What Acórdão 409/2026 Actually Ruled
On 8 May 2026 the Tribunal Constitucional, sitting in plenário, ruled unanimously that the core provisions of Decreto n.º 49/XVII — the Penal Code amendment passed by Parliament on 1 April 2026 that would have introduced loss of Portuguese nationality as an accessory criminal penalty — are unconstitutional. The ruling, Acórdão 409/2026, was the second consecutive unanimous Constitutional Court rejection of the same statutory project, following the December 2025 ruling that struck down the first version. As ECO reported on 12 May 2026, the Constitutional Court found the loss-of-nationality provisions failed both the equality test (because they applied only to citizens holding another nationality) and the proportionality test (because the collateral consequences exceeded any legitimate penal aim).
The institutional posture matters. The Constitutional Court declared the central provisions unconstitutional in a preventive review — meaning the assessment was conducted before the law entered into force, at the request of the President of the Republic. A preventive ruling that finds provisions unconstitutional has a specific legal consequence: the President cannot promulgate the decree as drafted. The decree returns to Parliament, which must either redraft to cure the constitutional defects or attempt a confirmatory re-passage with a supermajority. The May 2026 ruling left Parliament with a narrow path on this specific question, and the political reality is that the second consecutive unanimous chumbo signalled to the legislative supporters that the underlying idea — citizenship-stripping as a criminal accessory — cannot be saved without abandoning the dual-citizen targeting that made it politically viable in the first place.
For wealthy expats following Portuguese citizenship developments, Acórdão 409/2026 is the load-bearing ruling. The 10-year residency requirement under Lei Orgânica 1/2026, the civics test, the integration commitment — those are now live law as of 19 May 2026 and are the prospective rules anyone naturalising in the future must satisfy. But the Penal Code revocation regime, which would have created a retrospective risk for anyone holding Portuguese citizenship plus another nationality, is now constitutionally blocked. The two storylines are often conflated in expat-facing news coverage. They are distinct, and the second is the one most relevant to the cohort that already completed the citizenship pathway or is in the late stages of doing so.
Decreto 49/XVII: What Parliament Tried to Pass
Decreto 49/XVII was the parliamentary product of an October 2025 legislative package that paired the residency-extension Nationality Law (eventually published as Lei Orgânica 1/2026) with a Penal Code amendment introducing a new Article 69-D. The Article 69-D structure made loss of Portuguese nationality available as an accessory penalty in criminal sentencing, applicable to defendants who held Portuguese citizenship and at least one other nationality, where the predicate offence carried a sentence of five years or more in prison. The qualifying offences were a list that included terrorism, organised crime, serious drug trafficking, and certain crimes against state security. The structure was modelled on similar provisions in French, Belgian, and Danish law, with the explicit political framing — articulated by the parliamentary majority that passed it — that loss of nationality should be a sanction available for the most serious criminal cases involving dual nationals.
The constitutional difficulty was built into the basic structure. By limiting the penalty to citizens who held another nationality, the Decreto created a class distinction between citizens who could face citizenship-loss as a criminal consequence and citizens who could not. The mechanism preserving non-statelessness — the Constitution's Article 26 protection against rendering a person stateless — required the targeting to be limited to people with an alternative nationality, but that very targeting was what made the equality challenge inevitable. The political answer was that the dual-national category is a meaningful distinguishing characteristic that justifies differential treatment. The constitutional answer, articulated unanimously by the Tribunal Constitucional in both December 2025 and again in May 2026, was that the distinction violates the Article 13 equality guarantee and cannot be cured by adjusting the threshold sentence or the list of qualifying offences.
A naturalised American citizen who also holds Portuguese citizenship — the modal reader of this blog — would have been a member of the class targeted by Article 69-D had the provision entered into force. The provision would have created a risk asymmetry between that reader and a native-born Portuguese citizen with no other nationality, even if both committed the same predicate offence. The ruling in Acórdão 409/2026 closes that asymmetry. The political will to reopen it survives, but the constitutional pathway available to Parliament is now narrow enough that the practical risk over a one-to-five-year horizon is low.
