SPECIALIST UK TAX SERVICES FOR AMERICAN EXPATS IN LONDON
Looking for UK tax advisors for Americans in the UK? At US UK Tax Advisors, we specialise in self-assessment tax returns, property and capital gains reporting, pension planning, and HMRC compliance, ensuring every filing is accurate and fully coordinated with your US obligations under the US–UK tax treaty.
UK Tax Services for US Citizens & Expats
As Top US UK Tax Advisors in UK, we specialise in providing expert UK tax services for Americans living in the UK, dual citizens, and internationally mobile individuals. Managing UK tax obligations can be challenging, especially when combined with US tax rules, non-domicile status, or income from multiple jurisdictions. Our dedicated team helps American expats navigate these complexities with confidence.
As trusted UK self-assessment tax advisors in London, we prepare accurate SA100 tax returns that fully reflect both your UK and US tax position. We also advise on UK residency status, foreign income reporting, property tax, and capital gains, while coordinating your filings with US requirements to prevent double taxation.
Our deep expertise in non-domicile tax UK rules means we can provide tailored tax planning that minimises liabilities and ensures full HMRC compliance. Whether you are a US expat with UK income, a non-domicile taxpayer, or a dual resident, we deliver proactive solutions that keep your tax affairs structured, compliant, and tax-efficient across both countries.
UK Tax Services
Tax Services for Americans in the UK – Expert HMRC Support
UK Self-Assessment Tax Returns (SA100)
Expert preparation of UK self-assessment tax returns (SA100) for Americans in the UK, ensuring all income, investments, and overseas earnings are reported correctly and aligned with US filings.
Employment & Self-Employment Income (Including Foreign Income)
Tailored support for UK PAYE, freelance, and foreign income reporting, with careful application of US–UK tax treaty reliefs to prevent unnecessary double taxation.
Property & Capital Gains Reporting
Comprehensive guidance on UK property tax, rental income, and capital gains, with coordinated planning to ensure accurate reporting under both HMRC and US tax rules.
Double Taxation Relief & Treaty Planning
Proactive application of the US–UK tax treaty to income, pensions, and investments, securing foreign tax credits and structuring returns to avoid being taxed twice.
HMRC Voluntary Disclosure & Tax Compliance
Expert assistance with HMRC voluntary disclosure facilities, including the Worldwide Disclosure Facility (WDF), helping clients regularise tax affairs with reduced penalties.
Pension & Retirement Planning
Specialist advice on UK pensions, US retirement accounts, and cross-border planning, ensuring contributions, withdrawals, and benefits are structured tax-efficiently in both countries.
Why American Expats Need Specialist UK Tax Advisors
When it comes to handling UK tax services for Americans in the UK, relying on a general accountant is rarely enough. The combination of HMRC rules, US tax obligations, non-domicile status, and foreign income reporting creates complex challenges that require specialist knowledge. Without the right expertise, you risk paying more tax than necessary, missing reliefs, or facing penalties from HMRC.
By choosing experienced UK self-assessment tax advisors in London, you benefit from professionals who understand how UK tax laws interact with US tax requirements. We manage self-assessment returns, property and capital gains reporting, pension planning, and treaty reliefs to ensure your filings are accurate and your liabilities are kept to a minimum.
Every American expat's tax situation is unique, and only dedicated specialists can provide the tailored UK tax advice needed to stay compliant while safeguarding income, investments, and long-term wealth across both jurisdictions.
Key Industry Insights:
12.2M
UK taxpayers required to file Self-Assessment returns annually, with strict January 31st deadline.
Source: HMRC Statistics 2023
£100
Initial penalty for late UK Self-Assessment filing, increasing to £1,600+ for prolonged non-compliance.
Source: HMRC Penalty Schedule 2023
85%
Percentage of UK businesses now required to comply with Making Tax Digital (MTD) regulations.
Source: HMRC Digital Tax Report 2023
Get in Touch
Managing cross-border taxes doesn't have to be complicated. Whether you're a US citizen living in the UK, a UK resident with US tax obligations, or a business operating internationally, our team of specialist US UK tax accountants in London is here to help.
American expats who are UK tax resident often must file with HMRC as well as the IRS. We handle Self Assessment, property and capital gains reporting, and pension planning, coordinating every filing with your US return so treaty relief and foreign tax credits prevent double taxation.
Key Takeaways
- UK tax residence is set by the Statutory Residence Test, not citizenship
- UK residential property gains must be reported to HMRC within 60 days
- US retirement accounts are addressed under the US–UK treaty
- UK and US returns are prepared together to avoid double tax
US–UK Cross-Border Tax: Key Facts
$10,000
Aggregate in foreign accounts at any point in the year triggers a mandatory FBAR (FinCEN Form 114) for US persons.
Source: IRS — FBARWorldwide
US citizens and Green Card holders must file a US return on worldwide income every year, regardless of where they live.
Source: IRS — Citizens Abroad$120,000+
The Foreign Earned Income Exclusion lets qualifying Americans abroad exclude over $120,000 of earned income (indexed annually).
Source: IRS — FEIE31 January
UK Self Assessment online returns and any tax owed are due by 31 January following the 5 April tax year end.
Source: GOV.UK — Self AssessmentUK Tax Services — Frequently Asked Questions
Do American expats in the UK need to file a Self Assessment return?
If you are UK tax resident you may need to file a Self Assessment return with HMRC, for example if you have rental income, self-employment, capital gains, foreign income or higher earnings. Being a US citizen does not remove UK obligations — you can be required to report to both HMRC and the IRS on the same income, with treaty relief preventing double taxation.
How is my UK tax residence determined?
UK residence is decided by the Statutory Residence Test, which looks at days spent in the UK and connecting factors such as home, work and family ties. Residence, not citizenship, drives UK tax on your worldwide income. We assess your position under the test so you know exactly what the UK expects you to report.
How are UK rental property and capital gains taxed for US citizens?
UK rental profits are taxable in the UK and must also be reported on your US return, with foreign tax credits avoiding double tax. UK residential property disposals must be reported and any Capital Gains Tax paid to HMRC within 60 days of completion. The US may calculate the gain differently, so both sides need careful coordination.
Does the UK tax my US pension, 401(k) or IRA?
The US–UK tax treaty contains specific rules for pensions, and in many cases US retirement accounts are respected by the UK. Treatment of lump sums, distributions and growth can differ between the two systems, so the timing of withdrawals matters. We review each pension under the treaty to keep the UK and US treatment aligned.
How do I avoid being taxed twice on the same income in the UK and US?
Double taxation is relieved through foreign tax credits and the US–UK treaty. Generally the country with primary taxing rights is paid first, and the other country grants a credit for that tax. Applying credits in the correct order and to the right income categories is essential — done properly, you pay broadly the higher of the two rates, not both.
What happened to the non-dom remittance basis?
The remittance basis for non-domiciled UK residents was replaced from April 2025 by a new residence-based regime for foreign income and gains. If you previously relied on non-dom treatment, your UK reporting may have changed significantly. We advise on how the current rules affect your foreign income, investments and any transitional provisions.
Written & reviewed by the US-UK Tax Advisors cross-border tax team — chartered specialists in US and UK taxation, IRS and HMRC compliance, FATCA/FBAR reporting and double-taxation treaty planning.
Last reviewed: July 2026. This page is for general information and is not personal tax advice.