Green Card Holders Abroad: US Tax Residency That Travels With You

The rule: the card is the residency

US tax law treats a lawful permanent resident — a Green Card holder — as a US tax resident under the green card test, and that status does not depend on where you live or how often you visit. Move to London, stay a decade, let the physical card expire in a drawer: for the IRS you remain a US resident, taxable on worldwide income and subject to the full reporting apparatus — annual returns, the FBAR, Form 8938 and the rest — exactly like a citizen abroad.

The status ends for tax purposes only when it formally ends: abandonment on Form I-407, revocation, or a final administrative or judicial determination. Nothing about the passage of time, distance or card expiry does the job. This is the single most common misunderstanding we see among former US residents in the UK, and it quietly accrues unfiled years.

Living abroad with a Green Card

A Green Card holder in the UK usually files in both systems: UK Self Assessment or PAYE as a UK resident, and a US Form 1040 reporting the same worldwide income. The same double-tax machinery available to citizens applies — foreign tax credits, the foreign earned income exclusion — and in a high-tax country like the UK most holders owe the US little or nothing. The obligations that bite are the reporting ones, because they carry penalties unrelated to tax due.

There is also a tension citizens never face: immigration law expects a permanent resident to actually reside in the US. Extended absence can lead immigration authorities to treat the card as abandoned even while tax law still counts you as resident. The two systems disconnect precisely when you move abroad, and they fail in opposite directions.

The treaty tie-breaker: relief with a price tag

Where the US–UK treaty's residence tests point to the UK — permanent home, centre of vital interests — a Green Card holder can in principle claim to be treated as a UK resident under the treaty, filing US tax as a nonresident for the year. Tempting, but three warnings come attached:

• Immigration risk. Claiming to be a treaty resident of another country is difficult to reconcile with maintaining permanent-resident intent, and can count against keeping the card.
• Reporting survives. The claim (made on Form 8833 with a nonresident return) changes how income is taxed, not the underlying status — information-reporting duties generally continue.
• Expatriation risk. For a long-term resident, starting to be treated as a resident of a treaty country can itself constitute expatriation — triggering the exit tax rules without any I-407 ever being signed.

That last point deserves emphasis: tie-breaker claims by long-standing Green Card holders are one of the classic ways people stumble into the exit tax by accident.

Giving the card back: I-407 and Form 8854

Formally abandoning permanent residence is done on Form I-407, filed with USCIS. Tax residency then generally ends, and the final-year US filings record the transition.

For a long-term resident — someone who held the card in at least eight of the fifteen tax years ending with the year of abandonment — the expatriation rules apply on top, the same regime that covers citizens who renounce. Form 8854 must be filed, and if you are a covered expatriate — by exceeding the net worth or average tax liability thresholds on the IRS's expatriation pages, or by failing to certify five years of full tax compliance — a mark-to-market exit tax treats most worldwide assets as sold at fair value the day before expatriation, with tax on the deemed gain above an inflation-adjusted exclusion.

The practical takeaway

A Green Card abroad is a choice with a running cost: full US filing obligations for as long as you keep it, and an exit-tax gauntlet if you keep it too long before letting go. Whether the right answer is keeping the card compliantly, claiming treaty relief with eyes open, or a planned, certified exit depends on facts worth establishing precisely — years held, assets, filing history — before any form goes in.