Citizenship by marriage or civil partnership
Derivative acquisition through marriage or civil partnership with a Portuguese citizen of more than three years.
Portuguese citizenship may be acquired — derivative modality — by the spouse or civil partner of a Portuguese citizen, by declaration of will while the marriage or civil partnership has subsisted for more than three years. The applicable framework is article 3 of Law 37/81. It is a route technically more direct than naturalisation by residency, but it requires rigorous documentary preparation and careful management of the risk of opposition.
What citizenship by marriage or civil partnership is
The derivative modality means that the applicant acquires citizenship at a particular moment — they are not Portuguese from birth, unlike the original modality (descent). The law sets out three central points:
- Existence and duration of the relationship — marriage or civil partnership subsisting for more than three years, as at the date of the application;
- Declaration of will — the applicant expressly declares that they wish to acquire Portuguese citizenship;
- No opposition from the Public Prosecutor — the application is submitted to the Public Prosecutor for review, who may oppose on the basis of relevant facts (article 9).
Where these elements are met, the Central Registry Office may grant citizenship to the spouse or civil partner, with the publication of the birth record entry.
Marriage, civil partnership and documentary evidence
There are practically relevant differences between the two routes:
Marriage. The act is formally recorded — proof is by the marriage certificate. Where it has been performed abroad between a Portuguese national and a foreign national, it is, as a rule, necessary to transcribe the marriage in the Portuguese civil registry beforehand, at the competent Portuguese consulate or, alternatively, at civil registry offices in Portugal. Transcription is often the first practical step in the timeline of the case.
Civil partnership. The substantive regime is Law 7/2001. For citizenship purposes, the evidence required is more robust: as a rule, a declaratory action for judicial recognition of the civil partnership of more than three years, with a final and unappealable judgment. This action proceeds before the competent civil court and has its own timeline — in 2026, depending on the district, it may take 12 to 24 months to reach a final judgment, with witness and documentary evidence. This step typically precedes the citizenship application. There are contexts in which the Central Registry Office accepts alternative forms of evidence, but the judicial action remains the safest route.
The initial consultation verifies, on the specific facts, what documentation is available and what procedural path is realistic.
Duration of the relationship and connection to the Portuguese community
The law requires three years of subsisting relationship at the date of the application — not three years before the start of the application. The count is performed:
- In marriage, from the date of celebration, evidenced by the corresponding certificate;
- In civil partnership, from the proven start of cohabitation in conditions analogous to those of spouses, as fixed by the judicial action.
The current wording of the law no longer expressly requires autonomous proof of “effective connection to the Portuguese community” in marriage-based or civil-partnership-based applications — a requirement which existed in earlier wordings and which subsists in some neighbouring regimes (descent through grandchildren, Sephardic regime). However, the Public Prosecutor retains standing to oppose on the basis of facts suggesting absence of a real relationship or simulation. For that reason, it is prudent to gather, from the pre-application phase, evidence of the reality of the relationship: family ties, regular presence in Portugal, civic and cultural life, professional and social networks, photographs, communications, common documents.
Civil records, transcriptions and foreign documents
The key element of most marriage-based applications is the state of the records:
- Transcription in Portugal of marriages performed abroad. As a rule, a precondition of the application. Performed at the competent Portuguese consulate or at civil registry offices in Portugal. Documentation apostilled or legalised and translated.
- Judicial recognition of the civil partnership. Where the route is the civil partnership, the judgment recognising the partnership and fixing the date of its start is the central document of the subsequent application.
- Birth certificates. Of the applicant and of the Portuguese spouse or civil partner, duly up to date.
- Documentary inconsistencies. Spelling variants of names, dates differing by a few days, different designations of places — all common and typically resolvable with technical handling, but require analysis before filing.
- Foreign documents. Apostille or consular legalisation depending on the country; certified translation into Portuguese.
The initial consultation exists precisely to map these elements before filing. Defective applications are not rare, and the cost of correcting them afterwards is, as a rule, higher than the cost of preparing them properly beforehand.
Risk of opposition and procedural analysis
The Public Prosecutor may oppose the acquisition of citizenship under article 9 of Law 37/81. The most frequent grounds of opposition are:
- Indications of simulation of the marriage or civil partnership — where the relationship appears to serve exclusively the citizenship outcome, without material reality;
- Manifest absence of life in common — facts demonstrating separate residences, autonomous lives, lack of elements typical of a continuous relationship;
- Relevant criminal records — namely a final conviction for an offence punishable by three or more years of imprisonment under Portuguese law;
- Matters relating to the security or defence of the State.
Where there is opposition, the applicant is notified and has a deadline to respond contentiously. The technical reading of the prosecutor’s submission is decisive — in many cases, the opposition is fully defeatable through appropriate evidence; in others, it may justify reformulation of the application or pivot to another route.
Careful preparation in the pre-application phase — particularly the documentary construction of a robust archive of the reality of the relationship — is the most effective way to minimise this risk. Not to eliminate it: the possibility of opposition is inherent to the process and cannot be entirely ruled out.
