Do American Citizens in the UK Need to File U.S. Taxes?

Do American Citizens in the UK Need to File U.S. Taxes?

In almost all cases: yes. The United States taxes by citizenship, not by where you live. Moving to Britain — however permanently, however settled your life becomes here — does not remove your obligation to file a U.S. tax return once your worldwide income exceeds the IRS filing thresholds.

This surprises many Americans in the UK. PAYE makes employment income feel resolved before it reaches your account. But for the IRS, UK income is still your income. The filing requirement exists not only to collect tax but to maintain an annual record of worldwide income and the reliefs that prevent double taxation. In many years you will owe nothing to the IRS — but the return is how that zero balance is formally established.

What Income Triggers a U.S. Filing Requirement?

You are generally required to file when your worldwide gross income exceeds the threshold for your filing status. For the 2025 tax year (the return filed in 2026), these are:

Green card holders are subject to exactly the same rules as U.S. citizens. The obligation continues regardless of how many years you have lived abroad or how fully you pay UK taxes.

What Counts as Income for Americans Living in Britain?

The IRS definition of income is broad and includes everything you receive from worldwide sources. For Americans in the UK this means:

• Salary and bonuses paid by a UK employer — taxed by PAYE, but still reportable in the U.S. return, converted to dollars at the applicable exchange rate
• Self-employment income from UK or international clients
• UK bank interest — even small amounts from savings accounts count toward your gross income for filing purposes
• Dividends from UK or international investments
• Rental income if you own property in the UK or elsewhere
• Capital gains from selling shares, property, or other assets — the UK and U.S. may calculate gains differently, and exchange rate movements add another layer
• ISA income — interest and gains inside an ISA are not recognised as tax-free by the IRS and remain fully reportable

Note that income earned in pounds must be reported in dollars. Most salary earners use the annual average Treasury exchange rate for regular income and the spot rate on the date of a specific transaction for one-off events.

U.S. Tax Deadlines for Americans Abroad — 2026

Americans living outside the United States receive additional filing time. For the 2025 tax year, the key dates are:

• 15 April 2026 — standard U.S. filing deadline (also the payment deadline if tax is owed)
• 15 June 2026 — automatic extension for Americans living abroad (no request required)
• 15 October 2026 — further extension available on request via Form 4868. This extends the filing deadline only — any tax owed should still be paid by 15 June to avoid interest charges
• 15 April / 15 October — FBAR deadline follows the same pattern (see below)

The extended overseas timeline is practically useful because the UK tax year ends in April: your P60 and bank interest statements will not be available until after the standard U.S. filing deadline, so the June extension prevents you from filing on incomplete information.

If I File, Will I Actually Owe U.S. Tax?

For most Americans earning a standard salary in the UK: probably not. UK income tax rates at the basic and higher rate bands are at least comparable to — and often higher than — U.S. federal rates at equivalent income levels. Two mechanisms are designed to prevent double taxation.

The Foreign Earned Income Exclusion (FEIE) allows you to exclude up to $130,000 of foreign earned income (salary, wages, self-employment income) from U.S. taxable income for 2025, rising to $132,900 for 2026. The Foreign Tax Credit (FTC, Form 1116) credits income tax already paid to HMRC against your U.S. tax liability, dollar-for-dollar.

In practice, for a typical UK-based employee fully taxed under PAYE, either of these reliefs — or a combination — generally reduces U.S. tax owed to zero. The FTC is usually preferable for higher earners, those with unearned income (interest, dividends), or those with pension planning considerations. The FEIE can be simpler for straightforward employment situations with income well within the exclusion limit.

FBAR and FATCA: Reporting UK Bank Accounts

Beyond the income tax return, two separate reporting obligations apply to most Americans in the UK. Neither is a tax — both are disclosure requirements, and both carry significant penalties for non-compliance.

FBAR — FinCEN Form 114

If the combined value of all your foreign financial accounts exceeded $10,000 at any point during the year — even for a single day — you must file an FBAR. The $10,000 threshold applies to the aggregate of all your accounts, not each account individually. A current account at £4,000 and a savings account at £4,000 on the same day could trigger the requirement if their combined dollar equivalent crosses the threshold.

