Northern States v. United States ( 1998 )


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  •                      United States Court of Appeals
    FOR THE EIGHTH CIRCUIT
    ___________
    No. 97-2914/2915
    ___________
    Northern States Power Company,         *
    *
    Cross-Appellant/Appellee, *
    * Appeals from the United States
    v.                               * District Court for the
    * District of Minnesota.
    United States of America,              *
    *
    Appellant/Cross-Appellee. *
    ___________
    Submitted: March 12, 1998
    Filed: August 12, 1998
    ___________
    Before WOLLMAN and HANSEN, Circuit Judges, and GOLDBERG,1 Judge.
    ___________
    GOLDBERG, Judge.
    This tax refund dispute raises two independent issues. First, when did the
    taxpayer, Northern States Power Co. ("NSP"), place two shipments of nuclear fuel
    assemblies into service, and thereby become eligible to claim a depreciation
    deduction and an investment tax credit? And second, when NSP filed refund claims
    currently deducting certain losses that it had previously capitalized, did NSP change
    its method of accounting? NSP filed this action to recover a refund for taxes levied
    1
    The Honorable Richard W. Goldberg, Judge, United States Court of
    International Trade, sitting by designation.
    and collected by the Internal Revenue Service ("IRS") for the years 1985 and 1986.
    With respect to the first issue, involving the nuclear fuel assemblies, NSP argued
    that the fuel assemblies were placed in service when NSP acquired them because
    they were fully assembled and destined for use in an existing nuclear power plant.
    With respect to the second issue, involving the method of accounting, NSP argued
    that it did not change its method of accounting when it filed refund claims changing
    how it treated certain contract losses; rather, it was merely correcting mistakes on
    its 1985 and 1986 tax returns.
    After referring the matter to a magistrate judge, the district court granted
    summary judgment in favor of NSP on the first issue, and in favor of the United
    States on the second issue. The parties cross-appeal. Appellant/cross-appellee-
    defendant United States contends that NSP could not claim a depreciation deduction
    and an investment tax credit for the nuclear fuel assemblies until NSP inserted them
    into the reactor core and used them to generate salable electric power.
    Appellee/cross-appellant-plaintiff NSP, in turn, continues to argue that it was
    correcting a mistake, and not changing its method of accounting, when it filed
    refund claims seeking to deduct certain contract losses instead of capitalizing them.
    We affirm in part and reverse and remand in part.
    I.
    The material facts are not in dispute. Because the pertinent facts for each
    issue are entirely separate, we first summarize the facts relating to the nuclear fuel
    assemblies issue and then the facts relating to the method of accounting issue.
    A.    The Nuclear Fuel Assemblies
    NSP owns and operates a nuclear electric power plant in Prairie Island,
    Minnesota. The Prairie Island plant has two nuclear reactors housed in separate
    -2-
    containment buildings, Prairie Island I and Prairie Island II. This case involves
    nuclear fuel assemblies that NSP purchased for Prairie Island I. Prairie Island I has
    a core composed of 121 individual fuel assemblies which must be replaced
    periodically. As a result, NSP operates Prairie Island I in ten to sixteen month
    cycles, shutting it down in between cycles for refueling and routine maintenance.
    These operating cycles are sequentially numbered. Hence, the first ten to sixteen
    months that Prairie Island I produced power is referred to as Cycle 1, the next ten to
    sixteen month period following refueling is referred to as Cycle 2, and so forth.
    Each fuel assembly generally lasts for three cycles before it must be removed and
    replaced. The removal and replacement of the fuel assemblies is staggered: that is,
    at the end of each operating cycle, NSP replaces the oldest-third of the reactor's fuel
    assemblies with new fuel assemblies. Thus, for each cycle the core is composed of
    one-third new fuel assemblies, and two-thirds partially-used fuel assemblies. This
    case involves fuel assemblies that NSP purchased for Cycle 11 and Cycle 12.
    NSP schedules the shut downs well in advance, i.e., at least one year. The
    shut downs usually last anywhere from five to seven weeks. Once the reactor is
    shut down, the refueling process can begin. Briefly, it includes the following steps:
    new fuel assemblies are moved from the "new fuel pit" to the "spent fuel pool"; the
    reactor is cooled; the reactor head is removed; one-third of the spent (used) fuel
    assemblies are removed and stored in the spent fuel pool; the core is reconfigured
    using the remaining fuel assemblies according to a predetermined design; the new
    fuel assemblies are inserted into the core at specified locations; and the reactor head
    is replaced. Once this process and any needed maintenance are completed, the
    reactor is then ready to undergo "startup physics testing." Startup physics testing
    verifies that the fuel assemblies, both new and old, are properly positioned in the
    core and that the core design meets certain technical specifications. Once
    everything is verified, the reactor returns to full operating status and a new cycle
    begins.
