National Grid Holdings, Inc. v. Commissioner of Revenue , 89 Mass. App. Ct. 506 ( 2016 )


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    14-P-1662                                                Appeals Court
    NATIONAL GRID HOLDINGS, INC., & others1        vs.   COMMISSIONER OF
    REVENUE.
    No. 14-P-1662.
    Suffolk.       December 11, 2015. - June 8, 2016.
    Present:    Cypher, Carhart, & Blake, JJ.
    Taxation, Abatement, Corporate excise, Accounting principle.
    Public Utilities. Debt. Corporation, Stock. Evidence,
    Settlement offer.
    Appeal from a decision of the Appellate Tax Board.
    John S. Brown (Donald-Bruce Abrams with him) for the
    taxpayers.
    Brett M. Goldberg for Commissioner of Revenue.
    CYPHER, J.       The plaintiffs, National Grid Holdings, Inc.
    (NGHI), National Grid USA (NGUSA), and National Grid USA Service
    Company, Inc. (NG Service) (collectively, taxpayers), appeal
    from a decision of the Appellate Tax Board (board) in favor of
    1
    National Grid USA and National Grid USA Service Company,
    Inc.
    2
    the defendant, Commissioner of Revenue (commissioner), on the
    taxpayers' claims for an abatement of corporate excise for the
    tax year ended March 31, 2002.    Primarily at issue is whether
    certain financing transactions, referred to as deferred
    subscription arrangements (DSAs), among various subsidiaries of
    National Grid plc (NGPLC), constituted true indebtedness so that
    the interest paid thereon qualified for the deduction allowed
    under the Massachusetts taxation of corporations statute, G. L.
    c. 63, § 30(4).
    NGPLC is a British electric and gas utility company that
    owns numerous entities in the United States (U.S.), the United
    Kingdom (U.K.), and beyond (collectively, National Grid).     The
    DSAs were financing arrangements designed by National Grid to
    take advantage of the differences in the U.S. and U.K. tax
    codes.2    National Grid attempted to cast the transactions as
    indebtedness under U.S. State and Federal tax laws, thereby
    reducing National Grid's tax liability in the U.S., and as
    equity, under U.K. law, thereby reducing its taxable income in
    the U.K.    Of overriding concern was the avoidance of any
    appearance of indebtedness in the U.K., where a debenture
    between a U.K. entity and its foreign subsidiary is strictly
    2
    The strategy, referred to as international tax arbitrage,
    is a tax planning technique in which a multinational corporation
    seeks to take advantage of differences in the tax laws of two
    countries to gain a tax advantage.
    3
    prohibited by statute, under threat of criminal sanctions.3      To
    that end, National Grid drafted the DSAs as agreements among
    various related entities to sell and repurchase shares of stock,
    maintaining in these proceedings that the mandatory nature of
    the stock repurchase constituted debt under Massachusetts
    corporate tax law.
    "We will not modify or reverse a decision of the board if
    the decision is based on both substantial evidence and the
    correct application of the law."    Boston Professional Hockey
    Assn. v. Commissioner of Rev., 
    443 Mass. 276
    , 285 (2005).      We
    find no error with the board's determination that the taxpayers
    failed to satisfy their burden of proving that the critical
    provisions of the DSAs, upon which they rely, gave rise to an
    unqualified obligation to repay.    Accordingly, their claimed
    deductions for interest payments under the DSAs were properly
    rejected, as was their claim that the DSAs constituted a
    liability in calculating net worth.
    Background.     We summarize the factual and procedural
    background from the board's very thorough account, provided in
    its June 4, 2014, findings of fact and report, which we
    supplement from the record where appropriate.
    3
    Under that statute, a debenture is defined as any document
    that created, acknowledged, or evidenced a debt, as determined
    with reference to English common law.
    4
    National Grid entered the U.S. utility market in 1998, when
    it acquired New England Electrical System (NEES) and, shortly
    thereafter, Eastern Utilities Association (EUA).   Pursuant to
    the acquisition, National Grid General Partnership (NGGP) became
    the parent of the U.S. group and NEES merged with NGUSA.      In
    order to achieve tax efficiency in the purchase, National Grid
    created a domestic reverse hybrid, a tax structure whereby the
    U.S. entity was taxable as a corporation in the U.S. but was
    transparent, for tax purposes, in a foreign country.4   The
    domestic reverse hybrid was part of a thirty-three-step process
    known as Project Mayflower, by which National Grid acquired NEES
    and EAU.   National Grid used existing affiliates, and also
    created several U.K. and U.S. entities in the process that
    issued various intercompany loans to finance the acquisition of
    NEES and EUA and permitted National Grid to claim interest
    deductions in the U.S.
