpaid on October 2, 2008. In this way, Vitzthum
    characterizes every payment made as a payment on benefits already owing and
    past due.    Based on that theory, Vitzthum retroactively accrues each benefit
    period as a future debt rather than a contemporaneous payment from Aluma.
    There is no indication Vitzthum believed this rolling late payment scheme
    was in effect as she received the payments. On the facts of this case, Vitzthum’s
    “rolling delay” concept casts the impression of a litigation strategy designed to
    maximize potential penalty benefits. But we find no support for such a concept in
    our law, and indeed, Vitzthum has not cited any.8
    On the theory presented,9 Vitzthum has failed to meet her initial burden of
    proof that there was an unexcused delay in payment of benefits. Each payment
    Aluma made corresponds with the work week for which it was issued—the
    7
    Vitzthum’s calculations are presented in tabular data, but the design of the tables
    makes it difficult to compare her calculated benefits with those actually paid. The record
    indicates that the alleged errors in benefits payments made soon after her injury related
    to Vitzthum’s claimed temporary partial benefits periods. Aluma issued benefit
    payments that coincide with all of her claimed healing period benefits.
    8
    Vitzthum makes generalized gestures towards the United States rule, but that rule only
    applies “regarding allocation of interest when payment is made toward retiring a
    judgment.” 
    Christensen, 554 N.W.2d at 261
    –62 (emphasis added). Vitzthum’s
    reference to the rule may serve as a sufficient analogy for her rolling delay concept, but
    it is not applicable law on these facts. Aluma’s benefit payments were not made toward
    retiring a judgment upon which interest had begun to accrue.
    9
    We note Vitzthum may have had a valid claim for a delay in payment relative to
    temporary partial benefits owed and unpaid for the periods of July 7 to July 28, 2008,
    and August 2 to August 17, 2008. However, she has not presented that claim, relying
    instead on her rolling delay penalty theory.
    13
    payments cannot be considered back-payments toward a running balance of
    which neither Aluma nor Vitzthum herself had any knowledge.
    Even assuming arguendo that we could recognize the rolling delay as a
    proper basis for penalty benefits on these facts, we note that Aluma’s belief its
    payments were timely and complete constitutes a reasonable excuse. It was
    fairly debatable that the Monday-through-Friday payment system comports with
    the law in Robbennolt. Because there is substantial evidence in the record to
    support the district court’s implicit affirmance of the commissioner’s denial of
    these penalty benefits, we affirm.
    3. Underpayment of Benefits
    Vitzthum also asserts Aluma must pay penalty benefits due to the de facto
    denial of benefits owed as a result of Aluma’s incorrect calculation of the correct
    benefit rate.10 The commission did not award penalty benefits on this basis,
    finding that Aluma had demonstrated a reasonable excuse for its underpayment
    because it had a fairly debatable basis for its computations. The district court
    agreed that the basis for Aluma’s computation was fairly debatable and that it
    therefore was not subject to penalty benefits for all benefits paid prior to the
    statutory amendment’s effective date on July 1, 2009.                The district court
    remanded to the commission the issue of possible penalty benefits owed on
    benefits paid after the statutory amendment went into effect, as the applicable
    law included additional burdens of proof on Aluma under Iowa Code section
    86.13(4)(c).
    10
    Vitzthum calculates the total amount of unpaid principal as $1832.27 by multiplying the
    difference between her calculated weekly benefit rate and Aluma’s rate by the number of
    weeks paid.
    14
    On appeal, Vitzthum argues that there was not a fairly debatable basis for
    Aluma’s underpayments prior to July 1, 2009, subjecting it to penalty benefits for
    both pre- and post-amendment underpayments. On cross appeal, Aluma argues
    its fairly debatable basis was sufficient to obviate Vitzthum’s claim for penalty
    benefits even under the new statutory requirements, rendering the district court’s
    remand to the commission unnecessary.        In other words, the district court’s
    remand suggests some of the benefit underpayments may be subject to penalty;
    Vitzthum argues that all of the benefit underpayments are subject to penalty;
    Aluma argues that none of the benefit underpayments are subject to penalty.
    Since the commission held that Aluma’s calculations were indeed
    erroneous, Vitzthum has satisfied her burden to demonstrate there was a denial
    of benefits. Our analysis, therefore, is Aluma’s burden to show a reasonable or
    probable cause or excuse for the underpayments.