    -3-
    Between December 9 and 19, 1985, NSP received 40 new fuel assemblies
    from Westinghouse to be used in Cycle 11. The assemblies were fabricated
    according to detailed technical specifications provided to Westinghouse by NSP, and
    were delivered fully assembled. After NSP received the fuel assemblies, it stored
    them in the new fuel pit before moving them to the spent fuel pool. They were
    inserted into the reactor in the middle of March 1986, and the reactor reached full
    power on April 14, 1986. Because NSP viewed the fuel assemblies as placed in
    service in December 1985, NSP claimed both a depreciation allowance and an
    investment tax credit for them in 1985.
    Between December 12 and December 22, 1986, NSP received 44 new fuel
    assemblies from Westinghouse for use in Cycle 12. Again, NSP initially stored the
    fuel assemblies in the new fuel pit, and later moved them to the spent fuel pool.
    They were inserted into the reactor between April 9 and April 19, 1987. The reactor
    reached full power on June 1, 1987. Just as it had done the preceding year, NSP
    claimed both a depreciation allowance and an investment tax credit for the
    assemblies in the year that it received them from Westinghouse, this time in 1986.
    The IRS disallowed both the depreciation deductions and the investment tax
    credits for 1985 and 1986 that related to the nuclear fuel assemblies. Specifically,
    the IRS disallowed $2,061,819 of the total depreciation deduction and $1,446,891 of
    the investment tax credit for 1985, and $2,953,915 of the total depreciation
    deduction and $1,394,975 of the investment tax credit for 1986. NSP paid the
    additional tax and interest due, and timely filed claims with the IRS for a refund.
    After the IRS denied the claims, NSP commenced suit in the district court. There,
    the parties cross-moved for summary judgment. The district court referred the
    matter to a magistrate judge, who recommended granting summary judgment in favor
    of NSP on this issue. Specifically, the magistrate judge concluded that the fuel
    assemblies were placed in service when NSP acquired them from Westinghouse
    because at that point, the fuel assemblies were fully assembled, inspected, and ready
    -4-
    to be inserted into the reactor core. After reviewing the magistrate judge's report and
    recommendations, the district court agreed and granted summary judgment in favor
    of NSP on this issue. See Northern States Power Co. v. United States, 
    952 F. Supp. 1346
    , 1347 (D. Minn. 1997). The United States appeals.
    B.    The Method of Accounting for Contract Losses
    Nuclear power plants produce electricity by using nuclear fuel assemblies to
    generate a fission reaction. Nuclear fuel assemblies are composed of fuel rods
    containing individual uranium pellets. Uranium pellets are the end result of a
    complex process in which natural uranium is mined, converted into a gas, and
    enriched to increase the U235 isotope. The enriched gas is then piped into containers
    and shipped to the fuel assembly fabricator. The fuel assembly fabricator converts
    the enriched gas into uranium pellets, which are then used to make the fuel rods.
    The enrichment process is critical because natural uranium does not contain enough
    of the U235 isotope to create and sustain a fission reaction.
    Uranium is enriched at plants in the United States and Europe. These plants
    sell enriching services at a specified dollar amount for each "separative work unit" of
    service ("SWU"). A SWU reflects the processing work needed to enrich a unit of
    gas to a specified concentration of the U235 isotope. Beginning in the mid-1970s,
    NSP contracted with the Department of Energy's ("DOE") plant in Oak Ridge,
    Tennessee for its enrichment needs. These contracts were designed to secure NSP's
    projected enrichment needs well into the future at a fixed price per SWU. They
    were structured as "take or pay" contracts. That is, NSP was bound to pay for the
    SWUs whether it used them or not. In the mid-1980s, it became apparent that NSP
    had overestimated its enriched uranium needs, primarily because it abandoned plans
    to complete another nuclear power plant. At the same time, the worldwide price for
    enriched uranium fell below the contract price. Thus, in 1984, NSP found itself
    bound to take or pay for SWUs that it no longer needed at a price that greatly
    -5-
    exceeded the prevailing market price. Consequently, NSP began to sell or assign
    various amounts of the DOE SWUs to third parties in order to mitigate its losses.
