Statutory Residence Test Explained: Automatic Tests, Ties and Day Counts

The Statutory Residence Test explained in one sentence: it is a three-stage statutory test that decides whether you are UK resident for a tax year, working through the automatic overseas tests, then the automatic UK tests, then the sufficient ties test. Feeling settled has nothing to do with it. Day counts and defined connections do.

The test has applied since 6 April 2013, and each tax year stands alone. You can be UK resident one year and not the next. For Americans, the answer decides whether HMRC taxes your worldwide income at all, which in turn decides what your UK Self Assessment return and your US return each have to show.

The Statutory Residence Test explained: three stages, in order

The order matters, because the test stops as soon as it has an answer.

1. Automatic overseas tests. Meet any one of these and you are not UK resident for the year. Nothing further is considered.
2. Automatic UK tests. If no overseas test applies, meeting any one of these makes you UK resident.
3. Sufficient ties test. If neither set settles it, your day count is weighed against your UK connections.

People often jump to the ties test because it is the part they have heard about. That is the wrong way round, and it produces wrong answers for anyone who already qualifies under an automatic test.

Stage one: the automatic overseas tests

HMRC's RDR3 guidance note sets out the automatic overseas tests. You are not UK resident for the tax year if you:

• spend fewer than 16 days in the UK in the tax year, having been UK resident in one or more of the previous three tax years; or
• spend fewer than 46 days in the UK in the tax year, having not been UK resident in any of the previous three tax years; or
• work abroad full-time, averaging at least 35 hours a week, and spend fewer than 91 days in the UK, of which no more than 30 are spent working.

The gap between 16 and 46 days is the thing to notice. A person who has just left the UK is held to a much tighter limit than someone who has never lived here, and that asymmetry runs through the whole test.

Stage two: the automatic UK tests

If no overseas test applies, you are automatically UK resident if you:

• spend 183 days or more in the UK in the tax year;
• have your only home in the UK for 91 days or more in a row, and visit or stay in it for at least 30 days of the tax year; or
• work full-time in the UK for any period of 365 days, with at least one day of that period falling in the tax year you are checking.

The 183-day figure is the one everyone knows, and it is also the one that misleads. Plenty of people become UK resident well below 183 days through the home test or the ties test, which is why counting to 182 and stopping is not a strategy.

Stage three: the sufficient ties test

The ties test balances days against connections. HMRC's manual at RFIG20520 sets out how many ties make you resident at each day count, and the answer differs depending on your recent history.

If you were UK resident in one or more of the previous three tax years

Days spent in the UK	UK ties needed to be resident
More than 15 but not more than 45	At least 4
More than 45 but not more than 90	At least 3
More than 90 but not more than 120	At least 2
More than 120	At least 1

If you were not UK resident in any of the previous three tax years

Days spent in the UK	UK ties needed to be resident
More than 45 but not more than 90	All 4
More than 90 but not more than 120	At least 3
More than 120	At least 2

The ties themselves

Four ties apply to everyone. The fifth, the country tie, is only considered by people who were UK resident in one or more of the three preceding years.

Tie	When you have it
Family	Your husband, wife or civil partner (unless separated), your partner if living together as such, or your child under 18 is UK resident. There is no family tie with a child under 18 if you spend time with them in person in the UK on fewer than 61 days in the year.
Accommodation	You have a place to live in the UK available for a continuous period of 91 days or more in the year and spend at least one night there, or 16 or more nights if it is a close relative's home.
Work	You do more than three hours of work a day in the UK on at least 40 days in the year. The days need not be consecutive.
90-day	You spent more than 90 days in the UK in either or both of the two previous tax years.
Country (leavers only)	The UK is the country in which you were present at midnight for the greatest number of days in the tax year.

Illustrative example: an American who left London in June 2025 and moved to New York was UK resident in the previous three years, so she is a leaver. She returns for 80 days in 2026/27 to see family and work. Her husband stays UK resident, giving her a family tie; she keeps a flat available all year, giving an accommodation tie; and she worked more than three hours a day on 45 of those days, giving a work tie. At 80 days a leaver needs at least three ties, and she has three. She is UK resident for that year despite spending fewer than 90 days here.