    In February, 2001, the U.S. Treasury proposed regulations
    to restrict the use of domestic reverse hybrids.   Under the new
    regulations, the interest payments made by the National Grid
    subsidiary would be treated as payment of dividends and subject
    to U.S. tax withholding.   In the face of the proposed changes,
    4
    NGGP did so by electing to be treated as a corporation in
    the U.S., able to deduct interest it paid on loans on its U.S.
    tax returns, without a corresponding recognition of income in
    the U.K.
    5
    National Grid sought to replace the domestic reverse hybrid with
    a different structure that would maintain its tax advantages,
    that is, the deductibility of interest payments in the U.S., and
    avoidance of income recognition in the U.K.   Also to be avoided
    was running afoul of §§ 765-766 of the United Kingdom Income and
    Corporation Taxes Act 1988 (§ 765), which prohibits debentures
    between U.K. entities and foreign subsidiaries, and which
    carries criminal penalties.
    The result was known as Project Spam and Project Spa.
    Project Spam was a forty-seven-step series of transactions that
    refinanced the $2.68 billion indebtedness incurred in the NEES
    acquisition.   Project Spa was a forty-four-step series of
    transactions created soon after the Project Spam financing to
    finance National Grid's acquisition of Niagara Mohawk Holdings,
    Inc. (Niagara Mohawk), a New York utility company.   The projects
    utilized the DSAs, which were structured as stock purchases, to
    retain the interest deductions and other tax benefits of the
    domestic reverse hybrid while avoiding creation of a debenture,
    as prohibited under U.K law.   The relevant documents and
    provisions of the two projects being similar, we principally
    focus on Project Spam.
    National Grid Eight Limited (NG8), was a U.K. entity
    created as part of Project Spam.   The NG8 DSA was designed to
    reflect NGHI's $2.68 billion of outstanding debt for U.S tax
    6
    purposes.   We are directed to three documents critical to the
    dispute:    the articles of association of NG8 (articles); a
    December 20, 2001, offer for subscription of ordinary share
    capital; and an agreement for the sale and purchase of shares in
    NG8 (S&P agreement).    The offer letter extended to NGHI the
    opportunity to subscribe for 10 million shares of NG8, for
    $2.695 billion, with an initial payment of $15 million and three
    additional payments, referred to as call payments, on or after
    the dates and in the amounts specified in the NG8 article.       NG8
    could make those calls only in the amounts and on dates
    specified in the documents.    The offer letter required that any
    acceptance be oral, thereby avoiding a document that might be
    construed as a debenture under § 765.
    Upon NGHI's oral acceptance of the offer, NGHI paid $15
    million to NG8 for 10 million NG8 shares, and then sold the
    shares for $2.695 billion to National Grid (US) Investments 4
    (NGUSI4).   NGHI used the proceeds, totaling $2.68 billion
    ($2.695 billion minus the $15 million it paid to NG8), to repay
    the loans for Project Mayflower, now refinanced.
    As noted, the articles provided that NG8 could make calls
    on NGHI for four call payments on or after specified dates.      The
    first three payments represented interest, and the final payment
    was principal and interest.    The S&P agreement provided that
    NGHI remain liable for the call payments, and that if NG8 failed
    7
    to make a call according to the schedule in the articles, NGHI
    was entitled to procure, through NGUSI4, that NG8 make the call
    (thereby avoiding interest at a higher rate).     However, NGHI was
    under no obligation to exercise that right.
    At the heart of this dispute is the nature of NGHI's
    obligation to repurchase the NG8 shares, and whether that
    obligation constituted the repayment of a debt, as determined by
    whether NGHI4's service of the notice to repurchase was
    discretionary or mandatory.     Clause 2.9 of the S&P agreement
    provided that if NGHI failed to make a call payment within seven
    days of the call, or if NG8 made no call and NGHI failed to
    exercise its right to procure a call, NGUSI4 was "entitled to
    serve a notice" on NGHI requiring NGHI to repurchase the [NG8]
    shares.     The parties agree that, under clause 2.9, NGUSI4's
    right to serve notice requiring NGHI to repurchase the shares
    was discretionary, as per the "shall be entitled to serve"
    language.    Hence, clause 2.9 did not impose an unqualified
    obligation on NGHI to repurchase the shares.
