US Foreign Tax Credit in Portugal: Form 1116 (2026)

If you’re a US citizen living in Portugal, you don’t get to pick one tax system. You’re in both: the US taxes you on citizenship (every American files a 1040 wherever they live), and Portugal taxes you on residence (once you’re resident, on your worldwide income). The thing that stops you paying twice on the same euro is the foreign-tax credit — but which return claims it, and in which order, trips up almost everyone the first year.

This guide is the map. It’s not a substitute for a cross-border CPA — US citizens genuinely need one — but it’ll stop you paying for one to explain the basics.

The core idea: credits flow in both directions

The US–Portugal treaty assigns each type of income a country with the primary right to tax it. The other country still taxes it (the US because of citizenship; Portugal because of residence) but gives a credit for the tax already paid to the primary country. Net effect: you pay roughly the higher of the two rates, once — not both rates stacked.

The hard part is that the direction of the credit depends on where the income is sourced:

Income	Primary taxing right	You credit on…
Portuguese salary / freelance income	Portugal (residence + source)	the US side (Form 1116)
US dividends, US interest	US (source)	the PT side (Anexo J, Quadro 10)
US pension / Social Security	US (per treaty)	the PT side
Capital gains on shares	usually Portugal (residence)	the US side

Get the direction wrong and you either double-pay or under-claim — both are corrigible, but painful.

The order of operations

FEIE vs FTC — why most PT residents use the credit

Americans abroad have two tools to avoid double tax on earned income: the Foreign Earned Income Exclusion (Form 2555, excludes roughly $130k of earned income in 2026) and the Foreign Tax Credit (Form 1116).

For Portugal specifically, the FTC usually wins:

• Portuguese IRS rates are high (progressive up to 48%). They almost always exceed the US tax on the same income, so the FTC fully offsets your US liability on PT-source income — often leaving excess credits to carry forward.
• The FEIE only covers earned income and, once you elect it, locks you out of cleanly using the FTC on that income. It also doesn’t help with investment income at all.

The re-sourcing trap

Here’s the genuinely tricky one. Some income is US-source (e.g. US dividends) but Portugal also taxes it because you’re resident. On your US return, you can’t normally claim a foreign-tax credit for foreign tax paid on US-source income — the FTC is for foreign-source income.

The treaty fixes this with a re-sourcing rule: it lets you treat certain US-source income as foreign-source for FTC purposes, so the Portuguese tax becomes creditable on your 1040. On Form 1116 this goes in a separate “re-sourced by treaty” category, and it requires disclosing the treaty position (Form 8833).

This is where DIY breaks down. If you have US-source investment income that Portugal also taxes, get a cross-border CPA — the re-sourcing election is worth real money and is easy to miss.

Worked example

US citizen, PT resident. €60,000 PT freelance income, plus $2,000 in US dividends (€1,850).

• PT side: freelance income taxed under PT standard regime; the US dividends go on Anexo J with the 15% US withholding (€278) credited on Quadro 10.
• US side: the $2,000 dividends are US-taxable; the €60k PT income is reported but the Portuguese tax on it is credited via Form 1116, which (because PT rates are higher) fully covers the US tax on that slice — likely with carryforward left over.
• Net result: you pay PT’s (higher) rate on the work income and PT’s rate on the dividends after the US-withholding credit. No euro is taxed twice. Extra US cash tax owed is often $0 thanks to the FTC.

The numbers are illustrative — your actual position depends on the FEIE/FTC choice, state filing, and the re-sourcing election. Run the PT side in the calculator to see your Portuguese liability, then hand it to your CPA for the US return.

Don’t forget the information returns

Tax credits aside, US citizens have reporting duties that have nothing to do with how much you owe:

• FBAR (FinCEN 114) — if your foreign accounts total over $10,000 at any point in the year. Penalties for missing it are severe and unrelated to tax owed.
• Form 8938 (FATCA) — if foreign financial assets exceed the (higher) thresholds for residents abroad.

Portugal exchanges account data with the US under FATCA, so AT and the IRS both tend to know about your accounts already. File the forms.

When to hire (for Americans: basically always)

DIY works for a simple PT filer. It does not work well for a US citizen — the FEIE/FTC choice, the re-sourcing election, state-tax tails, and PFIC rules on non-US funds all carry real money and real penalties.

The standard setup: an OCC-certified contabilista on the Portuguese side (who can legally file your Modelo 3) and a US-licensed cross-border CPA on the US side, coordinating once a year. Budget for both; it pays for itself the first time the re-sourcing or PFIC question comes up.

Sources

• IRS — Foreign Tax Credit (Form 1116)
• IRS — Foreign Earned Income Exclusion (Form 2555)
• IRS — Report of Foreign Bank and Financial Accounts (FBAR)
• Foreign-Source Income on Anexo J
• Selling foreign shares — capital gains on Anexo J Quadro 8