Tax help for Green Card holders living in the UK
The Green Card is a tax status as much as an immigration one. Until it is formally given up, the US treats you as a resident taxpayer — even if you have lived in Britain for years and the card sits forgotten in a drawer.
Last reviewed 1 September 2026 · 2 min read
This guide applies to you if:
- You hold a Green Card and currently live in the UK
- You are a returning Brit who kept a Green Card after leaving the US
- You are weighing up keeping, using or surrendering the card
Your situation
You hold — or once held — US lawful permanent residence, and you now live in the UK. Maybe the move is temporary and you intend to return; maybe you came home for good and never dealt with the card. Either way, the IRS's view is blunt: a Green Card holder is a US tax resident until the card is formally surrendered or revoked. Geography does not end it. Time does not end it. Only paperwork does.
What each country expects from you
The United States expects the same of you as of a citizen abroad: annual returns on worldwide income above the filing thresholds — UK salary, rent, investments, the lot — with the automatic 15 June extension for those overseas and a further extension to 15 October available. The FBAR applies once your non-US accounts together exceed $10,000, and FATCA reporting on Form 8938 can apply at higher levels.
The United Kingdom taxes you as a resident on your worldwide income and gains, through PAYE and, where needed, Self Assessment — online returns due 31 January, with registration by 5 October after the tax year ends. So without planning you sit squarely in both systems at once, on two misaligned tax calendars, kept apart mainly by foreign tax credits and the treaty — which relieve double taxation only when both returns are prepared to claim them.
The classic traps
- Assuming the card lapsed by itself. Immigration officers may treat a long-absent card as abandoned; the tax rules do not. The obligations run until formal abandonment.
- The casual treaty tie-breaker. Claiming UK treaty residence on a US return can reduce US tax, but it can also endanger the immigration status you are trying to preserve and interact with the expatriation rules. It is a strategic decision, not a checkbox.
- Becoming a long-term resident by accident. Hold the card long enough and you can fall within the US expatriation tax regime when you eventually give it up — a threshold worth knowing about well before you reach it.
- UK investments chosen without US eyes. ISAs, UK funds and some pension choices carry the same US complications for Green Card holders as for citizens; the card gives you all of the downside with none of the passport.
One firm, both returns
Green Card cases turn on sequencing: what you file in each country, in which order, and when within a tax year you act. Because we prepare both the US returns and the UK Self Assessment, we can model the whole position — keep-the-card, tie-break, or exit — and then file both sides consistently with whichever path you choose. Fixed fees are agreed before work begins.
When to get advice
Three moments matter most: when you arrive in the UK still holding the card, when you are deciding whether to keep it, and before you sign anything abandoning it. If any of those is close — or if years of US filings are already missing — contact us and we will set out your options and their costs before you commit to anything.
Frequently asked questions
I left the US years ago. Surely my US tax residency has lapsed?
No — this is the central Green Card trap. For tax purposes you generally remain a US resident until the card is formally abandoned or revoked, regardless of where you actually live or whether the card would still be honoured at the border. Filing obligations continue in the meantime.
Can I use the US–UK treaty to be treated as a UK resident only?
Sometimes, via the treaty tie-breaker — but it is not a free choice. Taking that position has consequences for your immigration status and can count towards or trigger the expatriation rules for long-term residents. It should never be ticked on a return without advice.
How do I give up a Green Card properly?
Abandonment is a formal step, usually via Form I-407, and the tax side needs handling alongside it. Long-term holders can fall within the US expatriation tax rules, and the timing of the abandonment within a tax year affects that year's filings. Planned well, most people exit cleanly.
Do I still file FBARs while I hold the card?
Yes. As a US tax resident you file an FBAR if your non-US accounts together exceeded $10,000 at any point in the year — for a Green Card holder living in Britain, that captures ordinary UK bank accounts, savings and ISAs.
Sources & further reading
This page provides general information about US and UK tax rules. It is not personalised tax advice, and rules change — always take professional advice on your own circumstances before acting. Content last reviewed on 1 September 2026.
Related guides
Green Card Holders Abroad: US Tax Residency That Travels With You
Why lawful permanent residents remain US-taxable wherever they live, the risks of treaty tie-breaker claims, and how giving up a Green Card works — Form I-407, Form 8854 and the long-term resident exit tax.
Learn moreDual US–UK Tax Residency: When Both Countries Claim You
How the US and UK can both treat you as tax resident at once, how the treaty tie-breaker in Article 4 resolves it, why the UK's Statutory Residence Test and US citizenship-based taxation answer different questions, and why 'am I resident?' has several answers.
Learn moreRenouncing US Citizenship: The Process and the Tax Exit
What renouncing US citizenship involves — the consular process, the Form 8854 certification of five years of tax compliance, and how the covered expatriate and exit tax rules work. A factual guide, not a recommendation.
Learn moreMoving Between the US and UK
The months around a transatlantic move decide years of tax outcomes. What changes when you become resident in the other country, the pre-move steps that matter in each direction, and why timing income, gains and accounts is worth real money.
Learn moreUnsure how this applies to you?
Every cross-border situation is different. A consultation maps the rules onto your facts — before deadlines or elections make choices for you.
Or call +44 20 8064 3580 — we’ll tell you honestly whether you need help.