    Nevertheless, NSP still lost $1,286,634 on these contracts in 1985 and $811,647 in
    1986. This case involves, how, for tax purposes, NSP treated these losses.2
    When the tax department at NSP prepared and filed NSP's tax returns for
    1984, 1985, and 1986, it was apparently unaware that NSP had sold or assigned the
    DOE SWUs to third parties. Therefore, it included the amount of the contract losses
    in the cost basis of the SWUs that Westinghouse used to fabricate the fuel
    assemblies acquired by NSP in those years. As a result, NSP depreciated the
    amount of the DOE contract losses over the life of the fuel assemblies that NSP used
    to generate nuclear power instead of currently deducting them as an ordinary and
    necessary business expense, an ordinary loss, or a capital loss. When, in 1994, the
    NSP's tax department learned that the DOE SWUs had been sold or assigned to third
    parties at a loss in 1984, 1985, and 1986, it timely filed refund claims for the tax
    years 1985 and 1986. In these refund claims, NSP sought to recover the difference
    between the taxes that it paid while depreciating the DOE contract losses and the
    lower taxes it would have paid had it currently deducted them. That difference, with
    interest, is approximately $1,800,000.
    The IRS denied the refund claims. It construed the refund claims as a veiled
    attempt by NSP to change its method of accounting for the contract losses without
    first obtaining the consent of the Commissioner of the IRS as required by law. See
    26 U.S.C. § 446(e). Since NSP had not obtained the Commissioner's consent, and
    the time for doing so had lapsed, the IRS concluded that NSP could not now change
    how it treated the contract losses. NSP challenged this ruling by filing this action,
    2
    NSP also incurred substantial losses in 1984. These losses are not at issue in
    this case, however, because NSP failed to file a refund claim for the 1984 losses before
    the filing deadline expired.
    -6-
    arguing that it was merely attempting to correct a mistake on its earlier returns and
    that it had never adopted a method of accounting for these losses.
    The parties cross-moved for summary judgment. As with the previous issue,
    the district court referred the matter to a magistrate judge. The magistrate judge
    recommended finding in favor of the United States. The district court reviewed the
    magistrate judge's report and agreed with its recommendations. Specifically, the
    district court concluded that because NSP's mistake implicated the proper timing of
    taking a deduction, NSP sought to change its method of accounting, and was
    therefore required to obtain the Commissioner's consent before doing so.
    Consequently, the district court granted summary judgment in favor of the United
    States. See Northern States 
    Power, 952 F. Supp. at 1348-49
    . NSP appeals.
    II.
    We review the district court’s grant of summary judgment de novo. See, e.g.,
    Bremen Bank & Trust Co. v. United States, 
    131 F.3d 1259
    , 1264 (8th Cir. 1997).
    Summary judgment is appropriate when there is no genuine issue of material fact and
    the moving party is entitled to judgment as a matter of law. Fed. R. Civ. P. 56(c).
    Because the parties have stipulated to the relevant facts, the questions on appeal
    solely concern whether the district court’s judgment should be affirmed as a matter
    of law.
    A.    Each Group of Nuclear Fuel Assemblies Qualified for a Depreciation
    Deduction and an Investment Tax Credit in the Year It Was Acquired by NSP.
    Under the Internal Revenue Code ("I.R.C."), sections 167 and 168, a taxpayer
    is allowed to claim a depreciation deduction for property it uses in its trade or
    business. I.R.C. §§ 167, 168. Furthermore, during the years in question, if that
    property also qualified as "section 38 property," a taxpayer could also claim a one-
    -7-
    time investment tax credit ("ITC") based on the acquisition cost of the property.3
    See I.R.C. §§ 38(b)(1), 46(c). Importantly, neither the depreciation deduction nor
    the ITC are available until a taxpayer places the property in service. See Treas.
    Reg. §§ 1.167(a)-10(b) (relating to the depreciation allowance) and 1.46-3(a)
    (relating to the ITC). The United States concedes that the cost of the nuclear fuel
    assemblies is a capital expenditure and that each group of assemblies is a unit of
    depreciable property with a five-year life. See Rev. Rul. 72-507, 1972-2 C.B. 198,
    as clarified by Rev. Rul. 74-237, 1974-1 C.B. 70; Rev. Proc. 74-29, 1974-2 C.B.
