Skip to main content
Western EuropeEurope

US Expat Taxes in United Kingdom

The United Kingdom is one of the top destinations for American expatriates worldwide, with approximately 200,000 US citizens living across England, Scotland, Wales, and Northern Ireland according to US Embassy estimates. London alone is home to the largest concentration of Americans in Europe, drawn by its status as a global financial center, thriving technology sector in areas like Shoreditch and King's Cross, world-class universities, and deep cultural ties between the two nations. Beyond London, Americans are increasingly settling in Edinburgh's financial services cluster, Manchester's media and tech corridor, Oxford and Cambridge's academic hubs, and Bristol's aerospace and engineering industry. Access to the National Health Service (NHS) — free at the point of use for residents — is another major draw, though most visa holders must pay the Immigration Health Surcharge of £1,035 per year for NHS access. Every US citizen and green card holder living in the UK must file annual tax returns with both HMRC (Her Majesty's Revenue and Customs) and the IRS, reporting the same worldwide income to two different governments under two fundamentally different tax systems. The UK operates a Pay As You Earn (PAYE) withholding system for employment income, supplemented by Self Assessment tax returns for those with additional income sources, while the US requires a global Form 1040 regardless of where income is earned. The UK tax year runs from April 6 to April 5, creating a permanent timing mismatch with the US calendar year that complicates income matching, foreign tax credit calculations, and currency conversions. The US-UK Convention on Income and Capital Gains Taxes, signed in 2001 and entering into force in 2003, is the primary mechanism for preventing double taxation. It provides reduced withholding rates, pension coordination, and the Foreign Tax Credit framework. However, the treaty's savings clause (Article 1(4)) preserves the US right to tax its citizens on worldwide income as if the treaty did not exist, with limited exceptions. This means the treaty reduces double taxation but does not eliminate your obligation to file with both countries. One of the most consequential recent developments for US expats is the abolition of the UK's centuries-old non-domicile (non-dom) regime. Effective April 6, 2025, the remittance basis of taxation was replaced by the Foreign Income and Gains (FIG) regime. Under FIG, individuals who become UK tax resident after being non-UK resident for at least 10 consecutive tax years can elect to pay no UK tax on foreign income and gains for their first four tax years of UK residence. After the four-year FIG window expires, all worldwide income and gains become subject to UK tax. For US citizens who were previously claiming non-dom remittance basis, this is a fundamental change that requires immediate cross-border tax planning. The FIG regime also introduced a new Temporary Repatriation Facility allowing former remittance basis users to bring previously unremitted foreign income to the UK at a reduced 12% tax rate through April 2027. UK income tax rates are substantial: England, Wales, and Northern Ireland apply rates of 20% (basic), 40% (higher), and 45% (additional) on income above the £12,570 personal allowance. Scotland sets its own rates, with six bands ranging from 19% (starter) to 48% (top rate). When combined with National Insurance contributions (8% on earnings between £12,570 and £50,270 for employees), the effective marginal rate for a higher-rate taxpayer can exceed 48%. Capital gains tax runs at 18% or 24% on residential property and 10% or 20% on other assets. Dividends face rates of 8.75%, 33.75%, and 39.35% above the £1,000 dividend allowance. For US citizens, several UK-specific tax traps require careful attention. Individual Savings Accounts (ISAs) — the UK's most popular tax-advantaged savings vehicle — are treated as Passive Foreign Investment Companies (PFICs) by the IRS, triggering punitive taxation and Form 8621 reporting requirements for each fund held within the ISA wrapper. UK workplace pensions, Self-Invested Personal Pensions (SIPPs), and the State Pension each have different US tax treatment under the treaty. National Insurance contributions must be coordinated with US Social Security under the US-UK Totalization Agreement. And properties purchased in the UK are subject to Stamp Duty Land Tax (SDLT) with a 2% non-resident surcharge, plus ongoing Council Tax that is not creditable as a foreign tax on US returns. At Zenith Financial Advisors, our Enrolled Agents specialize in US-UK cross-border taxation. This guide covers every aspect of your dual filing obligations — from PAYE and Self Assessment to the ISA PFIC trap, pension coordination, the new FIG regime, Scotland-specific tax rates, and the full range of IRS forms required for UK-based Americans.

