amazon.com Inc. & Subsidiaries v. Cir , 934 F.3d 976 ( 2019 )


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  •                 FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    AMAZON.COM, INC. & SUBSIDIARIES,         No. 17-72922
    Petitioner-Appellee,
    Tax Ct. No.
    v.                         31197-12
    COMMISSIONER OF INTERNAL
    REVENUE,                                   OPINION
    Respondent-Appellant.
    Appeal from a Decision of the
    United States Tax Court
    Argued and Submitted April 12, 2019
    Seattle, Washington
    Filed August 16, 2019
    Before: William A. Fletcher, Consuelo M. Callahan,
    and Morgan Christen, Circuit Judges.
    Opinion by Judge Callahan
    2                      AMAZON.COM V. CIR
    SUMMARY *
    Tax
    The panel affirmed the Tax Court’s decision on a petition
    for redetermination of federal income tax deficiencies, in an
    appeal involving the regulatory definition of intangible
    assets and the method of their valuation in a cost-sharing
    arrangement.
    In the course of restructuring its European businesses in
    a way that would shift a substantial amount of income from
    U.S.-based entities to the European subsidiaries, appellee
    Amazon.com, Inc. entered into a cost sharing arrangement
    in which a holding company for the European subsidiaries
    made a “buy-in” payment for Amazon’s assets that met the
    regulatory definition of an “intangible.” See 
    26 U.S.C. § 482
    . Tax regulations required that the buy-in payment
    reflect the fair market value of Amazon’s pre-existing
    intangibles. After the Commissioner of Internal Revenue
    concluded that the buy-in payment had not been determined
    at arm’s length in accordance with the transfer pricing
    regulations, the Internal Revenue Service performed its own
    calculation, and Amazon filed a petition in the Tax Court
    challenging that valuation.
    At issue is the correct method for valuing the pre-
    existing intangibles under the then-applicable transfer
    pricing regulations. The Commissioner sought to include all
    intangible assets of value, including “residual-business
    assets” such as Amazon’s culture of innovcation, the value
    *
    This summary constitutes no part of the opinion of the court. It
    has been prepared by court staff for the convenience of the reader.
    AMAZON.COM V. CIR                       3
    of workforce in place, going concern value, goodwill, and
    growth options. The panel concluded that the definition of
    “intangible” does not include residual-business assets, and
    that the definition is limited to independently transferrable
    assets.
    COUNSEL
    Judith A. Hagley (argued), Gilbert S. Rothenberg, and
    Arthur T. Catterall, Attorneys, Tax Division; Richard E.
    Zuckerman, Principal Deputy Assistant Attorney General;
    Travis A. Greaves, Deputy Assistant Attorney General; Tax
    Division, United States Department of Justice, Washington,
    D.C.; for Respondent-Appellant.
    Carter G. Phillips (argued), Joseph R. Guerra, and Matthew
    D. Lerner, Sidley Austin LLP, Washington, D.C.; David R.
    Carpenter, Sidley Austin LLP, Los Angeles, California; for
    Petitioner-Appellee.
    Christopher J. Walker, The Ohio State University Moritz
    College of Law, Columbus, Ohio; Steven P. Lehotsky, U.S.
    Chamber Litigation Center, Washington, D.C.; for Amicus
    Curiae The Chamber of Commerce of the United States of
    America.
    Elizabeth J. Stevens, Caplin & Drysdale, Chartered,
    Washington, D.C., for Amici Curiae H. David Rosenbloom
    and John P. Steines, Jr.
    Alice E. Loughran, Charles G. Cole, Michael C. Durst, and
    Robert J. Kovacev, Steptoe & Johnson LLP, Washington
    D.C., for Amici Curiae Semiconductor Industry Association,
    Information Technology Industry Council, National Foreign
    4                  AMAZON.COM V. CIR
    Trade Council, Software Finance and Tax Executives
    Council, and TechNet.
    A. Duane Webber, George M. Clarke, and Phillip J. Taylor,
    Baker & McKenzie LLP, Washington, D.C.; Mark A. Oates,
    Susan E. Ryba, and Cameron C. Reilly, Baker & McKenzie
    LLP, Chicago, Illinois; Scott H. Frewing, Baker &
    McKenzie LLP, Palo Alto, California; for Amici Curiae
    Silicon Valley Tax Directors Group, Agilent Technologies,
    Inc., Cisco Systems, Inc., Dell Technologies Inc., Dolby
    Laboratories, Inc., Expedia Group, Inc., FireEye, Inc.,
    Genesys Int’l Corp. Ltd., Informatica, Inc., NetApp, Inc.,
    Palo Alto Networks, Inc., Surveymonkey Inc., and
    VMware, Inc.
    OPINION
    CALLAHAN, Circuit Judge:
    Appellee, Amazon.com, Inc., is a U.S.-based online
    retailer with highly profitable intangible assets. In 2005 and
    2006, Amazon restructured its European businesses in a way
    that would shift a substantial amount of its income from
    U.S.-based entities to newly created European subsidiaries.
    Because the restructuring would allow the European entities
    to generate income using Amazon’s pre-existing intangible
    assets developed in the United States, the tax code and
    corresponding regulations required that the European
    entities compensate Amazon for the use of assets that meet
    the regulatory definition of an “intangible.”
    The compensation was provided through a cost sharing
    arrangement, whereby Amazon and a holding company for
    the European subsidiaries would be treated as co-owners of
    AMAZON.COM V. CIR                        5
    the intangibles. Under the arrangement, the holding
    company was required to make a “buy-in” payment for the
    pre-existing intangibles Amazon contributed to the
    arrangement and to make cost sharing payments going
    forward for its share of future research and development
    (R&D) efforts. The buy-in payment was taxable income to
    Amazon, and the holding company’s cost sharing payments
    would reduce Amazon’s U.S. tax deductions for R&D costs.
    To guard against manipulation by jointly controlled
    entities, the regulations require that the buy-in payment
    reflect the fair market value of the pre-existing intangibles
    made available under a cost sharing arrangement. Amazon
    initially reported a buy-in payment of about $255 million.
    Appellant, the Commissioner of Internal Revenue,
    concluded that the buy-in payment had not been determined
    at arm’s length in accordance with the transfer pricing
    regulations, so the IRS performed its own calculation,
    valuing the buy-in at about $3.6 billion. Amazon filed a
    petition in the United States Tax Court challenging the IRS’s
    valuation.
    In the tax court proceedings, Amazon and the
    Commissioner offered competing methods for valuing
    Amazon’s pre-existing intangibles. There was a key
    difference between the parties’ respective approaches.
    Amazon’s methodology isolated and valued only the
    specific intangible assets that it transferred to the European
    holding company under the cost sharing arrangement,
    including website technology, trademarks, and customer
    lists. The Commissioner’s methodology essentially valued
    the entire European business, minus pre-existing tangible
    assets. That method necessarily swept into the calculation
    all contributions of value, including those that are more
    nebulous and inseparable from the business itself, like the
    6                       AMAZON.COM V. CIR
    value of employees’ experience, education, and training
    (known as “workforce in place”), going concern value,
    goodwill, and other unique business attributes and
    expectancies (which the parties refer to as “growth
    options”). The tax court sided primarily with Amazon, and
    the Commissioner appealed.
    This case requires us to interpret the meaning of an
    “intangible” in the applicable (but now outdated) transfer
    pricing regulations. 1 The case turns on whether, as the
    Commissioner argues, the regulatory definition is broad
    enough to include all intangible assets of value, even the
    more nebulous ones that the Commissioner refers to as
    “residual-business assets” (i.e., Amazon’s culture of
    innovation, the value of workforce in place, going concern
    value, goodwill, and growth options). We conclude that the
    definition does not include residual-business assets.
    Although the language of the definition is ambiguous, the
    drafting history of the regulations shows that “intangible”
    was understood to be limited to independently transferrable
    assets. We thus affirm.
    1
    This case is governed by regulations promulgated in 1994 and
    1995. In 2009, more than three years after the tax years at issue here, the
    Department of Treasury issued temporary regulations broadening the
    scope of contributions for which compensation must be made as part of
    the buy-in payment. See 
    74 Fed. Reg. 340
     (Jan. 5, 2009). In 2017,
    Congress amended the definition of “intangible property” in 
    26 U.S.C. § 936
    (h)(3)(B) (which is incorporated by reference in 
    26 U.S.C. § 482
    ).
    Tax Cuts and Jobs Act of 2017, Pub. L. 115-97, § 14221(a), 
    131 Stat. 2054
    , 2218 (2017). If this case were governed by the 2009 regulations
    or by the 2017 statutory amendment, there is no doubt the
    Commissioner’s position would be correct.
    AMAZON.COM V. CIR                             7
    I.
    Before summarizing Amazon’s corporate restructuring
    and the procedural history of this case, we first provide an
    overview of the statutory and regulatory framework for
    transfer pricing.
    A.
    When a taxpayer sells or licenses its property, including
    intangible assets, to another entity, the purchase price or
    license royalty is taxable income. Often, such transactions
    occur between entities “owned or controlled directly or
    indirectly by the same interests.” 
    26 U.S.C. § 482
    . 2 The
    parties in a controlled transaction are in a position to
    potentially manipulate the terms of the transaction to
    minimize taxable income artificially. But section 482 gives
    the Department of the Treasury the power to reallocate the
    dollar figures of such controlled transactions if necessary “to
    prevent evasion of taxes or clearly to reflect the income of”
    a taxpayer. Id.; see also Comm’r v. First Sec. Bank of Utah,
    N.A., 
    405 U.S. 394
    , 400 (1972) (“[Section] 482 is designed
    to prevent ‘artificial shifting, milking, or distorting of the
    true net incomes of commonly controlled enterprises.’”
    (quoting B. Bittker & J. Eustice, Federal Income Taxation of
    Corporations and Shareholders p. 15–21 (3d ed. 1971)).
    The implementing regulations state that “[t]he purpose
    of section 482 is to ensure that taxpayers clearly reflect
    income attributable to controlled transactions, and to prevent
    the avoidance of taxes with respect to such transactions.”
    2
    Unless otherwise indicated, references to section 482 of the
    Internal Revenue Code and the implementing regulations are to the
    versions in effect during the tax years at issue here (2005 and 2006).
    8                   AMAZON.COM V. CIR
    