    482. Likewise, the United States concedes that any nuclear fuel assemblies placed
    in service on or before December 31, 1986 qualified for an ITC in the year in which
    they were first placed in service. Hence, the issue before us is primarily one of
    timing: namely, when were the two groups of nuclear fuel assemblies first placed in
    service by NSP?
    The United States argues that the district court wrongly concluded that each
    group of nuclear fuel assemblies were placed in service in the taxable year NSP
    acquired them from Westinghouse. It contends that the fuel assemblies were not
    placed in service until NSP inserted them into the reactor core and used them to
    generate salable electric power. Thus, according to the United States, NSP is only
    entitled to begin depreciating the two groups of fuel assemblies in the year that they
    were inserted into the reactor core, 1986 and 1987, respectively, and may only claim
    an ITC for the group of fuel assemblies that it inserted in 1986. We find the United
    States' contention unpersuasive.
    3
    As relevant here, the ITC is not available to property placed in service after
    December 31, 1986. See I.R.C. §§ 49(b)(1) and (e)(1), as enacted by the Tax Reform
    Act of 1986, Pub. L. No. 99-514, § 211, 100 Stat. 2085, 2166 and § 203(b)(1)(A), 100
    Stat. at 2144.
    -8-
    We begin by noting that “placed in service” is not synonymous with “used.”
    Rather, under the Treasury regulations governing both depreciation deductions and
    the ITC, see Treas. Reg. §§ 1.167(a)-11(e)(i) and 1.46-3(d)(1)(ii), respectively,
    property is deemed to be placed in service when it is “first placed in a condition or
    state of readiness and availability for a specifically assigned function.” Treas. Reg. §
    1.167(a)-11(e)(i); accord Treas. Reg. § 1.46-3(d)(1)(ii). While the United States
    correctly observes that we have previously construed “a condition or state of
    readiness and availability” to require property to be “productive on a fairly
    consistent basis,” United States v. Tierney, 
    947 F.2d 854
    , 866 (8th Cir. 1991)
    (citation omitted), the United States forgets the context in which that statement was
    made. In Tierney, we discussed when a number of ethanol plants were first placed
    in service. In so doing, we observed that before the taxpayer could claim tax credits
    for these plants, the plants had to be complete and actually producing ethanol. 
    Id. Here, the
    issue is not when was NSP’s nuclear power plant placed in service, but
    instead when were replacement fuel assemblies placed in service? Prairie Island I
    has been consistently producing electrical power since 1973, and NSP seeks a
    deduction and an ITC not for the entire plant, but for an entirely separate unit of
    property, the replacement nuclear fuel assemblies. Consequently, we find the United
    States’ reliance on Tierney, and other cases involving entire plants, facilities, or
    stores not yet open for business to be misplaced. See, e.g., Siskiyou
    Communications, Inc. v. Commissioner, 
    60 T.C.M. 475
    (1990) (new
    telephone switching system not placed in service until it could process calls);
    Consumers Power Co. v. Commissioner, 
    89 T.C. 710
    (1987) (hydroelectric plant not
    placed in service until it consistently generated electrical power); Piggly Wiggly
    Southern, Inc. v. Commissioner, 
    84 T.C. 739
    (1985), aff’d on other grounds, 
    803 F.2d 1572
    (11th Cir. 1986) (air conditioner and humidifier units purchased for
    unopened stores not placed in service until stores opened for business).
    -9-
    Importantly, as illustrated by Treasury Regulation section 1.46-3(d), property
    can be in a “condition or state of readiness and availability” and yet not be “in use.”
    It provides as follows:
    In the case of property acquired by a taxpayer for use in his trade or
    business . . . , the following are examples of cases where property shall
    be considered in a condition or state of readiness and availability for a
    specifically assigned function:
    (i) Parts are acquired and set aside during the taxable year
    for use as replacements for a particular machine (or
    machines) in order to avoid operational time loss.
    (ii) Operational farm equipment is acquired during the
    taxable year and it is not practicable to use such equipment
    for its specifically assigned function in the taxpayer’s
    business of farming until the following year.
    (iii) Equipment is acquired for a specifically assigned
    function and is operational but is undergoing testing to
    eliminate any defects.
    Treas. Reg. § 1.46-3(d)(2).
    All of these examples depict functional property acquired by a taxpayer for
    use in a going concern on one date, but not used by the taxpayer until a later date.
