Almost every country taxes people because they live there. The United States taxes its citizens because they are its citizens. Moving to Portugal makes you a Portuguese taxpayer without making you any less of an American one, and that is the single fact the rest of this page hangs from.
When Portugal starts taxing you
Portuguese tax residence is decided by CIRS art. 16: more than 183 days in Portugal in any 12-month period, or a home held here in conditions that imply you intend to keep it as your habitual residence. Your visa is not part of that test. A D7, a D8 or a golden visa is an immigration status; art. 16 decides the tax question on presence and housing alone.
- Residence begins on the first day of the stay, not on 1 January (art. 16 n.º 3).
- If you were resident on any day of the previous year, it backdates to 1 January instead.
- It ends on the last day of presence (art. 16 n.º 4).
Once resident, Portugal taxes your worldwide income under art. 15 n.º 1 — including the income the US is also taxing. Before that day, foreign income is outside Portuguese scope entirely, not exempt from it, so salary earned in March by someone who arrives in April is simply not Portugal's.
The saving clause, and why the treaty does not rescue you
The 1994 convention between Portugal and the United States allocates taxing rights between the two states in the ordinary way — and then the saving clause puts the United States back in for its own citizens, reserving the right to tax them as if the convention did not exist.
So the treaty's job, for an American, is not to remove the US filing. It is to decide which country's tax is credited against the other's, and at what rate the source country may withhold.
| Income | Ceiling | Article |
|---|---|---|
| Dividends | 15% of gross | art. 10 |
| Interest | 10% of gross | art. 11 |
| Royalties | 10% of gross | art. 12 |
These are ceilings on the source state, not rates that apply by themselves. A broker withholding at a domestic rate rather than the treaty rate creates tax that Portugal will not credit — CIRS art. 81 n.º 2 caps the Portuguese credit at the treaty rate, and the excess is reclaimed from the other country or lost. Our sources do not settle the reduced 10% and 5% dividend rates for substantial corporate holdings, so this page does not state them.
Pensions: two payments, two rules
| Payment | Who taxes it | Article |
|---|---|---|
| Private pension from past employment | Residence state only — Portugal | art. 20(1)(a) |
| Social Security and other public pensions | The paying state may tax — the US | art. 20(1)(b) |
| Government-service pension | Governed separately | art. 21 |
FEIE or the foreign tax credit
Two reliefs exist on the US side and they are not interchangeable. The foreign earned income exclusion on Form 2555 excludes foreign earned income up to an annually indexed cap. The foreign tax credit on Form 1116 credits the foreign income tax you actually paid.
| Tax year | Maximum exclusion |
|---|---|
| 2025 | $130,000 |
| 2026 | $132,900 |
Where a married couple both work abroad and both meet the bona fide residence or physical presence test, each can claim the exclusion on their own earnings. The exclusion applies to earned income — it does nothing for dividends, interest, rent or gains.
Which relief is better depends on your Portuguese effective rate, and Portuguese rates on self-employment are often high enough that the credit beats the exclusion — but that is a calculation per person, not a rule. Run the 2026 IRS bands against your own numbers before assuming the exclusion is the obvious choice.
The two account reports, and they are different tests
Americans in Portugal have three account-reporting obligations across two countries, and each has its own trigger. Satisfying one says nothing about the others.
| Report | Trigger | Filed with |
|---|---|---|
| FBAR (FinCEN 114) | Aggregate over $10,000 across all foreign accounts at any point in the calendar year | FinCEN — not attached to the 1040 |
| Form 8938 | Over $200,000 of specified foreign financial assets at year end while living abroad, or over $50,000 while living in the US; both double on a joint return | Attached to the US return |
| Quadro 11, Modelo 3 folha de rosto | Holding, benefiting from or being authorised to move any account outside Portugal — no income threshold at all | Portal das Finanças |
The FBAR is due 15 April for the calendar year reported, with an automatic extension to 15 October that you do not have to request. The Portuguese box is the one Americans miss more often, because it has no threshold: a dormant account and an account you are merely a signatory on both go in quadro 11, and a foreign branch of a Portuguese bank counts as foreign.
The LLC problem
A US LLC is a pass-through in the United States. Portugal is reported not to treat it as transparent — AT's position, in an account of a ruling from late 2024 that we have read second-hand and not in the original, is that the LLC is opaque. What the owner thinks of as "my income" is then a distribution from a company: a different category, taxed on different rules, at a different time.
This is the structure Americans most often arrive holding, and a single-member LLC managed from a laptop in Lisbon is the worst version of it — the entity most likely to be recharacterised, and the one whose place of effective management is most obviously Portuguese. We record that as a reported position rather than advice, because whether a particular structure holds up turns on facts a page cannot see.
Which annexes you file
Modelo 3 is filed between 1 April and 30 June, and the Code applies 30 June whether or not it is a business day. The annexes divide by what you have, not by where you are from.
| Annex | For |
|---|---|
| Anexo J | Income obtained abroad, and the foreign tax paid on it |
| Folha de rosto, quadro 11 | Foreign accounts — no income threshold |
| Anexo B or C | Self-employment: simplified regime, or organised accounting |
| Anexo G / G1 | Capital gains |
| Anexo L | The NHR or IFICI regime, if you are on one |
IFICI is worth checking before you arrive rather than after: EBF art. 58.º-A n.º 7 applies the 20% rate only from registration, not retroactively to the day you landed, and the application is due by 15 January of the year after you become resident. Note that it exempts most foreign income with progression — which changes your Portuguese bill without changing your American one at all.
Do I still have to file a US tax return if I live in Portugal?
Yes. The United States taxes its citizens on worldwide income regardless of where they live, and the saving clause in the Portugal–US convention preserves that right expressly. The treaty decides credits and withholding ceilings; it does not end the filing obligation.
Is the FEIE or the foreign tax credit better in Portugal?
It depends on your Portuguese effective rate and your income type. Portuguese rates on self-employment are often high enough that the credit is worth more than the exclusion, but that is a calculation to run, not a rule. The exclusion also only covers earned income — dividends, interest, rent and gains are outside it.
How much is the foreign earned income exclusion?
The IRS gives $130,000 per qualifying person for tax year 2025 and $132,900 for 2026. Where both spouses work abroad and both qualify, each can claim it on their own earnings.
When do I have to file an FBAR?
When your foreign accounts together exceeded $10,000 at any point in the calendar year — the peak, not the year-end balance. It is due 15 April with an automatic extension to 15 October, it is filed with FinCEN rather than attached to the 1040, and whether the accounts produced income makes no difference.
Does Portugal tax my US Social Security?
Under art. 20(1)(b) of the convention, Social Security and other public pensions may be taxed by the paying state — the United States. A private pension from past employment is different: art. 20(1)(a) gives it to the state of residence alone.
Does Portugal treat my LLC as a pass-through?
Reportedly not. AT's position, per an account of a 2024 ruling, is that a US LLC is opaque in Portugal even where it is a disregarded entity or partnership in the US. A single-member LLC managed from Portugal is the most exposed version. Get it looked at before you rely on the US characterisation.
Do I report my Portuguese bank account to the IRS and my US account to Portugal?
Both, on separate tests. The US side is FBAR at $10,000 aggregate and Form 8938 at the FATCA thresholds. The Portuguese side is quadro 11 of the Modelo 3 folha de rosto, which has no threshold and catches accounts you merely have authority to move.