US tax forms for expats explained (2026 update)
Most US expats filing for tax year 2025 start with Form 1040, then add Form 2555 if they are claiming the foreign earned income exclusion, Form 1116 if they are claiming the foreign tax credit, and FBAR and/or Form 8938 if they meet the separate reporting thresholds.
The US generally taxes US citizens and resident aliens on worldwide income, so the obligation follows you abroad regardless of where you live – which specific forms you need depends on your income type, account balances, and whether you own interests in foreign entities.
In this article, you'll find the most common tax forms for US citizens living abroad and what triggers each one, current 2025 exclusion limits and thresholds with confirmed 2026 figures, exact deadlines for the 2026 filing season, and the mistakes that most often lead to penalties.
What are the US tax forms for expats abroad?
Not every expat files every form – the expat tax forms that apply to you depend on your income type, foreign asset values, account balances, entity ownership, and whether you claim a credit or exclusion.
The table below covers the most common IRS tax forms for expats, along with who files each one, what triggers the requirement, and where it is filed.
Most expats who live abroad and earn foreign income will file Form 1040 alongside at least one of the forms below: FBAR and Form 8938 are separate obligations triggered by account and asset thresholds.
| Form | Who files | Main trigger | Filed with | Due date |
|---|---|---|---|---|
| Form 1040 | US citizens and resident aliens | Income above filing threshold (based on status and age) | IRS | April 15 – June 15 (automatic expat extension) |
| Form 2555 | Expats with foreign earned income | Foreign wages or self-employment income FEIE: $130,000 (2025) |
Attached to Form 1040 | Same as Form 1040 |
| Form 1116 | Taxpayers paying foreign income tax | Foreign tax paid or accrued on foreign-source income | Attached to Form 1040 | Same as Form 1040 |
| Form 8938 | Expats with foreign financial assets | $200,000+ (single abroad) $400,000+ (MFJ) |
Attached to Form 1040 | Same as Form 1040 |
| FBAR (FinCEN Form 114) |
US persons with foreign accounts | $10,000+ aggregate across all accounts | FinCEN (not IRS) | April 15 – October 15 (automatic extension) |
| Form 4868 | Any taxpayer needing more time | Filed to extend beyond June 15 | IRS | File by June 15, 2026 – extends to October 15 |
| Form 5471 | Owners of foreign corporations | Ownership or control of a foreign corporation | Attached to Form 1040 | Same as Form 1040 |
Which expat tax forms apply to you?
Your filing obligations depend on where your income comes from, what you own abroad, and whether you hold any foreign accounts or business interests. Not every expat files every form – the set of forms you need is determined by your specific situation, not by the fact of living overseas.
You live abroad and earn income
Form 1040 is the baseline for every US citizen or resident alien who meets the income threshold. For tax year 2025, a single filer under 65 generally must file once gross income reaches $15,750. Living abroad does not replace this obligation – it follows citizenship, not location.
You earn a foreign salary or run a business abroad
For a US citizen working abroad, the tax form for earned income is either Form 2555 or Form 1116. Form 2555 lets you claim the overseas tax exemption known as the Foreign Earned Income Exclusion (FEIE) of $130,000 for tax year 2025.
Form 1116 lets you claim a foreign tax credit for qualified foreign taxes paid – in many high-tax countries, it can be the better fit, but the right choice depends on your income type, the foreign taxes paid, and whether FEIE would work better that year.
You hold foreign bank or financial accounts
If the aggregate value of all your foreign accounts exceeded $10,000 at any point in 2025, you must file FinCEN Form 114 (FBAR). This is a separate obligation from your tax return, filed through the FinCEN BSA e-Filing system – not with the IRS.
The threshold is aggregate, meaning a checking account with $6,000 and a savings account with $5,000 together cross it.
You hold significant foreign assets
Form 8938 covers a broader range of specified foreign financial assets, with thresholds starting at $200,000 for single filers abroad at year-end. Many expats who file FBAR also need Form 8938 – the two cover different things and are not interchangeable.
