Moving to Portugal from the US: the ten-year citizenship clock and the treaty's saving clause

Search for how to move to Portugal from the United States and the first screen mixes three kinds of page: Reddit and a Facebook group, a shipping company, and specialist firms who have written the guide properly.

The specialists have caught up on the big number. Ten years to citizenship, not five, and seven for nationals of the European Union and the Portuguese-speaking community. That was still being printed wrong in the spring; most of it is right now.

What is still missing is the sentence after that one. Ten years counted from when?

Portuguese citizenship takes ten years, and the starting line moved on 19 May 2026

The Portuguese Nationality Act counts "legal residence". Article 15 says what that means, and the article has been rewritten twice in two years in the part that matters to somebody who is waiting.

In March 2024, Lei Orgânica 1/2024 inserted a fourth paragraph into article 15. It said that the time elapsed since temporary residence was applied for also counts, provided the application is eventually granted. Portugal's immigration agency, AIMA, has a queue that people wait in for a long time. That paragraph turned the wait into credit.

On 19 May 2026, Lei Orgânica 1/2026 repealed it. The repealing provision, article 5, is a list, and the last item on the list is «o n.º 4 do artigo 15.º da Lei n.º 37/81». The paragraph now reads, in the consolidated text, «4 — [Revogado.]»

So there are two regimes, not one date.

If your nationality proceeding was already pending on 19 May 2026, article 7(2) of the new law keeps the previous text for it — paragraph 4 included — and your queue still counts.

If it was not, paragraph 4 does not exist for you, and what remains is paragraph 1: you reside legally in Portugal when you are here with your situation regularised before the Portuguese authorities under any of the titles, visas or authorisations of the immigration or asylum regime. That is broader than a residence card — a national residence visa is a visa — but a pending application for one is not a title, a visa or an authorisation. It is a request for one.

We are deliberately not writing the sentence you will see elsewhere, that the period "runs from the issue of the residence permit". That is a paraphrase of a repeal rather than a rule the statute states, and it is wrong for pending files. We published that sentence ourselves and had to correct six pages.

Interrupted residence in Portugal: the twelve-year window for an American

The other half of article 15 rarely appears in English at all. Paragraph 3 lets separate periods of legal residence be added together, so long as they all fall inside a window: six years for stateless persons, nine for nationals of Portuguese-speaking countries and of EU member states, twelve for citizens of other countries.

An American is in the third limb. Ten years of residence, assembled if necessary out of interrupted periods, inside a twelve-year frame.

This is the opposite of the Greek rule, where all three naturalisation periods are «συνεχή» — continuous — and a gap restarts the count. If you are comparing the two countries, that difference is worth more than most of what the comparison pages will tell you.

You can put your own dates into our naturalisation clock, which carries both.

The visa routes for Americans moving to Portugal are not on this page

There is no US-specific route into Portugal. An American is a third-country national and uses the ordinary ones: the D7 for passive income, the D8 for remote work, the investment permit. Their thresholds, their article numbers and what each does and does not require are in the Portugal residence guide, the D8 page and the golden visa page. The full naturalisation picture is in Portugal's nationality law. None of it changes because the applicant is American, and this page does not repeat it.

What does change is the rest of this page.

The saving clause is not where a lawyer would look for it

The United States and Portugal have an income tax convention signed in Washington on 6 September 1994, effective from 1 January 1996. It is a modern treaty and it does the ordinary things: allocates taxing rights, relieves double taxation, defines residence.

It also, like every US treaty, reserves to the United States the right to tax its own citizens regardless. That reservation is what surprises people, because it means the convention does not stop the United States taxing an American who lives in Lisbon. It allocates and relieves. It does not release.

Here is the part that is genuinely a trap. In most US tax conventions that reservation is a paragraph of Article 1, General Scope. In this one, Article 1 is a single sentence, and this is the whole of it:

> "This Convention shall apply to persons who are residents of one or both of the Contracting States, except as otherwise provided in the Convention."

The saving clause is in the Protocol, at paragraph 1(b) — a separate instrument printed after the signature block:

> "Notwithstanding any provision of the Convention except paragraph (c) of this provision, a Contracting State may tax its residents (as determined under Article 4 (Residence)), and the United States may tax its citizens, as if the Convention had not come into effect."

Paragraph 1(c) lists the exceptions to it.

So a reader who opens the convention, turns to Article 1 because that is where this clause lives in other treaties, finds one sentence about personal scope and concludes there is no saving clause has read exactly the right article and reached exactly the wrong answer. Both official texts are one click away — the IRS and the US Treasury each publish the whole thing, Protocol included — and this is checkable in the time it takes to search the page for the word "Notwithstanding".

Which social security system you actually pay into

This is the most mechanical answer in the whole subject, and it is the one that changes a freelancer's monthly arithmetic.

The United States and Portugal have had a totalization agreement in force since 1 August 1989. Its job is to stop one person paying into two social security systems for the same work.

The rule for the largest group of people who move:

A self-employed worker who resides in Portugal is assigned Portuguese coverage. Not American. The exemption from the US system is established with a certificate of coverage — form P/USA 1 — requested from the regional centre of the Portuguese social security system where you are registered.

An employee taken on by a Portuguese employer is in the same position, with the employer requesting the certificate.

If Greece was also on your list: the same agreement type produces form GR/USA 1 there, from the Greek collecting agency. The pattern is the agreement's own, and it cannot be guessed for a third country without reading that country's pamphlet.

Taxes for Americans in Portugal: what this page will not compute

We are not going to compute your tax. An American's position in Portugal is the interaction of the Portuguese charge with a US return that keeps arriving every year, mediated by foreign tax credits and by a Protocol paragraph that preserves US taxation. That is a calculation on one person's figures in two systems.

We are not going to tell you whether the Portuguese incentive regime is worth it to you. The regime that replaced NHR reduces *Portuguese* tax. Reducing the Portuguese side of that equation does not automatically reduce the total, and in some configurations reduces the credits available on the other side rather than the tax paid.

And we are going to say plainly who does this better than we do. Taxes for Expats — a US tax firm — maintains dedicated pages on the US–Portugal convention, on dual-citizenship taxation and on the incentive regime for US citizens. On the tax layer they have standing we do not. Our subject is the European instruments: which statute, which paragraph, which date, and what changed.

We are not going to print US filing thresholds or foreign-account reporting limits. Those are US rules published by US authorities. Naming them is useful; reciting figures we have not read at their source is exactly what we criticise other pages for.

What the leading guide for Americans moving to Portugal leaves out

Get Golden Visa's guide for Americans is a thorough page — forty-five thousand characters — and it has the ten years right, including the seven for EU and CPLP nationals. Read on 8 September 2026, it contains no statement of when the ten years begin: not the repeal, not article 15, not the queue, not any account of what makes residence legal for counting. It also contains no mention of the convention, the saving clause or the totalization agreement; social security appears once, as a note that US benefits continue to be paid.

That is one page, named, opened in full, and it is the only page we are making a claim about.

Frequently asked questions about moving to Portugal from the US

More on Portuguese visas, residence and citizenship

Routes and thresholds are in the Portugal residence guide; remote work is in the D8 page; the investment route is in the golden visa page; the whole naturalisation picture, including the repeal that this page turns on, is in Portugal's nationality law. What Portugal costs, from INE rather than from crowd-sourced submissions, is in the cost of living in Portugal.

Every Portuguese instrument named here has its own line, with the date it was read, on our sources page.