Expert US & UK Tax Advisors for Expats, Dual Citizens, and Families
Expert cross-border tax advice for US citizens in the UK, UK residents with US tax obligations, and internationally active businesses. As Expert US andUK Tax Advisors, we simplify IRS and HMRC compliance, provide double taxation relief, and deliver tailored solutions that protect your wealth and optimise your financial position across both countries.
About Us – US UK Tax Advisors
We are US UK Tax Advisors based in the UK, specialising in cross-border taxation for individuals and businesses with obligations in both the United States and the United Kingdom. Our team of experienced US UK tax accountants and advisors is dedicated to simplifying complex tax matters while ensuring full compliance with both IRS and HMRC regulations.
We work closely with US citizens living in the UK, UK residents with US tax obligations, expatriates, dual citizens, and internationally active businesses. From tax return preparation to double taxation relief, FATCA and FBAR reporting, and international tax planning, our services are designed to give you clarity and peace of mind.
At US UK Tax Advisors, we combine technical expertise with a personal approach. Our mission is to protect your wealth, optimise your tax position, and provide trusted guidance for all your cross-border tax needs.
Our People
At US UK Tax Advisors, our clients are at the heart of everything we do. We believe in building lasting relationships based on trust, clarity, and personal service. Every client is unique, and we take pride in providing tailored tax solutions that meet individual needs while ensuring full compliance with both IRS and HMRC regulations.
Our strength lies in our team of experienced US and UK tax experts. With deep knowledge of cross-border taxation, international compliance, and strategic tax planning, we work collaboratively to deliver the highest level of service. Whether supporting expatriates, dual citizens, or international businesses, our advisors are committed to simplifying complex tax matters and giving clients peace of mind.
Meet Our Team of Experts
Your Cross-Border Tax Experts at US UK Tax Advisors
Henry Simons
Tax Partner
Sal Tarar
Senior US & UK Tax Manager
David Foster
US Tax Manager
Emma Sinclaire
UK Tax Manager
Molly W.
US & UK Business Development Manager
Hannah Smith
Assistant Accountant
Our Approach
Our approach is built on trust, expertise, and a personal commitment to every client. As specialist US UK tax advisors, we go beyond standard compliance to form lasting relationships with the expatriates, dual citizens, and internationally active businesses we serve. We understand that cross-border tax situations are never straightforward—so our solutions aren ’t either. Instead, we provide clear, tailored tax advice that simplifies complexity and protects your financial future.
As trusted US and UK tax accountants in London, we ask our team to be proactive, precise, and client-focused in everything they do. In return, we invest in their growth—offering specialist training in IRS and HMRC regulations, double taxation relief, FATCA, and FBAR compliance. By combining technical excellence with a deep understanding of cross-border challenges, we empower our clients to make confident financial decisions and achieve lasting security across both the United States and the United Kingdom.
Key Industry Insights:
25+
Years of combined experience in US-UK cross-border taxation
Source: Internal Company Data 2024
500+
Clients successfully supported with their US-UK tax obligations
Source: Internal Client Records 2024
100%
Commitment to keeping our clients compliant and protected
Source: Our Promise to You
Our Services
US-UK Business Expansion
Virtual Finance Office
Accountancy
Business Structuring
Cross-Border Tax Planning
International Tax Compliance & Advisory
Why Choose Us – Specialist US UK Tax Advisors in London
Choosing the right tax advisor is essential when managing obligations in two countries. At US UK Tax Advisors, we specialise exclusively in cross-border taxation for the United States and the United Kingdom, giving our clients clarity, compliance, and confidence.
Our team of experienced US UK tax accountants combines in- depth knowledge of IRS and HMRC regulations with a proactive, personalised approach. From tax return preparation to double taxation relief, FATCA and FBAR reporting, and international tax planning, we deliver solutions that are precise, reliable, and tailored to your needs.
Clients trust us because we go beyond standard compliance. We simplify complex rules, protect your income from unnecessary taxation, and provide ongoing support that evolves with your circumstances. Whether you are a US citizen living in the UK, a UK resident with US tax obligations, or a business operating internationally, US UK Tax Advisors is the partner you can rely on for trusted cross-border expertise.
US-UK Tax Advisors is a specialist cross-border tax team helping US citizens in the UK, dual citizens, expatriates and international businesses meet their obligations to both the IRS and HMRC. We prepare US and UK returns together, apply the US-UK treaty, and plan to keep clients compliant and tax-efficient.
Key Takeaways
- We serve US citizens and Green Card holders in the UK, dual citizens, expats and cross-border businesses
- We prepare US and UK filings in tandem, including FATCA, FBAR and treaty claims
- Our focus is exclusively US-UK cross-border taxation, not general single-country accounting
- We can bring non-compliant filers up to date via the IRS Streamlined Foreign Offshore Procedures
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 AssessmentAbout US-UK Tax Advisors — FAQs
Who does US-UK Tax Advisors help?
We work with US citizens and Green Card holders living in the UK, UK residents with US tax obligations, dual citizens, expatriates, internationally mobile families and businesses operating across both countries. If your income, assets or company touch both the United States and the United Kingdom, we can coordinate your compliance and planning in both systems.
What makes cross-border US-UK tax advice different from a regular accountant?
Most accountants specialise in one country's rules. Cross-border work means applying US and UK law together, using the US-UK tax treaty, foreign tax credits, and matching reporting such as FATCA, FBAR and Self Assessment. Getting one side right can create problems on the other, so we prepare both positions in tandem to avoid double taxation and missed filings.
Are you able to prepare both US and UK tax returns?
Yes. We prepare US federal (and where needed state) returns with the IRS alongside UK Self Assessment returns for HMRC, plus the supporting forms such as FBAR, Form 8938, Form 5471 and treaty claims. Handling both sides in one place means your filings are consistent, reliefs are claimed correctly, and deadlines in both countries are coordinated.
Do you only work with clients in London?
No. While we are based in the UK with a London office and also have a US presence, cross-border tax work is largely handled remotely and securely. We serve internationally mobile individuals and businesses across the United Kingdom, the United States and beyond, so your location does not limit our ability to manage your US-UK tax affairs.
Can you help if I am years behind on my US filings?
Yes. Many of our clients did not realise US citizens must file from abroad. For non-willful cases, the IRS Streamlined Foreign Offshore Procedures allow you to catch up with the last 3 years of returns and 6 years of FBARs, usually without penalties. We assess eligibility and manage the full submission so you become compliant with confidence.
How do I start working with you?
You can book a consultation through our contact page or by phone. We begin by understanding your residence, citizenship and income across both countries, then outline the filings and planning you need. From there we agree scope and manage your US and UK tax obligations on an ongoing basis so nothing falls between the two systems.
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.
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.