    Treas. Reg. § 1.482
    ‑1(a)(1).          A reallocation under
    section 482 and the implementing regulations is intended to
    “place[] a controlled taxpayer on a tax parity with an
    uncontrolled taxpayer by determining the true taxable
    income of the controlled taxpayer.” 
    Id.
     The true taxable
    income is determined as if the parties to the controlled
    transaction had conducted their affairs in the manner of
    unrelated parties “dealing at arm’s length.” 
    Treas. Reg. § 1.482
    ‑1(b)(1). The “arm’s length” standard is met “if the
    results of the transaction are consistent with the results that
    would have been realized if uncontrolled taxpayers had
    engaged in the same transaction under the same
    circumstances.” 
    Id.
    The key regulations were promulgated in 1994 and 1995.
    The regulations divide property into two categories: tangible
    property (
    Treas. Reg. § 1.482
    ‑3) and intangible property
    (
    Treas. Reg. § 1.482
    ‑4). This case concerns intangible
    property. The regulations provide:
    (b) Definition of intangible. For purposes of
    section 482, an intangible is an asset that
    comprises any of the following items and has
    substantial value independent of the services
    of any individual—
    (1) Patents, inventions, formulae,
    processes, designs, patterns, or know-
    how;
    (2) Copyrights and literary, musical, or
    artistic compositions;
    (3) Trademarks, trade names, or brand
    names;
    AMAZON.COM V. CIR                        9
    (4) Franchises, licenses, or contracts;
    (5) Methods, programs, systems,
    procedures, campaigns, surveys, studies,
    forecasts, estimates, customer lists, or
    technical data; and
    (6) Other similar items. For purposes of
    section 482, an item is considered similar
    to those listed in paragraph (b)(1) through
    (5) of this section if it derives its value not
    from its physical attributes but from its
    intellectual content or other intangible
    properties.
    
    Treas. Reg. § 1.482
    ‑4(b).
    A controlled taxpayer may make its intangibles available
    to a foreign affiliate by entering a licensing agreement, under
    which the foreign affiliate’s royalty fee is taxable income to
    the controlled taxpayer. See generally 
    Treas. Reg. §§ 1.482
    -
    1, 1.482-4. The royalty fee must, of course, reflect the
    “arm’s length” value of the license. As new intangibles
    continue to be developed, the value of the license changes
    and becomes open to dispute for tax purposes on an ongoing
    basis.
    As an alternative to licensing, the regulations authorize
    jointly controlled entities to enter a cost sharing
    arrangement, under which they become co-owners of
    intangibles developed as a result of the entities’ joint R&D
    10                    AMAZON.COM V. CIR
    efforts. See generally 
    Treas. Reg. § 1.482
    ‑7A. 3 This
    arrangement provides the taxpayer the benefit of certainty
    because, assuming the arrangement satisfies the
    requirements of the regulations, new intangibles need not be
    valued as they are developed.
    Under the regulations, a subsidiary that enters a cost
    sharing arrangement with its parent must make two distinct
    payments. First, the subsidiary must make an arm’s length
    “buy-in” payment reflecting the value of the pre-existing
    intangibles the parent contributes to the arrangement:
    If a controlled participant makes pre-existing
    intangible property in which it owns an
    interest available to other controlled
    participants for purposes of research in the
    intangible development area under a
    qualified cost sharing arrangement, then each
    such other controlled participant must make
    a buy-in payment to the owner.
    