    Thus, the examples closely parallel the facts of this case. When the nuclear fuel
    assemblies arrived at the Prairie Island plant, a facility that was already producing
    electricity, they were fully constructed and tested according to detailed technical
    specifications and quality assurance plans. Before it could use the assemblies, NSP
    merely had to verify that they had not been damaged when they were shipped to the
    plant. NSP did so in the same year that it acquired them. Thus, on a fundamental
    level, the assemblies were ready and available for their assigned function, i.e., to
    -10-
    refuel a nuclear reactor, in the same year that NSP acquired them. And, as such, the
    assemblies were "in a condition or state of readiness and availability" within the
    meaning of Treasury regulations sections 1.167(a)-1(e)(i) and 1.46-3(d).
    The United States attempts to avoid this obvious conclusion by characterizing
    the examples set forth in the Treasury regulation as narrow exceptions to its basic
    premise that a taxpayer must actually use property before he or she may depreciate it
    or claim an ITC. Specifically, it contends that fuel assemblies are not like the spare
    parts in the first example because NSP did not acquire them to avoid operational
    time loss. It then attempts to limit the second example to those situations in which a
    taxpayer acquires property in one year, intends to use it in that year, but is prevented
    from doing so by forces beyond the taxpayer’s control. Since NSP acquired the fuel
    assemblies for use in a scheduled shut down, the United States asserts that this case
    cannot parallel the example of the farmer’s tractor because the timing of the shut
    down is within NSP's control. Finally, the United States asserts that the third
    example demonstrates that the fuel assemblies were not placed in service until after
    refueling because (1) any equipment that requires such a complex installation
    process cannot be considered operational; and (2) the fuel assemblies had to undergo
    start-up physics testing before the reactor could return to full power. The United
    States’ arguments miss their mark.
    We turn first to the spare parts example. The record demonstrates that
    manufacturing nuclear fuel assemblies is complex and time consuming, requiring
    approximately two-year lead times and detailed engineering. The lead time is
    necessary because Westinghouse manufactures fuel assemblies for other parties in
    addition to NSP, and each fuel assembly must be fabricated according to technical
    specifications that are unique to each reactor. Early delivery of the fuel assemblies is
    designed to ensure that the assembly is fabricated and delivered to the nuclear power
    plant in time for post-delivery inspection and the scheduled shut down. Early
    delivery also ensures that if NSP needs to shut down the reactor ahead of schedule,
    -11-
    it can refuel the reactor without incurring the cost of an additional shut down. Even
    so, the record indicates that financing and storing fuel assemblies is extremely
    expensive. Thus, the final delivery date for fuel assemblies reflects a balance
    between two competing concerns: on the one hand, NSP needs to have the nuclear
    fuel assemblies at the reactor early enough to reduce the risk that the normal
    operating schedule of the plant will be delayed; but on the other hand, NSP needs to
    avoid incurring unnecessary carrying costs. In this way, the nuclear fuel assemblies
    resemble the “parts [] acquired and set aside during the taxable year for use as
    replacements” described by the first example set forth in Treasury regulation section
    1.46-3(d)(2).
    Furthermore, we do not see a distinction between the operational farm
    equipment described in the second example and the nuclear fuel assemblies at issue
    here. While some courts have suggested that this example is limited to
    circumstances in which the taxpayer is prevented from using property by external
    factors, see, e.g., 
    Siskiyou, 60 T.C.M. at 477-78
    (discussing SMC Corp. v.
    United States, 
    675 F.2d 113
    (6th Cir. 1982); Sears Oil Co. v. Commissioner, 
    359 F.2d 191
    (2d Cir. 1966) and Schrader v. Commissioner, 
    34 T.C.M. 1572
    (1975), aff’d, 
    582 F.2d 1374
    (6th Cir. 1978)), we do not. First, the language of the
    example contains no such limitation. Rather, it describes a situation in which it is
    not “practicable” for the taxpayer to use the property in the same year that he or she
    has acquired it. Here, it is not practicable for NSP to refuel the reactors until spring
    when demand for electricity is lower.
    Second, we decline to engage in the potentially endless exercise of delineating
    circumstances within the taxpayer’s control from circumstances beyond the
    taxpayer’s control. Take, for instance, the circumstances involved in Sears Oil. In
    Sears Oil, the taxpayer purchased a barge in the fall of 1957 and towed it to a canal
    in upstate New York to finish outfitting it. Even though the taxpayer finished
    outfitting the barge in 1957, it was unable to use the barge until 1958 because the
    -12-
    canal froze 
    over. 359 F.2d at 198
    . The Sears Oil court rejected the IRS’s argument
    that the barge was placed in service in 1958, and held that it was placed in service in
    1957. 