    The parties' disagreement centers on clause 2.10 of the S&P
    agreement.    We set forth clause 2.10 in its entirety:
    "If for any reason whatsoever any sums due in respect
    of the [s]hares under [a]rticle 3 of the [a]rticles remain
    unpaid after 19 December[,] 2004, the [b]uyer shall serve a
    notice on the [s]eller requiring the [s]eller to repurchase
    the [s]hares on 20 December[,] 2004[,] or if this is not a
    [b]usiness [d]ay, the next [b]usiness [d]ay thereafter for
    a consideration equal to the net asset value of the
    8
    [c]ompany (as determined in accordance with clauses 2.11 to
    2.14) and the aggregate of any sums remaining unpaid in
    respect of the [s]hares less the amount of any called up
    share capital not paid, and such consideration shall be
    paid in cash against delivery of a duly executed transfer
    on behalf of the [b]uyer in favour of the [s]eller and the
    delivery of the relevant share certificate. If the [b]uyer
    exercises its rights under this clause and the [s]eller
    fails to complete the repurchase of the [s]hares at the
    time specified by the [b]uyer[,] the consideration due
    shall bear interest for the period from and including the
    date on which the failure to complete the repurchase has
    occurred up to the date of the actual payment (after as
    well as before judgment) at the rate which is the aggregate
    of [four] percent per annum above the base rate from time
    to time of Barclays Bank plc. The interest will accrue
    from day to day and shall be payable on demand and shall be
    compounded monthly in arrears provided that no interest
    shall accrue under this clause 2.10 where interest is
    accruing under [a]rticle 3 of the [a]rticles."
    The parties debate the interpretation of clause 2.10, and
    whether it required NGHI4, as the buyer, to serve notice to
    repurchase, or whether NGHI4 merely had the right to serve
    notice to repurchase.   According to National Grid, clause 2.10
    establishes that NGHI4 was required to serve notice to
    repurchase and, as such, imposed on NGHI an unqualified
    obligation to repurchase the shares -- and hence, repay a debt.5
    A month after Project Spam's implementation, Project Spa
    was carried out, consisting of forty-four steps, through which
    National Grid acquired Niagara Mohawk.   The DSA components of
    5
    In reality, all of the calls and call payments were made
    prior to the applicable call default dates, and thus no notice
    to repurchase the shares was actually issued. Interest paid on
    the call payments was disbursed to National Grid entities
    outside of the U.S.
    9
    Project Spa were similar to those for Project Spam, except for
    the companies involved, the dates, the number of shares, and the
    dollar amounts.   Significant here, NGUSA filed a separate
    corporate excise return claiming a deduction in computing its
    taxable net worth for a liability for costs associated with the
    Niagara Mohawk acquisition.
    NG Service was the principal reporting corporation for NGHI
    and NGUSA for Massachusetts tax purposes.   For the tax year
    ending March 31, 2002, the taxpayers deducted the interest
    payments made under the DSAs, treating the DSAs as indebtedness.
    Similarly, NGHI treated the DSAs as deductible for purposes of
    calculating taxable net worth.   The commissioner made additional
    assessments of corporate excise for the year ending March 31,
    2002.   The taxpayers filed applications for abatement, which the
    commissioner denied.
    The taxpayers appealed the denial to the board, which held
    fifteen days of hearings and issued its findings of fact and
    report dated June 4, 2014.    The board ruled that clause 2.10 did
    not mandate that NGHI4 serve notice to repurchase the NG8
    shares, and was at best ambiguous as to whether NGHI4 was
    obligated to serve notice to repurchase or whether it merely
    possessed the right to serve such notice.   The board concluded
    that the DSAs did not constitute true indebtedness and that the
    taxpayers were not entitled to the claimed interest deductions,
    10
    nor were they entitled to deduct the DSAs as a liability in
    computing taxable net worth.     The board also denied the
    deductions for certain costs claimed in connection with the
    acquisition of Niagara Mohawk.     The taxpayers filed this appeal.6
    Discussion.     1.   Standard of review.   The standard of
    review is the parties' first point of contention.       It is well
    established that "[a] decision of the board will not be reversed
    or modified if it is based on substantial evidence and on a
    correct application of the law."     Koch v. Commissioner of Rev.,
    
    416 Mass. 540
    , 555 (1993).     National Grid maintains that the
    board's interpretation of the DSAs is a question of law subject
    to de novo review.     It is true that contract interpretation is
    ordinarily a question of law.     See Robert Indus., Inc. v.
    Spence, 
    362 Mass. 751
    , 755 (1973).      But it has also been
    observed that the question whether the taxpayers intended that a
    contractual arrangement obligate them to repay a debt is an
    issue of fact, see New York Times Sales, Inc. v. Commissioner of
    Rev., 
    40 Mass. App. Ct. 749
    , 752 (1996), and that the board's
    findings of fact are final.     See Kennametal, Inc. v.