You own a foreign corporation, partnership, or fund
Form 5471, Form 8865, and Form 8621 each cover a different type of foreign business or investment interest. These are among the most commonly missed IRS expat tax forms – Forms 5471 and 8865 carry starting penalties of $10,000 per form, while Form 8621 follows separate PFIC rules, and missing it can suspend the assessment period under section 6501(c)(8).
The table below maps the most common tax forms for US citizens living abroad to the situation that triggers each one – use it as a quick reference alongside the triggers above.
| Your situation | Form to file |
|---|---|
| US citizen or resident alien meeting income threshold | Form 1040 |
| Foreign earned income; low- or no-tax country | Form 2555 (FEIE) |
| Foreign earned income; high-tax country | Form 1116 (FTC) |
| Foreign accounts exceeding $10,000 aggregate | FinCEN Form 114 (FBAR) |
| Foreign assets exceeding $200,000 (single, abroad) | Form 8938 |
| Ownership in a foreign corporation | Form 5471 |
| Interest in a foreign partnership | Form 8865 |
| Holdings in a foreign mutual fund or ETF | Form 8621 |
Form 1040: your annual US tax return
Form 1040 is the main tax return most US citizens working abroad file – and the first tax form every expat needs before adding any attachments.
Who files
US citizens and resident aliens with gross income above the applicable threshold must file Form 1040. The requirement depends on filing status, age, and special situations – it is not automatic for every citizen regardless of income.
What income counts
Worldwide income reporting applies regardless of where it is earned – wages, self-employment income, dividends, rental income, and capital gains all count.
The IRS taxes US citizens on global income, not just income sourced inside the US. For tax year 2025, the standard deduction is $15,750 for single filers, $31,500 for those married filing jointly, and $23,625 for head of household.
Deadline
Qualifying taxpayers abroad generally have until June 15, 2026, to file under the automatic 2-month extension, and may request an additional filing extension to October 15, 2026, with Form 4868. However, interest on unpaid tax generally starts running from April 15, 2026.
Common attachments
Most expats attach at least one of the following to their Form 1040:
- Form 2555 to claim the FEIE.
- Form 1116 to claim the foreign tax credit.
- Form 8938 if foreign asset thresholds are met.
- Schedules for any foreign business or investment interests.
Form 2555 and foreign income exclusion
Form 2555 is the IRS form used to claim the Foreign Earned Income Exclusion (FEIE), one of the most valuable tools available on any tax form for US citizens living abroad. For tax year 2025, the exclusion limit is $130,000 per qualifying taxpayer, rising to $132,900 for 2026.
Who qualifies
To qualify, a taxpayer must have a foreign tax home and meet one of two tests:
- The physical presence test requires 330 full days in a foreign country within any 12-month period.
- The bona fide residence test requires continuous residence in a foreign country for an entire tax year, judged by lifestyle, intent, and ties abroad.
What income counts
Wages and self-employment income earned abroad qualify for the exclusion. If you are unsure of your exact exclusion amount, use the FEIE calculator.
What income does not count
Dividends, capital gains, rental income, and other passive income do not qualify. The exclusion applies strictly to income earned through active work.
When FEIE is not the best choice
If you live in a high-tax country where the local tax rate exceeds the US rate, Form 1116 and the foreign tax credit will likely reduce your US bill further. Many expats calculate both options before choosing.
NOTE! Many taxpayers combine FEIE with the foreign housing exclusion for added savings. For 2025, the housing base is $20,800 with a standard cap of $39,000. For 2026, the base increases to $21,264 with a cap of $39,870, using the IRS's 16% and 30% formulas.
Form 1116: your guide to claiming the foreign tax credit (FTC)
Form 1116 is the IRS form used to claim the foreign tax credit for qualified foreign income taxes, subject to the FTC limitation – the credit is capped at the lesser of the foreign tax paid or the US tax attributable to your foreign-source income.
It is particularly valuable for expats in high-tax countries like Germany, France, or Japan, where local rates often exceed the US rate.
FEIE vs FTC: which works better for you?