Tax Treaty Information

Active Tax TreatySince 2001
  • Reduced withholding on dividends: 15% general rate, 0% for pension funds and 80%+ corporate shareholders (Article 10)
  • Zero withholding on interest payments between the two countries (Article 11)
  • Zero withholding on royalties (Article 12)
  • Pension provisions under Article 17 allowing favorable treatment of UK State Pension, workplace pensions, and SIPPs, with source-country taxation limited to the country of residence
  • Savings clause (Article 1(4)) preserving the US right to tax its citizens and residents as if the treaty had not come into effect, with exceptions listed in Article 1(5)
  • Capital gains provisions with principal residence exemptions (Article 13)
  • Self-employment and dependent personal services coordination (Articles 14 and 15)
  • Totalization Agreement coordination for National Insurance and Social Security contributions
  • Competent authority and mandatory arbitration provisions for dispute resolution (Articles 25 and 26)
  • Non-discrimination provisions ensuring nationals of one country are not taxed more burdensomely than nationals of the other (Article 24)
  • Elimination of double taxation through foreign tax credits as the primary mechanism (Article 24)
  • Article 1 – General Scope and Savings Clause: : Article 1 defines the scope of the treaty and contains the critical savings clause in paragraph 4. The savings clause allows the United States to tax its citizens and residents (including green card holders) as if the treaty had not come into effect, with specific exceptions enumerated in paragraph 5. These exceptions include benefits under Article 17 (pensions), Article 18 (pension schemes), and Article 19 (government service). For US citizens living in the UK, this means the treaty does NOT exempt you from US tax obligations — it provides mechanisms (primarily the Foreign Tax Credit) to reduce or eliminate double taxation, but filing with both HMRC and the IRS remains mandatory.
  • Article 4 – Residence: : Defines treaty residence and provides tie-breaker rules when a person is considered resident in both countries. The sequential tie-breaker tests are: (1) permanent home, (2) center of vital interests (personal and economic relations), (3) habitual abode, and (4) nationality. If all tests are inconclusive, the competent authorities must resolve the question by mutual agreement. For US citizens permanently settled in the UK, treaty residence is typically the UK. However, due to the savings clause, treaty residence in the UK does not relieve a US citizen of the obligation to file with the IRS and pay US tax on worldwide income. The treaty residence determination primarily affects which country has primary taxing rights and how the elimination of double taxation provisions apply.
  • Article 10 – Dividends: : Dividend withholding rates under the treaty: 15% general rate for portfolio dividends; 0% for dividends paid to a pension fund recognized under Article 3 of the treaty; 0% for dividends paid to a company that beneficially owns at least 80% of the voting power of the paying company (provided certain conditions are met, including a comprehensive income tax treaty between the parent's country and the source country). For US citizens receiving UK dividends, the 15% rate typically applies, and this withholding can be claimed as a Foreign Tax Credit on Form 1116.
  • Article 11 – Interest: : Interest arising in one country and paid to a resident of the other country is taxable only in the country of residence. The 0% withholding rate on cross-border interest is one of the most beneficial provisions of the 2001 treaty, eliminating source-country taxation entirely. For US citizens with UK savings accounts or receiving interest from UK bonds, no UK withholding tax is imposed under the treaty. The interest remains taxable on both the US return (worldwide income) and the UK Self Assessment return (if the individual is UK resident).
  • Article 17 – Pensions: : Article 17 governs the taxation of pension distributions, including UK State Pension, workplace pensions, and SIPPs. Under paragraph 1, pensions and similar remuneration arising in one country and paid to a resident of the other country may be taxed in both countries, but the country of residence has primary taxing rights. For US citizens living in the UK, pension income from US sources (401(k), IRA, Social Security) may be taxed by the UK but the US retains the right to tax under the savings clause. The treaty's pension provisions are among the exceptions to the savings clause, meaning they provide genuine relief from double taxation. UK employer contributions to a qualifying pension scheme may be excludable from US income under the treaty if the employee was participating in the scheme before becoming a US resident.
  • Article 24 – Elimination of Double Taxation: : This article establishes the Foreign Tax Credit as the primary mechanism for eliminating double taxation. The US allows a credit for UK income taxes paid (including income tax and capital gains tax, but NOT National Insurance contributions, Council Tax, or VAT) against the US tax liability on the same income. For US citizens in the UK, this means filing Form 1116 to claim credit for UK taxes paid. Because UK combined rates (income tax plus applicable rates) often approach or exceed US rates for higher earners, the FTC frequently eliminates the US tax liability entirely, generating excess credits that can be carried back one year or forward ten years. However, the FTC calculation requires careful income-category matching — general category income, passive category income, and other categories must be computed separately.
  • Tiebreaker: When a US citizen is also UK tax resident, the treaty tie-breaker rules in Article 4 determine treaty residence. The tests are applied sequentially: (1) permanent home — if available in only one country, that is the treaty residence; (2) center of vital interests — where personal and economic relations are closer; (3) habitual abode — where the person spends more time; (4) nationality. Most US citizens permanently settled in the UK will be treaty residents of the UK. However, due to the savings clause (Article 1(4)), being a treaty resident of the UK does NOT exempt a US citizen from US filing and tax obligations. Treaty residence affects which country has primary taxing rights, how credits are applied, and which country's domestic law takes precedence when the treaty does not override.

