Do U.S. expats need to file a tax return? Almost always — here's when

Updated September 2026 · Covers 2025 returns (filed 2026) & 2026 planning · Sources: IRS Pub. 54, Rev. Proc. 2025-32, FBAR and Form 8938 instructions · Spot an error?

Last reviewed September 2026 by Ken Hoven against IRS Publication 54, the 2026 inflation-adjustment release, and the current FBAR and Form 8938 instructions. See editorial standards. Educational content only — not tax or legal advice.

Citizenship-based taxation, in one paragraph

The United States taxes its citizens and green card holders on their worldwide income, wherever they live. Almost every other country taxes people based on where they reside; the U.S. (and, in practice, Eritrea) taxes based on who you are. So moving to Lisbon, Dubai, or Hyderabad does not end your relationship with the IRS. It changes which forms you file and which exclusions and credits you can use to avoid paying tax twice — but the obligation to file follows the passport.

Filing thresholds for 2025 and 2026 returns

For most people the filing threshold equals the standard deduction. These are the figures from the IRS inflation adjustments; the 2025 amounts reflect the 2025 legislation that raised them mid-year.

Two of those rows do most of the damage for expats. Married filing separately at $5 is not a typo — if you're married to a non-U.S. citizen who has no U.S. filing obligation, you're typically filing as MFS (or head of household if you qualify), and the threshold is effectively zero. And $400 of self-employment income triggers a filing requirement on its own, even if all of it is excluded under the FEIE, because the FEIE excludes income tax but not self-employment tax.

"Gross income" for this test means your worldwide income before the FEIE. A $90,000 salary in Qatar that ends up fully excluded still counts as $90,000 for deciding whether you must file.

Owing zero is not the same as not filing

This is the sentence I'd put on a billboard. The Foreign Earned Income Exclusion — $130,000 for 2025, $132,900 for 2026 — is not automatic. You claim it by filing Form 2555 with a tax return. No return, no exclusion; in the IRS's records you simply have unreported income. The same goes for the Foreign Tax Credit: it's claimed on Form 1116, which only exists as part of a filed return.

So the typical expat outcome — file, claim FEIE or FTC, owe $0 — depends entirely on the filing. Skip it for a few years and you have not saved effort; you have created a catch-up project.

The other filings that don't depend on income

Two reporting requirements sit alongside the tax return and have their own triggers:

• FBAR (FinCEN Form 114). Required if the combined peak balance of all your foreign financial accounts exceeded $10,000 at any point in the year — every account added together, including ones you only have signature authority over. Filed separately with FinCEN, not with the IRS. Income is irrelevant; a student with $10,001 across two accounts for one day must file. Check whether you're over the line, then read the FBAR & FATCA guide.
• Form 8938 (FATCA). Filed with your return if your specified foreign financial assets exceed $200,000 at year-end or $300,000 at any time for a single filer living abroad ($400,000 / $600,000 married filing jointly). Higher thresholds than FBAR, broader asset definition. Form 8938 guide.

Foreign mutual funds, foreign pensions, and ownership in foreign companies can add further forms (8621, 3520, 5471). Those are specialist territory, and this guide won't pretend otherwise.

Deadlines for Americans abroad

• April 15 — the regular deadline, and the date interest starts running on any balance due, extension or not.
• June 15 — automatic two-month extension for taxpayers living and working outside the U.S. No form needed; attach a statement to the return saying you qualify.
• October 15 — if you file Form 4868 by June 15.
• December 15 — a further discretionary extension, requested by letter, that the IRS may grant.
• FBAR: April 15, with an automatic extension to October 15.

Full detail, including estimated-payment dates for the self-employed, is in the deadlines guide and the deadline calendar.

What happens if you don't file

If you owe tax, the failure-to-file penalty is 5% of the unpaid tax per month, up to 25%, plus a failure-to-pay penalty and interest. If you owe nothing — which is common for expats using the FEIE — there is no failure-to-file penalty on the return itself. That's where people relax too early.

The information returns carry their own penalties regardless of tax owed: $10,000 for a missing Form 8938 (rising if you ignore an IRS notice), and FBAR penalties that start in the low five figures per non-willful violation and become severe if the IRS decides the failure was willful. Those are the numbers that turn "I didn't think I had to file" into an expensive problem.

Haven't filed in years? The path back

If you're behind and it was an honest mistake, the IRS has a formal catch-up route: the Streamlined Foreign Offshore Procedures. You file the last three years of returns and six years of FBARs, sign a statement (Form 14653) certifying the failure was non-willful, pay any tax and interest — and the failure-to-file, failure-to-pay, information-return, and FBAR penalties are waived. To qualify you must have been outside the U.S. for at least 330 full days in one of the three years and not maintained a U.S. abode.

Two things to know before you start: the IRS can end the program at any time, and it's closed to anyone already under examination. The checklist covers what to gather; the cost tool covers what it runs DIY versus with a firm.

Green card holders

Everything above applies to lawful permanent residents, not only citizens. A green card holder living abroad is a U.S. tax resident until the card is formally abandoned or revoked — leaving the country does not end the obligation, and an expired card doesn't either. Green card holders abroad covers the specifics, including the exit-tax question for long-term residents.

State taxes

Federal filing is only half of it. Whether you owe a state return depends on your domicile before you left and whether you severed it. Some states — California, Virginia, New Mexico, and South Carolina are the usual examples — are known for treating departing residents as still domiciled unless they can show they've established a permanent home elsewhere. If you left from one of those, look at that question before your first expat return, not after.

Frequently asked questions

Do I have to file U.S. taxes if I live abroad and pay tax in my new country?

Yes, if your worldwide gross income is above the filing threshold for your status. Paying foreign tax does not remove the U.S. filing requirement; it gives you the Foreign Tax Credit, which you claim on Form 1116 as part of a filed return. Many expats in high-tax countries file every year and owe nothing.

Do I have to file if all my income is excluded by the FEIE?

Yes. The exclusion is claimed on Form 2555 with a return; it is not applied automatically. The filing threshold is measured on gross income before the exclusion, so a salary above the standard deduction requires a return even if the FEIE brings the tax to zero.

I'm married to a non-American. What's my filing status and threshold?

Usually married filing separately, unless you qualify for head of household or elect to treat your spouse as a U.S. resident and file jointly. The married-filing-separately threshold is $5, so in practice any income means you file. The guide on being married to a non-U.S. spouse walks through the election and its consequences.

Do I need to file an FBAR if I don't owe any tax?

The FBAR has nothing to do with income or tax owed. It's required when the combined highest balances of your foreign financial accounts exceed $10,000 at any point in the year. It's filed separately with FinCEN and carries its own penalties.

What if I haven't filed for five years?

If the failure was non-willful and you meet the non-residency test, the Streamlined Foreign Offshore Procedures let you catch up with three years of returns and six years of FBARs, penalty-free apart from tax and interest. Older years beyond the three are not required under the program. Start with the streamlined guide and checklist.