    Commissioner of Rev., 
    426 Mass. 39
    , 43 (1997).       We may look at
    6
    The taxpayers also filed a related appeal, National Grid
    USA Serv. Co. v. Commissioner of Rev., 89 Mass. App.
    Ct.         (2016), which concerns the effect of a closing
    agreement entered into between the taxpayers and the Internal
    Revenue Service.
    11
    whether the evidence is sufficient to support the board's
    conclusions of law, but our review in that regard "is limited to
    'whether a contrary conclusion is not merely a possible but a
    necessary inference from the findings.'"     Ibid., quoting from
    Commissioner of Rev. v. Houghton Mifflin Co., 
    423 Mass. 42
    , 43
    (1996).
    We therefore consider whether the board applied the correct
    legal standard in interpreting the relevant documents and
    whether its conclusion that the DSAs did not constitute
    indebtedness was supported by substantial evidence.
    2.    Unqualified obligation to repay.    The board applied the
    correct legal standard in defining debt as "an unqualified
    obligation to pay a sum certain at a reasonably close fixed
    maturity date along with a fixed percentage in interest payable
    regardless of the debtor's income or lack thereof."     Overnite
    Transp. Co. v. Commissioner of Rev. 
    54 Mass. App. Ct. 180
    , 186
    (2002), quoting from Gilbert v. Commissioner of Int. Rev. 
    248 F.2d 399
    , 402 (2d Cir. 1957).   In considering whether the DSAs
    qualified as debt, the board appropriately looked to the
    language of the DSAs as well as the circumstances of their
    creation and performance.   See New York Times Sales, Inc., 
    supra at 752-753
    ; Overnite Transp. Co., supra.     See also Shea v. Bay
    State Gas. Co., 
    383 Mass. 218
    , 222-223 (1981), quoting from
    United States v. Seckinger, 
    397 U.S. 203
    , 213 n.17 (1970)
    12
    ("[c]ontract interpretation is largely an individualized
    process, with the conclusion in a particular case turning on the
    particular language used against the background of other indicia
    of the parties' intention").7
    We begin with the text.    As noted, the central issue is
    whether the service of the repurchase notice under clause 2.10
    was mandatory or merely a right and, therefore, whether NGHI's
    obligation to repurchase shares under the DSA, and thereby repay
    the funds, was an unqualified one.    The board ruled that the
    DSAs did not mandate service of notice to repurchase the shares
    and so did not reflect an unqualified obligation to repay on the
    part of NGHI.
    National Grid maintains that the board misconstrued clause
    2.10 as not imposing a mandatory requirement that NGHI4 serve a
    repurchase notice if the DSAs were not repaid by the final call
    default dates.   National Grid points to use of the word "shall"
    in the first sentence of clause 2.10 in regard to serving the
    repurchase notice as plainly setting forth a requirement that
    NGHI4 serve the notice to repurchase if amounts remained
    outstanding as of the date specified, and triggering NGHI's
    7
    The board also referenced the list of factors set out in
    Fin Hay Realty Co. v. United States, 
    398 F.2d 694
    , 696 (3d Cir.
    1968), but noted that, under that analysis, certain facts
    supported the taxpayers' argument while others cut against it.
    The board instead rested its decision on the lack of an
    unqualified obligation to repay, to be discussed, infra.
    13
    obligation to repay upon receipt of that notice.   The board
    pointed to the second sentence of clause 2.10, which speaks in
    terms of exercising a right, suggesting that NGHI4 was not
    required to serve notice, but instead had the right to serve
    notice, at its discretion.   The board concluded that, at best,
    clause 2.10 was ambiguous on the issue and rejected National
    Grid's argument largely on that basis.
    National Grid challenges the board's ruling that the
    meaning of clause 2.10 was ambiguous as to the mandatory
    character of the notice.   A contract is ambiguous "where the
    phraseology can support reasonable difference of opinion as to
    the meaning of the words employed and the obligations
    undertaken."   President & Fellows of Harvard College v. PECO
    Energy Co., 
    57 Mass. App. Ct. 888
    , 896 (2003), quoting from
    Suffolk Constr. Co. v. Lanco Scaffolding Co., 
    47 Mass. App. Ct. 726
    , 729 (1999).   Contrary to National Grid's assertion, the
    board did not rest its conclusion of an ambiguity solely on the
    use of the word "shall" in clause 2.10 and whether it referred
    to the mandatory nature of the notice or to the date on which
    notice, if given, had to be served.   The board specifically
    pointed to the second sentence of 2.10, and the discretionary
    nature of a right to give notice.
