US & UK Tax Services for Individuals and Families
Specialist Cross-Border Tax Support for Families and Individuals
At US UK Tax Advisors, we provide expert tax services for US citizens living in the UK, dual residents, non-domiciled individuals, and families with international income. Filing in two countries can be daunting, with different reporting standards, deadlines, and tax rules. Without specialist support, the risk of double taxation, incorrect filings, or penalties is high.
Our dual-qualified advisors make this process simple. We coordinate filings across both jurisdictions, applying the US–UK tax treaty to ensure compliance while minimising tax liabilities. Whether you are working abroad, managing rental properties, or balancing investments across borders, we deliver tailored solutions that give you peace of mind.
We help expatriates, dual citizens and families meet their US and UK tax obligations. That means accurate US expat returns and UK Self Assessment, FATCA and FBAR reporting, double-taxation relief under the treaty, and planning to keep your cross-border tax position efficient.
Key Takeaways
- US citizens and Green Card holders are taxed on worldwide income and must file with the IRS every year
- FBAR is required when foreign accounts exceed $10,000 in aggregate at any point in the year
- The US-UK treaty and foreign tax credits prevent the same income being taxed twice
- Streamlined Foreign Offshore Procedures let non-willful filers catch up with 3 years of returns and 6 FBARs
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 AssessmentOur Expertise at a Glance
Cross-border tax is complex, and choosing the right advisor makes all the difference. At US UK Tax Advisors, we combine expertise with a personal approach to deliver clarity, compliance, and confidence
- US–UK family tax specialists – Focused on expats, dual residents, and families.
- Non-domicile expertise – Guidance on SRT, remittance, and arising basis.
- Dual-qualified advisors – Seamless coordination with IRS and HMRC.
- Tailored solutions – Built around your wealth, lifestyle, and goals.
- Proven results – Decades of experience preventing double taxation.
We go beyond compliance—listening, adapting, and delivering strategies that make your obligations simple, efficient, and secure.
Comprehensive US & UK Tax Support for Families and Individuals
US UK Tax Advisors simplifies cross-border compliance for US citizens in the UK, dual residents, non-doms, and families with international income. Our team prepares and aligns UK self- assessment tax returns (SA100) with US filings (Forms 1040, 1040NR, 1040X), ensuring accuracy, consistency, and penalty-free submissions. With the right use of foreign tax credits and exclusions, we help clients avoid double taxation and optimise reliefs.
Residency and domicile rules have a major impact on UK tax exposure. We guide clients through the Statutory Residence Test (SRT) and provide tailored non-domicile tax planning for Americans in the UK. By carefully advising on the remittance versus arising basis, our advisors reduce unnecessary liabilities while keeping you compliant with both IRS and HMRC requirements.
For those with property, investments, or family wealth, we provide support with foreign income, rental property reporting, capital gains tax (CGT), and inheritance planning. The US–UK tax treaty is applied strategically to ensure income and gains are taxed fairly and only once. Beyond compliance, we deliver long- term planning for pensions, estates, and portfolios—helping families secure and grow their wealth across generations.
Individuals & Families — US-UK Tax FAQs
I'm a US citizen living in the UK — do I still file a US tax return?
Yes. US citizens and Green Card holders are taxed on worldwide income regardless of where they live, so you must file a US federal return with the IRS every year. As a UK resident you also file a Self Assessment return with HMRC. The Foreign Earned Income Exclusion, foreign tax credits and the US-UK treaty usually prevent double taxation.
What is the FBAR and do I need to file one?
The FBAR (FinCEN Form 114) reports foreign financial accounts to the US Treasury. If the aggregate value of your non-US accounts exceeds $10,000 at any point during the year, you must file, even if no single account reaches that figure. It is filed separately from your tax return and carries steep penalties for non-compliance.
How does the US-UK tax treaty stop me being taxed twice?
The US-UK double taxation treaty allocates taxing rights between the two countries and, together with foreign tax credits, lets you offset tax paid in one country against liability in the other. It covers employment income, pensions, dividends and gains, so the same income is generally not taxed in full by both HMRC and the IRS.
I've never filed US taxes while living abroad — how do I catch up?
If your failure to file was non-willful, the IRS Streamlined Foreign Offshore Procedures let you become compliant by filing the last 3 years of tax returns and 6 years of FBARs, typically without penalties. We assess your eligibility, prepare the submission and manage the certification of non-willful conduct on your behalf.
Are my UK ISAs and pensions taxable in the US?
US tax treatment of UK ISAs and pensions is complex. ISAs are not tax-free for US purposes and may involve foreign trust or PFIC reporting. UK pensions can often be given favourable treatment under the treaty, but this is fact-specific. We review each account to determine reporting and elect the most efficient treaty position available.
When are US and UK tax deadlines for people living in the UK?
US citizens abroad receive an automatic extension to 15 June to file their federal return, with a further extension available to 15 October, though any tax owed is still due in April. The UK tax year runs to 5 April, with online Self Assessment filing due by 31 January. We coordinate both calendars so nothing is missed.
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.
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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.