US-UK · Journal
The UK Statutory Residence Test, Step by Step
The Statutory Residence Test decides whether the UK can tax you. It does not touch your US filing duty. The three parts, in order, with the day counts.
The Statutory Residence Test decides whether the UK can tax you. It does not touch your US filing duty. The three parts, in order, with the day counts.
The Statutory Residence Test (SRT) settles one question: whether the UK may tax you for a given tax year. It does nothing to your US filing obligation, because the United States taxes its citizens on worldwide income wherever they live. You work the SRT to fix the UK side; the two answers together — American citizen, UK resident or not — decide which country gets primary taxing rights under the treaty and which one gives credit.
Most Americans in Britain arrive at the SRT with the wrong question: whether they are "resident in the UK or the US", as though the two were alternatives and winning one meant escaping the other.
They are not alternatives. US taxation of citizens does not depend on residence at all — the IRS is blunt that a citizen abroad is "subject to tax on worldwide income from all sources" and generally files on the same rules as someone living in Ohio, with an automatic two-month extension to 15 June. Nothing in UK law changes that.
The SRT answers the UK half. Get it wrong and the error compounds: a wrong UK conclusion produces a wrong foreign tax credit position on the 1040, in both directions, every year it survives. If you have come here from the familiar folklore, our piece on what actually triggers tax residence deals with that; this is the test itself.
1. Automatic overseas tests. Meet any one and you are not UK resident for the year. Stop.
2. Automatic UK tests. If no overseas test is met, meet any one of these and you are resident. Stop.
3. Sufficient ties test. Only if neither of the first two parts answers the year.
Running them out of order is the commonest technical mistake: an automatic overseas test can make you non-resident in a year when an automatic UK test would otherwise have caught you.
First test. You were UK resident in one or more of the three tax years immediately before this one, and you spend fewer than 16 days in the UK — 15 or fewer. It does not apply if you die in the year.
Second test. You were UK resident in none of the previous three tax years, and you spend fewer than 46 days in the UK.
Third test — full-time work abroad. The one that matters to people who have genuinely left. All of the following must hold:
That sounds generous until you add a monthly London board meeting, a fortnight at Christmas and a summer at the in-laws'. The 35-hour average is a computation, not an impression, and it is the limb that unravels under enquiry when there are no timesheets. An exclusion applies to people with a "relevant job" — certain cross-border transport roles with at least six qualifying trips in the year.
First test. You spend 183 days or more in the UK in the tax year. This is the real 183-day rule: not a ceiling you stay under, but a test that makes you resident once you cross it.
Second test — the UK home test. This catches people who kept the house. It is met where there is a period of at least 91 consecutive days, of which at least 30 fall in the tax year, throughout which you have a UK home where you spend a sufficient amount of time — and during that same period you either have no overseas home, or your overseas homes are ones you are present at on fewer than 30 days in the year.
"Sufficient time" means presence in that UK home on at least 30 days in the tax year, and HMRC's guidance is that the days need not be consecutive and any presence counts, however brief. Two traps follow. Multiple UK homes are tested separately, so four homes used 20 days each fail while one used 30 days meets it. And it is giving up the home abroad that usually triggers this test — once you do, a UK property you barely use can make you resident.
Third test — full-time work in the UK. Met where, over any 365-day period with all or part of it falling in the tax year, you work sufficient hours in the UK with no significant break; more than 75% of the days in that period on which you work more than three hours are days you work more than three hours in the UK; and at least one day in both the period and the tax year is a day of more than three hours' UK work. If one 365-day period fails the 75% test, another may be tried.
The 365-day period is what people miss: it is not the tax year and need not sit inside it, so a secondment beginning in February can make you resident for a year in which you spent very few days in Britain.
Almost every figure above is a day count, so the counting rules are not a footnote.
The midnight rule. A day counts if you are in the UK at the end of it. Land at 6am and leave at 11pm and the day does not count; land at 11pm and it does.
Transit. A day passing through the UK as a passenger between two places outside the UK does not count, provided you do nothing substantially unrelated to that passage.
Exceptional circumstances. Days you are in the UK because of exceptional circumstances beyond your control, where you intend to leave as soon as they permit, can be ignored — war, civil unrest, natural disaster, sudden life-threatening illness or injury are the statutory examples. The relief is capped at 60 days a year under paragraph 22(6); days beyond that count. HMRC stresses that whether circumstances are exceptional "will always depend on the particular facts". A cancelled flight is not a war.