    Treas. Reg. § 1.482
    ‑7A(g)(2). The buy-in payment is
    taxable income for the entity contributing the intangibles—
    here, Amazon.
    Second, the subsidiary must pay a share of the intangible
    development costs (or R&D) “equal to its share of
    reasonably anticipated benefits attributable to such
    development.” 
    Treas. Reg. § 1.482
    ‑7A(a)(2). If the
    controlled taxpayer incurs the lion’s share of the intangible
    development costs, the subsidiary is required to make cost
    3
    We follow the parties’ convention of referring to the regulations
    on cost sharing arrangements by reference to the numbering as
    redesignated in 2009 (i.e., 
    Treas. Reg. § 1.482
    ‑7A).
    AMAZON.COM V. CIR                       11
    sharing payments to reflect its share of the anticipated
    benefits. The subsidiary’s cost sharing payments serve to
    reduce the deductions the controlled taxpayer can take for
    R&D costs (thereby increasing tax liability).
    B.
    Amazon is an online retailer that began operating in the
    United States in 1995. In the late 1990s and early 2000s,
    Amazon expanded operations into France, Germany, and the
    United Kingdom. Amazon’s business in Europe had a siloed
    structure, with separate European subsidiaries independently
    operating and managing the business, each subsidiary
    having its own website, fulfillment centers, and customer
    base. The European subsidiaries licensed the right to use
    Amazon’s website technology, customer information, and
    marketing intangibles (including trademarks and domain
    names).
    To address operational inefficiencies in Europe, in the
    early 2000s Amazon investigated options for creating a
    centralized European headquarters. Amazon ultimately
    located its new headquarters in Luxembourg, which offered
    a central location, the lowest value-added tax rate in Europe,
    and a relatively low corporate tax rate. Beginning in 2004,
    Amazon undertook a series of transactions to implement its
    plan for centralizing business operations in Europe.
    Amazon formed Amazon Europe Holding Technologies
    SCS (“AEHT”) and transferred to AEHT the pre-existing
    European subsidiaries, their operating assets, and their pre-
    existing intangible rights (i.e., those developed in Europe).
    Amazon and AEHT also entered a cost sharing
    12                        AMAZON.COM V. CIR
    arrangement—the transaction most pertinent to this appeal. 4
    For the arrangement to be a “qualified cost sharing
    arrangement” under the transfer pricing regulations outlined
    above, AEHT needed to pay Amazon for the pre-existing
    intangibles Amazon contributed to the arrangement. To
    determine the amount of this “buy-in,” Amazon hired a tax
    firm, which concluded the pre-existing intangibles were
    worth $217 million. 5
    Under the cost sharing arrangement, AEHT also makes
    cost sharing payments to Amazon for its share of ongoing
    intangible development costs. Amazon reported cost
    sharing payments from AEHT of about $116 million for
    2005 and about $77 million for 2006.
    The IRS rejected Amazon’s calculation of AEHT’s buy-
    in, concluding that Amazon grossly undervalued the
    intangibles Amazon made available to AEHT. Applying a
    discounted-cash-flow valuation methodology, the IRS
    determined a buy-in payment of $3.6 billion.6 Amazon filed
    a petition in the tax court challenging the IRS’s valuation.
    Amazon argued that the cost sharing arrangement covered
    4
    The following transactions were also part of the restructuring:
    (1) Amazon granted AEHT a license to use Amazon’s existing
    technology-related intellectual property; (2) Amazon assigned to AEHT
    customer data and certain marketing intangibles (including trademarks,
    website content, and domain names) relating to the European business;
    (3) Amazon transferred the stock of the European subsidiaries to AEHT;
    (4) Amazon transferred other business assets (other than intellectual
    property) to AEHT; and (5) the pre-existing European subsidiaries
    licensed to AEHT intellectual property titled in their names.
    5
    The tax firm set the buy-in price at $254.5 million, to be paid over
    a seven-year period (resulting in a present value of $217 million).
    6
    The IRS’s calculation was later reduced to $3.468 billion.
    AMAZON.COM V. CIR                       13
    three distinct groups of transferred assets—website
    technology, marketing intangibles, and European-customer
    information—that must be valued separately using a
    methodology referred to in the transfer pricing regulations as
    the comparable uncontrolled transaction method.
    After a six-week trial that included testimony and written
    reports of thirty expert witnesses, the tax court concluded
    that the Commissioner abused his discretion in determining
    that the discounted cash flow methodology supplied the best
    method for determining an arm’s length buy-in payment and
    in determining that the required payment is $3.468 billion.
    Amazon.Com, Inc. v. Comm’r, 
    148 T.C. 108
    , 150 (2017).
    Relying on the rationale of its prior decision in Veritas
    Software Corp. v. Commissioner, 
    133 T.C. 297
     (2009),
    nonacq., 2010-49 I.R.B (2010), action on dec., 2010-05
    (Nov. 12, 2010), the tax court reasoned that the
    Commissioner’s valuation methodology “is based in essence
    on an ‘akin to a sale’ theory” and “necessarily sweeps into
    [the] calculation assets that were not transferred under the
    [cost sharing arrangement] and assets that were not
    compensable ‘intangibles’ to begin with.” Amazon.Com,
    148 T.C. at 156–57. The tax court concluded that “[a]n
    enterprise valuation of a business,” like the one conducted
    by the Commissioner’s primary expert, “includes many
    items of value that are not ‘intangibles’” under the cost
    sharing regulations. Id. at 157. Such items include
    “workforce in place, going concern value, goodwill, and
    what trial witnesses described as ‘growth options’ and
    corporate ‘resources’ or ‘opportunities.’” Id. The tax court
    reasoned that such items are “[u]nlike the ‘intangibles’ listed
    14                    AMAZON.COM V. CIR
    in the statutory and regulatory definitions” in that they
    “cannot be bought and sold independently.” Id. 7
    The tax court adopted the comparable uncontrolled
    transaction method as the best way to value the buy-in
    payment because that method allows for the intangibles at
    issue to be isolated and separately valued. Id. at 164.
    Although the tax court agreed with Amazon’s general
    valuation approach, it disagreed with certain aspects of
    Amazon’s implementation of that method. Id. After making
    adjustments, the tax court calculated the value of the buy-in
    payment to be about $779 million. The Commissioner
    timely appealed, challenging the tax court’s rejection of his
    expert’s discounted cash flow methodology. 8
    II.
    The tax court had jurisdiction over this action under
    