    Id. The United
    States posits that Sears Oil demonstrates that the second
    example of property in a "condition or state of readiness and availability" only
    applies when external factors limit the use of the property in the acquisition year
    because Sears Oil involved a frozen canal, and a frozen canal is clearly beyond the
    taxpayer's control.
    We think it less clear. After all, the taxpayer in Sears Oil decided to tow a
    barge to upstate New York in the late fall, and it is hardly surprising that canals in
    upstate New York freeze in the winter. Thus, we think that the taxpayer’s
    predicament in Sears Oil was as much a product of external factors as it was the
    taxpayer’s decision to outfit the barge in upstate New York in the late fall. The
    situation described in the example itself makes our analysis more concrete. The
    example allows a farmer who acquires operational farm equipment to depreciate it in
    the acquisition year when it is "not practicable to use [it] . . . until the following
    year." Treas. Reg. § 1.46-3(d)(2)(ii). Notwithstanding the recent effects of El Niño,
    a farmer living in North Dakota who decides to purchase an assembled tractor in
    November, does so knowing full well that he or she will not use it to plow a field
    until the following spring. We see little difference between that farmer and NSP.
    Like the farmer, NSP acquired the fuel assemblies in December, planning to refuel
    the reactor in the spring. And like the tractor that could (in theory) have been used
    to plow a field in November, the fuel assemblies were assembled and ready to refuel
    the reactor when NSP acquired them. Therefore, as in the second example, though
    the fuel assemblies were acquired in 1985 and 1986, it was not practicable for NSP
    to use them until the following years.
    Finally, we are equally unconvinced by the United States' argument based on
    the third example, which involves equipment that is operational but still undergoing
    testing to eliminate any defects. See Treas. Reg. § 1.46-3(d)(2)(iii). Briefly, the
    -13-
    United States contends that the fuel assemblies were not operational when NSP
    acquired them because the refueling process is too complex and because start-up
    testing must be completed before the reactor can return to full power. This
    contention is flawed on two levels. First, when the fuel assemblies arrived at NSP’s
    power plant they were fully completed and ready to be inserted into the reactor.
    Except for inspecting them for possible damage incurred in shipping, there was
    nothing further that NSP had to do, or indeed could do, to make the assemblies more
    ready and available for refueling. Since the parts example set forth in Treasury
    regulation section 1.46-3(d)(2)(i) does not contain a caveat for parts that are
    extremely difficult to install, we decline to create one.
    Second, the United States misapprehends the purpose of start-up physics
    testing. Start-up physics testing does not make the fuel assemblies operational.
    Instead, it verifies that the core design conforms to certain technical specifications
    and that the fuel assemblies were properly installed. Furthermore, as discussed
    previously, the issue here involves the nuclear fuel assemblies, not the power plant.
    Thus, the United States reliance on cases discussing when a new facility becomes
    operational (and is thereby placed in service) is misplaced. Accordingly, we
    conclude that NSP is entitled to the depreciation deductions and investment tax
    credits that it claimed on its federal income tax returns for 1985 and 1986,
    respectively, for the nuclear fuel assemblies that it acquired in each of those years.
    B.    NSP Did Not Change Its Accounting Method When It Filed A Refund Claim
    Seeking to Deduct Contract Losses That It Had Previously Capitalized.
    On cross appeal, NSP argues that the district court erred when it held that
    NSP attempted to impermissibly change its method of accounting by filing refund
    claims seeking to currently deduct the DOE contract losses that NSP had previously
    capitalized. NSP contends that it did not change its method of accounting within the
    meaning of I.R.C. section 446(e), but instead merely corrected an error in its pre-
    -14-
    existing method of accounting. Because we agree with NSP, we reverse and remand
    on this issue.
    Under I.R.C. section 446(e), a taxpayer may not change "the method of
    accounting on the basis of which he regularly computes his income in keeping his
    books" without first obtaining the Secretary's consent. The applicable regulations
    define "method of accounting" operationally. It includes both the "overall method of
    accounting" that a taxpayer uses and "the accounting treatment of any item." Treas.
    Reg. § 1.446-1(a)(1). Hence, a taxpayer changes his or her method of accounting
    when he or she changes either the "overall plan of accounting for gross income or
    deductions or . . . the treatment of any material item used in such overall plan."
    Treas. Reg. § 1.446-1(e)(2)(ii)(a). Under Treasury regulation section 1.446-
    1(e)(2)(ii)(a), a material item is "any item which involves the proper time for the
    inclusion of the item in income or the taking of a deduction."