    As to the pre-amendment benefits, we agree with the district court that the
    assessment of penalty benefits is not justified. Aluma had a reasonable basis for
    paying Vitzthum its calculated rate of $292.65 per week, because relevant
    authority could have led it to believe the thirteen weeks upon which it based its
    calculations formed a proper basis even though Vitzthum’s actual work hours
    fluctuated both above and below forty hours a week with some regularity. See
    Daniels, 
    2002 WL 32125261
    , at *1 (holding where “earnings varied greatly from
    week to week due to available work[, t]he most appropriate method to calculate []
    customary earnings was to average them over the previous 13 weeks before the
    injury as done by the defense”).
    15
    Vitzthum misstates the applicable law when she insinuates Aluma is
    subject to penalties because there was not “any ‘debate,’ let alone a ‘fair debate’”
    regarding its rate computation method. This is not what the law requires. The
    law requires that Aluma’s reason for its rate computation method be “fairly
    debatable.” 
    Burress, 779 N.W.2d at 222
    . We agree with the commission and
    with the district court that—regardless of its ultimate correctness—Aluma had a
    fairly debatable basis for its rate of benefit payments made to Vitzthum before
    July 1, 2009. 11
    As to the post-amendment benefits, we agree with the district court that
    the deputy commissioner failed to analyze the three requirements of section
    86.13(4)(c). Furthermore, we note the deputy failed to satisfactorily analyze the
    effect of the prospective nature of the 2009 amendments. The deputy applied
    only the pre-amendment requirements to the facts.12
    On judicial review, the district court relied on a footnote in Burton to
    suggest the additional requirements may apply to individual post-amendment
    payments.     
    Burton, 813 N.W.2d at 267
    , n.4.           Aluma, however, argues the
    prospective nature of the amendments should relate to the date of the predicate
    11
    Vitzthum’s characterization of Aluma’s reasonable or probable cause or excuse for
    underpayment (i.e. fairly debatable miscalculation) as an ex post facto excuse
    manufactured during litigation to avoid liability is unpersuasive. The miscalculation
    occurred at the outset of Aluma’s payment regime in July 2009. Whether Aluma’s
    calculations were disclosed when it began payments or during these proceedings, the
    excuse is not ex post facto because those calculations existed at the outset of the
    compensation period.        The “excellent, recurring, and timely question” regarding
    legislative intent and ex post facto excuses that Vitzthum raises in the routing statement
    of her appellate brief is not actually implicated by the facts of the case before us.
    12
    The appellate deputy commissioner’s decision indicates some confusion as to the
    timing of the injury and the effective date of the amended legislation, which resulted in
    the application of the pre-amendment law to the post-amendment benefit payments
    without consideration of the effect of the amendment.
    16
    injury rather than the dates of individual payments.13               Under Aluma’s
    interpretation of the amendment, the new requirements do not apply to any of the
    payments in this case because Vitzthum’s injury occurred prior to the
    amendment’s effective date. The district court’s interpretation of the statute, on
    the other hand, would alter the burden of Aluma’s payment obligations mid-
    performance.
    There are three requirements under the post-amendment law of a
    reasonable or probable cause or excuse for underpayment. First, Aluma must
    have undertaken a “reasonable investigation” to determine what benefits it owed
    to Vitzthum.       Iowa Code § 86.13(4)(c)(1).        Second, Aluma must have
    “contemporaneously relied” on the results of that investigation as the “actual
    basis” for its underpayments.      
    Id. § 86.13(4)(c)(2).
      Third, Aluma must have
    “contemporaneously conveyed the basis for the denial [] of benefits to the
    employee at the time of the denial . . . .”        
    Id. § 86.13(4)(c)(3).
         If these
    requirements are applicable, the commission must make sufficient findings of fact
    to support them.
    Because the commission’s conclusions of law do not sufficiently determine
    the effect of the 2009 amendments and its findings of fact do not determine any
    attendant substantive satisfaction of the post-amendment requirements, we
    agree with the district court that the case must be remanded for further
    proceedings to interpret the effect of the 2009 amendments and for a disposition
    13
    Aluma notes that Burton is factually distinguishable because every individual payment
    occurred prior to the effective date of the amended legislation. 
