Which convictions block Portuguese citizenship

The short answer, which almost every English-language forum still gets wrong: no, a criminal record does not by itself block a Portuguese naturalisation application. Since 19 May 2026 the bar is a conviction that is final (no appeal left), carries an effective prison sentence of more than three years, and was handed down for one of a closed list of offences. Below that threshold, or outside that list, a conviction is not a legal impediment to applying.

The confusion has a specific source. Before the Lei Orgânica 1/2026 of 18 May, the test was different and much wider: it was enough that the offence was punishable by a maximum sentence of three years or more — the abstract statutory range, not the sentence you actually received. Anything written before May 2026, including a great deal of law-firm content that has not been updated, is answering the old question. If the 2026 reform is new to you, start with the guide to the new nationality law and its deadlines; this page covers only the criminal part.

What the closed list actually says

The requirement sits in article 6(1)(f) of the Nationality Law (Lei 37/81, consolidated text). Naturalisation requires that applicants have not been convicted, by a final judicial decision, to an effective prison sentence of more than 3 years for offences of terrorism, violent and especially violent crime, highly organised crime, offences against State security, or aiding illegal immigration, punishable under Portuguese law.

Notice what is missing. Not driving offences, not theft, not fraud, not tax offences, not drug offences as such. Five categories, each defined elsewhere in Portuguese law — «violent», «especially violent» and «highly organised» crime are terms of art from the Code of Criminal Procedure, not everyday adjectives. An offence outside those categories does not engage this requirement however heavy the sentence was.

Two neighbouring provisions get mistaken for it. One requires that the applicant not represent a danger or threat to national security or defence, and another excludes people subject to UN or EU restrictive measures. Neither needs a conviction at all: they run on intelligence, not on sentences.

Three phrases worth reading slowly

«Final» (trânsito em julgado) means no appeal remains available. An open investigation, a pending charge, a first-instance conviction still under appeal — none of those is a final conviction, and none of them engages the provision.

«More than three years» is more than, not «three years or more». A sentence of exactly three years falls outside the wording. The previous version said «equal to or greater than»; the change was deliberate.

«Effective» is the load-bearing word. In Portuguese criminal law a prison sentence can be imposed and then suspended in its execution; pena de prisão efetiva is the phrase that distinguishes prison actually served from a suspended sentence. The legislator chose that word rather than plain «prison sentence». What does not exist yet is any published guidance on how the central registry treats the borderline cases — a suspended sentence later revoked, for instance. We are not going to invent an answer we cannot source.

If your conviction is not on that list

Then a different provision applies. Opposition by the public prosecutor — the mechanism that can undo nationality acquired by declaration, through marriage or a civil partnership — used to have its own standalone conviction ground. It no longer does: the paragraph that provided it is now expressly repealed.

What replaced it is subtler. The neighbouring paragraph still allows opposition for the absence of an effective link to the national community, and it now says that link is assessed using the material parameters of points (c) to (i) — the same ones used for naturalisation, plus one more — including consideration of a conviction for desecration of the national symbols. A conviction is no longer a ground in itself; it is one input into a broader judgement — with one offence singled out by name.

Married to a Portuguese citizen? This changed in 2026

Acquisition by marriage or civil partnership gained a new paragraph 4 in 2026: it now depends on none of the same criminal-record situations used for naturalisation being present. That is an architectural change rather than a detail. The criminal filter used to arrive only afterwards, if a prosecutor chose to oppose; it is now a front-loaded requirement, as it is for every other route.

There is a second, quieter consequence. The following paragraph removes the possibility of opposition where the marriage or partnership is more than six years old, or where the couple has common children with Portuguese nationality — except on the same criminal grounds. The six-year protection many people rely on does not cover the criminal limb.

How the registry finds out

Not from what you write on the form. Under a provision of the Nationality Regulation — Decreto-Lei 237-A/2006, republished in full as an annex to Decreto-Lei 26/2022 — once a file survives summary rejection, the Conservatória dos Registos Centrais requests the necessary information from the judicial police and the immigration authority. Those bodies have 30 days to answer, extendable to 60, and must update what they said whenever it changes. This is a large part of why files sit for months after being handed in: for a stretch of that time they are not on anyone's desk at the registry.

One institutional point, because it is the single most common mistake in English-language advice: nationality is decided by the Instituto dos Registos e do Notariado and the Ministry of Justice — not by AIMA, which handles residence permits. Which police certificates you must file, and from which countries, is covered in the document checklist.

Can a conviction take away nationality you already hold?

If your nationality is originária — held from birth — no. The Nationality Law has exactly one article on loss, article 8, and what it provides for is loss by the person's own choice: those who, being nationals of another State, declare that they do not wish to be Portuguese. There is no criminal route to deprivation anywhere in that chapter. Article 26(4) of the Constitution constrains the legislator itself: deprivation of citizenship may occur only in the cases and terms provided by law, and may never be based on political grounds.

There is one narrow window, and only for nationality acquired by declaration: prosecutorial opposition, which under article 10(1) must be lodged within two years of the date the acquisition was registered. After two years that door closes. It never existed for nationality held from birth.