June 5, 2025 — The European Commission's investigation of national tax rulings as potential state aid is one of the more unusual instruments of European tax policy. The state aid framework, set out in Articles 107 and 108 of the Treaty on the Functioning of the European Union, prohibits Member States from granting selective advantages to specific undertakings that distort competition in the internal market. The Commission has, since 2014, applied this framework to national tax rulings that it considers to have provided selective advantages to specific multinational groups.

The framework's application to tax rulings has been controversial. Tax rulings are a normal feature of the relationship between national tax administrations and taxpayers, providing certainty on the application of the tax law to specific factual situations. The Commission's position has been that some tax rulings have gone beyond the proper application of the law and have provided advantages that selective Member States granted to specific multinationals, in violation of the state aid prohibition.

By 2025, the framework has produced several major decisions and is now an established component of the European Commission's tax policy toolkit. This article reads where the framework stands and what its continuing influence has been.

The conceptual framework

The state aid framework requires four elements for a finding of unlawful state aid: an advantage granted by a Member State; the advantage being financed by state resources; the advantage being selective in favour of specific undertakings; and the advantage having an effect on competition and trade between Member States. Tax rulings can constitute state aid where they provide selective advantages that go beyond the proper application of the tax law.

The selectivity element has been the principal point of contention. The Commission's position has been that a tax ruling provides selectivity where it produces a tax outcome more favourable than the outcome that would result from the proper application of the relevant tax law. The selectivity is established by reference to a benchmark of how the tax law would apply to comparable taxpayers without the ruling.

The challenge of establishing the benchmark has been the principal source of dispute. Member States have argued that the Commission has, in some cases, constructed the benchmark in ways that do not accurately reflect the application of the relevant national tax law. The Court of Justice of the European Union has been asked to resolve these disputes in several cases, with mixed outcomes.

The major decisions

The Commission's decisions have produced several high-profile cases that have shaped the framework's application.

The Apple Ireland case, decided by the Commission in 2016 and ultimately resolved by the Court of Justice in 2024, involved tax rulings issued by the Irish tax authorities to Apple subsidiaries. The Commission found that the rulings provided selective advantages amounting to approximately 13 billion euros in unpaid tax over the period covered by the rulings. The case was litigated through the General Court, which annulled the Commission's decision in 2020, and to the Court of Justice, which in September 2024 upheld the Commission's original decision and reinstated the recovery order. The decision was the most significant outcome of the framework's application and produced material implications for tax ruling practice across the European Union.

The Starbucks Netherlands case, decided by the Commission in 2015, involved tax rulings issued by the Dutch tax authorities. The case was litigated through the General Court and produced an outcome favourable to the taxpayer, with the General Court annulling the Commission's decision on the basis that the Commission had not adequately demonstrated selectivity.

The Fiat Luxembourg case, decided by the Commission in 2015 and ultimately resolved at the Court of Justice level in 2022, involved a tax ruling on transfer pricing methodology. The Court of Justice in November 2022 annulled the Commission's decision on grounds of inadequate selectivity demonstration.

The Amazon Luxembourg case, decided by the Commission in 2017, was annulled by the General Court in 2021 and the annulment was upheld by the Court of Justice in 2023. The case produced jurisprudence on the appropriate methodology for analysing transfer pricing rulings under the state aid framework.

The cumulative effect of the cases has been a body of jurisprudence that constrains the Commission's ability to find state aid in tax rulings without rigorous demonstration of selectivity. The Apple decision in 2024 indicated that the framework remains operational where the demonstration is adequate, while the Fiat and Amazon decisions indicated that inadequate demonstrations will not survive judicial review.

The implications for tax ruling practice

The framework has produced significant changes in tax ruling practice across the European Union. The principal implications are described below.

The first implication has been increased caution by national tax administrations in issuing rulings that could be characterised as providing selective advantages. The Irish, Luxembourg, Dutch, and Belgian administrations have, in the post-2014 period, refined their ruling procedures to ensure that rulings reflect the proper application of national law rather than producing outcomes that diverge from it.

The second implication has been a reduction in the willingness of multinationals to rely on national tax rulings for significant structuring positions. The risk that a ruling could subsequently be challenged as state aid, with potential recovery extending back ten or more years, has reduced the value of rulings as a planning tool. Multinationals have, in some cases, structured their positions to operate within the clearly correct application of the tax law rather than seeking rulings that would produce more favourable outcomes.