    The board's ruling, that clause 2.10 is ambiguous, is a
    correct application of law and is supported by substantial
    14
    evidence.   We therefore concur with the board's finding.        See
    Browning-Ferris Indus., Inc. v. Casella Waste Mgmt. of Mass.,
    Inc., 
    79 Mass. App. Ct. 300
    , 307 (2009).     The curious
    inconsistency between the language employed in the first
    sentence -- indicating "the [b]uyer shall serve" -- and the
    second sentence -- which speaks of a right in the phrase "if the
    [b]uyer exercises its rights," undercuts the taxpayers'
    interpretation of 2.10 as setting forth a mandatory obligation.
    The plain and ordinary meaning of a right, particularly in the
    context of "if" a right is exercised, in no way connotes a
    requirement or obligation to do anything.8    See Bailey v. Astra
    Tech, Inc., 
    84 Mass. App. Ct. 590
    , 594 (2013) (words of contract
    are interpreted according to their "plain meaning").       The
    incongruity between the first sentence and the second sentence
    in clause 2.10 renders the clause ambiguous on its face, because
    under the second sentence, the obligation to repurchase the
    shares was not an unqualified one; it depended on whether the
    right to serve the final repurchase notice was exercised.         See,
    e.g., Post v. Belmont Country Club, Inc., 
    60 Mass. App. Ct. 645
    ,
    652 (2004), quoting from Fashion House, Inc. v. K Mart Corp.,
    8
    Various definitions of a "right" include "something to
    which one has a just claim," such as "a power or privilege
    vested in a person by the law," or "a legally enforceable claim
    against another," or "a capacity or privilege the enjoyment of
    which is secured to a person by law." Webster's Third New
    International Dictionary (1993).
    15
    
    892 F.2d 1076
    , 1083 (1st Cir. 1989) ("Contract language is
    ambiguous where 'an agreement's terms are inconsistent on their
    face or where the phraseology can support reasonable difference
    of opinion as to the meaning of the words employed and
    obligations undertaken'").
    National Grid argues that, upon concluding that clause 2.10
    was at best ambiguous, the board should have resolved the
    ambiguity by reference to extrinsic evidence, in particular the
    "preliminary negotiations, the conduct of the parties, and
    interviews between them after the contract is executed," citing
    Rizzo v. Cunningham, 
    303 Mass. 16
    , 21 (1939).   In resolving an
    ambiguity, however, the board was entitled to evaluate the
    parties' circumstances as well as intentions at the time of
    formation.   See Castricone v. Mical, 
    74 Mass. App. Ct. 591
    , 599
    (2009).   In essence, National Grid is arguing that the board
    should have given more weight to evidence that favored National
    Grid's interpretation, in particular the testimony of a National
    Grid employee and a memorandum from its tax advisers, that
    clause 2.10 was drafted to require mandatory service of the
    repurchase notice.
    Contrary to National Grid's assertion, the board did not
    apply an improper legal standard in according little weight to
    evidence of the subjective intent of National Grid employees and
    tax advisors.   First, the weight of the evidence, the inferences
    16
    to be drawn therefrom, and the credibility of the witnesses are
    all matters for the board.     See Kennametal, Inc., 426 Mass. at
    43 n.6.   And particularly in this instance, where related
    entities were on both sides of the transactions, the board was
    not required to credit evidence of the taxpayers' subjective
    intent.   "[M]ere declarations by the parties that they intend a
    certain transaction to constitute a loan is insufficient if it
    fails to meet more reliable indicia of debt which indicate the
    'intrinsic economic nature of the transaction.'"     Alterman
    Foods, Inc. v. United States, 
    505 F.2d 873
    , 877 (5th Cir. 1974),
    quoting from Fin Hay Realty Co. v. United States, 
    398 F.2d 694
    ,
    697 (3d Cir. 1968).     In cases like this, "courts look with great
    care to the surrounding facts and view with some suspicion
    declarations of intent which have the effect of maximizing the
    tax benefit."   
    Ibid.
       Where the entities involved are under
    common control, the fact that "all the formal indicia of an
    obligation were meticulously made to appear," may be entitled to
    less weight, as the drafters "had the power to create whatever
    appearance would be of tax benefit to them despite the economic
    reality of the transaction."    Fin Hay Realty Co., supra.
