US Expat Taxes in United Kingdom
EuropeTax Treaty
Yes
Tax System
worldwide
Social Security
Totalization Agreement
FEIE Qualification in United Kingdom
Physical Presence Test
The UK does not share a border with the US, making the 330-day physical presence test more straightforward. Track any US visits including layovers or business trips that count as days in the US.
Bona Fide Residence Test
Indefinite Leave to Remain (ILR), a valid UK work visa, or UK settled status post-Brexit strongly support bona fide residence. HMRC tax registration and UK National Insurance contributions further establish residency.
Common Visa Types:
United Kingdom Tax System
Taxes residents on their worldwide income, regardless of where it is earned.
Tax Rates
Progressive rates: 20% basic (up to £50,270), 40% higher (to £125,140), 45% additional rate
The US has a Totalization Agreement with United Kingdom, preventing double Social Security taxation.
US-United Kingdom Tax Treaty
Treaty signed: 2001
Key Provisions:
- Zero withholding on dividends paid to pension funds
- Reduced withholding on royalties (0%) and interest (0%)
- Pension provisions allowing source-country or residence-country taxation
- Capital gains generally taxed only in country of residence
Banking & FBAR in United Kingdom
Major Banks (GBP)
FBAR Reminder
All UK bank accounts, ISAs, and investment accounts with aggregate balances exceeding $10,000 must be reported on FBAR. UK ISAs (Individual Savings Accounts) are not tax-advantaged for US purposes and must be reported.
FATCA Compliance
The UK signed a Model 1 IGA with the US in 2012. UK banks report US person account data to HMRC, which forwards it to the IRS. Some UK banks may decline to open accounts for US citizens due to compliance costs.
Common Pitfalls for Americans in United Kingdom
ISAs (Individual Savings Accounts) are NOT tax-free for US tax purposes - all ISA income is US-taxable
UK pensions (including workplace pensions) may require complex US reporting on Form 3520/3520-A
Remittance basis of taxation for non-domiciled residents creates complex interactions with US worldwide taxation
Failing to coordinate US and UK tax years (UK tax year runs April 6 to April 5)
Not reporting UK Premium Bonds winnings as taxable income on your US return
Cost of Living Overview
Monthly Estimate
$2,500-$4,000
vs. US
Comparable to or higher than major US cities, especially in London
Notes
London is significantly more expensive than other UK cities. Cities like Manchester, Edinburgh, and Bristol offer lower costs. The NHS provides free healthcare at point of use, offsetting health insurance costs.
FAQ: US Taxes in United Kingdom
Are UK ISAs tax-free for US expats?
No. While ISAs are tax-free in the UK, the IRS does not recognize them as tax-advantaged. All interest, dividends, and capital gains inside your ISA are taxable on your US return. ISAs may also be classified as Passive Foreign Investment Companies (PFICs), requiring Form 8621.
Do I need to report my UK pension to the IRS?
Yes. UK workplace and personal pensions may need to be reported as foreign trusts (Forms 3520 and 3520-A), though treaty-based positions can simplify reporting. Contributions by your UK employer may be taxable for US purposes. Consult a cross-border tax specialist.
Is the Foreign Tax Credit or FEIE better for UK expats?
Given the UK's high tax rates, most US expats in the UK benefit more from the Foreign Tax Credit (FTC). UK taxes typically exceed US taxes on the same income, generating excess credits that can carry forward. The FEIE may help if your income is below the exclusion amount.
How does the UK-US totalization agreement affect National Insurance?
The totalization agreement prevents paying both US Social Security and UK National Insurance simultaneously. Temporary US workers in the UK can stay on US Social Security for up to 5 years. Locally employed expats pay into UK National Insurance, and credits from both countries can be combined for benefit eligibility.
What happens to my UK taxes if I claim non-domiciled status?
Non-domiciled UK residents can elect the remittance basis, paying UK tax only on income brought into the UK. However, as a US citizen, you owe US tax on worldwide income regardless. This mismatch requires careful coordination to properly claim Foreign Tax Credits.