    Importantly, a taxpayer does not change his or her method of accounting when
    he or she seeks to correct mathematical or posting errors (e.g., recording a figure in
    the wrong account), errors in the computation of tax liability (e.g., errors in the
    calculation of net operating loss), a change in treatment resulting from a change in
    underlying facts or any other "adjustment of any item of income or deduction which
    does not involve the proper time for the inclusion of the item of income or the taking
    of a deduction." Treas. Reg. § 1.446-1(e)(2)(ii)(b). Notwithstanding the foregoing,
    taxpayers who attempt to depreciate, rather than deduct, the cost of a class of
    depreciable assets are to be treated as though they seek to change their method of
    accounting if they have consistently treated the cost as an expense in the year of
    purchase on prior returns. 
    Id. Drawing upon
    these provisions, the United States argues that NSP seeks to
    change its method of accounting without first obtaining consent as required by law.
    At first blush, the United States' argument seems compelling: NSP originally
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    capitalized the DOE contract losses by including them in the cost basis of the nuclear
    fuel assemblies that it used, thereby depreciating the losses over the assemblies'
    useful lives; now NSP, through its refund claims, seeks to deduct the contract losses
    in the year in which it incurred them. Hence, on a fundamental level, NSP's refund
    claims implicate the timing of a deduction, which may lead one to believe that the
    refund claims change NSP's method of accounting. Nevertheless, we conclude that
    NSP does not seek to change its method of accounting for contract losses, but rather
    seeks to correct an error akin to a posting error.
    Both parties agree that as a public utility, see 16 U.S.C. § 824(e), NSP uses
    two distinct methods of accounting, one for financial accounting purposes, and one
    for federal income tax purposes. For financial accounting purposes, the Federal
    Energy Regulatory Commission (“FERC”) requires NSP to use a uniform system of
    accounting. See 18 C.F.R. § 101. This system of accounting is used in ratemaking.
    It seeks to match the depreciation expense for the fuel assemblies with the actual
    British Thermal Units of energy that they produce. Hence, under the FERC system,
    NSP uses specific procedures to account and record costs related to the production
    of electricity. Specifically, NSP uses a capital account called a “work order” to
    reflect the total acquisition costs of each group of fuel assemblies that NSP acquires
    for refueling. The work order capital account includes the cost of the SWUs used to
    fabricate the assemblies. Pursuant to FERC accounting rules, NSP accounted for the
    DOE contract liabilities by including them in the relevant work order capital
    accounts with the cost of the enriched uranium actually used to produce electricity,
    less any amount that NSP was able to recover by selling the DOE SWUs to third
    parties.
    For federal income tax purposes, NSP reports its taxable income under the
    accrual method of accounting. That is, NSP reports its income in the taxable year in
    which it has a fixed right to receive that income; its business expenses in the taxable
    year in which its liability is fixed and the amount of that liability is reasonably
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    certain; and any ordinary losses in the taxable year in which the loss has been
    incurred and any further reimbursement for that loss is no longer reasonably
    foreseeable. See Treas. Reg. § 1.446-1(c)(1)(ii).
    The parties have stipulated that during the relevant taxable years, NSP, using
    the accrual method of accounting, reported any gains from the sales of unneeded or
    unwanted coal or oil as ordinary income, and any losses from these sales as current
    expenses. The parties have also stipulated that NSP's tax department was unaware
    that the figures in the work order capital accounts for 1984, 1985, and 1986, which
    reflected FERC accounting rules, included the net unrecouped losses from the DOE
    enrichment contracts. Consequently, instead of subtracting these losses from the
    work order capital accounts and reporting them separately, NSP's tax department
    mistakenly included them in the capital cost of the fuel assemblies that NSP acquired
    and put in service for those years. Finally, the parties have stipulated that if NSP's
    tax department had known that the figures in the work order capital accounts for
    1984, 1985, and 1986 included the net DOE contract losses, it would have
    subtracted them from the relevant capital accounts and currently deducted them as
    ordinary and necessary business expenses, and/or ordinary losses, or capital losses.