    26 U.S.C. § 6213
    (a). We have jurisdiction under 
    26 U.S.C. § 7482
    (a)(1), (b)(1).
    “[W]e review the tax court’s conclusions of law de novo
    and its factual findings for clear error.” MK Hillside
    7
    The tax court made several other legal conclusions and factual
    findings not relevant to the Commissioner’s appeal.
    8
    Although we affirm the tax court, nothing in our decision should
    be construed as an outright rejection of any particular valuation
    methodology. Here, the parties’ respective valuation methods did not
    differ only in how they valued Amazon’s assets; they differed in what
    assets they valued. The selection of the “best method” here, see 
    Treas. Reg. § 1.482-1
    (c), thus turns on an interpretation of the regulatory
    definition of an “intangible.” Nothing in our opinion should be
    construed as favoring one valuation method over another in
    circumstances not present here.
    AMAZON.COM V. CIR                            15
    Partners v. Comm’r, 
    826 F.3d 1200
    , 1203 (9th Cir. 2016)
    (quoting DHL Corp. & Subsidiaries v. Comm’r, 
    285 F.3d 1210
    , 1216 (9th Cir. 2002)).
    III.
    The dispositive issue in this case is whether, under the
    1994/1995 regulations, the “buy-in” required for “pre-
    existing intangible property” must include compensation for
    residual-business assets. 9 To answer this legal question, we
    consider the regulatory definition of an “intangible,” the
    overall transfer pricing regulatory framework, the
    rulemaking history of the regulations, and whether the
    Commissioner’s position is entitled to deference under Auer
    v. Robbins, 
    519 U.S. 452
     (1997). We agree with the tax court
    that the definition of an “intangible” in § 1.482-4(b) was not
    intended to embrace residual-business assets.
    A.
    The Commissioner argues that Amazon’s valuable
    residual-business assets meet “§ 1.482‑4(b)’s definition of
    intangibles.” “Regulations are interpreted according to the
    same rules as statutes, applying traditional rules of
    construction.” Minnick v. Comm’r, 
    796 F.3d 1156
    , 1159
    (9th Cir. 2015); see Kisor v. Wilkie, 
    139 S. Ct. 2400
    , 2415
    (2019) (recognizing that “all the ‘traditional tools’ of
    construction” are the same for both statutes and regulations
    9
    The Commissioner also challenges some of the tax court’s other
    reasons for rejecting the valuation conducted by the Commissioner’s
    expert. But in each of his other challenges, the Commissioner’s
    argument assumes he is correct on his primary contention that the
    definition of “intangible” in the 1994/1995 regulations embraces
    residual-business assets. Because we reject the Commissioner’s view on
    the primary issue, we need not address his other contentions.
    16                 AMAZON.COM V. CIR
    (quoting Chevron, U.S.A., Inc. v. Nat. Res. Def. Council,
    Inc., 
    467 U.S. 837
    , 843 n.9 (1984))). Our “legal toolkit”
    includes careful examination of “the text, structure, history,
    and purpose of a regulation.” Kisor, 
    139 S. Ct. at 2415
    .
    We begin with the language of § 1.482-4(b). If the
    regulation is unambiguous, its plain meaning governs. Safe
    Air For Everyone v. EPA, 
    488 F.3d 1088
    , 1097 (9th Cir.
    2007).
    The regulation defines an “intangible” as an asset that
    both “has substantial value independent of the services of
    any individual” and is one of the items listed in subsection
    (b)(1)–(6). 
    Treas. Reg. § 1.482
    ‑4(b). Each of the 28 specific
    items in subsection (b) is independently transferrable—none
    is a residual-business asset. The Commissioner thus relies
    on the catchall provision for “[o]ther similar items.” 
    Treas. Reg. § 1.482
    ‑4(b)(6). “[A]n item is considered similar” to
    the other items in the subsection “if it derives its value not
    from its physical attributes but from its intellectual content
    or other intangible properties.” 
    Id.
    Reading the catchall provision together with the
    introductory language of the definition, residual-business
    assets are intangibles if they (1) have substantial value
    independent of the services of any individual and (2) derive
    their value from intellectual content or other intangible
    properties. The Commissioner argues both elements are
    satisfied. First, he argues that Amazon’s growth options
    “derive their value from intangible, rather than physical,
    attributes.” He then cites testimony from Amazon’s expert
    (Dr. Bradford Cornell) that Amazon’s growth options are
    primarily attributable to its culture of innovation. Second,
    he argues that the value of Amazon’s growth options is
    independent of the services of any individual because they
    AMAZON.COM V. CIR                       17
    are “part of the culture of Amazon to be able to have creative
    ideas bubble up in their organization and actually use them.”
    Amazon argues that the Commissioner’s interpretation
    of the catchall provision is too sweeping for several reasons.
    Amazon’s central argument is that to qualify as an
    “intangible” under the regulation, an item must be capable
    of being bought and sold independently of the business—
    and residual-business assets are inseparable from the
    business. The tax court agreed. See Amazon.Com, 148 T.C.
    at 157 (concluding that, unlike the specific intangibles listed
    in the regulation, “workforce in place, going concern value,
    goodwill, and what trial witnesses described as ‘growth
    options’ and corporate ‘resources’ or ‘opportunities’ . . .
    cannot be bought and sold independently”).
    Amazon offers several arguments in support of its
    position that assets that are inseparable from the business do
    not meet the regulatory definition of an “intangible.”
    Quoting Arcadia v. Ohio Power Co., 
    498 U.S. 73
    , 78 (1990),
    Amazon argues that the Commissioner’s interpretation
    renders the “enumeration of specific subjects entirely
    superfluous—in effect adding to that detailed list ‘or
    anything else.’” Amazon invokes the canon ejusdem
    generis—of the same kind or class—and asserts that “[t]he
    common attribute of all 28 specified items is that they can be
    sold independently.” Amazon argues this canon should be
    applied to prevent the catchall clause from swallowing the
    preceding language of the regulation.
    Amazon’s focus on the commonality of the 28 specified
    items has some force. After all, if all 28 listed items share a
    common attribute, why would anyone understand a catchall
    for “similar items” to include a non-listed item that doesn’t
    share that attribute? Amazon’s commonality argument
    falters, however, because the catchall provision did not
    18                  AMAZON.COM V. CIR
    simply say “[o]ther similar items.” Instead, the catchall
    elaborated by explaining how an item is determined to be
    “similar” to the other items: “if it derives its value not from
    its physical attributes but from its intellectual content or
    other intangible properties.” 
    Treas. Reg. § 1.482-4
    (b)(6).
    This explanation of what is “similar” leaves open the
    possibility of a non-listed item being included in the
    definition even if it doesn’t share the attribute of being
    separately transferrable.
    Amazon also argues that the regulation’s requirement
    that an intangible have “substantial value independent of the
    services of any individual,” 
    Treas. Reg. § 1.482
    ‑4(b),
    supports its position. The tax court in Veritas agreed. In that
    case, the tax court rejected the Commissioner’s argument
    that a foreign subsidiary’s buy-in under a cost sharing
    arrangement must include the value of the subsidiary’s
    access to the U.S. corporate parent’s R&D and marketing
    teams—i.e., workforce in place. Veritas, 133 T.C. at 323.
    Although the court found insufficient evidence that the cost
    sharing arrangement made such a transfer, it also stated that
    “[e]ven if such evidence existed, these items would not be
    taken into account in calculating the requisite buy-in
    payment because they do not have ‘substantial value
    independent of the services of any individual’ and thus do
    not meet the” definition of “intangible.” Id. at 323 n.31
    (quoting 
    Treas. Reg. § 1.482
    ‑4(b)). The court reasoned that
    the value of access to the parent’s “R&D and marketing
    teams is based primarily on the services of individuals (i.e.,
    the work, knowledge, and skills of team members).” 
    Id.
     The
    Commissioner clearly disagrees with Veritas on this point,
    but he doesn’t explain why the tax court’s analysis is wrong.
    Analysis of the regulatory text alone does not
    definitively resolve the question here. The definition of an
    AMAZON.COM V. CIR                              19
    “intangible” is susceptible to, but does not compel, an
    interpretation that embraces residual-business assets. The
    problem is that residual-business assets, such as “growth
    options” and a “culture of innovation,” are amorphous, and
    it’s not self-evident whether such assets have “substantial
    value independent of the services of any individual.” See
    
