Do You Have to File a US Tax Return if You Live in the UK?
Living in the UK as an American? Learn who must file US taxes from the UK, key deadlines, forms and how to avoid paying twice.
US citizens and green card holders usually have to file a US tax return every year while living in the UK.
Most Americans in the UK must file a US tax return every year, even when they owe no US tax. That is because filing and paying are two different things. UK tax is often higher than US tax, so reliefs can wipe out your US bill, but you still have to file to claim them.
Key Takeaways
- You usually must file. US citizens and green card holders file a US return while living in the UK, because the US taxes income from anywhere in the world.
- Filing is not paying. Many filers owe $0 after claiming relief for UK tax already paid, but the return is how you claim it.
- US tax reliefs can cut the bill. Credit for UK tax paid, an exclusion for foreign wages, housing costs and a child credit all help. The US–UK tax treaty does not end your duty to file.
- UK income goes on the return in US dollars. Salary, savings interest, dividends, pensions and rent all count. The US year (1 Jan–31 Dec) does not match the UK year (6 Apr–5 Apr).
- Some forms are extra. Everyone files Form 1040. Reports of foreign accounts and assets apply depending on what you hold.
- Deadlines are 15 April, 15 June and 15 October. Americans abroad get an automatic extension to 15 June and can ask for 15 October. Tax you owe is still due on 15 April.
- Missed years can be fixed. Penalties can apply even when you owe no tax, but a streamlined route run by the IRS can remove them for people who missed filing by mistake.
Who Has to File a US Tax Return While Living in the UK?
A US citizen or green card holder must file a US return while living in the UK if their worldwide income is above the US filing threshold.
US citizens are covered however they obtained citizenship: by birth in the US, by birth abroad to a US-citizen parent, or by becoming a citizen later in life.
Green card holders are treated like citizens for filing purposes for as long as the card has not been formally surrendered or revoked.
Holding a British passport alongside a US one does not reduce the obligation, because the IRS looks only at US citizenship.
Do Green Card Holders Living in the UK Have to File?
Yes, because a green card holder is a US tax resident and must file like a US citizen, reporting worldwide income. That duty continues until the green card is formally given up. Moving to the UK or letting the card expire does not end it.
What Is the US Filing Threshold for Your Filing Status?
| Filing Status | Who It Is For | Under 65 | 65 or Older |
|---|---|---|---|
| Single | Unmarried, and no other status applies | $15,750 | $17,750 |
| Married Filing Jointly | A married couple filing one return | $31,500 | $33,100 (one) / $34,700 (both) |
| Married Filing Separately | A married person filing their own return | $5 | $5 |
| Head of Household | Unmarried or treated as unmarried, paying more than half the cost of a home shared with a qualifying child or relative | $23,625 | $25,625 |
Source: IRS Publication 501 (2025), Table 1.
The Married Filing Separately threshold is only $5. Five dollars of gross income is enough to require a return. This catches many Americans married to a British spouse.
If your spouse is not American, you can choose to file jointly by treating them as a US resident, which changes your threshold and rates.
Does Being Self-Employed Change When You Must File?
Yes. Net earnings from self-employment of $400 or more mean you must file a US return, whatever your filing status or total income. Profit from a business you run in the UK counts.
| Test | What It Measures | Triggers a Return At |
|---|---|---|
| Standard threshold | Gross income from all sources | The figure for your filing status |
| Self-employment test | Net earnings from self-employment | $400 |
You must file if either test is met.
What Happens If You Do Not File?
| Penalty or Fix | When It Applies | What It Costs or Does |
|---|---|---|
| Late filing penalty | You owe tax and file late | 5% of the unpaid tax for each month, up to 25% |
| Late payment penalty | You owe tax and pay late | 0.5% of the unpaid tax a month |
| Interest | Any tax stays unpaid after the due date | Charged on top of the penalties |
| Foreign account report penalties | You do not file FBAR or Form 8938, even when you owe nothing | $10,000 or more |
| Streamlined Filing Compliance Procedures | You have missed years and live abroad | Can often remove these penalties when the failure was not deliberate |
What UK Income Goes on Your US Return?
Almost all of it. UK income goes on your US return unless a US rule or the US–UK tax treaty exempts it.
| UK Income | What Goes on Your US Return | What to Watch |
|---|---|---|
| UK salary | Gross pay in US dollars, reported as wages | A P60 covers 6 Apr–5 Apr. The US year runs 1 Jan–31 Dec, so add up payslips for each calendar year |
| UK savings interest | Interest income in US dollars | The UK personal savings allowance does not apply on the US return |
| UK dividends | Dividend income in US dollars | The UK dividend allowance does not apply. Higher earners may also owe the 3.8% net investment income tax |
| ISA income | Interest and dividends inside the ISA | ISAs are not tax-free for US purposes. Many UK funds count as PFICs and need Form 8621 |
| UK pension income | Pension payments as pension income | The US–UK treaty may exempt or reduce some private pension income. A pension pot may also need FBAR reporting |
| UK rent | Net rental profit on Schedule E | The US works out profit differently (e.g. depreciation, mortgage interest treatment) |
| Benefits in kind | Generally counted as extra pay at their value | Some perks such as employer-paid health insurance may be excluded |
| State benefits | Check each benefit separately | HMRC and the IRS apply different tax-free rules to each benefit |
What Does the US–UK Tax Treaty Do?
The treaty decides which country has the right to tax each type of income. However, its saving clause lets the US keep taxing US citizens living in the UK on their worldwide income, regardless of which country the treaty otherwise assigns that income to.
How Does the Totalization Agreement Stop Double Social Security?