The Equality Test: Two Classes of Citizens
The equality analysis in Acórdão 409/2026 is the first of the two constitutional grounds and the more consequential for future legislative attempts. Article 13 of the Constitution requires that all citizens be equal before the law, with prohibited discrimination expressly extending to ancestry, sex, race, language, territory of origin, religion, political or ideological convictions, instruction, economic situation, social condition, and sexual orientation. The Constitutional Court has consistently read Article 13 as also prohibiting differential treatment of citizens based on the manner of citizenship acquisition — naturalised versus born — absent a compelling justification that survives strict scrutiny.
The legislator's argument in defending Decreto 49/XVII was that the discrimination was not between native-born and naturalised citizens as such, but between citizens with one nationality and citizens with two. This framing attempts to side-step the Article 13 challenge by anchoring the distinction in the legal-status fact of dual nationality rather than in the historical fact of how Portuguese citizenship was acquired. The Tribunal Constitucional rejected the framing on multiple grounds, but the operationally decisive one was that the dual-nationality cohort overlaps substantially with the naturalised cohort. The overwhelming majority of Portuguese citizens who hold another nationality acquired Portuguese citizenship through naturalisation rather than being born with two passports. The class targeted by Article 69-D was, in practical demographic reality, the naturalised-citizen class.
The implication for future drafting is significant. A revised Penal Code amendment that purports to apply equally to native-born and naturalised dual nationals would either need to disregard the Article 26 statelessness protection (which is constitutionally entrenched) or accept that the equality reasoning of Acórdão 409/2026 will defeat any narrowly tailored version. The political coalition that supported Decreto 49/XVII could attempt a confirmatory re-passage with a two-thirds majority, but the Constitutional Court's December 2025 and May 2026 rulings together create a doctrine that any constitutional review of a re-passed version would reach the same conclusion. The path is open as a procedural matter and effectively closed as a substantive matter.
The Proportionality Test: Statelessness and EU Mobility
The second constitutional ground is proportionality. The Court analysed the consequences of citizenship loss under Article 69-D and found them to extend far beyond the criminal-sentencing context the provision purported to occupy. Loss of Portuguese citizenship eliminates the citizen's right to reside in Portugal as a Portuguese national, eliminates EU citizenship and the Schengen-area free-movement rights attached to it, eliminates the right to political participation, and creates a substantial risk of statelessness if the other nationality is also lost through the operation of the other state's law. Global Law Experts notes: "Nationality is a foundational legal status, and its removal carries consequences far beyond the criminal justice sphere, affecting residency rights, family life, access to social services, freedom of movement within the EU, and political participation. The severity of these collateral effects exceeded what could be justified by any penal objective."
The doctrinal point in the proportionality analysis is that an accessory criminal penalty must bear a proportionate relationship to the predicate offence. Imprisonment, fines, and certain civil-rights restrictions are conventional accessory penalties whose effects are commensurate with the underlying crime. Citizenship loss is qualitatively different because its effects are categorical, permanent, and extend to consequences that the criminal-sentencing court is not equipped to evaluate. A criminal trial focused on a terrorism or organised-crime charge cannot in any meaningful sense adjudicate whether the defendant should retain the right to live and work in the Schengen area, the right to vote in Portuguese elections, or the right to family life on Portuguese territory. The Constitutional Court found that the categorical effects of citizenship loss exceeded the doctrinal limits of accessory criminal sanctions.
For dual nationals from non-EU countries — Americans, British post-Brexit, Canadians, Australians — the EU mobility consequence is the most significant single effect. Loss of Portuguese citizenship would mean loss of the right to enter the Schengen area visa-free under the EU citizenship pathway, loss of the right to live and work in any of the other 26 EU states without an immigration permit, and loss of any onward citizenship pathway through accumulated EU residence. The Constitutional Court treated these consequences as constitutionally cognisable in the proportionality analysis, which is itself a substantive doctrinal development — earlier loss-of-nationality jurisprudence in other European jurisdictions has tended to treat the EU-mobility consequences as outside the constitutional analysis of the underlying national measure. Acórdão 409/2026 brings them inside.