    Treas. Reg. § 1.482
    ‑4(b).       Amazon raises legitimate
    concerns about the regulation’s catchall being stretched too
    far, and those concerns likely bear on which party has the
    more reasonable view of the regulatory definition. It
    nonetheless remains that the definition of “intangible” could
    be construed as covering residual-business assets if the
    language of § 1.482‑4(b) is viewed in isolation. 10
    B.
    But we are required to look at the regulatory scheme “as
    a whole,” viewing the regulatory “definition in the context
    of the entire [transfer pricing] regulations.” Alaska Trojan
    P’ship v. Gutierrez, 
    425 F.3d 620
    , 628 (9th Cir. 2005). The
    Commissioner argues that other regulations governing
    transfer pricing support his view that the regulatory
    definition of an “intangible” embraces residual-business
    10
    The Commissioner also argues that the definition of an
    “intangible” includes residual-business assets because an uncontrolled
    party would pay for access to those assets in an arm’s length transaction.
    He cites the testimony of Amazon’s expert that parties dealing at arm’s
    length “[d]efinitely” pay for “growth options” because “[n]o company is
    going to give away something of value without compensation.” The
    Commissioner’s argument misses the mark. Under the regulations, the
    arm’s length standard governs the valuation of intangibles; it doesn’t
    answer whether an item is an intangible. The definition of an
    “intangible” is provided in § 1.482‑4(b). The Commissioner points to no
    language in the statute or regulations suggesting that the definition of
    what constitutes an intangible is determined by asking whether an
    uncontrolled party would pay for it.
    20                     AMAZON.COM V. CIR
    assets. He cites two sections in the regulations, §§ 1.482‑7A
    and 1.482‑1.
    Section 1.482‑7A specifies the requirements of a
    qualified cost sharing arrangement and the methods for
    determining the taxable income resulting from such an
    arrangement. The Commissioner cites the subsection that
    imposes the “buy-in” requirement where “[a] controlled
    participant . . . makes intangible property available to a
    qualified cost sharing arrangement.”             
    Treas. Reg. § 1.482
    ‑7A(g)(1). The Commissioner argues that this
    provision mandates that residual-business assets be paid for
    “if they are made ‘available’ to the cost-sharing participants”
    even though such assets generally cannot be transferred
    independently from the business.
    The     Commissioner’s       argument       based      on
    § 1.482‑7A(g)(1) presupposes the very point he attempts to
    prove—that residual-business assets are “intangible
    property” within the meaning of the regulations. The
    provision requiring a “buy-in” does not expand but instead
    incorporates the meaning of an “intangible” given in
    § 1.482-4(b). See 
    Treas. Reg. § 1.482
    ‑7A(g)(2) (“The buy-
    in payment by each such other controlled participant is the
    arm’s length charge for the use of the intangible . . . .”
    (emphasis added)). The “makes . . . available” language thus
    provides no meaningful insight into the regulatory definition
    of an “intangible.” 11
    11
    Considered in context of the regulatory framework, it appears that
    the purpose of the “makes . . . available” phrasing in § 1.482‑7A(g) is to
    account for taxpayers who might seek to avoid the requirements of the
    transfer pricing regulations by not formally transferring their intangible
    assets to a related party and instead informally making available the
    AMAZON.COM V. CIR                             21
    The Commissioner also finds support for his position in
    the regulations’ preamble stating that “[t]he purpose of
    section 482 is to ensure that taxpayers clearly reflect income
    attributable to controlled transactions and to prevent the
    avoidance of taxes with respect to such transactions.” 
    Treas. Reg. § 1.482
    ‑1(a)(1).        Relying on Xilinx, Inc. v.
    Commissioner, 
    598 F.3d 1191
     (9th Cir. 2010), the
    Commissioner argues that “anything of value that is made
    available between related parties must be paid for” in the
    buy-in, regardless of whether it is defined as an intangible.
    In Xilinx, we considered whether the parties to a cost
    sharing arrangement “must include the value of certain stock
    option compensation one participant gives to its employees
    in the pool of costs to be shared.” 
    Id. at 1192
    . We found
    two provisions of the regulations in conflict. We first cited
    § 1.482‑1(b)(1)’s statement that “the standard to be applied
    in every case is that of a taxpayer dealing at arm’s length
    with an uncontrolled taxpayer.” Id. at 1195 (quoting 
    Treas. Reg. § 1.482
    ‑1(b)(1)). It was undisputed on appeal that
    unrelated parties would not have shared the employee stock
    option costs. 
    Id. at 1194
    . Another provision, however,
    required that “controlled parties in a cost sharing agreement
    . . . share all ‘costs . . . related to the intangible development
    area,’” which by definition would include the employee
    stock options. 
    Id. at 1196
    . In resolving this conflict, the
    Xilinx majority affirmed the tax court’s conclusion that the
    stock options need not be paid for as part of the buy-in. 
    Id.
    assets. The regulations thus treat such taxpayers “as having transferred
    interests in such [intangible] property.” 
    Treas. Reg. § 1.482
    ‑7A(g)(1).
    22                      AMAZON.COM V. CIR
    at 1196–97. The primary opinion reasoned that “[p]urpose
    is paramount.” 
    Id. at 1196
    . 12
    Relying on the logic of the primary opinion in Xilinx, the
    Commissioner asserts that “it is undisputed that a company
    entering into the same transaction under the same
    circumstances with an unrelated party would have required
    compensation.” To evaluate this claim, it’s important to be
    clear about what exactly is meant by the phrase “the same
    transaction under the same circumstances.”                The
    Commissioner relies on deposition testimony from one of
    Amazon’s experts that parties dealing at arm’s length would
    pay for growth options. But the expert explained at trial the
    difference between an investor or purchaser of the entire
    business (who would pay for the full value of the business)
    and a partner (who would not). The question becomes
    whether a cost sharing arrangement is akin to the sale of a
    business or like a partnership in certain assets or aspects of
    the business. The Commissioner assumes, but does not
    explain why, the transfer of intangible assets under
    12
    Caution should be taken before relying on the rationale of the
    primary opinion in Xilinx. One panel member concurred—thus
    providing a majority vote for the disposition—but wrote separately “to
    explain [his] particular reasons for rejecting the Commissioner’s
    position.” 
    Id. at 1197
     (Fisher, J., concurring). Although the reasoning
    of the concurring opinion overlaps somewhat with the reasoning of the
    primary opinion, the concurrence does not seem to adopt the “[p]urpose
    is paramount” logic. Instead, based on the language of the regulations,
    the legislative and regulatory history, international tax treaties, and the
    understanding of the business community and tax professionals (i.e.,
    amici curiae), the concurrence concluded that the taxpayer’s
    “understanding of the regulations is the more reasonable even if the
    Commissioner’s current interpretation may be theoretically plausible.”
    
