Moving Back to the USA as a US/UK Dual Citizen: How Many Days Can You Spend in the UK?
A plain-English guide for US and British dual citizens returning to America: how many days you may spend in the UK each year and still be non-resident, using the Statutory Residence Test tie rules, with worked examples.
Kader Ameen · 8 August 2026 · 9 min read
You hold both a US and a British passport. After years in London you are moving back to the United States, probably for at least five years. You are keeping the flat in Clapham, the ISA you cannot use any more, and a pension. The question every client asks in the first ten minutes is the same one: how many days can I come back to the UK each year without becoming UK tax resident again?
The honest answer is: it depends on how many ties you keep. But it is a number, it is knowable in advance, and you can plan your travel around it. Here is how it works, in the simplest language we can manage.
Two systems, two different rules
As a US citizen you are taxed by the IRS on your worldwide income forever, wherever you live. Moving back to America does not change that; you were already filing Form 1040.
The UK is different. HMRC taxes you on your worldwide income only while you are UK resident. Once you become non-resident, HMRC generally only taxes your UK-source income — most commonly rent from a UK property. So the whole planning exercise is about becoming, and then staying, non-resident under the UK Statutory Residence Test (SRT).
The Statutory Residence Test in one page
The SRT is applied in three steps, in order:
- Automatic overseas tests. If you meet one, you are non-resident, full stop. The most useful for a leaver is working full-time overseas (broadly 35+ hours a week on average abroad) with fewer than 91 days in the UK and fewer than 31 UK workdays. There is also a test for people who spend fewer than 16 days in the UK having been resident in one of the previous three tax years.
- Automatic UK tests. 183 days or more in the UK in the tax year makes you resident, whatever else is true. There are also tests for having a UK home and for full-time work in the UK.
- The sufficient ties test. If neither of the above settles it, you count your ties to the UK and read your day limit off a table.
The five ties
- Family tie — spouse, civil partner, cohabiting partner, or minor children resident in the UK.
- Accommodation tie — a place available to you in the UK for 91 continuous days or more, in which you spend at least one night.
- Work tie — 40 or more UK workdays (a workday is more than three hours of work).
- 90-day tie — more than 90 days in the UK in either of the two previous tax years.
- Country tie — applies only to leavers: the UK is the country where you spend the most midnights.
A leaver is someone who was UK resident in one or more of the three previous tax years. In your first three years in America you are a leaver, so all five ties can apply to you and the limits are tighter.
The number you actually want: day limits for leavers
| UK ties | Days you may spend in the UK and stay non-resident |
|---|---|
| 4 or more | Fewer than 16 days |
| 3 | Fewer than 46 days |
| 2 | Fewer than 91 days |
| 1 | Fewer than 121 days |
| 0 | Fewer than 183 days |
A "day" is normally a day on which you are in the UK at midnight. Fly out before midnight and, as a general rule, that day does not count — though there is an anti-avoidance "deeming rule" for people with three or more ties who have many days in the UK without being here at midnight.
Worked example: Sarah, London to Boston
Sarah is a US/UK dual citizen. She leaves London on 30 September 2026 and starts a job in Boston on 12 October 2026. She keeps her Clapham flat and lets it out on a 12-month tenancy from 1 November. Her adult children live in the US. Her husband moves with her.
Tax year 2027/28 (her first full year abroad):
- Family tie? No — husband and children are in the US.
- Accommodation tie? No, because the flat is let commercially on a normal tenancy and is not available to her. (If she kept a room, or the tenancy allowed her to stay, this would flip to yes.)
- Work tie? No — she does not work in the UK.
- 90-day tie? Yes — she was in the UK more than 90 days in 2026/27.
- Country tie? No — she spends most midnights in the US.
One tie, so Sarah can spend up to 120 days in the UK in 2027/28 and remain non-resident. That is four weeks at Christmas, a fortnight at Easter and a long summer, comfortably.
Now change one fact. Suppose Sarah keeps the Clapham flat empty for her own use. That is an accommodation tie. Two ties, and her limit drops to 90 days. Add a UK consultancy with 40+ workdays and she is at three ties and 45 days. The same life, planned differently, costs her 75 days a year.
After three years abroad it gets easier
Once you have been non-resident for three complete tax years you stop being a "leaver" and become an "arriver" for SRT purposes. The country tie no longer applies, and the day limits are more generous: with two ties an arriver may spend up to 120 days, and with one tie up to 182.
This is one reason we tell clients to think in terms of at least five years. The residence picture settles, and — as the companion articles in this series explain — capital gains and inheritance tax exposure also improves the longer you are genuinely gone.
Traps that catch returning Americans
- Counting calendar years. The UK tax year runs 6 April to 5 April. Your day count resets on 6 April, not 1 January.
- Forgetting exceptional circumstances. Up to 60 days may be ignored for genuinely exceptional circumstances (serious illness, national emergencies). It is narrow — do not build a plan on it.
- Assuming the treaty rescues you. The US/UK treaty tie-breaker can allocate residence to the US, but it does not stop you being UK resident under domestic law, and it does not remove your UK filing obligations. It is a fallback, not a plan.
- Ignoring the year of departure. That year is usually handled by split-year treatment, which is the subject of the next article.
What we do for returning dual citizens
We prepare both sides: the US Form 1040 with foreign tax credits and any remaining UK-source reporting, and the UK Self Assessment return with the residence pages. We produce a written day-count budget for each tax year so you know, before you book flights, exactly how many nights you have left.
Consultations are £150 for 30 minutes, and if you then instruct us we quote a fixed fee in writing based on the complexity of your case.
