An impeccable, highly personalised service
We deliver the full range of US–UK cross-border tax services for individuals and businesses: US and UK tax returns, treaty-based cross-border planning, IRS streamlined filing, business expansion and corporate tax. Preparing both sides together keeps you compliant with the IRS and HMRC while avoiding double taxation.
Key Takeaways
- US tax returns, IRS compliance and FATCA/FBAR reporting
- UK Self Assessment, property, capital gains and pension filings
- Cross-border planning, streamlined filing and business expansion
- US and UK returns prepared together to avoid double taxation
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 and UK Tax Accountants
Our Services — Frequently Asked Questions
What services do you offer for US–UK clients?
We provide the full range of cross-border services: US tax return preparation and IRS compliance, UK Self Assessment and HMRC filings, cross-border tax planning under the US–UK treaty, IRS streamlined filing for those behind on returns, business establishment and expansion, and corporate tax for companies with US and UK interests.
Do you help both individuals and businesses?
Yes. We advise individuals, families and high-net-worth clients as well as companies. For individuals we handle expat returns, FBAR and FATCA reporting and treaty planning; for businesses we cover corporation tax, Form 5471, GILTI, transfer pricing and cross-border expansion. Many clients use us for both their personal and company filings.
Can you prepare my US and UK returns together?
Yes, and this is where specialist advice adds most value. Preparing both returns in tandem ensures foreign tax credits are claimed in the right order, treaty positions are consistent, and figures reported to the IRS and HMRC match. Coordinated filing is the most reliable way to avoid double taxation and reduce the risk of enquiry.
I'm behind on my filings — can you help me catch up?
Yes. If you are a non-willful US taxpayer who has missed returns while abroad, the IRS Streamlined Filing Compliance Procedures usually allow you to file the last 3 years of returns and 6 years of FBARs penalty-free. We assess eligibility, prepare the submission and manage the process end to end.
Do you only serve clients based in London?
No. While we have specialist US–UK expertise rooted in London and offices across the US, we serve clients throughout the United Kingdom and the United States, as well as internationally mobile individuals and businesses. Most of our work is handled remotely and securely, wherever you are based.
How do I get started?
Book a consultation and outline your situation — your residence, citizenship, income sources and any businesses. We assess your US and UK obligations, flag any missed filings or planning opportunities, and set out a clear scope and next steps so you know exactly what is required on both sides.
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.
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.