Living in Britain with a green card: why the IRS still counts you as resident

Figures relate to tax year 2025 (US) / 2025-26 (UK)

A green card keeps you inside the US tax system wherever you live. Move back to Britain and let the card sit in a drawer, and the IRS still treats you as a resident. That means a full US return on your worldwide income, every year, until the status formally ends.

Most people who return to the UK assume leaving America settles the matter. It does not. So this guide explains why the status follows you and what you must file meanwhile. It then compares the three routes out, including one that can trigger an exit tax.

Key takeaways

• Holding permanent resident status at any point in a year makes you a US tax resident for that year.
• An expired card or a long absence does not end tax residence on its own.
• Formal abandonment on Form I-407 is the clean way to end the status.
• The UK treaty can treat you as non-resident, but it carries a serious trap for long-term holders.
• Holding the card in 8 of the last 15 years brings the US expatriation rules into play.

What is the green card test?

The green card test is the US rule that treats any lawful permanent resident as a tax resident. If you held that status at any time during the calendar year, you are a resident alien for that year. Where you actually live makes no difference to the test.

According to the IRS guidance on the green card test (opens in a new tab), the status continues until it is rescinded or judged abandoned. So the plastic card expiring changes nothing. Neither does a new British address, a UK job, or years spent away.

Immigration law and tax law also disagree here. A long absence may count as abandonment for immigration purposes. Yet for tax, the IRS generally treats you as resident until the status ends formally. That gap is exactly where people get caught.

The card in your drawer is not a souvenir. For the IRS, it is still a live tax status.

What must you file while the status continues?

Broadly, everything an American citizen abroad files. That means a Form 1040 reporting your worldwide income. You also need an FBAR if your UK accounts pass $10,000 in total, and Form 8938 above its own thresholds. British salary, savings interest and pension growth all come into scope.

Double tax is usually avoidable. The foreign tax credit lets you offset the income tax you pay in Britain. The foreign earned income exclusion can also help on the right facts. In practice, most returning Britons owe little or no US tax, but the filing duty remains.

The harder problems sit in the investments. ISAs are not tax-free in America, and UK funds can fall into the punitive PFIC regime. Our guide to the US UK tax treaty covers which reliefs survive and which the IRS ignores.

Can you use the foreign earned income exclusion?

Usually, yes. Resident aliens can use the physical presence test, which needs 330 full days abroad in any 12-month period. British nationals can generally use the bona fide residence test too, because the treaty extends it to citizens of treaty countries. For 2025 the exclusion limit is $130,000.

The exclusion suits some returning Britons, but not all. It blocks the foreign tax credit on the same wages, and it does nothing for savings or pension income. So we usually compare both routes before choosing one.

Pensions and ISAs need separate thought. Your UK workplace pension generally keeps its tax deferral under the treaty while you remain resident. ISAs do not, so interest and gains inside them are taxable in America each year, as our guide to the ISA and PFIC problem explains.

What are the three ways out?

You can abandon the status formally, claim treaty residence in the UK, or keep the card and keep filing. Each works, but each carries different consequences. The table below compares them before we look at the trap hidden inside the treaty route.

How does the treaty tie-breaker work?

The US UK treaty settles dual residence through a series of tests: permanent home, centre of vital interests, habitual abode, then nationality. If those point to Britain, you can claim US non-resident treatment. You do that by filing Form 1040-NR with a treaty disclosure.

That disclosure is Form 8833. Per the IRS guidance on Form 8833 (opens in a new tab), you use it to report a position that a treaty overrides normal US law. Leave it out, and the IRS can charge a separate penalty for the missing disclosure.

For someone who held the card only briefly, this route can work well. You still file Form 1040-NR each year while claiming it, so the paperwork does not disappear. For a long-term holder, however, it hides the most expensive trap in this entire area.

Why is the eight-year rule so dangerous?

Because a long-term resident who claims treaty non-residence is treated as having expatriated. You count as long-term once you have been a permanent resident in 8 or more of the past 15 tax years. Any part of a year counts as a full year, so the line arrives sooner than people expect.

