The Statutory Residence Test (SRT) is the set of rules that decides, definitively, whether you are UK tax resident in a given tax year. It works through three stages in strict order — automatic overseas tests, automatic UK tests, then a "sufficient ties" test that combines your day count with your connections to the UK. Since April 2025, when the foreign income and gains regime replaced the old non-dom rules, residence has carried even more weight: it is now the single hinge on which UK taxation of worldwide income turns.
The test is mechanical, which is its virtue and its trap. There is no "I consider myself non-resident"; there is a day count, a set of definitions, and an answer. Here is how it actually runs.
Stage one: the automatic overseas tests
Check these first — pass any one and you are non-resident for the year, full stop:
- You spend fewer than 16 days in the UK (having been UK resident in one of the previous three years), or
- fewer than 46 days, if you were not resident in any of the previous three years, or
- You work full-time overseas with fewer than 91 UK days, fewer than 31 UK workdays, and no significant break of 31 days or more from the overseas work.
The full-time-work-abroad test is the workhorse for expats on foreign contracts, and its conditions are stricter than they look — a UK workday is any day with more than three hours of work done here, and a few laptop-open days at the family home add up faster than people expect.
Stage two: the automatic UK tests
If no overseas test applies, these make you resident automatically:
- 183 days or more in the UK — the one everyone knows, and genuinely conclusive: there is no arguing your way out of 183 days;
- The only-home test — broadly, you have a UK home for a spell of 91-plus consecutive days (at least part of it in the tax year), are present in it on 30 or more days, and any overseas home is one you are present in on fewer than 30 days that year;
- Full-time UK work over a 365-day period with more than 75% of workdays in the UK.
The only-home test is the quiet one. Someone who sells their foreign house mid-move and keeps a London flat can become UK resident on a fraction of 183 days.
Stage three: sufficient ties — where the real planning lives
Nothing automatic applying, residence comes down to how many UK "ties" you have against how many days you spent here — with meaner thresholds for leavers (resident in any of the previous three years) than arrivers:
- Leavers: 16–45 days — resident with 4 ties; 46–90 days — 3 ties; 91–120 days — 2 ties; 121–182 days — just 1 tie
- Arrivers: 46–90 days — resident only with all 4 ties; 91–120 days — 3 ties; 121–182 days — 2 ties
The ties, precisely: a UK-resident spouse, partner or minor child (family); UK accommodation available to you for a continuous period of at least 91 days in the year and used for at least one night (16 nights where it is a close relative's home); work — 40 or more UK days on which you did over three hours' work; the 90-day tie — more than 90 days spent in the UK in either of the two prior tax years (exactly 90 does not count); and, for leavers only, the country tie — the UK having the greatest (or joint-greatest) number of your midnights of any country that year. The asymmetry is deliberate: someone who has just left with a house, a spouse here and a history of UK presence can hold as few as 45 days a year. HMRC's full guidance is in RDR3.
Counting days properly
A UK day is one where you are here at midnight. Transit days can escape; a deeming rule catches some frequent leavers who routinely arrive and depart same-day; and days you could not leave because of exceptional circumstances — serious illness, a travel shutdown — can be disregarded, but only up to 60 days, only while the circumstance genuinely prevents departure, and only for the specific tests to which the disregard applies — it is not a universal deduction from every count. The 60-day cap is absolute, as many discovered during the pandemic. Keep travel evidence: boarding passes, stamps, a calendar kept at the time. Residence enquiries are won and lost on contemporaneous records.
Split years and the five-year rule
Residence is normally all-or-nothing for a tax year, but eight split-year cases divide a year into resident and non-resident parts when you leave or arrive partway through — starting full-time work abroad, ceasing a UK home, coming back. The conditions are precise and not elective; you fall into a case or you do not.
And for anyone leaving with an eye on tax: the temporary non-residence rules claw back the advantage if you return too soon. They apply to people who were UK-resident in at least four of the seven tax years before departure and are non-resident for five years or less — in which case gains realised and certain income drawn while away are taxed in the year of return. Selling the company from Dubai only works if Dubai lasts (and even then, treaty positions and the FIG rules shape the final answer — residence is the hinge, not the whole door).
Certificates of residence: proving it to the other side
Being UK resident has a flip side — claiming treaty relief abroad usually requires proving UK residence to a foreign tax authority with a certificate of residence from HMRC. Applications go through an online service (agents can apply for clients) and need the treaty country, the income type and period, and confirmation you are beneficial owner of the income; where no return has been filed, HMRC will want your day-count position too. Build in lead time — foreign payers withhold at full rates until the certificate lands on their desk.
Where this goes wrong in practice
The failures we see are rarely exotic. A leaver keeps the family home "available" and doesn't count it as a tie. Workdays get under-counted because emails at the kitchen table don't feel like work. The country tie is forgotten entirely. Or the plan was sound and the records are missing. The SRT rewards people who run the test prospectively — decide the residence outcome you need, derive the day budget and tie positions that deliver it, and live inside them — rather than reconstructing the answer at filing time.
If your position is borderline, or a move is coming either direction, this is squarely what our expat tax and international tax teams do — including split-year planning, certificate applications and, when HMRC asks questions, the enquiry itself.