What counts as a day spent in the UK?

HMRC's rule at RFIG20710 is the midnight test: a day counts as a day spent in the UK if you are in the UK at the end of the day. If you are not present at the end of the day, that day does not count. A morning flight into London and an evening flight out is usually not a UK day at all.

That rule is subject to the deeming rule, set out at RFIG20720. It applies where you were UK resident in one or more of the three previous tax years, have at least three UK ties for the year, and were present in the UK on more than 30 days without being here at the end of the day. Those are called qualifying days, and once you pass 30 of them, every later qualifying day in the year is treated as a day spent in the UK.

The deeming rule exists to catch the commuter pattern: flying in for the working day and out again each evening. Anyone running a tight day count on same-day trips needs to test it before relying on the midnight rule alone.

What happens if you are stuck in the UK unexpectedly?

Days spent in the UK because of exceptional circumstances beyond your control can be left out of some day counts. HMRC's guidance at RFIG22240 gives local or national emergencies, civil unrest, natural disasters, the outbreak of war and a sudden serious or life-threatening illness or injury as examples of circumstances likely to be exceptional.

Two limits matter. You must intend to leave the UK as soon as the circumstances permit, and HMRC will usually treat actually leaving once they end as evidence of that intention. And the maximum number of days that can be ignored in a tax year is 60. The relief also does not apply to every day-counting test, so it is not a general escape hatch.

Why the Statutory Residence Test matters more for Americans

For most people, the test decides one thing: whether HMRC taxes their worldwide income. For a US citizen it decides something narrower but more consequential, because the IRS taxes you on worldwide income from all sources regardless of where you live. You cannot leave the US net by leaving the country, so the question is never whether you are taxed, but by how many countries and in what order.

Three consequences follow. Your UK residence status determines whether a UK return is needed at all, which is where our guide to whether you need to file Self Assessment starts. Where both countries treat you as resident, the treaty's tie-breaker rules decide which claim prevails for treaty purposes. And the arrival or departure year raises split-year treatment, which turns on the same dates you are already counting.

What the test does not decide

The Statutory Residence Test answers one question: were you UK resident for this tax year, yes or no. Several things people expect it to settle sit outside it.

• Whether part of the year is excluded. Residence is a whole-year status. Where you arrive or leave partway through, split-year treatment can take the overseas part out of UK tax, but that is a separate set of cases claimed on the return, not an output of the test itself.
• How your foreign income is taxed. Being UK resident normally brings worldwide income into charge, but a recent arriver may be able to claim the four-year foreign income and gains regime, which changes the answer without changing your residence status.
• Which country wins when both claim you. The test can make you UK resident in a year the US also treats you as resident. Only the treaty resolves that, and only for treaty purposes.
• Where you are domiciled. Domicile is a separate concept with its own rules, and it still matters for inheritance tax even though it no longer drives the income tax treatment of new arrivals.

In an arrival or departure year all four of these usually land at once, which is why the first and last UK returns take longer than the ones in between.

What people get wrong

Counting to 183 and assuming they are safe

The ties test can make someone resident on 46 days. The 183-day test is the last line of defence, not the first.

Reconstructing day counts years later

The test runs on evidence: boarding passes, passport stamps, calendars and payroll records. HMRC can ask, and a count assembled from memory rarely survives. Keep a contemporaneous log of arrival and departure dates, including which nights you were here at midnight.

Forgetting that ties change mid-year

A partner moving to the UK, a lease signed, or a run of UK working days can add a tie you did not have in April. Ties are tested for the year, so a decision in October can change the whole year's answer.

Treating a same-day trip as free

It usually is, under the midnight rule. Once the deeming rule bites, it is not.

Getting the residence position documented

US/UK Cross Border Tax is US CPAs and UK tax advisers working as one team, with offices in London, Manchester, New York and San Francisco. We work the test in the order HMRC applies it, document the day counts and ties behind the conclusion, and carry the same dates through to the US return so both sides tell one story.

If you want the Statutory Residence Test explained against your own year, see our UK Self Assessment service, read how we work with Americans living in the UK, or get in touch with your travel dates and we will tell you where you stand.