Portugal Tax Residence: When Americans and Britons Become Residents

You are a tax resident in Portugal for a year if you spent more than 183 days there in a 12 month period that starts or ends in that year, or if you had a home there that suggests you intend to live in it as your habitual residence. Article 16 of the personal income tax code (CIRS) sets these two tests, and the tax authority asks new residents to report their residence within 60 days.

This guide follows the CIRS text and the Portal das Finanças pages on the day we read them. It is not tax advice, and the tax office decides how it applies to your case.

What does Portuguese tax residence mean?

Tax residence is a separate question from immigration status. It decides which of your income the Portuguese personal income tax (IRS) can reach. Article 15 of the CIRS says that for people resident in Portuguese territory, IRS applies to all their income, including income earned outside Portugal. For non-residents it applies only to income obtained in Portuguese territory.

That is why the date you become a resident matters for an American or a Briton who still has income abroad: a salary from a foreign employer, a pension, rental income or investments. How that income is then taxed, and what a tax treaty or foreign tax credit does about double taxation, are separate subjects (see the end of this guide).

Your visa or residence permit is a different matter, covered in how the AIMA residence permit process works. The CIRS tests below do not mention it.

When do you become a tax resident in Portugal?

Paragraph 1 of article 16 gives four cases. Two apply to most newcomers:

The other two cases are for ship and aircraft crew on 31 December when the ship or aircraft serves an entity resident, seated or effectively managed in Portugal, and for people serving the Portuguese State abroad in public duties or commissions. They rarely concern a newcomer.

Meeting either of the two main tests is enough. You do not need both.

How are the days counted?

Article 16(2) says that any day, complete or partial, that includes a night (dormida) in Portugal counts as a day of presence. The 183 days can be spread across the period, and the 12 month period does not have to be the calendar year: it can start in one year and end in the next, as long as it begins or ends in the year being tested.

The code gives no further counting rules in this article. The tax office is the place to ask about a borderline count.

What counts as a home?

The code says a home “in conditions that suggest” a current intention to keep and occupy it as a habitual residence. The Portal das Finanças page on becoming resident adds that the home can be owned or rented. The pages we read do not define the conditions further, and they do not list what evidence the tax authority looks at, so we do not either.

A note on wording: the Portal das Finanças page on changing from non-resident to resident says “less than 180 days” for this second test. The code itself says “for less time”, that is, fewer days than the first test requires. We follow the code.

When does residence start in the year?

Article 16(3) says people who meet either test become resident from the first day of their period of stay in Portugal. The exception: if they were resident in Portugal on any day of the previous year, they are treated as resident from the first day of the year in which one of the tests is met.

So for a newcomer, residence normally begins on the first day of the stay that leads to meeting the test, not on 1 January and not on the day of registration. Article 15(3) says the scope rule above also applies to the cases of partial residence in paragraphs 3 and 4 of article 16, for each of the two residence statuses. The pages we read do not walk through how a part year is then calculated.

Is residence decided person by person?

Yes. Article 16(5) says tax residence is assessed for each taxpayer in the household. A spouse who arrives later, or stays fewer days, may be tested differently from you.

What if you leave Portugal or come back?

The code covers the way out too, which matters if you plan to move on or split time between countries.

• Residence is lost from the last day of stay in Portugal (article 16(4)), except in the two cases below.
• Article 16(14): if you lose residence in a year but stayed more than 183 days in Portugal that year, and later that year you earn income that would have been taxable and not exempt had you stayed resident, you are treated as resident for the whole year. Article 16(15) lifts this if you show that income is taxed by an identical or substantially similar income tax in another EU state, or in an EEA state where tax information is exchanged and administrative cooperation is provided for, or in another state at a rate not below 60% of the rate that would apply in Portugal.
• Article 16(16): if you regain residence in the year after the one in which you lost it, you are treated as resident for the whole of that year.

The pages we read stop at the text of the code. They do not give worked examples.

How do you report that you became a resident?

The Portal das Finanças page “Alteração de não residente para residente” says that, after either test is met, you must report your residence in Portugal within 60 days and update your registration. It places the reporting after the tests: the tests make you resident, and the report updates the tax authority’s records.

The non-resident to resident page, the FAQ and the tax authority’s leaflet for foreign citizens give two places to ask:

• Online: through the Portal das Finanças e-balcão, choosing Registo Contribuinte, then Identific, then Alteração Morada/Singulares.
• In person: at a tax office (Serviço de Finanças) or a Loja do Cidadão, by appointment.

The FAQ adds a limit: the plain “Entregar Pedido de Alteração” function under Dados Cadastrais, Morada is not available when the address on file is abroad and a foreign citizen wants to move from non-resident to resident. That change goes through the e-balcão or an appointment.

