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A distressed debt claim generating £18.1 million of UK withholding tax in issue, acquired through a broker in a back-to-back market trade where the seller did not know the identity of the buyer, and HMRC argued that the principal purpose of the entire transaction was to obtain a treaty benefit. That argument was rejected unanimously by the Court of Appeal in The Commissioners for HMRC v Burlington Loan Management DAC [2026] EWCA Civ 461, handed down on 20 April 2026, and the reasoning through which it was rejected carries implications extending well beyond the distressed debt market from which the dispute emerged. At the centre of the judgment lies a question with direct relevance for businesses operating across borders: where an arrangement reflects genuine commercial reality, what degree of significance should be attached to the fact that it also produces a treaty advantage the taxpayer understood and anticipated?
That question has assumed greater importance as Principal Purpose Tests and wider anti-abuse provisions have become more deeply embedded across international tax treaties, increasing the degree to which internationally active businesses find themselves navigating questions of commercial rationale, legal form and treaty outcomes simultaneously. Burlington arrives at a moment when courts are being asked with increasing frequency to examine how commercial reality, tax efficiency and allegations of treaty abuse should sit alongside one another, and the significance of the decision lies less in the distressed debt context itself than in the broader analytical framework the Court applied in resolving it.
The facts of Burlington emerged from the administration of Lehman Brothers International (Europe), where distressed debt claims were being bought and sold in a market shaped by uncertainty, pricing and the prospect of future recoveries. For investors operating in that environment, value depended on more than the legal strength of a claim, because timing, recoverability, market conditions and the economics of future payments could all influence what a rational purchaser was prepared to pay.
Burlington Loan Management DAC, an Irish resident designated activity company and the principal European investment vehicle of a New York headquartered asset manager, acquired a debt claim from SAAD Investments Company Limited, a Cayman Islands entity in liquidation. The transaction was executed through the broker Jefferies in a back-to-back market trade, with the seller agreeing commercial terms without knowing the identity of the ultimate purchaser. Approximately £90.8 million in post-administration interest had accrued on the claim, placing around £18.1 million of UK withholding tax directly in issue, and that figure mattered because the tax treatment of the interest had a direct bearing on the value of what was being acquired. Had the Cayman entity remained entitled to the payment, UK withholding tax would ordinarily have applied, but Burlington was an Irish resident entity capable of relying upon Article 12(1) of the United Kingdom Ireland Double Tax Treaty, under which qualifying Irish residents may receive interest free from UK withholding tax. A purchaser expecting to receive interest without a 20 per cent withholding tax deduction could justify paying more for the same claim because the anticipated economics of the investment looked materially different, and that commercial consequence sits at the centre of what HMRC challenged.
HMRC argued that Burlington's principal purpose in acquiring the claim was to secure the treaty benefit and that Article 12(5), the treaty's anti-abuse provision, therefore denied relief. The Court of Appeal was required to confront a question that reaches well beyond distressed debt markets: when a tax advantage forms part of the commercial rationale for a transaction and the taxpayer understood and anticipated that advantage at the point of acquisition, what significance should that fact ultimately carry in an abuse analysis?
The Court of Appeal unanimously dismissed HMRC's appeal, with Snowden LJ delivering the leading judgment, Falk LJ providing a concurring judgment containing additional observations and Zacaroli LJ agreeing with both. The decision followed earlier findings in Burlington's favour before the First-tier Tribunal and Upper Tribunal and provides a detailed judicial examination of how treaty anti-abuse provisions operate in the context of commercially driven cross-border arrangements.
HMRC's argument placed considerable emphasis on the role treaty benefits played in shaping the transaction, contending that Burlington had sought to take advantage of Article 12 in a manner falling within Article 12(5). The Court approached the issue through a different analytical lens, drawing on the earlier Court of Appeal decision in VietJet Aviation JSC v FW Aviation (Holdings) Limited [2025] EWCA Civ 783. Snowden LJ held that obtaining the benefit of a treaty provision does not, in itself, mean that a taxpayer has taken advantage of the treaty in an abusive sense, and that the enquiry required consideration of whether the benefit had been obtained in a way inconsistent with the object and purpose of the treaty. That distinction between obtaining a treaty benefit and abusing a treaty provision is the analytical core of the judgment, and it carries direct significance for businesses whose investment and financing decisions are taken with a clear understanding of the treaty framework through which they will operate, because treaty outcomes that influence pricing, expected returns and commercial strategy are part of the commercial landscape within which transactions are undertaken rather than evidence of abuse.
Snowden LJ addressed that issue directly at paragraph 97 of the judgment:
"It must follow, as Popplewell LJ held in Vietjet at paragraph 108, that without more, it cannot be an abuse for a taxpayer who is resident in one of the contracting states to acquire a debt-claim in the expectation that he will enjoy the very benefit of exemption from tax which the treaty expressly provides that someone in his position is to have."