FBAR & FATCA Requirements

US citizens in the UK must report all UK financial accounts on FinCEN Form 114 (FBAR) if the aggregate value of all foreign financial accounts exceeds $10,000 at any point during the calendar year. Reportable UK accounts include current accounts, savings accounts, Cash ISAs, Stocks & Shares ISAs, Innovative Finance ISAs, Lifetime ISAs, workplace pension accounts, SIPPs, investment platform accounts (Hargreaves Lansdown, AJ Bell, Vanguard UK, etc.), Premium Bonds held through National Savings & Investments (NS&I), and any other account at a UK financial institution. The FBAR deadline is April 15 with an automatic extension to October 15. FATCA Form 8938 (Statement of Specified Foreign Financial Assets) has higher thresholds for expats living abroad: $200,000 on the last day of the tax year or $300,000 at any time during the year (single filers); $400,000/$600,000 for married filing jointly. Form 8938 is filed with your Form 1040. UK financial institutions report US person account information to HMRC under the UK-US FATCA intergovernmental agreement (IGA Model 1), and HMRC transmits this data to the IRS. This means the IRS already knows about your UK accounts — failure to report carries penalties of $10,000 per violation for FBAR and up to $50,000 for continued failure to file Form 8938 after IRS notification. Important: ISA accounts must be reported on both the FBAR and Form 8938 despite being tax-free in the UK. UK pension accounts (including defined contribution workplace pensions and SIPPs) are also reportable. The IRS does not care that these accounts receive favorable UK tax treatment — they are foreign financial accounts held at foreign financial institutions and must be disclosed.

Foreign Earned Income Exclusion (FEIE)

US expats living in the UK can qualify for the Foreign Earned Income Exclusion (FEIE) of up to $132,900 for tax year 2026 by meeting either the Bona Fide Residence Test (establishing genuine residence in the UK with no definite plans to return to the US) or the Physical Presence Test (physically present in a foreign country for at least 330 full days during a 12-month period). The FEIE is claimed on Form 2555 and applies only to earned income — wages, salary, self-employment income — not to investment income, pensions, or rental income. However, because UK income tax rates are substantial (20% basic, 40% higher, 45% additional rate) and often exceed comparable US rates, many US expats in the UK find the Foreign Tax Credit (FTC, Form 1116) more advantageous than the FEIE. The FTC allows you to credit the actual UK taxes paid against your US liability, often eliminating the US tax entirely and generating excess credits that carry forward for up to ten years. You cannot claim both the FEIE and FTC on the same income. Once you elect the FEIE, revoking it requires waiting five years before you can re-elect, so this decision requires careful analysis of your specific tax situation across both jurisdictions. The FEIE also includes a Foreign Housing Exclusion for housing costs exceeding a base amount (16% of the FEIE limit). London qualifies for the high-cost locality adjustment, allowing a maximum housing exclusion significantly above the standard cap — the IRS publishes annual limits by city, and London's limit is among the highest globally due to extreme rental costs.

Need Expert Help Filing from United Kingdom?

Our Enrolled Agents specialize in US expat tax filing and can ensure you're fully compliant with both US and United Kingdom tax obligations.

