The Portugal NHR Constitutional Court ruling published as Acórdão n.º 366/2026 strikes down two specific segments of the statutory and regulatory architecture supporting the 20% special rate for non-habitual residents on category B income earned in “high-value-added activities”. The decision does not, in itself, end the regime for current beneficiaries; it does, however, materially alter the litigation risk profile for one defined group of taxpayers and raises a more general question over the constitutional resilience of the regime’s design and of the regime that succeeded it.
The ruling is in concrete review, not abstract review. It binds the specific case and does not carry general binding effect. Past assessments are not automatically reopened, and the position is one of casuistic risk dependent on the procedural status of individual matters rather than of automatic loss of benefits already received. The substantive reasoning, however, is broad enough to be deployed across the wider table of qualifying activities and, by extension, against parts of the IFICI architecture that mirrors the NHR design.
What the Portugal NHR Constitutional Court ruling decided
The dispositive is narrow. The First Section of the Constitutional Court, in obligatory appeal from a CAAD arbitral decision in Proceedings 732/2024-T, ruled on 21 April 2026 (relator Conselheiro João Carlos Loureiro) that:
- Article 72.º n.º 10 CIRS, in the wording of Law 3/2019 of 9 January, is unconstitutional in the segment where it delegates to administrative regulation the primary definition of the high-value-added activities of a scientific, artistic or technical character producing category B income subject, when received by non-habitual residents, to the special 20% rate, for breach of Articles 103.º n.º 2 and 112.º n.º 5 of the Constitution.
- Point I of the Annex to Portaria n.º 12/2010 of 7 January, in the wording of Portaria n.º 230/2019 of 23 July, is unconstitutional in the segment qualifying “directors of administrative and commercial services” (CPP code 12) as a high-value-added activity of scientific, artistic or technical character, for breach of Articles 103.º n.º 2 and 165.º n.º 1 al. i) of the Constitution.
The ruling rests on two converging propositions. First, the statute did not delegate technical implementation of legislatively defined criteria but rather entrusted the executive with primary and innovatory definition of the substantive scope of the benefit, in breach of the prohibition on the deslegalisation of matters within the parliamentary legislative reserve. Second, tax benefits, although extrafiscal in their economic purpose, form part of the “constituição fiscal” and require parliamentary densification, which the open-ended formula “high-value-added activities of scientific, artistic or technical character” does not provide. The Court characterised the concept as not merely indeterminate but indeterminable: the statute does not allow the universe of eligible activities to be circumscribed in advance by interpretation, and it is not concretised by reference to any other piece of legislation or by consolidated case law.
The Court also drew on a comparative excursus (Denmark, France, Italy) to show that, in jurisdictions operating analogous attractiveness regimes, the legislative perimeter of beneficiaries and qualifying activities is defined either by direct statutory enumeration or by reference to other statutorily defined regimes, not by open delegation to administrative regulation.
Procedural posture and its limits
The decision is rendered in concrete review under Article 280.º of the Constitution. It binds the parties to the specific proceedings and does not carry general binding force. The retroactive-effects regime and the discretion to modulate effects in Article 282.º of the Constitution are reserved for decisions issued in abstract review under Article 281.º. Under Article 281.º n.º 3, three concurrent concrete decisions on the same normative dimension trigger the procedure capable of producing an abstract declaration of unconstitutionality with general binding effect. Acórdão 366/2026 is therefore the first formal step on a path that, if repeated, could yield a generalised solution; it is not, on its own, that solution.
The Court was also careful to limit its holding to category B income, because category B was the only category in issue in the underlying case. Category A income (employment income) earned by NHR holders in qualifying activities is not covered by this ruling on its terms, although the Court’s underlying reasoning would, in principle, apply to it as well.
The regime’s survival under the transitional clauses
Article 72.º n.º 10 CIRS was formally repealed by Law 82/2023 of 29 December (the 2024 State Budget Law), which replaced the NHR with the IFICI regime introduced as Article 58.º-A of the Tax Benefits Statute. Article 236.º n.º 3 of the same law nevertheless maintains the previous wording of Article 72.º n.os 10 and 12 CIRS in force for taxpayers who already held NHR status at the date of the law’s entry into force, and, on the conditions established in Article 236.º n.os 2 and 3, for taxpayers who registered as residents within the transitional window. The regime continues to produce effects until the last 10-year NHR period expires.
The Constitutional Court’s ruling therefore operates against a backdrop where the impugned statutory provision is no longer being newly applied but continues, on transitional terms, to govern a defined and identifiable population of current beneficiaries.
Risk profile by category of NHR holder
The decision does not, of itself, reopen prior liquidations or trigger automatic correction of past assessments. There is no general binding declaration and no Article 282.º effects modulation. Within periods still inside the standard four-year caducidade limit of Article 45.º of the LGT, and in matters currently before the courts or arbitral tribunals or under inspection, however, both the tax administration and the courts (judicial or arbitral) may, under Article 204.º of the Constitution, refuse to apply the same normative segments by direct access to the Constitution, as the CAAD did in the proceedings underlying this ruling.
Three concentric circles of risk follow:
- The first circle covers taxpayers whose category B income was characterised under CPP code 12, “directors of administrative and commercial services”. This group is now the most directly exposed. The specific Portaria segment that supported their qualification has been formally declared unconstitutional. In any inspection, reclamação graciosa or pending dispute, that ruling will be invoked.
- The second circle covers taxpayers whose category B income was characterised under any other line of the Portaria 12/2010 table. The Court’s dispositive did not extend to those other lines, but the reasoning treats the entire table as innovatory and as therefore violating the legislative reserve. The line of attack is structurally identical; only the procedural status differs. Extension to other professional codes will require further concrete decisions or, eventually, the abstract review path of Article 281.º n.º 3 of the Constitution.