    By the same token, the board was entitled to reject
    National Grid's explanation of its use of the phrase "if the
    [b]uyer exercises its rights."    National Grid's expert, Graham
    Aaronson, who was qualified as an expert in English commercial
    17
    law and U.K. tax law, explained the second sentence of clause
    2.10, "if the [b]uyer exercises its rights," as simply meaning
    "if this clause applies."   But if that is all that was meant,
    the drafters could have said so, in far simpler language.    See,
    e.g., Jefferson Ins. Co. of N.Y. v. Holyoke, 
    23 Mass. App. Ct. 472
    , 476 (1987) (contract's plain language will not be distorted
    where parties could have used appropriate language to indicate
    different intent).9   The board could consider that these were
    sophisticated taxpayers whose tax advisors carefully drafted the
    transactions so as to yield the most beneficial tax
    consequences.   See, e.g., Estate of Leavitt v. Commissioner of
    Internal Rev., 
    875 F.2d 420
    , 424 (4th Cir. 1989) ("It must be
    borne in mind that we do not merely encounter naive taxpayers
    caught in a complex trap for the unwary").   Giving the phrase
    "if the [b]uyer exercises its rights" its plain and ordinary
    meaning, the phrase does not harmonize with the "shall serve"
    language of the first sentence of clause 2.10 if the service of
    notice was intended to be mandatory.
    Rather than relying on the taxpayers' declarations of
    intent, the board appropriately looked to "the more reliable
    criteria of the circumstances surrounding the transaction."
    Alterman Foods, Inc., supra.   Principal among these, according
    9
    National Grid's attempt to ignore the clause's second
    sentence, and relegate it to a footnote in its brief, does not
    strengthen its cause.
    18
    to testimony of the experts for both sides, was the legal
    context in which the DSAs arose.   The record establishes that
    the DSAs were designed to take advantage of the deduction
    allowed for interest on indebtedness under U.S. tax laws, while
    avoiding taxable income on the interest payments to the U.K.
    recipient.
    Even more significant, according to the testimony of the
    parties' respective U.K tax law experts, Malcolm Gammie and
    Graham Aaronson, the overriding concern in drafting the DSAs was
    to avoid the appearance of debt under U.K. law.    Both experts
    testified that avoidance of any writing evincing debt was
    paramount for purposes of § 765, because the statute imposes
    criminal sanctions on the directors of a U.K. corporation for a
    debenture issued by a nonresident subsidiary.    The primacy of
    the taxpayers' concern to avoid a document evincing a debt was
    repeatedly emphasized by the expert witnesses.
    In particular, Aaronson testified that, for that reason, "a
    rather cumbersome process" was utilized to make it impossible
    for the U.K. tax authority to argue there was a debenture.     The
    transactions were deliberately designed with indeterminate dates
    and methods of payment, and with amounts due only upon notice
    given, and in the form of an asset repurchase rather than
    repayment.   According to Aaronson, it would be impossible for
    the U.K. authorities to view this contingency as a debt.
    19
    Aaronson further testified that § 765 carried sanctions and was
    taken very seriously, that taxpayers in general, and National
    Grid in particular, were highly concerned about the possibility
    of issuing a debenture subject to § 765, and that a taxpayer
    would go to great lengths to avoid it.
    The board specifically referenced Aaronson's testimony in
    describing avoidance of § 765 as "the essence of the tax
    planning" in these projects, and that "cumbersome mechanisms"
    were put in place so that the U.K. tax authority "would not be
    able to identify any document or combination of documents as
    giving rise to indebtedness created or evidenced" by the
    documents.
    Malcolm Gammie, the commissioner's expert on U.K. law,
    similarly testified that the taxpayer would want absolute
    assurance that the transaction would not breach § 765.     Gammie
    also testified that it was the essence of the transaction to
    avoid problems with § 765, noting, for example, that the
    subscription letter required oral acceptance.
    In the end, the board rejected National Grid's argument
    that the repurchase notice under clause 2.10 should be
    interpreted as mandatory.   The board specifically found that
    "clause 2.10 could not be construed as compelling service of a
    notice to repurchase or, in turn, payments by NGHI."     To the
    extent the board ruled the clause ambiguous, the board was
    20
    entitled to rule against the taxpayers, based on its findings
    concerning the circumstances surrounding the DSAs, the
    taxpayers' intentions in the context of an international tax
    arbitrage, and the board's assessment of the witnesses'
    credibility.    See Castricone, 74 Mass. App. Ct. at 600, quoting
    from Edinburg v. Edinburg, 
    22 Mass. App. Ct. 199
    , 203 (1986)
    ("Where there are two permissible views of the evidence, the
    factfinder's choice between them cannot be clearly erroneous").
