Portugal Dual Citizenship: 2026 Rules and Requirements

Portugal dual citizenship is allowed with no conditions attached. Portuguese nationality law has never required anyone to give up an existing passport, and the reform passed in May 2026 left that untouched. Article 27 of Lei 37/81 says only that where a person holds two or more nationalities and one of them is Portuguese, Portuguese nationality is the one that counts before Portuguese authorities.

What did change is how long you wait and what you have to prove. Lei Orgânica 1/2026 came into force on 19 May 2026 and rewrote the residence periods, the way that residence is counted, the integration requirements and several of the routes themselves. Every figure below comes from the published text, listed with its article number in the sources section at the end.

1. Does Portugal allow dual citizenship?

Yes, without restriction. There is no provision anywhere in Lei 37/81 requiring renunciation of a previous nationality, and no cap on how many nationalities a Portuguese citizen may hold. Triple nationality is permitted on the same terms.

Article 8 covers the only way a Portuguese citizen loses nationality by choice: they declare that they do not wish to be Portuguese, and only if they hold another nationality. It is voluntary and it is a separate act. Acquiring Portuguese nationality does not trigger it.

Portugal permits dual nationality, so the question is whether your own country does. Most do but a few still require renunciation.

2. Portugal dual citizenship for US citizens

The United States does not require its citizens to renounce US nationality when they acquire another one. Naturalising as Portuguese does not put your US citizenship at risk.

Where US applicants sit differently from most is the residence period. Lei Orgânica 1/2026 splits naturalisation into two tracks: seven years for nationals of Portuguese-speaking countries and citizens of EU member states, ten years for everyone else. Americans, British, Canadians and Australians fall into the second group.

3. What the 2026 nationality law changed

Lei Orgânica 1/2026 was published in Diário da República on 18 May 2026 and came into force the following day. It is the eleventh amendment to Lei 37/81 and it republished the whole statute.

Six changes matter to anyone applying from outside Portugal.

Who is decided under the old rules

Article 7(2) is the transitional provision, and it is narrow. The previous version of the law applies to administrative procedures pending on the date the new law entered into force. That means a nationality application already filed and awaiting decision on 19 May 2026.

A residence permit is not a pending nationality procedure. Neither is an expression of interest, nor a residence application under review at AIMA. Someone who reached five years of legal residence in April 2026 and had not yet filed is now under the ten-year rule

4. Routes to Portuguese citizenship

Portuguese nationality is either attributed, meaning it is treated as having existed from birth, or acquired. The distinction changes what you have to prove.

Children of a Portuguese parent

Article 1(1)(c) attributes Portuguese nationality to a child of a Portuguese mother or father born abroad, on registration of the birth in the Portuguese civil registry or on declaration that they wish to be Portuguese. There is no residence requirement, no language test and no minimum age. The parent must have held Portuguese nationality at the time of your birth.

The route stands on documents: your full birth certificate, your parent's Portuguese identification, and proof of the parent's nationality at the relevant date.

Grandchildren of a Portuguese citizen

Article 1(1)(d) covers applicants with at least one grandparent of original Portuguese nationality who did not lose it. Residence in Portugal is still not required.

The 2026 reform added a condition. Article 1(3) now requires applicants under this route to meet the requirements in article 6(1)(c) through 6(1)(h), which are the naturalisation requirements on language, culture, history, symbols, civic knowledge, the solemn declaration and the criminal record. Grandchildren applying from abroad now sit the same test as someone naturalising after ten years of residence.

Effective connection to the national community is also assessed.

Naturalisation after legal residence

Ten years for US and other non-EU nationals, seven for EU and Portuguese-speaking country nationals, four for stateless applicants.

The years count from the residence permit, not from the visa. A D7 visa or a D8 visa is what allows you to enter Portugal and apply for the permit at AIMA. Counting starts when the permit is issued.