Book a ConsultationExpat Services

Common Tax Issues in United Kingdom

  • 1ISA PFIC trap: Stocks & Shares ISAs, Innovative Finance ISAs, and Lifetime ISAs holding pooled funds are treated as Passive Foreign Investment Companies (PFICs) by the IRS under IRC Section 1297. Each fund within the ISA requires a separate Form 8621, and gains are taxed at the highest ordinary income rate (37% for 2026) plus an interest charge — far worse than the 0% UK rate. Cash ISAs holding only cash deposits avoid PFIC classification but interest is still taxable on your US return.
  • 2UK mutual funds and unit trusts (OEICs, unit trusts, investment trusts) are almost always PFICs for US tax purposes. Unlike US-listed ETFs, these funds pool non-US investors' money and meet the PFIC income or asset tests. US citizens should hold US-listed ETFs and mutual funds in taxable UK brokerage accounts to avoid PFIC issues entirely.
  • 3UK State Pension is taxable on your US return as income. Under the US-UK treaty Article 17, pension distributions are generally taxable in the country of residence. If you live in the UK, the State Pension is taxed by the UK and reported on your US return with a Foreign Tax Credit to prevent double taxation. When you move to the US, the State Pension becomes taxable only by the US.
  • 4UK workplace pension contributions may not be deductible on your US return. While UK employer contributions to a registered pension scheme are excluded from UK taxable income, the US does not automatically recognize this exclusion. A treaty-based position under Article 18 may allow exclusion of employer contributions, but this requires filing Form 8833 (Treaty-Based Return Position Disclosure) with your US return.
  • 5SIPP (Self-Invested Personal Pension) creates complex US reporting. Contributions may not be US-deductible, investment growth within the SIPP is potentially taxable annually for US purposes (depending on the investments held), and if the SIPP holds UK funds, those funds are PFICs. SIPPs holding individual stocks, bonds, or US-listed ETFs have simpler US treatment.
  • 6National Insurance contributions vs. US Social Security: The US-UK Totalization Agreement (effective January 1, 1985) prevents dual social security taxation. If you are employed in the UK, you pay Class 1 National Insurance contributions (8% employee rate on earnings between £12,570 and £50,270, 2% above £50,270) but not US Social Security/Medicare taxes. If your US employer sends you to the UK for up to 5 years, you can obtain a Certificate of Coverage to remain in the US system. Self-employed individuals pay Class 2 (£3.45/week) and Class 4 (6% on profits £12,570–£50,270, 2% above).
  • 7Council Tax is NOT creditable as a foreign income tax on your US return. Council Tax is a local property-based charge funding local government services, similar to US property tax. It does not qualify for the Foreign Tax Credit under IRC Section 901 because it is not levied on income. Similarly, UK VAT (20%) is not creditable.
  • 8UK tax year mismatch: The UK tax year runs April 6 to April 5, while the US tax year is the calendar year. This creates complications for foreign tax credit calculations, income matching, and currency conversions. UK PAYE deductions from January through March apply to the UK tax year ending April 5, but the same income falls in the prior US tax year (January-December). Careful record-keeping and pro-rata calculations are essential.
  • 9Stamp Duty Land Tax (SDLT) on UK property purchases: Non-UK residents pay a 2% surcharge on top of standard SDLT rates when buying residential property in England or Northern Ireland. If the property is an additional home (you own property anywhere in the world), a further 5% surcharge applies. The combined surcharges can add 7% to the base SDLT rate. Scotland charges its own Land and Buildings Transaction Tax (LBTT) with an Additional Dwelling Supplement of 8%. These are transaction taxes, not recurring — they apply only at purchase.
  • 10UK Inheritance Tax (IHT) affects US citizens with UK assets. IHT is charged at 40% on the value of a UK-domiciled person's worldwide estate above the nil-rate band of £325,000 (£500,000 if the residence is left to direct descendants). Even non-UK-domiciled individuals pay IHT on UK-situated assets (UK property, UK bank accounts, UK shares). The US-UK estate tax treaty (separate from the income tax treaty) provides some relief but does not eliminate the exposure. US citizens with significant UK assets need coordinated estate planning.
  • 11Scotland has different income tax rates from the rest of the UK. If your main home is in Scotland, you pay Scottish Income Tax rates set by the Scottish Parliament: 19% starter rate (£12,571–£14,876), 20% basic (£14,877–£26,561), 21% intermediate (£26,562–£43,662), 42% higher (£43,663–£75,000), 45% advanced (£75,001–£125,140), and 48% top rate (above £125,140). These rates create different Foreign Tax Credit calculations for US citizens in Scotland vs. England.
  • 12Making Tax Digital (MTD) for Income Tax Self Assessment becomes mandatory from April 2026 for individuals and landlords with qualifying income over £50,000. From April 2027, the threshold drops to £30,000. Under MTD, taxpayers must keep digital records and submit quarterly updates to HMRC using compatible software. US citizens with UK self-employment or rental income above these thresholds must comply with MTD in addition to their IRS filing obligations.
  • 13NHS Immigration Health Surcharge: Most visa holders must pay the Immigration Health Surcharge (IHS) of £1,035 per year (£776 for students and those under 18) to access the National Health Service. This is paid upfront for the full duration of the visa. The IHS is not a creditable tax for US purposes and is not deductible on your US return — it is treated as a personal expense, similar to health insurance premiums.
  • 14UK rental income reporting differences: UK rental income is reported on the Self Assessment tax return with different expense categories and depreciation rules (no MACRS-style depreciation in the UK — instead, replacements relief applies for furnished lettings). The US requires reporting the same rental income on Schedule E with MACRS depreciation, creating permanent differences between the two returns. The mortgage interest restriction (limited to basic rate 20% tax relief in the UK) does not apply to the US Schedule E where full deduction is available.
  • 15Foreign Tax Credit category matching: UK income tax, capital gains tax, and dividend tax are generally creditable as foreign income taxes under IRC Section 901. However, credits must be allocated to the correct Form 1116 category (general category for employment/self-employment income, passive category for investment income and rental income). Misallocation can result in excess credits in one category and tax owed in another.