The deeming rule. The anti-avoidance provision that catches the same-day commuter. It applies only if all three conditions are met: you were UK resident in at least one of the three previous tax years; you have at least three UK ties for the year; and you have more than 30 "qualifying days" — days you were in the UK but left before the end of the day. Past 30, every later qualifying day counts as a day spent in the UK. Usefully, the deeming rule is disregarded when deciding whether you have a 90-day tie.
If neither automatic part answers the year, day count is weighed against ties. There are five.
Everything now depends on which table you are in. Resident in any of the three previous tax years and you are a "leaver", with thresholds that bite far earlier. Otherwise you are an "arriver", with one fewer tie available because the country tie is closed to you.
The structure is a sliding scale: the more days you spend in the UK, the fewer ties it takes to make you resident. At the top of the range a single tie is enough; at the bottom, even several ties will not do it. Leavers are caught at materially lower day counts than arrivers throughout.
HMRC publishes the day bands themselves in RFIG20520, which it updated on 3 July 2026 to mirror Schedule 45 paragraphs 18 and 19. Read your own day count against that page rather than against any table reproduced elsewhere, and note that the statutory phrasing and the RDR3 guidance note express the same bands in different words — one counts in "more than / not more than" terms, the other in inclusive ranges. Boundary cases at the bottom of each range are decided earlier in the test and never reach the ties stage at all.
The asymmetry between the two columns is the part Americans most often miss. Someone who has been UK resident and then leaves can be pulled back into UK residence on a strikingly small number of days if enough ties survive the move — and a spouse still in Britain, a flat kept available, forty working days and the country tie adds up fast. Leaving properly means dismantling ties
Residence is a whole-year status, which is uncomfortable in the year you actually move. Split-year treatment can divide a UK-resident year into a UK part and an overseas part for most purposes. It is not elective and not a general fairness rule: you must fall within one of eight statutory cases.
Each case has its own conditions and its own rule for when the UK part begins or ends, and where more than one applies a priority order decides. Because the tax years do not align — 6 April to 5 April against the calendar year — the year of a move is where cross-border returns most often go wrong. We work through the sequencing in timing a move between the US and the UK.
Residence is also the gateway to the UK's regime for qualifying new residents on foreign income and gains, which replaced the old domicile and remittance basis rules — a separate analysis, better done before you arrive than after.
The United States taxes on citizenship, not residence. Becoming UK resident does not end your Form 1040 obligation, your FBAR obligation or your other information reporting. It changes what credits and exclusions you claim, not whether you file.
What the SRT does is set up the treaty analysis. Where you are resident in both countries under each one's domestic law, Article 4(4) of the UK-USA double taxation convention breaks the tie in a fixed order: a permanent home available to you; if both, the centre of vital interests; if that cannot be determined or there is no permanent home in either, habitual abode; then nationality; then mutual agreement between the competent authorities.
Then comes the provision that defeats the whole hope. Article 1(4), the saving clause, preserves each state's right to tax its residents and says a state "by reason of citizenship may tax its citizens, as if this Convention had not come into effect". Winning the tie-breaker for the UK therefore does not stop the US taxing you as a citizen. It allocates taxing rights and determines who credits whose tax — often decisive on the numbers, but not an exit. Our longer treatment of the treaty tie-breaker rules sets out what it does and does not achieve.
Every SRT threshold is a fact you may have to prove, and residence enquiries are won and lost on contemporaneous records rather than recollection. From the day you move, keep:
This is general information about how the SRT is structured, not advice on your position. Residence turns on precise facts — dates, homes, hours, the availability of accommodation — and small changes flip the answer. Anyone near a threshold, moving mid-year, claiming split-year treatment or relying on exceptional circumstances should have the position reviewed and documented before a return is filed.
The SRT rewards planning and punishes reconstruction. The useful work happens before a tax year starts: counting the days you can afford, deciding which ties you are willing to keep, and sequencing a move so split-year treatment is available rather than hoped for. It is also a US exercise, because the UK answer drives the credit position on the 1040.
We work both sides as US-UK tax specialists, model the UK and US outcomes together and prepare the returns, with an IRS Enrolled Agent who is also ACCA-qualified reviewing and signing off the filings. If you are near a threshold or moving this year, book a consultation.