EU citizens enter Portugal without a visa and reach naturalisation on the seven-year track in the same way

Marriage and civil union

Article 3(1) allows a foreign national married for more than three years to a Portuguese citizen to acquire nationality by declaration during the marriage. Residence in Portugal is not required.

Civil unions are treated separately and less simply. Article 3(3) requires more than three years of cohabitation and a court judgment recognising the union before the declaration can be made.

Both can be challenged after they are granted. The Public Prosecutor has two years from the date the acquisition is registered to oppose it, under article 10(1). The ground is the absence of effective ties to the national community, assessed against the same criteria that apply to naturalisation under article 6(1)(c) to 6(1)(i).

Article 9(2) closes that ground where the marriage or union has lasted more than six years, or where the couple has children of Portuguese nationality. Opposition on grounds of criminal record, national security or international restrictive measures stays available in every case.

Born in Portugal to foreign parents

Article 1(1)(f) attributes nationality to a person born in Portugal to foreign parents, on declaration, provided one parent was legally resident in Portugal for at least five years at the time of the birth. Article 6(2) covers minors born in Portugal through naturalisation, on the same five-year parental residence condition plus regular school attendance.

Great-grandchildren

Article 6(8) lets the government grant nationality by naturalisation to a third-degree descendant in the direct line of an original Portuguese national who has been legally resident in Portugal for at least five years. Those five years stand in place of the general period.

5. Portugal dual citizenship requirements

The Portugal dual citizenship requirements for naturalisation are set out cumulatively in article 6(1). All of them have to be met at the moment the application is filed.

The culture and history test does not exist yet

Article 4 of Lei Orgânica 1/2026 gave the government ninety days from publication to amend the Nationality Regulation, approved by Decreto-Lei 237-A/2006. That deadline expired on 16 August 2026 without publication.

Until the amended regulation appears, the format of the culture and history test, the certificates that will be accepted in place of it, and the standard for proving subsistence are all undefined. The A2 language level that applicants have used for years comes from the current regulation and may be revised upward when the new one is published.

Nationals of Portuguese-speaking countries are presumed to meet the language part under article 6(10), unless a clear lack of command is evident.

Criminal record

The threshold is a final conviction carrying an actual prison sentence of more than three years, for terrorism, violent or especially violent crime, highly organised crime, crimes against state security, or aiding illegal immigration.

The published text of 18 May contained a contradiction, with article 6(1)(f) setting three years and article 6(11) setting two. Declaração de Retificação 17/2026/1, published the same day, corrected article 6(11) to match at three years.

Article 6(14) makes the criminal record requirement a rebuttable presumption assessed by the Public Prosecutor, who weighs the sentence, the offence, the time since it, any reoffending, and the applicant's ties to the national community. Article 6(15) allows a court challenge where the prosecutor applies the bar.

6. How to get dual citizenship in Portugal

Descent and marriage routes skip the residence steps and follow the same filing path.

What to prepare

Filing and registration

7. Tax as a dual citizen

Portugal taxes on residence, not on nationality. If you hold a Portuguese passport and live outside Portugal, you file nothing here on foreign income. If you live in Portugal, you are taxed as a resident whatever passport you hold.

The United States is one of the few countries that taxes on citizenship. A US citizen who becomes Portuguese and moves to Portugal keeps annual IRS filing obligations, along with FBAR and FATCA reporting where applicable.

8. Citizenship or permanent residency

Permanent residency comes from the immigration regime, under article 80 of Lei 23/2007, and Lei Orgânica 1/2026 did not touch it. It is still granted after five years of temporary residence, half the wait that now applies to naturalisation for non-EU nationals.

Day to day the two are close. A permanent resident lives and works in Portugal without restriction, uses the SNS and state schools on the same terms as a citizen, and travels in the Schengen area. Both ask for proof of basic Portuguese. The card is renewed every five years, although the right behind it does not expire.

What citizenship adds is the passport, the vote, the right to live and work in any other EU member state, and nationality that passes to your children.

9. Sources