    Id. at 1198
    .
    AMAZON.COM V. CIR                       23
    Amazon’s cost sharing arrangement with AEHT should be
    treated the same as the sale of the business.
    The Commissioner’s reliance on Xilinx thus suffers the
    same defect as his “made available” argument based on
    § 1.482-7A(g)—he assumes the very conclusion he’s aiming
    to prove.      Although the regulatory provisions the
    Commissioner cites are consistent with his position, they do
    not provide independent support and they are likewise
    consistent with Amazon’s view.
    If the cost sharing regulations as a whole tip the scale
    either direction, they tend to favor Amazon on the issue
    presented here. The regulations describe a cost sharing
    arrangement as an agreement “to share the costs of
    development of one or more intangibles.” 
    Treas. Reg. § 1.482
    ‑7A(a)(1). The written document memorializing the
    arrangement must, among other things, describe both “the
    scope of the research and development to be undertaken,
    including the intangible or class of intangibles intended to be
    developed.” 
    Treas. Reg. § 1.482
    ‑7A(b)(4)(iii). The writing
    must also describe “each participant’s interest in any covered
    intangibles,” which is “any intangible property that is
    developed as a result of the research and development
    undertaken under the cost sharing arrangement.” 
    Treas. Reg. § 1.482
    ‑7A(b)(4)(iv). By identifying intangibles as
    being the product of R&D efforts, the regulations seem to
    contemplate a meaning of “intangible” that excludes items
    like goodwill and going concern value, which “are generated
    by earning income, not by incurring deductions.” Staff of J.
    Comm. on Taxation, 98th Cong., General Explanation of the
    Revenue Provisions of the Deficit Reduction Act of 1984,
    428 (Comm. Print 1984).
    24                 AMAZON.COM V. CIR
    The overall regulatory scheme doesn’t definitively
    resolve the issue, but it favors Amazon more than the
    Commissioner.
    C.
    We next turn to the drafting history of the regulatory
    definition. Both parties claim support for their respective
    positions in the historical development of the regulations.
    Treasury first defined intangible property for purposes of
    section 482 in regulations adopted in 1968:
    [I]ntangible property shall consist of the
    items described in subdivision (ii) of this
    subparagraph, provided that such items have
    substantial value independent of the services
    of individual persons.
    (ii) The items referred to in subdivision (i) of
    this subparagraph are as follows:
    (a) Patents, inventions, formulas,
    processes, designs, patterns, and other
    similar items;
    (b) Copyrights, literary, musical, or
    artistic compositions, and other similar
    items;
    (c) Trademarks, trade names, brand
    names, and other similar items;
    (d) Franchises, licenses, contracts, and
    other similar items;
    AMAZON.COM V. CIR                              25
    (e) Methods, programs, systems,
    procedures, campaigns, surveys, studies,
    forecasts, estimates, customer lists,
    technical data, and other similar items.
    
    33 Fed. Reg. 5848
    , 5854 (Apr. 16, 1968).
    Fourteen years later, Congress enacted the Tax Equity
    and Fiscal Responsibility Act of 1982, adopting a definition
    of intangible property in section 936 of the Internal Revenue
    Code that was nearly identical to the one in the regulations
    implementing section 482. 13 The Commissioner plucks a
    phrase from a Senate Report for the 1982 Act suggesting that
    the statute “defines intangible assets broadly.” With more
    context, the quoted sentence from the Senate Report states
    that “[t]he bill defines intangible assets broadly to include”
    the 28 specifically-listed items “and other items similar to
    any of those listed, so long as the item has substantial value
    independent of the services of individual persons.” S. Rep.
    97-494, at 161 (1982), as reprinted in 1982 U.S.C.C.A.N.
    781, 924 (emphasis added). 14
    13
    The new statutory definition differed from the regulatory one in
    four, relatively minor respects: (1) making all enumerated items singular;
    (2) adding “know-how” to the first category; (3) inserting “any similar
    item” as a stand-alone category in lieu of “other similar items” in each
    category; and (4) requiring that an item have “substantial value
    independent of the services of any individual” rather than “of individual
    persons.” Tax Equity & Fiscal Responsibility Act of 1982, Pub. L. 97-
    248, § 213, 
    96 Stat. 324
     (Sept. 3, 1982).
    14
    Another part of the quoted Senate Report states that the
    Committee viewed the bill as combatting the practice of transferring
    intangibles “created, developed or acquired in the United States” to
    foreign entities to generate income tax-free. S. Rep. 97-494, at 158–59
    (1982), as reprinted in 1982 U.S.C.C.A.N. 781, 921–22. It seems from
    26                     AMAZON.COM V. CIR
    The Tax Reform Act of 1986 amended section 482 to
    incorporate the “intangible property” definition from section
    936: “In the case of any transfer (or license) of intangible
    property (within the meaning of section 936(h)(3)(B)), the
    income with respect to such transfer or license shall be
    commensurate with the income attributable to the
    intangible.” Pub. L. 99–514, § 1231, 
    100 Stat. 2085
     (Oct.
    22, 1986).
    When it amended section 482, Congress requested that
    the IRS conduct “a comprehensive study of intercompany
    pricing rules” and report on whether the existing regulations
    “could be modified in any respect.” H.R. Rep. No. 99-841,
    at II-637 (1986). The resulting IRS report, known as the
    “White Paper,” laid the groundwork for what would
    ultimately become the 1994/1995 regulations. A Study of
    Intercompany Pricing Under Section 482 of the Code, I.R.S.
    Notice 88-123, 1988-
    2 C.B. 458
    .
    The White Paper discussed, among other things, cost
    sharing arrangements. According to the White Paper, the
    purpose of the buy-in requirement is for “a party to a cost
    sharing arrangement that has contributed funds or incurred
    risks for development of intangibles at an earlier stage” to be
    “compensated by the other participants.” 
    Id. at 497
    . “[I]f
    there are intangibles that are not fully developed that relate
    to the research to be conducted under the cost sharing
    arrangement, it is necessary to value them in order to
    determine an appropriate buy-in payment.” 
    Id.
    this language, the Committee didn’t contemplate intangibles that are not
    independently transferrable.
    AMAZON.COM V. CIR                       27
    The White Paper proposed “three basic types of
    intangibles” that would be subject to the buy-in requirement:
    •   “preexisting intangibles at various stages of
    development that will become subject to the
    arrangement”;
    •   “basic research not associated with any product”; and
    •   “a going concern value associated with a
    participant’s research facilities and capabilities that
    will be utilized.”
    
