To say, or not to say, “I do”: when am I obliged to register my marriage in Portugal?

4 June 2025
Danielle Avidago
Danielle Avidago, photography (immigration consultant)

Danielle Avidago | Immigration Consultant

In this globalised world we live in, it is not uncommon for one Portuguese Jew to get married to a Ukrainian Orthodox in an aphrodisiac beach in the Dominican Republic, have Christian children in Australia, and retire in Portugal. With this private international law mess, one might wonder: in which of these countries am I obliged to register my marriage? Portugal? Ukraine? Australia? All of them?!


Well, I cannot speak for other legal jurisdictions, but I can detail in which scenarios you are obliged by law to register your marriage in Portugal, and in which you are not:

Who is legally required to register their marriage in Portugal, and under what circumstances?

I am a Portuguese citizen who married a Ukrainian citizen in the Dominican Republic. Do I have to register my marriage in Portugal?

Yes, you are obliged by law to register your marriage in Portugal. Every citizen is obliged to update Portugal on their civil status, permanent residence, vital status, and other aspects that identify and protect the citizen in question. Updating your civil status early ensures clarity for future generations, simplifying legal processes that may affect your children later.

I am an Indian citizen who married a Canadian citizen in Jamaica and wish to live in Portugal. Do I have to register my marriage in Portugal?

No, only Portuguese citizens or those who married a Portuguese citizen are obliged to register their marriage in Portugal. A duly legalised version of your marriage certificate will be enough to apply for a residence visa and permit, so you can start your beautiful new chapter together in Portugal. 

I am an American citizen who married a Portuguese citizen in New York, wishing to move to Portugal with our children, to apply for a residence permit as a family member of a Portuguese citizen. Do we have to register our marriage in Portugal?

Yes, because you married a Portuguese citizen, and the Portuguese legal system needs to be informed of this status change so that it can provide residency status for you and your children as the spouse and child of a Portuguese citizen. Registering your marriage in Portugal as early as possible, even before moving, will make life much easier for you and your family.

I am a Mexican citizen who married a Portuguese citizen 6 years ago, and I wish to apply for Portuguese citizenship. Do we have to register our marriage?”

Yes, to apply for Portuguese citizenship for marriage, you are obliged to register your marriage in Portugal. A duly legalised version of your marriage certificate will not suffice for the intended purpose. 

I am an English citizen who has been legally living and working in Portugal for over a year with my Moroccan wife. We now need to provide our tax return to the Portuguese tax authority, and I wish to do so together, as a married couple, and not as separate individuals. Do I have to register our marriage in Portugal?

No, for tax purposes, you do not need to register your marriage in Portugal. You can simply declare to Finanças that you are married and immediately start benefiting from that specific regime. A duly legalised version of your marriage certificate shall suffice. 


To summarise, if you are a Portuguese citizen who got married abroad, you are legally required to register your marriage. Whether you plan to return to Portugal someday or remain elsewhere, notifying your home country of this significant milestone early on will help ensure a smoother future for you and your children.


On the other hand, if you are not a Portuguese citizen, nor have you married a Portuguese citizen, you are not obliged to register your marriage in Portugal. It is possible, however, to request the Civil Registry Office of the foreigner's area of residence to register their marriage if a “legitimate interest” can be proven. A legitimate interest in the eyes of the IRN simply means a concrete reason where the registry of marriage will impact the desired procedure. The Civil Registry may, however, refuse to register the marriage if they do not consider that a real, legitimate interest is behind the request. 


Foreigners may, of course, get married in Portugal when they complete at least 30 days residing in a fixed location in Portugal. But to get married elsewhere and register the marriage in Portugal is not a necessary action for most people´s daily life, nor is it obligatory by law. 


Do you see yourself in any of the above situations? Or perhaps you have a unique case that requires clarification to determine the best course of action? Rest assured, we would be delighted to guide you in deciding whether saying 'I do' in Portugal is the right step for you.



In Portuguese law, an employment relationship is characterised by the existence of subordination.
by Margarida Tempera 6 June 2025
Hiring in Portugal imposes numerous obligations on employers, many of which are not always intuitive to those unfamiliar with the national legal framework.
If you live or earn in Portugal, confirm if you must file IRS and stay compliant with tax rules.
by Diogo Pedro 30 May 2025
The deadline to submit the Portuguese Personal Income Tax return (IRS) for income earned in 2024 is 30 June 2025.
Company dissolution in Portugal requires proper steps to ensure a smooth, legally compliant closure.
by Tomás Melo Ribeiro 29 May 2025
Company dissolution in Portugal starts liquidation, a legal process. The business stops but exists until formally closed. Shareholders decide the legal path.
Renting property in Portugal—whether long-term or buy-to-let—can be both profitable and rewarding.
by Margarida Tempera 28 May 2025
Portugal protects tenants, but landlords have legal ways to reclaim property and unpaid rent, with eviction and debt recovery procedures, lease or not.
Since 1 December 2023, applications are only submitted online via a lawyer or previously in person.
by Joana Loureiro Veríssimo 27 May 2025
Portuguese nationality is a right that can be acquired through various means: birth, marriage, parentage, length of residence, or Sephardic Jewish ancestry.
The injunction process lets creditors secure an enforceable title without a full declaratory lawsuit
by Margarida Tempera 22 May 2025
Portuguese law provides a fast, cost-effective and accessible solution through the injunction procedure, established by Decree-Law no. 269/98 of 1 September.
Became Portuguese after birth via an administrative request and by fulfilling legal requirements.
by Sara Sbai Oliveira 20 May 2025
Portuguese Nationality Law No. 37/81 outlines pathways to citizenship: attribution and acquisition. This article focuses only on acquisition.
The 2025 elections took place yesterday, with the Democratic Alliance (AD) securing victory.
19 May 2025
The right-wing coalition of the Social Democratic Party (PSD) and the People's Party (CDS) won 32.7% of votes, securing 89 parliamentary seats.
Proper legal guidance is essential to ensuring parental responsibilities are fulfilled.
by Joana Torres Fernandes 15 May 2025
This overview aims to assist individuals considering divorce or already in the process of separating and having children.
Portugal shall hold a parliamentary election on Sunday, 18 May 2025.
14 May 2025
This guide aims to provide voters with essential information on Portugal’s upcoming 2025 election, including how to exercise their democratic right.
More posts