Taxes for Americans in Portugal

You still file in the US — every year, forever

The United States is one of only two countries that taxes its citizens on worldwide income regardless of where they live. Moving to Portugal does not change that: as long as you hold a US passport or a green card, you must file an IRS Form 1040 every year reporting Portuguese salary, rental income, dividends, capital gains and crypto. The good news is that the US–Portugal tax treaty and US foreign-income relief tools usually mean you owe little or nothing extra to the IRS — but you still have to file.

How the US–Portugal tax treaty works

The 1994 treaty (revised 2017) assigns primary taxing rights to one country for each type of income, then forces the other country to credit tax already paid. In practice this means salary you earn while physically working in Portugal is taxed first by Portugal; US-source pensions and Social Security retirement payments are usually taxable only by the US under the treaty's saving clause carve-outs; and most investment income is taxable in your country of residence. The treaty does not eliminate filing — it just prevents you from being taxed twice on the same euro.

The two tools that prevent double taxation

On your US return you'll claim either the Foreign Tax Credit or the Foreign Earned Income Exclusion — almost never both on the same income. Pick the wrong one and you can leave thousands on the table.

• Foreign Tax Credit (Form 1116) — credits Portuguese income tax dollar-for-dollar against US tax on the same income. Best for high earners (Portuguese rates exceed US rates above ~€40k) and people with kids who want the Child Tax Credit refundable
• Foreign Earned Income Exclusion (Form 2555) — excludes the first ~$130,000 of earned income from US tax in 2026. Simpler, but kills the refundable Child Tax Credit and doesn't help with passive income
• Most expat-CPAs run both calculations and choose whichever produces less total tax over a 5-year window

FBAR and FATCA — the forms you cannot skip

Two non-tax informational forms catch out almost every American newcomer. Penalties for non-filing are absurd ($10,000+ per year per missed account), so set a calendar reminder for April every year.

• FBAR (FinCEN 114): file online if the combined high balance of your non-US accounts (every Portuguese bank account, Revolut PT IBAN, brokerage, even joint accounts you can sign on) crosses $10,000 at any point in the year. Free, takes 20 minutes
• FATCA (Form 8938): filed with your 1040 when foreign financial assets exceed $200,000 on 31 December (or $300,000 at any time) for single filers abroad — double for joint
• Portuguese banks already auto-report your account to the IRS under FATCA, so consistency between what they report and what you report matters

The PFIC trap — the costliest American mistake

Almost every non-US mutual fund and ETF is a Passive Foreign Investment Company (PFIC) under US tax law. PFICs are taxed punitively: gains are taxed at the highest US ordinary rate, plus an interest charge for every year held, with brutal Form 8621 reporting per fund per year. The accountant fees alone can dwarf the gain. The fix is simple: do not buy any Portuguese-listed mutual fund, Portuguese-domiciled ETF, or any UCITS ETF on Degiro/Trading 212 from your Portuguese brokerage. Hold US-domiciled ETFs (VTI, VXUS, BND) at a US broker (Schwab International, Interactive Brokers US, Fidelity expat desk) instead.

What about NHR, IFICI and the new Portuguese tax regimes

The classic NHR closed in 2024. Its successor IFICI (often called 'NHR 2.0') still gives a flat 20% rate on qualifying Portuguese activity income for 10 years, plus exemption on most foreign-source income. Crucially for Americans, IFICI does not exempt your US dividends, interest or capital gains from Portuguese tax automatically — the treaty rules apply, and you may owe Portugal tax on US passive income you used to think was 'covered'. Always run the numbers with a cross-border specialist before assuming IFICI saves you money.

Calendar — what's due when

Living in two tax systems means twice the deadlines. The most painful surprises come from forgetting one of them.

• 15 April: US 1040 due (automatic 2-month extension to 15 June for expats; further extension to 15 October on request)
• 15 April: FBAR due (automatic extension to 15 October — no form needed)
• Late March – end of June: Portuguese IRS filing window (exact dates set annually)
• 31 May: First instalment of Portuguese IRS payment if owed
• 30 September: Portuguese self-employed must declare Q3 SS income base

What it actually costs

Budget €600–€2,500/year for a competent dual-country tax preparer in your first 2–3 years; this can drop to €400–€1,000 once your situation stabilises. It feels like a lot until you compare it to the average IRS PFIC penalty assessment, which the AICPA estimates at $25,000+. Pay the accountant.