    Id.
     Although the White Paper proposed including going
    concern value of a research facility in the buy-in, after
    receiving opposition in public comments, Treasury proposed
    new regulations that essentially retained the definition of
    “intangible” from before without referencing going concern
    value or any other residual-business asset. See 
    57 Fed. Reg. 3571
    , 3579 (Jan. 30, 1992).
    In 1993, Treasury issued revised temporary and
    proposed regulations that defined an “intangible” as “any
    commercially transferable interest” in the intangibles listed
    in § 936(h)(3)(B) that had “substantial value independent of
    the services of any individual.” 
    58 Fed. Reg. 5263
    , 5287
    (Jan. 21, 1993). Treasury also requested comment on
    “whether the definition of intangible property . . . should be
    expanded to include items not normally considered to be
    items of intellectual property, such as work force in place,
    goodwill or going concern value.” 
    58 Fed. Reg. 5310
    , 5312
    (Jan. 21, 1993). Amazon cites opposition comments
    submitted in response to Treasury’s request for comment.
    In 1994, Treasury issued final regulations (the ones
    applicable here), which reflected a minor reworking of the
    28                  AMAZON.COM V. CIR
    definition. 
    59 Fed. Reg. 34971
    , 35016 (Jul. 8, 1994).
    Treasury explained that the revised definition omitted the
    “commercially transferrable” language that appeared in the
    temporary regulations “because it was superfluous: if the
    property was not commercially transferrable, then it could
    not have been transferred in a controlled transaction.” 
    Id. at 34983
    .     Treasury also explained that the revision
    “clarified” that the phrase “other similar items” in the
    definition “refer[s] to items that derive their value from
    intellectual content or other intangible properties rather than
    physical attributes.” 
    Id.
     In 1995, Treasury issued final
    regulations governing cost sharing arrangements, including
    § 1.482‑7A(g)’s “buy-in” requirement.
    The drafting history of the transfer pricing regulations
    does not support the Commissioner’s argument that the
    definition of an “intangible” covered residual-business
    assets. The only references in the drafting history to any
    residual-business assets suggest that such items were
    excluded from the definition of intangible assets. The IRS’s
    1988 White Paper proposed including “going concern value”
    of a research facility in the buy-in, but Treasury’s 1994/1995
    regulations kept essentially the same definition as before
    without referring to “going concern value” or any other
    residual-business asset. See 57 Fed. Reg. at 3579.
    Two key statements by Treasury in the drafting history
    render the Commissioner’s current position untenable. First,
    in 1993, Treasury confirmed that the then-existing definition
    of “intangible” did not include residual-business assets when
    it asked for comments on whether the definition of
    intangibles “should be expanded to include items not
    normally considered to be items of intellectual property,
    such as work force in place, goodwill or going concern
    value.” 58 Fed. Reg. at 5312 (emphasis added). Second, a
    AMAZON.COM V. CIR                              29
    year later after opting against such an expansion, and instead
    retaining the same essential definition from before
    (including the same list of 28 items), Treasury explained that
    the final (1994) rule merely “clarified” when an item would
    be deemed similar to the 28 items listed in the definition.
    59 Fed. Reg. at 34983.
    The Commissioner is thus forced to argue that what
    Treasury explicitly confirmed would not be considered an
    “intangible” without a substantive “expan[sion]” of the
    definition was implicitly added to the definition through a
    non-specific “clarifi[cation].”      The Commissioner’s
    argument stretches “clarification” beyond its commonly
    understood meaning of merely clearing up what was
    previously ambiguous or otherwise restating a standard
    consistent with what was previously intended. Cf. Motorola,
    Inc. v. Fed. Exp. Corp., 
    308 F.3d 995
    , 1007 (9th Cir. 2002)
    (distinguishing between a “clarifying amendment” and “one
    that work[s] a substantive change” (emphasis omitted)). 15
    Another statement from the drafting history of § 1.482‑4
    lends further support for Amazon’s position that
    “intangible” has always been understood to be limited to
    assets that are independently transferrable. Treasury’s
    temporary regulations in 1993 defined an “intangible” as
    “any commercially transferable interest” in the intangibles
    listed in section 936(h)(3)(B) that had “substantial value
    independent of the services of any individual.” 58 Fed. Reg.
    at 5287. When Treasury left out the “commercially
    15
    Amazon and amici curiae also argue that if the Commissioner is
    correct that the non-specific “clarifi[cation]” of § 1.482-4(b)’s catchall
    substantively expanded the definition of an “intangible,” then
    Treasury/IRS violated the Administrative Procedures Act. We need not
    address this argument because we reject the Commissioner’s post hoc
    interpretation of the changes to the regulatory definition.
    30                 AMAZON.COM V. CIR
    transferrable” language from the final regulations issued a
    year later, it explained that the omitted language was
    “superfluous” because “if the property was not
    commercially transferrable, then it could not have been
    transferred in a controlled transaction.” 59 Fed. Reg. at
    34983. This is consistent with the basic premise of the
    transfer pricing regulations, which contemplate a situation in
    which particular assets are transferred from one entity to
    another.
    The Commissioner now contends that the 1994
    definition was intended to embrace residual-business assets
    even though such assets “cannot be transferred
    independently.” Yet the Commissioner fails to identify any
    contemporaneous statement by the agency that would
    “display awareness” that it was changing its position on
    whether residual-business assets are included within the
    definition of intangibles. See FCC v. Fox Television
    Stations, Inc., 
    556 U.S. 502
    , 515 (2009) (“[T]he requirement
    that an agency provide reasoned explanation for its action
    would ordinarily demand that it display awareness that
    it is changing position. An agency may not, for example,
    depart from a prior policy sub silentio or simply disregard
    rules that are still on the books.”).
    The Commissioner argues his position is supported by a
    different regulatory scheme governing penalties for
    taxpayers who substantially misstate the value of property
    on their tax returns. See 
    26 U.S.C. § 6662
    (e). In 1993,
    Treasury proposed regulations “designed to encourage
    taxpayers to document their transfer pricing transactions and
    to provide that documentation to the [IRS] upon request.”
    
    58 Fed. Reg. 5304
    , 5304 (Jan. 21, 1993). To that end, the
    proposed regulations provided rules for determining whether
    a taxpayer has substantially misstated the value of property.
    AMAZON.COM V. CIR                     31
    Those rules defined “property” to include “intangible
    property,” which in turn was defined to include “property
    such as goodwill, covenants not to compete, leaseholds,
    patents, contract rights, debts, and choices in action.” 
    Id. at 5306
    .
    The Commissioner’s attempt to bootstrap § 1.6662-5’s
    reference to “goodwill” ignores that the proposed regulation
    concerning substantial valuation misstatements was issued
    on the same day Treasury separately confirmed that the
    definition of “intangible” for purposes of the regulations
    implementing section 482 did not include goodwill or other
    residual-business assets. 58 Fed. Reg. at 5312. Considering
    the context, Treasury’s use of “goodwill” in § 1.6662-5 but
    not in § 1.482‑4(b) most likely evinces an intent not to
    include goodwill or other residual-business assets within
    § 1.482‑4(b)’s definition of “intangible.”
    Amazon points to other Treasury regulations that define
    certain covered property by incorporating the definition of
    intangible property under section 936(h)(3)(B) and then
    adding goodwill and going concern value. 
    Treas. Reg. §§ 1.954-2
    (e)(3)(iv), 1.861-9T(h)(1)(ii). These provisions
    add little to the discussion, but the express inclusion of
    goodwill and going concern value in these regulations is
    consistent with Amazon’s position that the definition of
    “intangible” in section 936(h)(3)(B) and § 1.482‑4(b) was
    understood to exclude goodwill and going concern value.
    These regulations also show that Treasury “clearly knew
    how to write its regulations” to include goodwill and other
    residual-business assets. Karczewski v. DCH Mission Valley
    LLC, 
    862 F.3d 1006
    , 1015–16 (9th Cir. 2017).
    32                      AMAZON.COM V. CIR
    The drafting history of § 1.482‑4(b) strongly supports
    Amazon’s position that Treasury limited the definition of
    “intangible” to independently transferrable assets. 16
    D.
    The Commissioner next argues that the tax court should
    have deferred to the IRS’s interpretation of its own
    regulations. Under certain circumstances, an agency’s
    interpretation of its own regulations “must be given
    ‘controlling weight’” if it is not “‘plainly erroneous or
    inconsistent with the regulation.’” Stinson v. United States,
    