The third implication has been the harmonisation of European tax ruling practice. The Commission's framework has produced pressure on national administrations to converge on similar approaches to ruling, with the consequence that the differentiation among Member States in ruling practice has narrowed. The remaining variation operates principally at the level of administrative practice rather than at the level of substantive outcome.

The link to broader EU tax policy

The state aid framework operates alongside other instruments of European tax policy, including the Anti-Tax Avoidance Directives, the Code of Conduct on Business Taxation, and the post-Pillar Two implementation framework. The instruments are conceptually distinct but operate on overlapping subject matter.

The state aid framework is unique in that it is the only instrument that produces direct recovery of unpaid tax from specific multinationals through enforceable Commission decisions. The other instruments operate principally through Member State implementation and produce changes in domestic law rather than direct recovery. The state aid framework's enforcement teeth have made it a particularly significant instrument despite its narrower scope.

The relationship with Pillar Two is worth noting. Pillar Two's 15 percent effective rate floor will, in many cases, produce outcomes that align with what the state aid framework was attempting to achieve in its tax ruling cases. A multinational that previously obtained a low-tax outcome through a Member State ruling will, post-Pillar Two, face a 15 percent floor that operates regardless of the ruling's terms. The two instruments are complementary in this respect, with Pillar Two operating prospectively and the state aid framework operating retrospectively.

The criticisms of the framework

The Commission's application of the state aid framework to tax rulings has attracted significant criticism. The principal criticisms have been described below.

The first criticism is that the Commission has applied the framework as a substitute for tax policy rather than as a competition policy instrument. The argument is that the Commission has used state aid as a means of disciplining Member States' tax systems where direct tax harmonisation would require unanimous Council approval that has not been forthcoming. The criticism is at least partially substantiated by the political context in which the framework has been applied.

The second criticism is that the framework has produced uncertainty for multinational tax planning. A multinational that has obtained a national tax ruling in good faith, that has relied on the ruling for many years, and that subsequently faces a state aid recovery action faces a substantial retroactive adjustment that the original ruling did not anticipate. The retroactivity is inherent in the framework's design but produces practical concerns for affected multinationals.

The third criticism is that the framework has been applied selectively, with some Member States and some multinationals being subject to more intensive scrutiny than others. The Commission has rejected this criticism, but the perception of selective application has affected the political support for the framework.

The defence of the framework

The defence of the framework, articulated by the Commission and by some commentators, rests on several propositions. The first is that the framework is a legitimate application of state aid principles to tax measures, with the application following from the textual scope of Articles 107 and 108 TFEU. The second is that the framework has produced beneficial outcomes by reducing the use of selective tax advantages and by promoting fair competition in the internal market. The third is that the framework's application has been consistent with the legal principles, with the cases decided in favour of the Commission demonstrating the framework's substantive merit.

The Court of Justice's 2024 decision in Apple Ireland reinforced the framework's legitimacy by upholding the Commission's most prominent case. The decision indicated that, while inadequate demonstrations of selectivity will not survive judicial review, the framework itself is a valid application of state aid principles to tax measures.

The trajectory through the second half of the 2020s

The trajectory of the state aid framework through the second half of the 2020s is uncertain in some respects but reasonably clear in others. The framework will continue to operate, with the Commission likely to bring additional cases where it identifies tax rulings that it considers selective. The cases are likely to be more carefully framed than some of the early cases, reflecting the lessons of the litigation experience.

The interaction with Pillar Two will continue to develop. As Pillar Two's 15 percent floor produces outcomes that align with what state aid challenges sought to achieve, the marginal value of new state aid cases for prospective situations will decline. The framework may shift toward retrospective recovery from pre-Pillar Two periods rather than continuing to address current ruling practice.

For multinationals operating in Europe, the framework will remain a feature of the tax policy landscape that must be considered in structuring decisions. The operational implication is that significant structuring positions cannot rely on national tax rulings as definitive without consideration of the residual state aid risk. The framework has, in this sense, established itself as a permanent component of European tax compliance, with continuing influence on how multinationals approach their European positions.