    Burton, 813 N.W.2d at 267
    , n.4. However, the footnote suggests the amendments would have changed the
    employer’s burden for payments after the effective date. In this case, individual
    payments were issued both before and after the amendment went into effect.
    17
    on the matter of penalty benefits for underpayments made on or after July 1,
    2009.
    C. Assignment of Costs
    In compensation cases, “[a]ll costs incurred in the hearing before the
    commissioner shall be taxed in the discretion of the commissioner.” 
    Id. § 86.40.
    If the case is later subject to judicial review, “[t]he taxation of costs on judicial
    review shall be in the discretion of the court.” 
    Id. § 86.32.
    We therefore review
    for abuse of discretion. 
    Robbennolt, 555 N.W.2d at 238
    .
    We find that neither the commission nor the district court abused their
    discretion in their assignment of costs. Vitzthum contends that 
    Robbennolt, 555 N.W.2d at 238
    , and Solland v. Second Injury Fund of Iowa, 
    786 N.W.2d 248
    , 249
    (Iowa 2010),14 mandate remand to the commission for recalculation of costs
    based on her success on the merits. However, neither case issues or references
    any such mandate. We find re-taxation on remand unnecessary.
    It is true that, in principle, the relative success of the parties should be
    considered when assigning costs. 
    Robbennolt, 555 N.W.2d at 238
    . Both the
    commission and the district court appropriately did so. Before the commission,
    Vitzthum was successful on some claims (i.e., the weekly healing period rate
    calculus) and unsuccessful on the others (i.e., her penalty benefit claims). The
    commission appropriately divided the costs equally.
    14
    We note that the Solland court considered the taxation of costs pursuant to Iowa Code
    section 625.1 (“Costs shall be recovered by the successful against the losing party.”), so
    its reasoning is inapposite in this case. Here, costs were taxed according to Iowa Code
    section 625.3 (“Where the party is successful as to a part of the party's demand, and
    fails as to part, unless the case is otherwise provided for, the court on rendering
    judgment may make an equitable apportionment of costs.”).
    18
    At the district court level, her success was a very narrow remand.
    Because she was only partially successful, the district court has great discretion
    in dividing costs.   See Lake v. Schaffnit, 
    406 N.W.2d 437
    , 442 (Iowa 1987)
    (holding the district court’s assignment of 100% of costs to the defendant proper
    despite the fact that he was successful in ascribing 49% of the fault to the
    plaintiff); see also Iowa Code § 625.3 (“Where the party is successful as to a part
    of the party's demand, and fails as to part, . . . the court on rendering judgment
    may make an equitable apportionment of costs”).               The district court’s
    apportionment of costs accounts for the fact that Vitzthum’s was relatively
    unsuccessful on judicial review; her petition was denied as to all but the narrow
    remand.
    Neither the agency nor the district court abused their wide discretion to
    assign costs because neither party entirely prevailed. To reassess those costs
    or to allow Vitzthum to reargue these assignments on remand would be to allow
    her to attempt to recover costs on her multitude of rejected petitions and motions.
    All heretofore taxed costs are affirmed. Each party is to bear its own costs of this
    appeal.
    IV. Conclusion
    We agree with the district court and find there is substantial evidence
    supporting the appellate deputy commissioner’s final disposition on most issues
    presented.    First, we find there is substantial evidence supporting the
    commissioner’s final calculation of the proper weekly benefit rate and amount
    due.   Second, there is substantial evidence supporting the appellate deputy
    commissioner’s denial of penalty benefits based on a theory of delayed
    19
    payments. Third, there is substantial evidence supporting the appellate deputy
    commissioner’s denial of penalty benefits based on a theory of underpayment for
    benefits paid prior to July 1, 2009.     Fourth, all assignment of costs by the
    commission and the district court were proper and within their discretion. We
    affirm.
    However, we find there is not yet sufficient evidence to support the
    appellate deputy commissioner’s denial of penalty benefits based on a theory of
    underpayment for benefits paid on or after July 1, 2009. The commission must
    explicitly interpret the effect of the 2009 amendments relative to the facts of this
    case and then expand its findings of fact to coincide with the applicable rule of
    law. We affirm the district court’s order to remand for further proceedings.
    AFFIRMED.