Filing Deadlines

Regular FilingApril 15 (automatic 2-month extension to June 15 for US citizens living abroad)
ExtensionOctober 15 (with Form 4868). UK Self Assessment Online: January 31 following the end of the UK tax year (e.g., January 31, 2027 for the 2025/26 tax year ending April 5, 2026). Paper: October 31 following the end of the UK tax year. Payments on Account: January 31 and July 31 (two equal installments of estimated tax for the current year, based on prior year liability exceeding £1,000). Registration: By October 5 following the end of the tax year in which you first need to file (e.g., October 5, 2026 for 2025/26 income)
FBAR DeadlineApril 15 (automatic extension to October 15, no form needed to extend)

Local Tax Rates

Income Tax

England/Wales/NI: {'personalAllowance': '£0–£12,570: 0% (personal allowance tapers by £1 for every £2 of income above £100,000, fully withdrawn at £125,140)', 'basicRate': '£12,571–£50,270: 20%', 'higherRate': '£50,271–£125,140: 40%', 'additionalRate': 'Above £125,140: 45%'}. Scotland: {'personalAllowance': '£0–£12,570: 0% (same taper as rest of UK)', 'starterRate': '£12,571–£14,876: 19%', 'basicRate': '£14,877–£26,561: 20%', 'intermediateRate': '£26,562–£43,662: 21%', 'higherRate': '£43,663–£75,000: 42%', 'advancedRate': '£75,001–£125,140: 45%', 'topRate': 'Above £125,140: 48%'}. Dividends: {'allowance': '£1,000 tax-free dividend allowance (2025/26)', 'basicRate': '8.75%', 'higherRate': '33.75%', 'additionalRate': '39.35%'}. National Insurance: {'class1Employee': '8% on earnings £12,570–£50,270; 2% above £50,270', 'class1Employer': '13.8% on earnings above £5,000 (from April 2025, threshold lowered from £9,100)', 'class2SelfEmployed': '£3.45 per week (flat rate, profits above £12,570)', 'class4SelfEmployed': '6% on profits £12,570–£50,270; 2% above £50,270'}

Capital Gains

Residential property: 18% (basic rate taxpayers), 24% (higher/additional rate taxpayers). Other assets: 10% (basic rate taxpayers), 20% (higher/additional rate taxpayers). Annual exempt amount: £3,000 per individual (2025/26)

VAT/GST

20% (standard), 5% (reduced for domestic fuel, children's car seats), 0% (zero-rated for food, children's clothing, books, newspapers). Inheritance Tax: 40% on estates above £325,000 nil-rate band (£500,000 with residence nil-rate band if main residence passed to direct descendants); transferable nil-rate band between spouses. Stamp Duty: {'residential': '0% up to £250,000; 5% £250,001–£925,000; 10% £925,001–£1,500,000; 12% above £1,500,000', 'nonResidentSurcharge': 'Additional 2% on all bands for non-UK residents', 'additionalPropertySurcharge': 'Additional 5% on all bands for second homes/buy-to-let (from October 2024, increased from 3%)'}

Local Resources

US Embassy & Consulates in the United Kingdom

Consular services, passport renewal, notarial services, and emergency assistance for US citizens in England, Scotland, Wales, and Northern Ireland

HMRC (Her Majesty's Revenue and Customs)

UK tax authority — Self Assessment registration, PAYE queries, National Insurance records, and Making Tax Digital enrollment

IRS International Taxpayers

IRS guidance for US citizens abroad including FBAR filing, FATCA, Foreign Tax Credit, FEIE, and tax treaty information

US-UK Tax Treaty (Full Text)

Complete text of the 2001 US-UK Convention on Income and Capital Gains Taxes, protocol, and technical explanation

GOV.UK – Tax for UK Residents with Foreign Income

HMRC guidance on reporting foreign income, the FIG regime, and claiming relief for foreign taxes paid

US-UK Totalization Agreement

Full text of the Social Security agreement between the US and UK, including Certificate of Coverage procedures

