US Taxes While Living in Portugal: What Every American Needs to Know

Moving to Portugal does not end your relationship with the IRS. The United States is one of the very few countries that taxes its citizens wherever they live, so as an American in Portugal you deal with two tax systems at once. That sounds alarming, and it is complicated, but it is very manageable once you understand the main pieces.

This guide explains those pieces in plain English. It is not tax advice: every situation is different, and this is an area where an hour with a good cross-border adviser pays for itself many times over.

You Still File a US Tax Return

As a US citizen or green card holder, you must file a federal return every year, even if you earn all your income in Portugal and owe nothing to the IRS. Two useful facts:

Filing is the obligation. Thanks to the tools below, many Americans in Portugal end up owing little or no US tax, but only if they file correctly.

Becoming a Portuguese Tax Resident

Portugal taxes its residents on their worldwide income. You generally become a Portuguese tax resident if you spend more than 183 days in Portugal in a 12-month period, or if you have a home here that you intend to keep as your habitual residence.

Portuguese income tax (IRS, confusingly the same letters as the American agency) is progressive, with rates rising to 48% at the top, plus a solidarity surcharge on very high incomes. Portugal's tax year is the calendar year, and the annual return is usually filed between April and June.

How Double Taxation Is Avoided

The United States and Portugal have had a tax treaty since the 1990s. Together with US domestic rules, it means you should not normally pay full tax twice on the same income. The two main US tools are:

Which one is better depends on your income type and amounts, and they interact in ways that are easy to get wrong. This is exactly where professional help is worth it.

FBAR: Reporting Your Portuguese Bank Accounts

If the combined balance of all your non-US financial accounts goes over $10,000 at any point in the year, you must file an FBAR (FinCEN Form 114). This is a report, not a tax, but the penalties for not filing can be severe.

Your Portuguese current account, savings account and any other foreign accounts count towards the $10,000. Once you have a Portuguese bank account with your rent deposit and a few months of living costs in it, you will almost certainly cross the threshold.

FATCA and Form 8938

FATCA is the reason some banks ask Americans for extra paperwork. It requires foreign banks to report American account holders to the IRS, and it requires you to report certain foreign assets on Form 8938 with your tax return, if they exceed higher thresholds. For Americans living abroad, those thresholds start at around $200,000 at year end for a single filer, higher for married couples filing jointly.

In practice, FATCA means:

Social Security, Pensions and Retirement Accounts

Americans retiring to Portugal often have a mix of Social Security, private pensions, IRAs and 401(k)s. How each is taxed depends on the treaty and on Portuguese law, and the answers are not always intuitive. A few general points:

The Investment Trap: PFICs

Here is a mistake that catches many Americans. Most non-US mutual funds and ETFs, including the funds a Portuguese bank will offer you, count as PFICs (Passive Foreign Investment Companies) for US tax purposes. PFICs are taxed punitively and require complicated reporting.

The simple rule: do not buy funds through a Portuguese bank or broker without checking the US tax consequences first. Many Americans keep their investments with a US broker that allows clients living abroad.

What About NHR?

You may have read about Portugal's NHR regime, which offered foreign residents very low tax rates for ten years. It closed to new applicants in 2024. It was replaced by a narrower incentive, often called IFICI or "NHR 2.0", aimed at specific professions such as research, tech and startups, with a flat 20% rate on qualifying income. Most retirees and remote workers do not qualify. If someone sells you NHR in 2026, ask more questions.

A Simple Checklist for Your First Year

Living Here Is More Than Paperwork

The tax side is the least romantic part of moving to Portugal, and it is the part that rewards preparation the most. Get it set up properly in year one and it becomes a routine you deal with once a year, leaving the rest of the year for what you came for.

Part of that is the language. Accountants, banks and Finanças offices increasingly speak English, but not always, and knowing the Portuguese words for the things you deal with makes every appointment easier. Our European Portuguese course at Portugal Lifestyle takes you from your first words to A2, the level asked for permanent residence and citizenship, at your own pace.

This article is general information, not tax or legal advice. Thresholds and rules change every year. Always confirm your situation with a qualified US-Portugal tax professional.