How many days does the tax authority give?

For foreign citizens and nationals without a Portuguese citizen card, the Morada page and the leaflet give two deadlines: 60 days when the change of address changes you from non-resident to resident or the other way round, and 15 days for other address changes.

What documents does the tax office ask for?

Americans and Britons are third-country nationals for this page, meaning from outside the EU, the EEA (Norway, Iceland, Liechtenstein), Andorra and Switzerland. The tax authority lists your passport and one of these, showing the address you want as your tax address:

• a residence permit valid on the date of the request (the non-resident to resident page says it is issued by the competent authority; the FAQ and the September 2026 leaflet say by AIMA)
• an AIMA document of manifestation of interest or request, from AIMA’s registration platforms (named on the non-resident to resident page); the FAQ and the September 2026 leaflet instead list a declaration proving that an application for international protection was filed, or a temporary protection title, issued by AIMA
• proof of an AIMA appointment, or a receipt for a request, in all other pending cases, such as grants or renewals of a residence permit

If those documents do not show the address, you can also present one of: the public deed of purchase of a home, a lease on a home, an employment contract, or a document issued by any public entity. If you give an address that differs from the one on the AIMA documents, you must show you asked AIMA to change it.

The tax authority’s FAQ says supporting documents must be originals or authenticated copies unless they can be validated electronically, and that foreign-language documents need a certified translation. A notary, a chamber of commerce and industry, a lawyer or a solicitor can certify it. The FAQ and the leaflet add that the translation can also be made by the Portuguese consulate in the country where the document was issued, or by that country’s consulate in Portugal.

Britons: the Portal das Finanças page lists the EU and EEA route separately. It does not mention people covered by the UK Withdrawal Agreement, so ask the tax office which list applies to you. Your NIF stays the same whatever the status; see how to get a Portuguese NIF.

Can residence be backdated?

The FAQ answers a question about changing from non-resident to resident “com efeitos retroativos” (with retroactive effect). The person must present a document that clearly shows the retroactivity wanted, such as a deed of purchase of a home, a lease or an employment contract, in originals or authenticated copies. The e-balcão accepts scanned documents. The pages do not say whether the tax office will always accept the date you ask for.

When does the new address take effect?

If you change the address through the Portal das Finanças, the FAQ says it takes effect only after you enter the confirmation code the tax authority sends by letter to the new address. Plan for that letter when you move.

What about the 90 days a visitor can spend in Portugal?

The days that count for tax are not the same thing as the Schengen short-stay allowance. A visitor’s 90 in 180 days is an immigration rule explained in the Schengen 90/180 rule for Americans and Britons. The tax test counts days with a night in Portugal against 183, or looks at whether you have a home. Neither page told us how one test affects the other, so check each on its own.

What does the code say about the non-habitual resident regime?

Article 16 of the CIRS, as published on the Portal das Finanças, shows paragraphs 8 to 12, which dealt with the non-habitual resident regime, as revoked by Law 82/2023 of 29 December. A transitional note under the article keeps the old rules for some people who were already registered or met listed conditions by set dates. What replaced the regime, and who qualifies, is for a separate guide. Do not assume either.

What this guide does not cover

• How foreign employment, freelance, pension, rental or investment income is taxed once you are resident, and which rates apply. We did not read the rate tables, so we state no rates.
• The tax treaty rules for deciding where you are resident when two countries claim you, and how to claim relief from double tax.
• Your U.S. obligations as a citizen living abroad. Start with do Americans still file U.S. taxes from Portugal.
• UK tax residence and what a Briton still owes HMRC.
• Social security residence, which has its own rules.
• The new-resident incentive regime that replaced the non-habitual one.

For the work routes that bring most newcomers to Portugal, see working in Portugal as an American or a Briton and the remote work visa. For the order of the first administrative steps, see the first month paperwork guide.

Related guides on this site: how foreign pensions are taxed in Portugal; what the U.S.-Portugal tax treaty says; UK taxes and HMRC for Britons in Portugal.

More guides on this site: remote work for a foreign employer: tax and social security; the IFICI regime for new residents.

Date of the information

The Portal das Finanças pages we read carry no date of their own. The tax authority’s leaflet on changing the tax address of foreign citizens is dated September 2026, the latest information in this guide; it gives only the month, so our update date is its first day. The CIRS article 16 page lists two amending laws, the most recent being Law 82/2023 of 29 December, which revoked paragraphs 8 to 12. Article 15 is cited as published by the same site.

Official pages read for this guide: CIRS articles 15 and 16 on the Portal das Finanças, the Portal das Finanças pages on changing from non-resident to resident and on the tax address, its FAQ on address changes for individuals, and the tax authority’s leaflet on the tax address of foreign citizens. All were read on 18 October 2026.