Frequently Asked Questions: US Taxes in United Kingdom

Are my UK ISA savings taxable in the US?
Yes. The IRS does not recognize ISAs (Individual Savings Accounts) as tax-advantaged accounts. All interest, dividends, and capital gains earned within any type of ISA — Cash ISA, Stocks & Shares ISA, Innovative Finance ISA, or Lifetime ISA — are fully taxable on your US return in the year they are earned. Worse, if your ISA holds UK-domiciled funds (unit trusts, OEICs, or investment trusts), each fund is classified as a Passive Foreign Investment Company (PFIC) under IRC Section 1297. PFIC taxation under the default Section 1291 rules is punitive: gains are taxed at the highest ordinary income rate (37% for 2026) plus an interest charge, regardless of your actual tax bracket. Each PFIC requires a separate Form 8621 filed with your US return, and the compliance cost alone can exceed the tax benefit of the ISA. Since the UK charges 0% tax on ISA income, you receive no Foreign Tax Credit to offset the US tax. Our recommendation: US citizens should avoid Stocks & Shares ISAs entirely. If you already hold one, consider liquidating the fund holdings and either closing the ISA or holding only cash deposits (which avoid PFIC classification but remain US-taxable as interest income). Invest instead through US-listed ETFs in a standard UK brokerage account.
How does PAYE work for American expats in the UK?
PAYE (Pay As You Earn) is the UK's withholding system for employment income — the equivalent of US payroll withholding. Your UK employer deducts income tax and National Insurance contributions from your salary before you receive it, based on a tax code issued by HMRC. The standard tax code for 2025/26 is 1257L, reflecting the £12,570 personal allowance. If PAYE is your only income source and it is correctly coded, you may not need to file a UK Self Assessment return (though you still must file a US Form 1040). However, PAYE does not account for your US tax obligations. The UK taxes withheld through PAYE can be claimed as Foreign Tax Credits on IRS Form 1116. Important: Your PAYE tax code may be wrong if HMRC does not know about other income sources, benefits in kind, or if you joined mid-year. Check your tax code on your payslip or through your HMRC Personal Tax Account online. If you have non-PAYE income (rental income, self-employment, dividends above £1,000, or foreign income), you must register for and file a Self Assessment return with HMRC by the January 31 deadline.
What is the FIG regime and how does it affect US expats?
The Foreign Income and Gains (FIG) regime replaced the UK's non-domicile/remittance basis system effective April 6, 2025. Under FIG, individuals who become UK tax resident after at least 10 consecutive tax years of non-UK residence can elect to exclude foreign income and gains from UK tax for their first four UK-resident tax years. After the four-year window, all worldwide income and gains are subject to UK tax regardless of domicile. For US citizens moving to the UK, FIG can provide a temporary UK tax holiday on US-source investment income, rental income, and capital gains during the initial four years. However, remember the US still taxes you on worldwide income under the savings clause, so FIG reduces your UK tax but not your US tax. The practical benefit is that during the FIG period, you may have less UK tax to credit against your US liability, potentially meaning you owe more to the IRS. Planning tip: If you elect FIG, you lose the UK personal allowance (£12,570) and the capital gains annual exempt amount (£3,000) for that year. Run the numbers to confirm FIG is beneficial for your total US-UK position. Additionally, the Temporary Repatriation Facility allows former remittance basis users to bring previously unremitted foreign income and gains to the UK at a reduced 12% rate through April 5, 2027.
Do I need to file a UK Self Assessment tax return?
You must register for and file a UK Self Assessment tax return if any of the following apply: you are self-employed as a sole trader or in a partnership; you have untaxed income (e.g., rental income, foreign income, dividends above the £1,000 allowance, savings interest above your personal savings allowance); your total taxable income exceeds £150,000; you need to claim tax reliefs; you receive child benefit and your income exceeds £60,000 (High Income Child Benefit Charge); or HMRC asks you to file. If your only income is PAYE employment income with the correct tax code, you likely do not need to file Self Assessment. To register, submit form SA1 to HMRC by October 5 after the end of the tax year in which you first had reportable income. Online Self Assessment returns are due by January 31 following the end of the tax year (e.g., January 31, 2027 for the 2025/26 tax year). Paper returns are due by October 31. Late filing triggers an automatic £100 penalty, increasing to daily penalties of £10/day after 3 months, and 5% of tax owed after 6 and 12 months. Separately, you must still file your US Form 1040 and all required international information returns (FBAR, Form 8938, Form 8621, etc.).
What about Scotland's different tax rates — do they affect my US filing?