For most expats in low-tax countries, the overseas tax exemption through FEIE ($130,000 for 2025) eliminates US tax entirely; FTC is the better choice when foreign taxes paid exceed the US rate on the same income, or when income types fall outside what FEIE can exclude.
| FEIE (Form 2555) | FTC (Form 1116) | |
|---|---|---|
| Best for | Low-tax countries, self-employed expats | High-tax countries (Germany, France, Japan) |
| What it covers | Earned income only (wages, self-employment) | Most foreign income types on which tax was paid |
| 2025 limit | $130,000 exclusion per person | Credit for foreign taxes paid, subject to FTC limitation |
| Carryover | None | Unused credits carry back one year, forward 10 |
| Can you combine? | Yes, with the housing exclusion | Yes, with FEIE on different income categories |
Based on a TFX client scenario: a US consultant in the UAE claimed the 2025 FEIE ($130,000), reducing federal tax liability to $0. A comparable client in Germany, where income tax rates can exceed 40%, used FTC instead – the credit offset the full US liability with credits left to carry forward. For 2026, the FEIE rises to $132,900.
The IRS carryover rules let unused credits roll back one year and forward for 10, which is valuable when foreign tax payments vary between years.
Form 8938 (FATCA) vs FBAR: key differences
Many expats need to file both Form 8938 and FinCEN Form 114 – they cover different assets, different thresholds, and are submitted to different agencies. Knowing how they differ keeps your filing complete and avoids penalties that run into the tens of thousands.
Form 8938 covers specified foreign financial assets and is filed with your Form 1040; FinCEN Form 114 (FBAR) covers foreign financial accounts and is filed separately through the FinCEN BSA e-Filing system, not with the IRS.
| Form 8938 | FinCEN Form 114 (FBAR) | |
|---|---|---|
| Who files | Individuals and domestic entities with specified foreign assets | US persons with financial interest in or authority over foreign financial accounts |
| Trigger | Foreign assets above reporting threshold | Aggregate value of all foreign accounts exceeded $10,000 at any point in the year |
| Reporting thresholds | Single/MFS abroad: over $200,000 at year-end or $300,000 at any point; MFJ: over $400,000 at year-end or $600,000 at any point | $10,000 aggregate across all accounts at any single point in the year |
| What it covers | Stocks, trusts, and ownership interests in foreign entities | Bank, brokerage, pension, and insurance accounts at foreign financial institutions |
| Where to file | Attached to Form 1040 | FinCEN BSA e-Filing system (not the IRS) |
| Due date | Same as Form 1040; automatic June 15 extension for expats, up to October 15 with Form 4868 | April 15, with an automatic extension to October 15 under its own rule (no form required) |
| Penalties | Up to $10,000 for failure to file, rising to $50,000 after IRS notice; 40% accuracy penalty on related underpayments | Non-willful: up to $16,536 per violation; willful: the greater of $165,353 or 50% of the account balance (31 U.S.C. § 5321, FinCEN.gov) |
| Typical examples | Foreign brokerage accounts, ownership stakes in foreign companies, foreign trusts | Foreign checking, savings, or investment accounts held at a non-US bank |
Forms 5471, 8865, 8621, and 8858: reporting businesses and investments abroad
Knowing which IRS tax forms for US citizens living abroad apply to foreign ownership is where most expats fall short – each of these four forms targets a different structure.
Form 5471: foreign corporations
What triggers it: Ownership or control of a foreign corporation, including anyone who owns more than 50% of a controlled foreign corporation (CFC).
Who commonly misses it: Expats who set up a local company abroad – a UK Ltd, a German GmbH – without realizing the form attaches to their individual return.
Why it matters: Penalties start at $10,000 and rise by $10,000 every 30 days after IRS notice, up to $50,000. Not filing keeps the statute of limitations open indefinitely.
Form 8865: foreign partnerships
What triggers it: Control, major ownership, or property transfers in a foreign partnership, with Schedules K-2 and K-3 required for international detail.
Who commonly misses it: Expats who enter a business partnership abroad and treat it like a domestic arrangement.
Why it matters: Penalties mirror Form 5471, with possible foreign tax credit reductions on top.
Form 8621: passive foreign investment companies (PFICs)
What triggers it: Form 8621 may be required when a US person holds a direct or indirect interest in a PFIC, including many foreign mutual funds and ETFs – the filing requirement can apply across a range of situations outlined in the IRS instructions, not only on distributions or sales.
Who commonly misses it: Expats who invest in local funds abroad – an ISA in the UK, a local index fund in Germany – without recognizing them as PFICs under US rules.
