Tax & Residency guide
The UK Statutory Residence Test, explained
How HMRC determines UK tax residency: automatic overseas tests, automatic UK tests, the sufficient-ties test, and how as few as 16 UK days can trigger residency.
The UK has not used a simple 183-day rule since 2013. HMRC determines UK tax residency through the Statutory Residence Test (SRT) — a multi-pronged test that can establish residency with as few as 16 UK days for someone with strong UK ties, or rule it out completely even at 90+ days for someone genuinely working abroad.
The SRT runs in three stages, in order. Once a stage gives a definitive answer, the others don’t apply.
Stage 1: the automatic overseas tests
You are automatically non-UK-resident if any one of these is true:
- You were UK-resident in one or more of the previous 3 tax years, and you were in the UK for fewer than 16 days in the current tax year.
- You were not UK-resident in any of the previous 3 tax years, and you were in the UK for fewer than 46 days in the current tax year.
- You worked full-time overseas, you were in the UK for fewer than 91 days, and fewer than 31 of those were UK workdays (a UK workday is any day with more than 3 hours of work in the UK).
If you meet any of these, the SRT stops here. You are non-resident.
Stage 2: the automatic UK tests
If none of the automatic overseas tests applied, you are automatically UK-resident if any one of these is true:
- You were in the UK for 183 days or more in the tax year.
- Your only home (or all of your homes) was in the UK for 91 consecutive days or more, including at least 30 days in the tax year.
- You worked full-time in the UK for any 365-day period, with at least one day of that period in the tax year, and more than 75% of your workdays were UK workdays.
If you meet any of these, the SRT stops here. You are resident.
Stage 3: the sufficient-ties test
If neither stage gave a definitive answer, the SRT moves to the sufficient-ties test, which combines your UK day count with the number of “ties” you have to the UK.
The five UK ties
- Family tie. Your spouse, civil partner, common-law partner, or minor children are UK-resident.
- Accommodation tie. A place to live in the UK is available to you for 91+ consecutive days and you use it at least one night during the tax year (or 16 nights if it’s a close relative’s home).
- Work tie. You work in the UK for 40 or more days, doing more than 3 hours’ work per day.
- 90-day tie. You spent 90+ days in the UK in either of the previous 2 tax years.
- Country tie (applies only to leavers — people UK-resident in one or more of the prior 3 tax years). You spent more midnights in the UK than in any other single country in the tax year.
Combining ties with day counts
For someone leaving the UK (resident in one or more of the prior 3 tax years), all 5 ties are in play:
| UK days | Ties needed to be resident |
|---|---|
| 16 to 45 | 4 ties |
| 46 to 90 | 3 ties |
| 91 to 120 | 2 ties |
| 121 to 182 | 1 tie |
| 183+ | Automatic |
For someone arriving in the UK (not resident in any of the prior 3 tax years), only 4 ties apply (no country tie):
| UK days | Ties needed to be resident |
|---|---|
| 46 to 90 | All 4 ties |
| 91 to 120 | 3 ties |
| 121 to 182 | 2 ties |
| 183+ | Automatic |
The headline number people miss: a “leaver” with strong UK ties (family + accommodation + work + 90-day-history) can be UK-resident with just 16 days in the country.
How a UK “day” is counted
The SRT uses a midnight rule: a day counts as a UK day if you were present in the UK at the end of the day (midnight).
- Arrive evening of 1 July, depart morning of 3 July: 2 UK days (1 July and 2 July — present at both midnights).
- Pass through Heathrow on a Saturday-into-Sunday connection without clearing UK immigration: 0 UK days.
Transit exception: If your only purpose for being in the UK is to transit between two non-UK destinations and you don’t engage in any non-transit-related activity, that day does not count.
Exceptional circumstances: Up to 60 days per tax year can be disregarded for events beyond your control — major illness, natural disasters, family medical emergencies, travel disruption. Documentation required.
Split-year treatment
If you arrive in or leave the UK mid-year, you may qualify for split-year treatment — taxed as a resident only for part of the tax year. There are 8 split-year cases (3 for leavers, 5 for arrivers), each with specific conditions. The most common:
- Starting full-time work overseas (leaving the UK).
- Ceasing to have a UK home (leaving the UK).
- Starting to have a UK home (arriving).
- Starting full-time work in the UK (arriving).
Split-year treatment must be claimed correctly on your tax return — it isn’t automatic.
What changes when you’re UK-resident
UK residents are taxed on:
- All UK income.
- All foreign income on an arising basis by default (worldwide income).
- Non-domiciled residents (a rapidly-narrowing category — the regime has been heavily restricted from April 2025) could historically elect the remittance basis for foreign income, but the rules are now far less generous.
UK residents are also liable to UK Capital Gains Tax on worldwide gains and Inheritance Tax on their worldwide estate (subject to domicile rules).
Non-residents are taxed only on UK-source income and gains on UK-situs assets.
The biggest SRT mistakes
- Assuming “under 183 days means non-resident.” Wildly wrong for anyone with UK ties.
- Forgetting that the UK tax year runs 6 April to 5 April. The SRT operates on UK tax years, not calendar years.
- Counting nights instead of midnights inconsistently — the SRT explicitly uses midnight presence.
- Underestimating the family tie. A UK-resident spouse alone can be the difference between non-resident and resident.
- Not tracking workdays. A “UK workday” is a day with more than 3 hours of UK work — including emails answered while visiting family. Easy to undercount.
- Missing the “country tie” trap for leavers — if you spend more midnights in the UK than any other single country, that’s a tie, even if you’re nominally based abroad.
- Not claiming split-year correctly. The benefits exist but are easy to lose by misfiling.
Related reading
- What is tax residency? A foundation guide
- 183-day rule by country
- Avoiding accidental tax residency
- What counts as a day for visa and tax purposes — including the UK midnight rule
The SRT runs on midnight-presence counts you cannot reconstruct from memory after the fact. DaysAbroad logs every midnight automatically.