Yes. If your main home is in Scotland, you pay Scottish Income Tax rates set by the Scottish Parliament, which differ from the rest of the UK. For 2025/26, Scotland has six rates: 19% starter (£12,571–£14,876), 20% basic (£14,877–£26,561), 21% intermediate (£26,562–£43,662), 42% higher (£43,663–£75,000), 45% advanced (£75,001–£125,140), and 48% top rate (above £125,140). The higher top rate means a US citizen in Scotland pays 3% more on income above £125,140 compared to England. For US filing purposes, this means higher Foreign Tax Credits are available. Your PAYE tax code starts with 'S' (e.g., S1257L) to indicate Scottish rates. National Insurance rates are the same across the UK — Scotland only sets its own income tax rates. The higher Scottish rates can actually benefit US citizens because the larger FTC may fully eliminate US tax liability and create excess credits for carry-forward.
How is my UK pension taxed in the US?
UK pensions fall into three main categories, each with different US tax treatment. (1) UK State Pension: Taxable as ordinary income on your US return. If you live in the UK, it is also taxed by the UK, and you claim a Foreign Tax Credit. If you move to the US, the State Pension is taxable only by the US under Article 17 of the treaty. The full new State Pension is £221.20 per week (2025/26), or approximately $14,800 per year. (2) Workplace pension (auto-enrollment): Your UK employer must enroll you and contribute at least 3% of qualifying earnings. Your contributions (5% minimum including tax relief) may not be deductible on your US return without a treaty position filed on Form 8833. Employer contributions may be excludable under Article 18 if you were in the scheme before becoming US-connected. Distributions are taxed as ordinary income by both countries. (3) SIPP (Self-Invested Personal Pension): Contributions receive UK tax relief at your marginal rate but are NOT deductible on your US return. Investment growth inside the SIPP may be taxable annually for US purposes. If the SIPP holds UK funds, those are PFICs. Distributions are taxed as ordinary income. The 25% tax-free lump sum available under UK rules is NOT tax-free for US purposes — it is fully taxable on your US return.
What IRS forms do I need to file as a US citizen in the UK?
US citizens in the UK typically file a substantial number of forms. Core returns: Form 1040 (US Individual Income Tax Return); Form 1116 (Foreign Tax Credit, with separate categories for general and passive income); Schedule B (Interest and Dividends, with Part III requiring disclosure of foreign accounts). International information returns: FinCEN Form 114 / FBAR (Report of Foreign Bank Accounts, filed electronically with FinCEN if aggregate foreign accounts exceed $10,000); Form 8938 (FATCA Statement of Specified Foreign Financial Assets, if thresholds are met). Treaty and investment forms: Form 8833 (Treaty-Based Return Position Disclosure — required when claiming treaty benefits for pension exclusions, FIG regime positions, or other non-automatic treaty elections); Form 8621 (PFIC Annual Information Statement — one form per PFIC, required for each UK fund held in ISAs, SIPPs, or taxable accounts); Form 2555 (if electing the Foreign Earned Income Exclusion instead of the FTC). Other potential forms: Form 3520/3520-A (if you are a beneficiary of a UK trust or certain pension arrangements treated as trusts); Form 5471 (if you own 10%+ of a UK corporation); Form 8865 (if you are a partner in a UK partnership with US partners). Missing even one form can trigger penalties of $10,000+ per form.
What is split-year treatment and can I claim it?
Split-year treatment is a UK concept that applies in the tax year you arrive in or depart from the UK. Under the Statutory Residence Test (SRT), if you become UK resident during a tax year (April 6 to April 5), you may qualify for split-year treatment, which means you are treated as UK resident only from the date of your arrival. Income earned before that date is not subject to UK tax (assuming it is not UK-sourced). Similarly, if you leave the UK partway through a tax year, income earned after departure is not UK-taxable. There are eight cases for split-year treatment in the SRT legislation (Schedule 45, Finance Act 2013), covering scenarios like starting full-time work in the UK, ceasing full-time work overseas, accompanying a spouse, and others. For US tax purposes, you remain a US taxpayer on worldwide income for the entire calendar year regardless of split-year treatment. The practical benefit is that split-year treatment reduces the UK tax paid on arrival-year income, which in turn reduces the Foreign Tax Credit available on your US return. If you are moving to or from the UK, consult a cross-border specialist to optimize both jurisdictions.
How does the Statutory Residence Test (SRT) determine my UK tax status?
The Statutory Residence Test (SRT) is the legal framework determining whether you are UK tax resident for a given tax year (April 6 to April 5). It consists of three parts applied in order. First, the automatic overseas tests: you are automatically non-UK-resident if you were UK resident in none of the previous three tax years and spend fewer than 46 days in the UK, or if you were UK resident in one or more of the previous three years and spend fewer than 16 days in the UK. Second, the automatic UK tests: you are automatically UK resident if you spend 183 or more days in the UK, your only home is in the UK for at least 91 consecutive days (at least 30 of which fall in the tax year), or you work full-time in the UK. Third, if neither automatic test is conclusive, the sufficient ties test applies — your UK ties (family, accommodation, work, 90-day, and country ties) are counted and cross-referenced with the number of days spent in the UK. More ties mean fewer days are needed to be UK resident. For US citizens, SRT residence determines your UK tax obligations but has no effect on your US filing obligations, which are based on citizenship regardless of residence.