Why it matters: Form 8621 follows separate PFIC reporting rules – missing a required filing can keep the tax year open under section 6501(c)(8) until the form is received. A QEF or mark-to-market election can reduce the burden significantly, but only if made on time.
Form 8858: foreign disregarded entities and branches
What triggers it: Ownership of a foreign disregarded entity or foreign branch, including single-member LLCs organized abroad.
Who commonly misses it: Expats with simple-looking foreign structures who do not recognize their entity as a disregarded entity under US tax rules.
Why it matters: One of the least-known overseas tax forms in the expat filing system. Penalties start at $10,000 per entity per year.
How to file US tax forms for expats
Filing tax forms for US citizens living abroad follows four clear steps, and the exact dates for the 2026 filing season (covering tax year 2025) are fixed.
Step 1: Mark your exact 2026 deadlines
The regular due date for tax year 2025 returns is April 15, 2026. Expats living abroad receive an automatic two-month extension to June 15, 2026 – no form required. To extend beyond that to October 15, 2026, file Form 4868 by June 15, 2026. A discretionary additional extension to December 15, 2026, can be requested by letter, but that extra extension is not automatic.
Payment of any tax due is generally not extended beyond June 15, 2026, for qualifying expats – interest applies from that date on any unpaid balance.
Step 2: Gather your documentation
Collect all records of foreign income – wages, self-employment income, foreign bank statements, and brokerage records. Decide which IRS tax forms for US citizens living abroad apply to your situation before you begin.
Step 3: Convert and classify
Use a posted exchange rate consistently, but follow the rule for each form and item – some amounts use the rate on the date received or paid, while others may allow an annual average. Sort income and taxes by category before calculating credits or exclusions.
Step 4: File and pay
You can file from abroad by e-file or mail and pay electronically from most banks. To extend filing to October 15, 2026, file Form 4868 by June 15, 2026 – this does not extend payment of any tax due. Double-check addresses, bank details, and any FEIE or FTC schedules before submitting.
Also read. US tax deadlines and extensions 2026
Common mistakes with expat tax forms
The most costly errors in expat filing are not math errors – they are structural ones, and the seven mistakes below are among the most common expat filing errors TFX sees each filing season.
- Assuming Form 1040 is the only form needed. Most expats need at least one additional form, and anyone with foreign accounts above $10,000 needs FBAR on top of that.
- Confusing FBAR with Form 8938. They cover different things, and filing one does not satisfy the obligation for the other. Many expats need both.
- Treating FBAR as an IRS form. FinCEN Form 114 is filed through the FinCEN BSA e-Filing system – not attached to your tax return and not sent to the IRS.
- Assuming FEIE removes the need to file. Even if the exclusion eliminates all US tax owed, a return is still required when income meets the filing threshold.
- Missing foreign business and investment reporting. Forms 5471, 8865, and 8858 carry penalties starting at $10,000 per form; Form 8621 follows separate PFIC rules and can suspend the assessment period under section 6501(c)(8).
- Using the wrong deadline logic. The June 15, 2026, extension moves the filing date – not the payment date. Tax owed is generally due by June 15, 2026, for qualifying expats.
- Forgetting that FBAR thresholds are aggregate. The $10,000 trigger applies to the combined value of all foreign accounts at any single point during the year – not the year-end balance of each account separately.
FAQs on tax forms for US citizens living abroad
Yes – US citizens and resident aliens must file a federal return when gross income meets the applicable threshold, regardless of where they live. The obligation follows citizenship, not location.
Most expats file Form 1040 as their base return, with Form 2555 or Form 1116 attached to address foreign income. If foreign accounts exceeded $10,000 at any point during tax year 2025, FinCEN Form 114 (FBAR) is also required.
Expats with significant foreign assets or ownership in foreign corporations, partnerships, or funds may also need Form 8938, Form 5471, Form 8865, or Form 8621.
Yes. A return is still required when your income meets the filing threshold. Benefits like the FEIE or foreign tax credit apply only if you file.
Yes. Taxes for Expats routinely prepares late and multi-year returns, including FBAR catch-up filings, with dedicated CPA support.