    We observe, as well, that it was the taxpayers who had the
    burden of proof on every material fact regarding their right to
    an abatement.    See IDC Research, Inc. v. Commissioner of Rev.,
    
    78 Mass. App. Ct. 352
    , 358 (2010).     It was therefore the
    taxpayers' burden to prove that the DSAs constituted an
    unqualified obligation to repay, and the board properly could
    find that the taxpayers' burden was not met with documents,
    drafted by them, that were ambiguous on that very point.      See
    Estate of Leavitt, 
    875 F.2d at 424
     (taxpayer's burden to prove
    debt is especially difficult to meet where "transaction is cast
    in sufficiently ambiguous terms to permit argument either way
    depending on which is subsequently advantageous from tax point
    of view").     This is in keeping with the general rule that an
    ambiguous contract is construed against its author, which "rests
    upon the practical and fair premise that the drafter had the
    capacity and opportunity for clear expression and that he should
    21
    bear the detriment of unclear expression."   Air Plum Island,
    Inc. v. Society for the Preservation of New England Antiquities,
    
    70 Mass. App. Ct. 246
    , 253 (2007).
    We reject National Grid's alternative argument that, even
    if not mandatory, NGHI's right to serve a notice to repurchase
    the shares on a fixed date was sufficient, in itself, to
    establish an unconditional obligation to repay.   The Federal
    cases on which National Grid relies do not bear that out.    See,
    e.g., Jewel Tea Co. v. United States, 
    90 F.2d 451
    , 453 (2d Cir.
    1937) (while there cannot be debt in the absence of an
    unconditional right to demand payment at a fixed time, the
    presence of such a right does not, in all circumstances, mean
    shares are debts); Merck & Co. v. United States, 
    652 F.3d 475
    ,
    483 (3d Cir. 2011) (formal, explicit unconditional obligation to
    repay was not an absolute prerequisite where an interest rate
    "swap" was structured "to ensure repayment of funds as a
    practical matter").   National Grid fails to persuade us that the
    DSAs were structured so as to ensure that the shares were
    repurchased or that the mere right to give notice to repurchase
    rendered the obligation to repay an unqualified one.
    3.   DSAs as liabilities for computing taxable net worth.
    NGHI was subject to tax on its taxable net worth pursuant to
    c. 63, § 30(11).   NGHI argues that it was entitled to treat the
    DSAs as debt and, accordingly, as liabilities deductible from
    22
    its total assets in computing its taxable net worth.     The board
    deemed the argument moot, based on its ruling that the DSAs were
    not debt and, as such, could not be considered liabilities in
    determining net worth.   See, e.g., Overnite Transp. Co., 54
    Mass. App. Ct. at 180.
    National Grid presses the significance of the fact that
    NGHI treated the DSAs as liabilities on NGHI's financial
    statements.   Relying on Xtra, Inc., 
    380 Mass. 277
    , 280-281
    (1980), National Grid maintains that the net worth assessment
    should be consistent with the manner in which the taxpayer
    actually accounted for the liability on its own books.     The
    reference in that case, however, was to a generally accepted
    accounting principle, and not to an individual taxpayer's
    particular method of accounting for a given expense, however
    erroneous.
    In Xtra, Inc., for example, the Court recognized the
    accounting practice of accelerating depreciation on personal
    property in computing income tax liability, and affirmed the
    taxpayer's inclusion of its future obligation to pay the income
    tax it deferred, through accelerating the depreciation
    deductions, as a liability.   The holding was a narrow one:      "[A]
    corporation which takes accelerated depreciation may treat the
    income taxes deferred thereby as a liability."   
    Id. at 278
    .      We
    will not extend the outcome in that case to the present
    23
    situation to allow the taxpayer's characterization of the DSAs
    as a debt to dictate the central issue of their tax treatment
    for purposes of calculating taxable net worth.    And as the board
    recognized in Xtra, Inc., even "a generally accepted accounting
    principle, 'of itself and standing alone, cannot necessarily
    dictate the result in tax cases.'"   
    Id. at 281
    , quoting from
    First Fed. Sav. & Loan Assn. v. State Tax Commn., 
    372 Mass. 478
    ,
    483 (1977), aff'd, 
    437 U.S. 255
     (1978).
    Indeed, First Fed. Sav. & Loan Assn., is more to the point.
    In deciding whether dividend and interest payments made to
    members of a savings and loan association were deductible as
    operating expenses, the Supreme Judicial Court reasoned that
    there was no basis "for assuming that the Legislature intended
    to import accounting practice into its statutory language and
    thus to permit accounting principles to be the guide to the
    meaning of the words 'operating expenses.'"    Id. at 483.
    Determining that the taxpayer's members were more akin to
    investors than creditors, the court concluded that payments to
    them represented dividends rather than debt.    Id. at 484-485.