    508 U.S. 36
    , 45 (1993) (quoting Bowles v. Seminole Rock &
    Sand Co., 
    325 U.S. 410
    , 414 (1945)); see also Auer v.
    Robbins, 
    519 U.S. 452
    , 461–62 (1997). This is frequently
    referred to as Auer deference.
    The Supreme Court “has cabined Auer’s scope in varied
    and critical ways.” Kisor, 
    139 S. Ct. at 2418
    . “First and
    foremost, a court should not afford Auer deference unless the
    16
    In 2017, Congress amended the definition of “intangible property”
    in section 936(h)(3)(B). That amendment added “goodwill, going
    concern value, or workforce in place” to the list of specific items
    included in the definition of “intangible property.” Tax Cuts & Jobs Act
    of 2017, Pub. L. 115-97, § 14221(a), 
    131 Stat. 2054
    , 2218 (2017).
    Characterizing the change as merely a “clarification,” the Commissioner
    argues that the 2017 amendment supports his proffered interpretation of
    the 1994/1995 regulations. But the Commissioner’s post-hoc label of
    Congress’s amendment is not controlling, see Beaver v. Tarsadia Hotels,
    
    816 F.3d 1170
    , 1186 (9th Cir. 2016) (“Post-hoc labeling as a
    ‘clarification’ by bill supporters of what otherwise appears to be a change
    . . . is not controlling . . . .”), and it’s also not supported by Congress’s
    own words. Congress stated that the amendment should not be
    “construed to create any inference” as to the definition of intangibles for
    taxable years occurring before the amendment’s effective date. 131 Stat.
    at 2219. Congress said nothing to indicate that the amendment was
    meant only as a clarification.
    AMAZON.COM V. CIR                        33
    regulation is genuinely ambiguous.” Id. at 2415. Genuine
    ambiguity is not determined by examination of the
    regulatory text alone. Instead, “before concluding that a rule
    is genuinely ambiguous, a court must exhaust all the
    ‘traditional    tools’    of     construction,”     “‘carefully
    consider[ing]’ the text, structure, history, and purpose of a
    regulation, in all the ways it would if it had no agency to fall
    back on.” Id. (first quoting Chevron, 
    467 U.S. at
    843 n.9;
    then quoting Pauley v. BethEnergy Mines, Inc., 
    501 U.S. 680
    , 707 (1991) (Scalia, J., dissenting))).
    The text of the regulatory definition of “intangible,” the
    definition’s place within the transfer pricing regulations
    generally, and the rulemaking history leave little room for
    the Commissioner’s proffered meaning. But even if there
    were genuine ambiguity, there is a separate reason Auer
    deference is not warranted here.
    “[N]ot every reasonable agency reading of a genuinely
    ambiguous rule should receive Auer deference.” Kisor,
    
    139 S. Ct. at 2416
    . Instead, “a court must make an
    independent inquiry into whether the character and context
    of the agency interpretation entitles it to controlling weight.”
    
    Id.
     (citing Christopher v. SmithKline Beecham Corp.,
    
    567 U.S. 142
    , 155 (2012)). For example, courts will not
    defer to an agency’s interpretation when doing so “would
    seriously undermine the principle that agencies should
    provide regulated parties fair warning of the conduct [a
    regulation] prohibits or requires.” Barboza v. Cal. Ass’n of
    Prof’l Firefighters, 
    799 F.3d 1257
    , 1267 (9th Cir. 2015)
    (alteration in original) (quoting Christopher, 
    567 U.S. at 156
    ). This exception accounts for the “risk that agencies
    will promulgate vague and open-ended regulations that they
    can later interpret as they see fit, thereby ‘frustrat[ing] the
    notice and predictability purposes of rulemaking.’”
    34                  AMAZON.COM V. CIR
    Christopher, 
    567 U.S. at 158
     (quoting Talk Am., Inc. v.
    Michigan Bell Tel. Co., 
    564 U.S. 50
    , 68 (2011) (alteration in
    original) (Scalia, J., concurring)).
    Christopher and Barboza thus teach that the timing of an
    agency’s first announcement of its interpretation may be
    dispositive on whether the agency’s view will be given Auer
    deference. Here, the Commissioner does not identify a
    specific document (e.g., policy manual or court brief)
    definitively expressing the agency’s view of its regulations.
    It thus appears that the Commissioner’s court briefs in this
    case present Treasury’s “first announce[ment of] its view,”
    see Christopher, 
    567 U.S. at 153
    , that the definition of
    intangible in § 1.482-4(b) embraces residual-business assets.
    The exception to Auer deference from Christopher and
    Barboza therefore applies. “Where an agency announces its
    interpretation for the first time in an enforcement
    proceeding, and has not previously taken any action to
    enforce that interpretation, ‘the potential for unfair surprise
    is acute.’” Barboza, 799 F.3d at 1267 (quoting Christopher,
    
    567 U.S. at 158
    ). Even if first arising before the current
    litigation, a new interpretation is owed no deference if it
    would “create[] ‘unfair surprise’ to regulated parties.”
    Kisor, 
    139 S. Ct. at
    2417–18 (quoting Long Island Care at
    Home, Ltd. v. Coke, 
    551 U.S. 158
    , 170 (2007)). No
    statement from Treasury in the drafting history of the
    1994/1995 regulations expresses the position the
    Commissioner advances now. Indeed, as discussed above,
    Treasury’s contemporaneous explanations of the regulations
    are to the contrary. Amazon and other taxpayers were thus
    not given fair warning of the Commissioner’s current
    interpretation of the regulatory definition of an “intangible.”
    That interpretation is not entitled to deference.
    AMAZON.COM V. CIR                      35
    IV.
    The Commissioner’s calculation of AEHT’s buy-in
    under the cost sharing arrangement included residual-
    business assets as part of Amazon’s pre-existing intangibles.
    The language of the (now-superseded) regulatory definition
    of an “intangible” is ambiguous and could be construed as
    including residual-business assets. But the drafting history
    of the regulations and other indicators of Treasury’s
    contemporaneous intent strongly favor Amazon’s proffered
    meaning—that intangibles were limited to independently
    transferrable assets. Treasury appears to have changed its
    position on the meaning of the regulation after Amazon and
    AEHT entered into their cost sharing arrangement. We share
    the sentiment reflected in the concurring opinion in Xilinx:
    Indeed, I am troubled by the complex,
    theoretical nature of many of the
    Commissioner’s arguments trying to
    reconcile the two regulations. Not only does
    this make it difficult for the court to navigate
    the regulatory framework, it shows that
    taxpayers have not been given clear, fair
    notice of how the regulations will affect
    them.
    Xilinx, 
    598 F.3d at 1198
     (Fisher, J., concurring). We
    therefore agree with the tax court that the former regulatory
    definition of an “intangible” does not include residual-
    business assets.
    AFFIRMED.