Administrative timelines and process risk
Actual processing times at the Central Registry Office in 2026 are not uniform: they vary with the specific route, the documentary complexity, any opposition from the Public Prosecutor and the administrative phase. We communicate estimates calibrated against recent observed practice for the type of file, not fixed deadlines, and we revisit them every fortnight.
The principal risk factors in marriage-based or civil-partnership-based applications include:
- transcription of the foreign marriage missing or defective;
- civil partnership recognition action without a final judgment or with imprecise fixing of the start date;
- documentary inconsistencies between certificates of origin;
- evidence of the reality of the relationship fragmentary or absent;
- criminal records left untreated or omitted;
- legislative or regulatory change during the proceeding;
- opposition from the Public Prosecutor on serious factual grounds.
Where there is opposition, contentious response is available. Where there is refusal, an administrative appeal is available and, where warranted, an action before the administrative courts. Where there is prolonged inaction, an action to compel the Administration to act is available.
How we work this area
The responsible partner reads the entire matter before the first reply. The initial consultation usually lasts 25 minutes and ends with a written framing of current viability, identification of prior transcriptions required, a realistic timeline for any civil partnership recognition action and a timeline estimate per phase, with a fee proposal where the matter permits.
From that point, the team handles documentary preparation, transcriptions in the Portuguese civil registry, any civil partnership recognition action, apostilles and translations of foreign documents and the filing at the Central Registry Office. We follow the file through to the publication of the birth record entry. Where there is opposition from the Public Prosecutor, we lodge the response. Where there is refusal, we lodge the appeal and, where required, bring contentious proceedings.
We are bound by the Statute of the Portuguese Bar Association (Law 145/2015) and by Law 6/2024 on legal advertising. We do not publish results-based metrics, we do not make comparisons with other firms, and we do not promise outcomes.
Frequently asked
What is the difference between marriage and civil partnership for citizenship purposes?
Marriage is a formal act, celebrated and recorded, and is proved by the marriage certificate. For marriages performed abroad, transcription in the Portuguese civil registry is, as a rule, a precondition of the application. Civil partnership, foreseen in Law 7/2001, requires reinforced evidence of cohabitation for more than three years — in practice, as a rule, by means of a declaratory action for judicial recognition of the civil partnership, with a final and unappealable judgment. Both routes are foreseen in article 3 of Law 37/81; the marriage route is technically more direct, the civil partnership route involves a prior procedural stage.
Is proof of effective connection to the Portuguese community required?
The law no longer requires, in its current wording, autonomous proof of effective connection in marriage-based applications. However, the Public Prosecutor may oppose the application on the basis of facts suggesting absence of real connection to the Portuguese community, with the applicant called upon to respond. For that reason, it is prudent to gather, from the outset, evidence of the reality of the relationship and of life in common — family ties, presence in Portugal, civic and cultural life, professional and social networks.
How are the three years of relationship counted?
In marriage, they are counted from the date of celebration, evidenced by the corresponding certificate (transcribed in Portugal where the marriage was performed abroad). In civil partnership, they are counted from the proven start of cohabitation in conditions analogous to those of spouses; it is that start date that the declaratory action fixes, on the basis of witness and documentary evidence. In both routes, the three-year requirement is verified as at the date of filing.
Does a marriage performed abroad need to be transcribed first?
As a rule, yes. Transcription of the marriage in the Portuguese civil registry is the way for it to produce full effects in Portuguese law, including for the purposes of citizenship acquisition. Transcription is performed at the competent Portuguese consulate or, alternatively, at civil registry offices in Portugal, with the documentation apostilled or legalised and translated. It is often the first practical step in the timeline of the case.
What may lead to opposition from the Public Prosecutor?
The Public Prosecutor may oppose the acquisition of citizenship where it considers that grounds exist for that — for example, indications of simulation of the marriage, manifest absence of life in common, relevant criminal records or matters relating to the security or defence of the State. Opposition is a contentious phase and has a deadline for response. Careful documentary preparation in the pre-application phase is the most effective way to minimise this risk.
Can I apply for citizenship even if the relationship has since ended?
The law requires that the marriage or civil partnership subsist as at the date of the application. If the relationship ended before the application, the marriage or civil partnership route is no longer available — without prejudice to other possible routes (for example, residency, descent, the Sephardic regime), which are analysed autonomously. If the relationship ends after the application but before the decision, the effect on the proceeding is assessed on a case-by-case basis.
Responsible author
Jorge Ferraz. Admitted to the Portuguese Bar since 2002. Leads the professional website DefesaLegal.pt. University lecturer in Portugal. Sustained practice in Portuguese citizenship matters, with particular focus on marriage-based and civil-partnership-based applications involving international transcriptions, recognition actions and management of opposition from the Public Prosecutor.
This page is a starting point. The actual analysis of your case begins at the initial consultation — 25 minutes, in person in Porto or by video, with a written framing afterwards.
Reviewed May 2026.