Where the Decree Is Now: Seguro's Return to Parliament May 12
On 12 May 2026, four days after the Constitutional Court ruling was published, President António José Seguro formally returned Decreto 49/XVII to the Assembleia da República. The mechanism for return is the procedural step that follows a preventive constitutional ruling of unconstitutionality: the President cannot promulgate the decree, and the constitutional rule requires that the text be sent back to Parliament for either redrafting or confirmation. Público reported the return the same day, noting that the procedural decision was the only one the constitutional framework permitted given the unanimous Tribunal Constitucional ruling.
What Parliament does next is the open question. The October 2025 legislative majority that passed the original version, plus the April 2026 majority that passed the revised version after the first chumbo, remains broadly intact. The political instinct to attempt a third version exists. The constitutional reality is that a third version that retains the dual-nationality targeting will face the same equality challenge, and a third version that abandons dual-nationality targeting would either need to risk statelessness (which Article 26 forbids) or apply equally to all Portuguese citizens regardless of dual-national status (which is politically a non-starter because it would expose native-born Portuguese citizens to the same penalty and was never the intent of the project). The pathway to a constitutionally viable third version is genuinely narrow.
The most likely scenarios over the next twelve months are: a quiet deferral of the project pending a different political moment; a narrowly tailored redraft addressing only specific categories (for instance, naturalised citizens who acquired Portuguese citizenship through fraudulent representation, which is a different constitutional question and is already partially addressed in the existing nationality framework); or a confirmatory re-passage with the implicit political acknowledgment that the law will not survive subsequent constitutional review. From a practical risk-assessment standpoint for the wealthy-expat cohort that holds or is seeking Portuguese citizenship, the operational consequence is that the loss-of-nationality regime under Article 69-D is not in force and is unlikely to be in force within the planning horizon that matters to a typical residency-investment or family-relocation decision.
Practical Effect for Naturalised Americans, Brits, Canadians
The cohort most directly affected by Acórdão 409/2026 is the population of wealthy dual nationals who have completed the Portuguese citizenship pathway and now hold both a Portuguese passport and their original nationality — Americans, British, Canadians, Australians, and other non-EU dual nationals. For this cohort the ruling is a constitutional anchor that the equal-treatment guarantee in Article 13 protects against the Penal Code revocation regime that Parliament has now twice failed to enact. The practical operational guidance is: nothing in your immigration or citizenship file changes. The Portuguese passport you hold remains valid and confers the full set of rights it conferred before April 2026.
For the cohort still on the citizenship pathway — Golden Visa investors approaching the residency-time threshold, D7 holders mid-cycle, family-reunification applicants with several years still to run — the ruling is also a stabilising factor. The 10-year residency requirement under Lei Orgânica 1/2026 is the binding new constraint on acquisition, but the Acórdão 409/2026 ruling means that the citizenship you eventually acquire will be the same status as native-born Portuguese citizenship, not a sub-class protected against revocation only by ordinary criminal-law procedural safeguards. The two-tier citizenship model that Decreto 49/XVII would have created is now constitutionally foreclosed. Our piece on the promulgated text walks through the acquisition rules; this piece supplies the missing post-acquisition stability frame.
The risk that does remain is political rather than legal. Parliament's repeated attempts to enact citizenship-stripping signal that the political coalition supporting the measure is durable, and the constitutional argument that defeats it could be revised by a future Tribunal Constitucional with different composition or by a constitutional amendment under the supermajority procedure for fundamental rights. Both pathways are slow and uncertain. The strategic implication for a wealthy expat making a five-to-ten year horizon decision about Portuguese citizenship is that the equal-treatment guarantee is currently the constitutional doctrine and is likely to remain so through the planning horizon, but should not be treated as immutable across all decision horizons. Our piece on the Golden Visa constitutional challenge covers the parallel litigation track relevant to investors already in-process.