    We agree with the board that the DSAs could not properly be
    treated as debt and, hence, as liabilities, and we see no reason
    to revisit the outcome implicit in Overnite Transp. Co., supra,
    that the determination of indebtedness for purposes of interest
    deductions resolved the issue for calculating net worth as well.
    24
    4.   The U.K. stamp duty.    NGUSA claimed a deduction in
    computing its taxable net worth for costs associated with the
    acquisition of Niagara Mohawk.    The board rejected certain of
    those expenses for lack of proof that they were incurred in
    connection with the acquisition.    The board further reasoned
    that the taxpayers did not show that NGUSA itself paid the
    costs, that according to the evidence, some were paid by U.K.
    entities while others were paid by NEES.
    On appeal, National Grid claims that it offered sufficient
    proof that NGUSA paid a $26.5 million liability for U.K. stamp
    tax duty in connection with the Niagara Mohawk acquisition, that
    the amount was recorded on NGUSA's books, and that it was
    properly allocated to NGUSA.    National Grid's witness, John
    Cochrane, who served as the chief financial officer for National
    Grid's U.S. businesses at the time of the acquisition, testified
    that the stamp tax was paid by NGPLC, and that NGUSA repaid
    NGPLC for that amount five years later.    While the testimony
    confirms that NGUSA paid the U.K. entity the stamp tax amount
    some five years after the transaction, it was unclear from the
    evidence why the expense was NGUSA's liability.
    The board emphasized that it was the taxpayers' burden to
    demonstrate that the expenses claimed as liabilities in
    calculating NGUSA's net worth were properly allocated to NGUSA
    and were actually paid by NGUSA.    The board found that "neither
    25
    Mr. Cochrane's testimony nor the record as a whole provided
    sufficient credible evidence to establish either fact," and,
    based on our review of the record, and our deference to the
    board's role in weighing the evidence and assessing witness
    credibility, we find no error.
    National Grid further argues that there was proof in the
    record that NEES had merged into NGUSA after being acquired by
    National Grid, so that NEES and NGUSA were the same legal entity
    and that expenses paid by NEES were liabilities of NGUSA for net
    worth purposes.   According to the board, however, Cochrane did
    not explain why NEES was the source of the payments for which
    NGUSA claimed liability, and it was the taxpayer's burden to
    establish each fact necessary to its claim for an abatement.
    See, IDC Research, Inc., 78 Mass. App. Ct. at 358.
    5.   Closing agreement.   National Grid sought to introduce a
    document entitled "Department of the Treasury Internal Revenue
    Service Closing Agreement on Final Determination Covering
    Specific Matters," (closing agreement), between the Internal
    Revenue Service (IRS) and NGHI that, according to National Grid,
    included a final determination of NGHI's interest deductions for
    the tax year at issue.   The question whether the closing
    agreement between the taxpayers and the IRS was binding as to
    the interest deductions allowable under Massachusetts law is the
    subject of a separate appeal.    Here, National Grid argues that,
    26
    even if not binding, the closing agreement still should have
    been admitted.   National Grid claims that the adjustments made
    by the IRS in interest deductions pursuant to the closing
    agreement are relevant to determining the taxpayers'
    Massachusetts tax liability.
    We agree with the board's ruling that, for evidentiary
    purposes, the closing agreement constituted the settlement of a
    claim, and the board did not abuse its discretion in excluding
    it.   See Morea v. Cosco, Inc., 
    422 Mass. 601
    , 603-604 (1996) (no
    evidence of settlement is admissible to prove liability or the
    amount of a claim).   See generally Zucco v. Kane, 
    439 Mass. 503
    ,
    507 (2003) (absent abuse of discretion or other legal error,
    judge's ruling on evidence will not be disturbed).   Moreover, as
    the commissioner points out, in PMAG, Inc. v. Commissioner of
    Rev., 
    429 Mass. 35
    , 40-41 (1999), upon which National Grid
    relies, the admissibility of a closing agreement between the
    taxpayer and the IRS was not at issue.
    National Grid also complains that the board allowed the
    commissioner's posttrial motion to treat the closing agreement
    as impounded material in the record appendix.   However, it
    appears that National Grid failed to object when making its
    offer of proof to the procedure utilized by the board in
    accepting the closing agreement for identification and including
    it with the record in a sealed envelope.   The hearing transcript
    27
    suggests, rather, that National Grid concurred at that point.
    National Grid does not indicate why inclusion of the closing
    agreement in the record appendix in the same manner constitutes
    error.
    Conclusion.   Based on the foregoing, we conclude that the
    taxpayers failed to establish their right to abatements for the
    tax year in question.   The decision of the Appellate Tax Board
    is affirmed.
    So ordered.