SPECIALIST US TAX SERVICES IN THE UK – TRUSTED IRS COMPLIANCE EXPERTS
Looking for reliable US tax advisors in London? As specialist US UK Tax Advisors, we provide comprehensive US tax services in the UK, including IRS compliance, FATCA and FBAR reporting, and international tax filings. Whether you are a US citizen living in the UK, a Green Card holder, or a non-resident with US income, our experts ensure your returns are accurate, compliant, and optimised under the US–UK tax treaty.
US Tax Services in the UK – Comprehensive IRS Support
As specialist US–UK tax advisors, we provide a full range of professional tax services for Americans in the UK, Green Card holders, dual citizens, and UK residents with US tax obligations. The IRS requires annual reporting on worldwide income, which can be overwhelming when living abroad. Our role is to simplify this process, ensuring accurate filings and full compliance at every stage.
Based in London, our team of expert US tax advisors delivers tailored solutions that go far beyond basic return preparation. From Form 1040 filings to complex matters like FATCA & FBAR reporting, PFICs, foreign corporations, trusts, and cross-border estate planning, we provide specialist support for even the most challenging cases.
Whether you need help with IRS compliance in the UK, advice on the US–UK tax treaty, or assistance with streamlined filing for delinquent returns, we deliver proactive and reliable guidance. Our goal is to help clients avoid penalties, minimise double taxation, and make confident financial decisions while managing obligations across two jurisdictions.
US Tax Services
US Tax Services in the UK – Comprehensive IRS Support
Federal & State Tax Returns
Preparation and filing of Form 1040, 1040NR, and 1040X for US citizens, non-residents, and amended filings, including state tax returns where required.
FATCA & FBAR Reporting
Comprehensive support with Form 8938 (FATCA) and FinCEN Form 114 (FBAR) to ensure all foreign assets and accounts are reported accurately and on time.
Complex International Reporting
Expert preparation of complex IRS filings, including Form 3520 (trusts), Form 5471 (foreign corporations), Form 8621 (PFICs), Form 8858 (foreign entities), and Form 8865 (foreign partnerships).
Streamlined Filing & Delinquent Returns
Assistance with the IRS Streamlined Filing Compliance Procedures (Form 14653), helping delinquent taxpayers catch up on overdue US tax returns and FBARs without heavy penalties.
Expatriation & Renunciation
Guidance through the process of renouncing US citizenship or a Green Card, including preparation of Form 8854 (Expatriation Statement) and advice on exit tax implications.
Estate & Gift Tax
Cross-border estate and gift tax planning, including Form 706 (US Estate Tax Return) and Form 3520 (foreign gifts and trusts), ensuring compliance with both US and UK rules.
Why It's Important to Choose Specialist US & UK Tax Advisors
When it comes to managing US tax services in the UK, working with general accountants is rarely enough. The US and UK tax systems are highly complex, with very different rules, reporting standards, and filing deadlines. Without the right expertise, it's easy to make mistakes that lead to unnecessary tax bills, double taxation, or even penalties from the IRS and HMRC.
By choosing specialist US UK tax advisors in London, you gain peace of mind knowing your tax affairs are handled by professionals who understand both jurisdictions inside out. We coordinate IRS compliance, FATCA and FBAR reporting, double taxation relief, and treaty planning to ensure your filings are correct and your tax position is optimised.
Cross-border taxation is not a one-size-fits-all matter. Each client has unique circumstances, and only dedicated specialists can deliver the tailored advice needed to remain compliant while protecting income, assets, and long-term wealth.
Key Industry Insights:
9.1M
US citizens living abroad required to file US tax returns annually, regardless of residence.
Source: US State Department Report 2023
$10K
Minimum penalty for failing to file FBAR (FinCEN 114) for foreign accounts over $10,000.
Source: IRS Compliance Data 2023
70%
Percentage of US expatriates unaware of all their US filing requirements and potential penalties.
Source: Expatriate Tax Compliance Survey 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.
US citizens and Green Card holders in the UK must file a US federal return every year on worldwide income. We handle IRS compliance, FATCA and FBAR reporting, and apply treaty reliefs and foreign tax credits so you stay compliant without paying tax twice.
Key Takeaways
- US persons file annually with the IRS regardless of UK residence
- FBAR is required for foreign accounts over $10,000 in aggregate
- Foreign Earned Income Exclusion and Foreign Tax Credit reduce double tax
- Automatic filing extension to 15 June, but US tax is still due in April
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 AssessmentUS Tax Services — Frequently Asked Questions
Do I still have to file a US tax return while living in the UK?
Yes. The United States taxes its citizens and Green Card holders on worldwide income regardless of where they live. If you are a US person, you must file a US federal return each year even while UK resident. Reliefs such as the Foreign Earned Income Exclusion and foreign tax credits usually reduce or eliminate any US tax due, but the filing obligation remains.
What is the difference between the Foreign Earned Income Exclusion and the Foreign Tax Credit?
The Foreign Earned Income Exclusion (Form 2555) lets you exclude a set amount of foreign earned income from US tax. The Foreign Tax Credit (Form 1116) instead credits UK tax you have already paid against your US liability. Because UK tax rates are generally higher, many US expats in the UK rely on the credit, but the best approach depends on your income mix.
Do I need to file if I earn below the threshold or owe no US tax?
Often yes. Filing thresholds are low, and even where no US tax is due after credits and exclusions, you may still be required to file the return and separate information reports such as the FBAR (FinCEN 114) for foreign accounts over $10,000 in aggregate and Form 8938 under FATCA. Penalties apply for missing these even when no tax is owed.
When are US tax returns due for Americans abroad?
US citizens living outside the United States receive an automatic extension to 15 June, with a further extension available to 15 October on request. However, any US tax owed is still due by the normal April deadline, so interest can accrue on late payments even where the filing deadline is extended.
Which US forms do American expats in the UK most commonly file?
Alongside Form 1040, common filings include Form 2555 or 1116 for expat reliefs, the FBAR for foreign accounts, Form 8938 for specified foreign assets, and Form 8621 where you hold non-US pooled funds treated as PFICs. Owners of foreign companies may also need Form 5471, and those with foreign pensions or trusts may have additional reporting.
Can you coordinate my US filing with my UK Self Assessment?
Yes. We prepare both sides together so your UK and US positions are aligned, foreign tax credits are claimed correctly, and treaty reliefs are applied consistently. Coordinating the two returns avoids double taxation, prevents mismatched figures between HMRC and the IRS, and ensures the timing of credits works in your favour.
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.