The wider factual setting of the transaction carried considerable weight in the Court's analysis. The Court identified an arrangement with genuine commercial coherence, involving no entity inserted artificially into the structure for treaty purposes, and the debt claim had been acquired through a genuine market transaction negotiated at arm's length between independent parties through a broker. Those circumstances informed the Court's assessment of both purpose and commercial reality in a way that HMRC's counterfactual analysis was unable to displace. The Revenue had invited the tribunal to assess Burlington's purpose against a hypothetical scenario in which the debt assignment had never taken place, and the Court regarded that starting point as difficult to reconcile with a treaty provision expressly contemplating assignments of debt claims, while acknowledging that different considerations arise where arrangements involve connected parties or depart from ordinary commercial dealing.
Falk LJ's concurring judgment added an observation that is likely to carry significance in future disputes. Where a treaty or legislative framework intentionally confers a tax advantage, reliance upon that outcome does not automatically engage an anti-abuse provision, and both Snowden LJ and Falk LJ expressed reservations about interpreting treaty purpose tests primarily through domestic legal authorities, favouring an approach informed by international materials including OECD Commentary and the Vienna Convention on the Law of Treaties. The judgment leaves open the broader question of when a tax advantage moves beyond forming part of the commercial rationale for a transaction and begins to shape how the arrangement itself is characterised, and it is that question which the closing section of this article addresses directly.
The version of Article 12(5) considered in Burlington did not always appear in its current form. The original 1976 wording included an express carve out for arrangements undertaken for "bona fide commercial reasons", language removed by the 1998 Protocol (SI 1998/3151). That removal mattered because the anti-abuse provision no longer turned expressly upon whether a transaction could be characterised as commercially genuine, meaning that a transaction reflecting genuine commercial activity could, in principle, fall within the scope of Article 12(5) without artificiality being a formal prerequisite for the provision to apply. Snowden LJ described artificiality as "highly relevant" rather than as a threshold requirement, a formulation that preserves the relevance of commercial coherence and economic reality within the analysis without making them determinative on their own.
The specific wording of Article 12(5) examined in Burlington has since been displaced for current arrangements by the Principal Purpose Test introduced through the Multilateral Instrument, and that shift raises a direct question about how much of the Court's reasoning carries forward into a treaty landscape now governed by different language. The wording of the provisions differs and any mechanical comparison requires caution, but the underlying concerns the Court was addressing are not confined to the former Article 12(5) wording. Professional commentary following Burlington has suggested that the practical distance between the former anti-abuse provision and the modern PPT may, in some contexts, prove narrower than the difference in language initially implies, and for practitioners advising on structures governed by the PPT, that observation deserves to be taken seriously rather than noted and set aside. The PPT asks whether obtaining the treaty benefit was one of the principal purposes of the arrangement, and Burlington's analysis of what separates genuine commercial purpose from treaty abuse is directly relevant to how that question is approached, even where the specific provision under examination is different.
Burlington establishes that a commercially genuine transaction does not become treaty abuse because the taxpayer understood and anticipated the treaty benefit it would produce. For UK-Ireland groups whose financing arrangements, holding structures and investment decisions were designed with treaty outcomes in mind, including withholding tax exemptions on interest and dividends, participation exemption planning and wider treaty access, that is a significant judicial statement about the relationship between commercial reality and treaty purpose.
The reasoning the Court applied is unlikely to remain confined to the distressed debt context from which it emerged. The Court anchored its analysis to the transaction as it actually existed, examining the circumstances in which the debt was acquired, the relationship between the parties and the commercial setting in which decisions were made, rather than reconstructing a hypothetical version of events designed to produce a different tax result. That approach carries implications for how UK-Ireland arrangements are examined where treaty outcomes have influenced commercial behaviour without dictating it, because the commercially genuine character of the arrangement, evidenced through the circumstances of its implementation rather than through its tax outcome, was the feature that distinguished Burlington's position from the abuse the provision was designed to address.
The question of how far that reasoning carries into disputes governed by the Principal Purpose Test rather than the former Article 12(5) wording remains genuinely open, and the difference in language means that Burlington cannot be read as resolving it. What the judgment does establish, with clarity and unanimity across the Court of Appeal, is that the commercial reality of an arrangement is not displaced by the taxpayer's awareness of its treaty consequences, and that a court examining purpose will look at what actually happened and why rather than constructing an alternative transaction designed to neutralise the benefit. For UK-Ireland groups operating structures where treaty outcomes are part of the commercial rationale rather than incidental to it, that principle is the most practically significant thing Burlington has to say.