- The third circle covers taxpayers receiving category A income under the special rate. They fall outside the scope of the ruling on its terms because category A was not in issue. As a matter of constitutional architecture, the same reasoning would apply; as a matter of current operative law, the holding does not reach them.
The litigation dynamic is not symmetrical. The administration has every incentive to invoke unconstitutionality where it operates to refuse the benefit; the taxpayer does not, because invoking it loses the 20% rate. The asymmetry shifts the practical risk onto the beneficiary in any matter in which the administration’s posture has changed.
The IFICI mirror
The IFICI regime, set out in Article 58.º-A of the Tax Benefits Statute and introduced as the NHR successor by Law 82/2023, is more densely defined at statute level than its predecessor. Article 58.º-A identifies several blocks of qualifying activities, several of which are anchored to pre-existing statutory regimes: university teaching and research within entities of the National Scientific and Technological System; qualified posts attached to contractual investment benefits under the Investment Tax Code (Decree-Law 162/2014); research and development eligible under the SIFIDE; qualified posts in certified startups under Law 21/2023; and qualified posts in entities established in the Autonomous Regions of the Azores and of Madeira. To that extent, the legislative architecture is closer to the level of densification that the Constitutional Court treats as adequate.
Two structural points nevertheless replicate the design fragility identified in Acórdão 366/2026.
First, Article 58.º-A n.º 1 delegates the definition of “highly qualified professions” in qualifying companies to ministerial regulation, and the selection of “economic activities relevant to the national economy, namely for the attraction of productive investment and the reduction of regional asymmetries” to notices issued by AICEP and IAPMEI. The statutory criteria at this level (“companies with RFAI applications”, “exporting industrial or service companies”, “strategic importance”, “reduction of regional asymmetries”) may or may not be sufficiently dense in light of the Court’s ratio. The question is open and is, on the reasoning of Acórdão 366/2026, the point of most exposure.
Second, Article 58.º-A n.º 8 maintains, transitionally and pending full operationalisation of the IFICI-specific regulatory framework, an express reference to the activities listed in Portaria 12/2010 and to the CAE codes of Portaria 282/2014. For 2024 income, the qualifying perimeter of “highly qualified professions” was, by legislative choice, the same table whose innovatory and inconstitutional character has now been recognised in the NHR context. The contamination is direct.
Acórdão 366/2026 does not pronounce on the IFICI, and the IFICI regime remains fully in force. The ruling does, however, provide a coherent argumentative framework that may be deployed against parts of the IFICI’s regulatory architecture, particularly the constitutionality of the open delegations to ministerial regulation and to AICEP and IAPMEI notices, and the transitional importation of the Portaria 12/2010 table for 2024 IFICI applications. The risk for prospective IFICI applicants is therefore not whether the regime continues to exist, but whether specific line items of the implementing portaria and notices will survive, as primary sources of beneficiary delimitation, a challenge that mirrors the reasoning of Acórdão 366/2026.
Practical considerations for current NHR holders
For taxpayers within the transitional NHR window, four operational steps follow from the decision.
- Portfolio mapping. Identify, within the current NHR client base, those receiving category B income and the specific Portaria 12/2010 line under which that income is characterised. CPP code 12 cases are the primary risk; other lines carry secondary exposure under the same reasoning, although the dispositive has not yet reached them.
- Caducidade analysis. Identify the years still open under Article 45.º of the LGT, taking account of the relevant suspensions and interruptions. The ruling cannot reopen periods already covered by definitive assessments, but it can be invoked in respect of any year still within reach.
- Pending matters. Where an inspection is open, a reclamação graciosa is pending, or arbitral or judicial proceedings are under way, the procedural strategy in light of Acórdão 366/2026 should be reviewed. The administration may seek to deploy the ruling against the benefit; the taxpayer’s procedural position will depend on the specific facts of the matter, including the category of income, the activity characterisation, and the procedural posture.
- IFICI eligibility review. Where migration to the IFICI regime is being contemplated within the windows allowed by Portaria 352/2024 (as amended by Portaria 52-A/2025), the substantive eligibility analysis should now also flag the residual constitutional fragility in the open delegations within Article 58.º-A n.º 1 and in the transitional reference of Article 58.º-A n.º 8 to Portaria 12/2010. The risk is materially lower than under the now-impugned NHR architecture, but it is not zero.
Key Takeway
The Portugal NHR Constitutional Court ruling does not, in itself, dismantle the regime as it operates for current beneficiaries, but it materially changes the litigation calculus for one defined group, opens a structural line of attack on the wider Portaria 12/2010 table, and provides argumentative material that may be deployed against parts of the IFICI architecture. The position is one of casuistic risk dependent on the procedural status of individual matters, not of automatic loss of benefits already received.
MCS can assist with NHR portfolio review, caducidade mapping, inspection and litigation strategy, and IFICI substantive eligibility analysis on a case-by-case basis, subject to confirmation of facts and engagement scope.
This article reflects MCS’s general technical understanding of the matters discussed as at the date of publication. It is provided for informational purposes only and does not constitute legal, tax, accounting, financial or other professional advice, nor does it create an advisory relationship with the reader. Tax law and administrative practice evolve rapidly; the application of any rule, ruling or regime to a specific situation depends on the relevant facts and may differ from the general description provided here. MCS can assist with case-by-case analysis on engagement, subject to confirmation of facts and scope. For specific guidance, please contact us.
Miguel Pinto-Correia holds a Master Degree in International Economics and European Studies from ISEG – Lisbon School of Economics & Management and a Bachelor Degree in Economics from Nova School of Business and Economics. He is a permanent member of the Order of the Economists (Ordem dos Economistas)… Read more