Once you expatriate, the exit tax rules apply if you are a covered expatriate. That happens if your net worth reaches $2 million. It also happens if your average income tax liability passes $206,000 for 2025. Failing to certify five years of full compliance triggers it too.

The third test catches ordinary people. Someone with modest savings becomes a covered expatriate simply because earlier returns were missing. Our guide to renouncing US citizenship explains the exit tax itself, which works the same way for long-term residents.

How do you leave cleanly?

The order matters more than any single form. Getting compliant first protects you from the covered expatriate test, and the abandonment date then fixes where your US residence ends. This sequence keeps each step in the right place:

1. Count the years you held the green card, including any part-year.
2. Bring any missing US returns and FBARs up to date first.
3. Value your worldwide assets against the $2 million net worth test.
4. File Form I-407 with US immigration authorities to abandon the status.
5. File a final dual-status return for the year your residence ends.
6. File Form 8854 if you were a long-term resident.
7. Keep the abandonment confirmation with your permanent tax records.

Form 8854 is the expatriation statement. According to the IRS guidance on Form 8854 (opens in a new tab), long-term residents file it with the final-year return. That form is also where you certify the five years of compliance that keeps most people out of the exit tax.

A worked example

Take an illustrative example. A British nurse spent nine years in Boston as a permanent resident, then moved home to Leeds in 2023. She kept the card in case she ever went back, and she filed nothing in America after leaving. Her card expired in 2024, and she assumed that closed the file.

She remains a US tax resident for 2023, 2024 and 2025. Her NHS salary means the foreign tax credit would clear most US tax. But three returns and three FBARs are missing, and her UK workplace pension and savings sit inside that gap.

She has also held the card in at least eight of the last fifteen years. So a treaty claim or an abandonment now would make her an expatriate. Her missing returns would then make her a covered one. The fix is to get compliant first, then abandon, in that order.

Keeping the card as insurance

Many people keep the card in case they return to America one day. That choice has a real price. Every year you hold it adds to the eight-year count, and every year brings another full US return.

If a move back within two years is realistic, a re-entry permit protects the immigration status while you are away. The tax filings continue throughout, however. So weigh the cost of several years of US compliance against the value of keeping the door open.

For the nurse in our example, the first step is the streamlined procedure for the missing years. Only once her certification is secure does she file the I-407 and her final dual-status return.

The traps that catch green card holders abroad

These problems appear constantly among people who moved back to Britain. Each one feels reasonable at the time, which is why they last for years:

• Treating an expired card as the end of US tax residence.
• Keeping the card as a backup plan without budgeting for annual US filings.
• Claiming the treaty tie-breaker without counting the eight-year line.
• Abandoning the status before bringing missing returns up to date.
• Forgetting that a part-year with the card counts as a full year.
• Assuming ISAs and UK funds keep their tax-free status in America.

Where years have already slipped, the catch-up route matters. Our streamlined filing guide explains the main amnesty for non-wilful filers. It covers resident aliens as well as citizens.

What happens on the UK side?

Britain taxes you on your own rules, whatever your US status. Once the statutory residence test makes you UK resident, HMRC taxes your worldwide income. The US card changes nothing in that calculation, so both countries can claim you in the same year. The treaty and the foreign tax credit then decide which country keeps the tax.

Returning Britons sometimes gain a real advantage, though. From 6 April 2025, a new regime helps people arriving after ten consecutive years of non-residence. They can claim relief on foreign income and gains for their first four years. Our guide to the UK statutory residence test explains how HMRC counts your days.

How US UK Tax Accountants helps

We map your green card years, your filing history and your assets before recommending a route. Our treaty relief service covers the tie-breaker analysis, Form 8833, and the dual-status return for the year your residence ends.

In our practice the most valuable work happens before the I-407 goes in. Getting the sequence right keeps an ordinary saver out of the exit tax. We then set out the plan in writing with a fixed fee.

Plan your exit

If a green card still ties you to the IRS, a planned exit costs far less than a rushed one. Tell us how long you held the card and what you have filed since leaving. You can book a consultation and hear back within one working day.

Last reviewed 10 September 2026 by the US UK Tax Accountants Tax Team. This article is general information, not personal tax advice — speak to a qualified US/UK tax adviser about your own position.