For most Americans in Britain with a current account, savings account, and perhaps a joint household account, this threshold is crossed easily. The FBAR is filed electronically through FinCEN's BSA E-Filing system — not with the IRS — by 15 April with an automatic extension to 15 October. Accounts where you have signatory authority (such as an employer account) also count.

FATCA — Form 8938

Form 8938 is filed with your IRS tax return and covers a broader range of foreign financial assets. For a single taxpayer living outside the U.S., the threshold is $200,000 at year-end or $300,000 at any point during the year (these thresholds double for married couples filing jointly). The form covers bank accounts, investment accounts, pension interests, and interests in foreign companies.

Do I Still Owe U.S. State Taxes?

This depends on which state you came from. Some states release former residents cleanly once they establish a home abroad. Others — most notably California, New York, and Virginia — have a reputation for asserting continuing tax residency if ongoing ties remain.

Ties that can trigger a continuing state claim include: owning property in the state, maintaining a driver's licence, voter registration, professional licences, or regular visits. If you moved from one of the more aggressive states, it is worth taking specific advice about that state's domicile rules and whether the connection has been effectively severed.

Self-Employment and Freelancing from the UK

Self-employment does not change whether you must file — it changes the complexity of the return. Net self-employment earnings above $400 trigger a filing requirement regardless of employment income. Self-employment income must be reported on Schedule C.

One specific point for the self-employed: the FEIE excludes income from U.S. income tax but not from U.S. self-employment tax (Social Security and Medicare). Self-employment tax applies to net earnings from self-employment even when the FEIE exclusion covers those earnings for income tax purposes. The UK–U.S. Totalization Agreement may prevent dual Social Security contributions for employees, but its application to the self-employed requires specific advice.

Americans who issue or receive U.S. 1099 forms — such as those invoicing American clients — may also need to manage information returns. Tax1099, an IRS-authorised e-filing platform, can help freelancers and contractors handle the information-return side of cross-border work from abroad.

What If I Haven't Filed U.S. Taxes Since Moving?

This is very common. The filing requirement is not widely advertised, and many Americans move to the UK without realising it applies to them. If you have missed years, the first step is to understand that catching up is manageable — and is far better done proactively than reactively.

The IRS's Streamlined Foreign Offshore Procedure (SFOP) is specifically designed for Americans abroad who have missed filing due to non-willful conduct: not deliberate evasion, but genuine unawareness or misunderstanding. Under the SFOP, you file three years of overdue tax returns and six years of overdue FBARs, pay any tax and interest owed, and certify the non-willful nature of the failure on Form 14653. All penalties — including FBAR penalties — are waived.

To access the procedure, you must apply voluntarily before the IRS contacts you. Addressing missed years sooner rather than later is always preferable: it prevents the issue from surfacing unexpectedly during a mortgage application, return to the U.S., or major financial transaction.

How to Start Filing from the UK in 2026

Starting from scratch, or re-establishing a filing habit after a gap, follows the same basic sequence:

• Gather documents: P60 or P45 from your employer, bank interest statements, ISA and investment summaries, pension correspondence, and any records of property sales or major financial events. Note the annual average Treasury exchange rate for GBP/USD.
• Decide on your relief strategy: FEIE or Foreign Tax Credit (or a combination). For most straightforward salary earners in the UK, the FTC is generally the more flexible long-term choice.
• Choose how to file: Expat-specific platforms such as MyExpatTaxes, Greenback, or Expatfile handle the questions that matter for life in the UK. Contractors managing cross-border information returns may also use Tax1099 for the 1099 side of their filings.
• File the FBAR separately: Log in to FinCEN's BSA E-Filing system and complete FinCEN Form 114 for any year in which your combined foreign account balances exceeded $10,000.
• Address missed years through SFOP if needed: If you are behind, the Streamlined procedure is available penalty-free for non-willful filers. Specialist expat tax firms can guide the process.

Once the first return is filed and the structure is in place, subsequent years become a predictable annual task rather than a source of anxiety.

FAQ: U.S. Filing for Americans in the UK