A separate totalization agreement stops you paying both US Social Security tax and UK National Insurance on the same pay. Under the agreement’s detached-worker rule, a US employee sent to work in the UK for an expected period of five years or less stays in the US Social Security system instead of paying UK National Insurance. To claim this exemption, the employee needs a certificate of coverage from the US Social Security Administration.
What Tax Reliefs Can Americans in the UK Use?
Four main reliefs can reduce a US bill: the exclusion, the credit, the housing exclusion and the child tax credit.
Foreign Earned Income Exclusion (FEIE)
It lets you leave part of your foreign pay out of US income, up to $130,000 for 2025. You must pass the bona fide residence test or the physical presence test, and you claim it on Form 2555. It covers earned income (pay from work), so it does not cover rent, interest or dividends.
Foreign Tax Credit (FTC)
It reduces your US tax by the UK income tax you have already paid on the same income. You claim it on Form 1116, and many UK-based filers find it more useful than the exclusion because UK rates are often higher than US rates. It can also apply to income the exclusion does not cover, such as UK rent.
Foreign Housing Exclusion
It lets employees leave part of their housing costs abroad, such as rent and utilities, out of US income, on top of the FEIE. Self-employed people claim a deduction instead. You claim it on Form 2555 and must meet the same residence tests as the FEIE.
Child Tax Credit
It cuts your US tax by up to $2,200 for each qualifying child under 17 for 2025, and up to $1,700 per child can be refunded if you owe nothing. Your child needs a valid Social Security number, and you claim the credit on Schedule 8812. When you use the FEIE, you lose the refundable part on the income you exclude, so the FTC can protect it.
Neither the FEIE nor the FTC generally offsets the 3.8% net investment income tax on UK investment income, so high earners should budget for it separately.
Which Forms Will You File from the UK?
Everyone files Form 1040, and up to six more may apply depending on your situation.
| Form | What It Is | When You File It |
|---|---|---|
| Form 1040 | The main US income tax return | Always |
| Form 2555 or Form 1116 | Relief from double tax (exclusion or credit) | When you claim that relief |
| Schedule B | Interest and dividends; asks about foreign accounts | When you have foreign accounts |
| FBAR (FinCEN Form 114) | Report listing your overseas accounts, sent to FinCEN | When your foreign accounts together pass $10,000 |
| Form 8938 | Statement of foreign financial assets, filed with your return | When your foreign assets pass the FATCA thresholds |
| Form 8833 | Treaty-based return position disclosure | Only if a treaty position needs disclosing |
| Form 8621 | Report of any PFIC you own (many UK funds qualify) | Only if you hold UK funds that qualify |
What Are the US Tax Deadlines for Americans in the UK?
Filing US taxes from the UK gives you extra time: the usual deadline is 15 April, but Americans who live in the UK automatically get until 15 June to file and can ask for more time until 15 October. Tax you owe is still due on 15 April.
| Deadline | Date | What It Means |
|---|---|---|
| Normal deadline | 15 April 2026 | Your return is due, and any US tax you owe must be paid |
| Automatic two-month extension | 15 June 2026 | Applies if you live and work outside the US on 15 April. No application needed, but interest runs from 15 April |
| October extension | 15 October 2026 | Apply by 15 June using Form 4868. Extends filing date, not payment date |
| FBAR deadline | 15 April 2026, auto-extended to 15 October 2026 | The separate report of your overseas accounts. No extension request needed |
How Do You File Your US Tax Return from the UK?
Online or by post, and both routes work. Online filing is quicker, and the software confirms when the IRS accepts your return.
Online filing has four hurdles for people abroad:
- Foreign address problems — some software rejects a UK address or postcode format.
- No US phone number — some services ask for a US mobile number to create an account.
- ID.me identity checks — text-message codes sent to a US number often fail from abroad, so choose app-based verification.
- Signing from abroad — an e-filed return is signed with a five-digit PIN, your date of birth, and either last year’s AGI or last year’s PIN.
Filing by Post: IRS Addresses
| Your Situation | Where to Post Your Return |
|---|---|
| No payment due | Department of the Treasury, Internal Revenue Service, Austin, TX 73301-0215, USA |
| Payment enclosed | Internal Revenue Service, P.O. Box 1303, Charlotte, NC 28201-1303, USA |
Currency and Tax Year
Convert every pound amount using a reasonable exchange rate, because the return must be in US dollars. The IRS accepts a rate such as a yearly average that it publishes. Whichever method you choose, apply it the same way across the whole return.
The UK tax year runs from 6 April to 5 April, but the US tax year is the calendar year, 1 January to 31 December. Sort your UK income by the month you earned it, then total it by US calendar year.
How Does Your First US Return Work After Moving to the UK?
Your first year of filing US taxes from the UK covers the whole calendar year, which you split into months in the US and months in the UK.
Income you earned in the US before the move stays on the return in the normal way. Pay you earned in the UK after the move may qualify for the Foreign Earned Income Exclusion, but only for the days you qualified, so in a part year the exclusion is reduced.
In your first year you may not have passed either the bona fide residence test or the physical presence test by the filing deadline. You can then wait — Form 2350 usually extends the time to file to 30 days after the date you reasonably expect to qualify.
Keep a day-count log from the day you arrive. Record each full day in the UK and each day outside it, because the physical presence test is counted in days. Passport stamps, flight itineraries and hotel receipts support the log.
Do You Still Owe US State Tax After Moving to the UK?
Possibly, depending on the state you left. Most states stop taxing you once you move abroad, but a few “sticky” states, such as California, New Mexico, South Carolina and Virginia, can keep taxing you as a resident. They look at your domicile, and ties there such as a home, driving licence, voter registration or bank accounts can keep it in place.
Frequently Asked Questions
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