Taxes for Americans living in Portugal: what falls under Portuguese law, and where your US accountant comes in

Of all the worries Americans bring to a move to Portugal, tax is the deepest — and for a specific reason. The United States is one of the very few countries that taxes its citizens on their worldwide income no matter where they live. An American in Lisbon still files with the IRS. That single fact colours every tax question that follows.

This guide draws a clear line. It explains the Portuguese side of your tax picture — what Portugal taxes, when you become a Portuguese tax resident, and how the treaty is meant to prevent the same income being taxed twice. It does not, and cannot, replace your US accountant, who handles your American filing. The goal here is to give you the Portuguese half clearly, so the two halves can be made to fit.

When Portugal starts taxing you: residency

Everything begins with tax residency. You generally become a Portuguese tax resident if you spend more than 183 days in Portugal in a year, or keep a home here in a way the law treats as habitual.

The consequence is significant: once you are a Portuguese tax resident, Portugal taxes your worldwide income, not only what you earn in Portugal. Many Americans arrive on a D7 or D8 visa without fully registering that this triggers Portuguese worldwide taxation from the start. It is not a trap — it is simply how residence-based taxation works — but it should be understood before you arrive, not discovered afterwards.

If you are not a Portuguese tax resident but own assets here, Portugal taxes you only on Portuguese-source income — rent from a Portuguese flat, gains on Portuguese property.

The end of NHR, honestly stated

For years, the answer to "how are Americans taxed in Portugal?" leaned on the Non-Habitual Resident regime and its generous exemptions. That era has closed. The NHR regime ended for new entrants, and its replacement — IFICI, sometimes called "NHR 2.0" — is narrow, aimed at specific scientific, technical, and research roles.

For most American retirees and remote workers, the broad tax break is no longer available, and any plan built on it needs rethinking. We would rather tell you that plainly than let you move on a false premise.

The treaty: what it does, and its famous catch

There is a US–Portugal tax treaty, in force since 1996, and its purpose is exactly the one you would hope: to stop the same income being taxed twice, and to decide which country taxes what. In broad strokes, and as general orientation only:

Real-property gains are generally taxable where the property is located.
Private pensions are generally taxed in the country of residence — though, for US citizens, with a crucial qualification below.
US Social Security the treaty allows the United States to tax.

The catch every American must know: the treaty contains a "saving clause" that preserves the US right to tax its citizens broadly, as if much of the treaty did not exist. Relief from double taxation is then delivered through mechanisms your US accountant works with — the Foreign Tax Credit, exclusions, and treaty positions — rather than by the treaty simply switching off US tax. This is precisely why the US side belongs with a US professional.

And beyond tax itself, there are reporting obligations — the disclosure of foreign accounts and assets — that carry heavy penalties if missed, even when no tax is owed. These, too, are US filings, and your accountant's domain.

Where the line falls — and why that protects you

We are deliberately clear about this division, because a firm that blurs it does you harm:

What we handle (the Portuguese side):

Whether and when you become a Portuguese tax resident, and what that means.
What Portugal taxes, at what rates, with what reliefs — on your income, your Portuguese rental, a property sale — including when you buy to let.
The Portuguese treatment that your US accountant needs in order to claim credits correctly on the US return.
Wills, succession, and property structured soundly under Portuguese law.

What your US accountant handles (the US side):

Your annual US return and the treaty positions on it.
Foreign-account and foreign-asset reporting.
The credits and exclusions that turn "taxed twice in theory" into "coordinated in practice."

The two must talk to each other. A great US accountant working without the Portuguese analysis, or a Portuguese lawyer ignoring the US return, each leaves you exposed. Our role is to make the Portuguese side accurate and legible — and to coordinate, not to overreach.

What we do

We are a law firm in Portugal. We give you a clear reading of the Portuguese tax picture — residency, what Portugal taxes, how the treaty positions your Portuguese income and gains — and we structure your property and succession soundly under Portuguese law. We coordinate with your US accountant, who handles your American filing and reporting.

We will not promise to erase your US obligations or to revive a tax regime that has ended. We will give you the Portuguese half, clearly, and make sure it fits the American half.

Information note

This text is for information only and does not replace individual advice, and it is not US tax advice. The rules and treaty provisions cited should be checked in their version in force, with a qualified professional. Submitting an initial enquiry does not, by itself, create a lawyer–client relationship.