What is the P60 and how does it relate to my US tax return?
The P60 is a year-end certificate your UK employer must provide by May 31 after each tax year (April 6 to April 5). It shows your total pay and tax deducted through PAYE for the year — the UK equivalent of a US W-2. You need the P60 to prepare both your UK Self Assessment return (if required) and your US Form 1040. The P60 shows gross pay, income tax deducted, National Insurance contributions (both employee and employer), student loan deductions, and statutory payments. For your US return, convert the gross pay and UK tax figures from pounds to dollars using the IRS annual average exchange rate. The income tax shown on the P60 is the amount you claim as a Foreign Tax Credit on Form 1116. Note: National Insurance contributions are NOT creditable as foreign income taxes — they are social security taxes covered by the Totalization Agreement. If you leave a job mid-year, you receive a P45 instead, showing pay and tax from that employment. Your new employer uses the P45 to set your tax code.
Do I need to pay US Social Security if I pay UK National Insurance?
Generally no, thanks to the US-UK Totalization Agreement effective January 1, 1985. If you are employed in the UK by a UK employer, you pay UK National Insurance contributions only and are exempt from US Social Security and Medicare taxes (FICA). If you are sent by a US employer to work temporarily in the UK (up to 5 years), your US employer can obtain a Certificate of Coverage (Form USA/UK 1) from the US Social Security Administration, allowing you to remain in the US Social Security system and be exempt from UK National Insurance. Self-employed individuals generally pay into the system of the country where they reside. For benefit qualification, the Totalization Agreement lets you combine US and UK social security credits to qualify for benefits in either country. You need at least 6 quarters (18 months) of US coverage to use totalization. UK National Insurance years count toward US benefit eligibility (and vice versa), but each country pays its own benefit based on its own formula.
How is UK rental income reported on my US return?
UK rental income must be reported on both your UK Self Assessment return and your US Schedule E. The UK and US use different rules for deductible expenses: the UK limits mortgage interest relief to 20% tax reduction (not a full deduction) for individual landlords, while the US allows full mortgage interest deduction on Schedule E. The UK does not allow MACRS-style depreciation — instead, replacements relief allows deduction of the cost of replacing furnishings (not the original purchase). The US requires MACRS depreciation of the building over 27.5 years and 30 years for foreign property. Currency conversion adds complexity: rental income received in pounds must be converted to dollars at the exchange rate on the date of receipt or using the annual average rate. UK income tax paid on rental profits is creditable on Form 1116 (passive category). If your UK rental income exceeds £50,000, you must also comply with Making Tax Digital from April 2026.
What happens to my 401(k) or IRA when I move to the UK?
Your US retirement accounts remain intact and continue to grow tax-deferred under US rules. You do not need to close or transfer them. However, UK tax treatment requires attention. Traditional IRA and 401(k) distributions received while living in the UK are taxable by both countries — the US taxes them as ordinary income, and the UK taxes them under the treaty (Article 17) with a Foreign Tax Credit to prevent double taxation. Roth IRA growth is tax-free for US purposes, but the UK does not automatically recognize the Roth's tax-free status. You should report Roth distributions on your UK Self Assessment return and claim treaty relief under Article 17 — the position that the distribution is not taxable has been accepted by HMRC in practice but is not explicitly stated in the treaty. File Form 8833 to formally disclose this treaty position. You generally cannot contribute to a Roth IRA while living in the UK if your earned income is excluded under the FEIE (excluded income does not count as compensation for Roth purposes). If you claim the FTC instead of the FEIE, your UK-source earned income qualifies as compensation and Roth contributions remain possible up to the annual limit ($7,000 for 2026, $8,000 if over 50).

Related Country Guides

IrelandCanadaAustralia

Ready to File Your US Taxes from United Kingdom?

Our team of Enrolled Agents specializes in cross-border taxation and can help you navigate your tax obligations in United Kingdom.

Book a ConsultationContact Us

Ready to Get Started?

Schedule a consultation or explore our services to see how we can help with your tax and accounting needs.

Book ConsultationContact Us

Need immediate assistance? Call us at +1 (409) 916-8209