    Under these facts, we are unwilling to conclude that NSP's mistake constituted
    anything more than a type of posting error. NSP's tax department filed the refund
    claims when it learned that the work order account included currently deductible
    contract losses. In so doing, it sought to treat the DOE contract losses in the same
    manner that it has consistently treated similar types of losses, i.e., the coal and oil
    contract losses. In this sense, NSP was not attempting to change its accounting
    method for a class of assets or expenses as contemplated by Treasury regulation
    section 1.446-1(e)(2)(ii)(b) (emphasis added), and it was not required to seek the
    Commissioner's consent. See, e.g., Diebold, Inc. v. United States, 
    891 F.2d 1579
    ,
    1582 (Fed. Cir. 1989) (distinguishing cases in which a taxpayer seeks
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    "to account for [an item] in the same manner that it accounts for other similar items
    or to correct the omission of an item from a method of accounting that it otherwise
    consistently applies to a single category of related items" from cases in which the
    taxpayer seeks to abandon its consistently applied method of accounting for a class
    of items); Gimbel Bros. v. United States, 
    535 F.2d 14
    (Ct. Cl. 1976) (holding that
    taxpayer did not change its method of accounting when it sought a tax refund for two
    years in which it mistakenly reported sales using the accrual method when taxpayer
    had previously elected the installment method of accounting); Korn Indus. v. United
    States, 
    532 F.2d 1352
    (Ct. Cl. 1976) (holding that taxpayer did not change its
    method of accounting when it included three previously omitted items in finished
    goods inventory, even though it affected the timing of a deduction, because
    taxpayer's actions were consistent with how taxpayer treated similar items in that
    class of expenditures); Evans v. Commissioner, 
    55 T.C.M. 902
    (1988)
    (holding that taxpayers did not change their method of accounting when they sought
    to correct the mistaken use of the accrual method of accounting for bonuses when
    they used the cash method of accounting for all items of income and expense).
    The United States counters that the aforementioned cases are inapposite. It
    argues that because NSP treats the costs of coal and oil as a deferred asset for both
    tax and financial accounting purposes, NSP's treatment of the losses on the sales of
    coal and oil is irrelevant. According to the United States, the losses are apparently
    distinguishable because when NSP decided to capitalize the DOE contract losses for
    financial accounting purposes, NSP necessarily decided to capitalize them for tax
    accounting purposes. We find this contention unpersuasive.
    Although NSP does not treat the costs of coal and oil that it uses in its power
    plant as capital expenditures, it does not follow that losses on contracts for the sale
    of coal and oil are somehow different from losses on contracts for the sale of SWUs.
    First, the issue here is not how NSP accounts for the underlying subject matter of the
    contract whether it be coal, oil, or SWUs. The issue is how NSP treats losses
    -18-
    on sales for fuel that it does not need. The United States does not explain why this
    common denominator for tax purposes should not hold. Second, the United States
    forgets that NSP does not treat the SWUs as an independent capital expenditure.
    Rather, it treats the fuel assemblies containing uranium pellets manufactured from
    enriched gas as a capital expenditure. Because the DOE contract losses involve
    SWUs that NSP never used, the SWUs at issue never became capital assets. And
    finally, NSP's decision to capitalize the DOE contract losses for financial accounting
    purposes was driven by FERC accounting rules. Since NSP entered the DOE
    contracts in good faith to secure a stable supply of SWUs, the losses that stemmed
    from these contracts were passed on to NSP's customers. The manner that NSP
    chose to pass on the losses had to be consistent with FERC accounting rules, and the
    United States has stipulated that it was. The United States has also stipulated that
    NSP's method of accounting for ratemaking and financial purposes differs from
    NSP's method of accounting for tax purposes on numerous levels (e.g., the length of
    the useful life of a fuel assembly and the rate of depreciation). Against this
    backdrop, we find that NSP's accounting method for the DOE contract losses for
    ratemaking purposes should not dictate NSP's accounting method for tax purposes.
    Thus, we find that NSP's mistakes were akin to posting errors and did not constitute
    a method of accounting.4 Accordingly, NSP did not change its method of accounting
    when it filed refund claims seeking to deduct the DOE contract losses on its 1985
    and 1986 tax returns. We therefore remand to the district court so that it can
    determine the proper amounts of the refund for each of these years.
    4
    Because we find that NSP did not change its method of accounting, we do not
    address the parties' arguments relating to whether taxpayers must obtain the
    Commissioner's approval before they may depart from an impermissible method of
    accounting.
    -19-
    III.
    We affirm the district court’s opinion in part and reverse and remand in part,
    with instruction to proceed in accordance with this opinion.
    A true copy.
    ATTEST:
    CLERK, U.S. COURT OF APPEALS, EIGHTH CIRCUIT.
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