UK Statutory Residence Test (SRT): How It Works
The Statutory Residence Test (SRT) is the framework HMRC uses to determine whether you are UK-resident for tax purposes. Being UK-resident means you owe UK tax on your worldwide income; non-residents owe UK tax only on UK-source income. The SRT is complex, it involves automatic tests, tie-breaker rules, and split-year provisions, but understanding it is essential for anyone leaving the UK, arriving in the UK, or spending significant time in both.
The Automatic Overseas Tests
If you pass any Automatic Overseas Test, you are definitively non-UK-resident regardless of any other factors. The three main tests: (1) You were not UK resident in all of the previous three tax years and you spend fewer than 46 days in the UK in the current year. (2) You were UK resident in one or more of the previous three years but spend fewer than 16 days in the UK. (3) You work full-time abroad (averaging at least 35 hours per week) with fewer than 91 UK days and fewer than 31 UK workdays. These are bright-line tests, if you pass one, the analysis stops: you're non-resident.
The Automatic UK Tests
Conversely, certain conditions automatically make you UK-resident: (1) You spend 183 or more days in the UK in the tax year. (2) You have only one home and it is in the UK (with certain conditions on time spent there). (3) You work full-time in the UK for 365 days. If any automatic UK test is met, you're UK-resident regardless of other factors.
The Sufficient Ties Test
If you pass neither set of automatic tests, the Sufficient Ties Test applies. Your UK tax residency depends on how many UK ties you have (family tie, accommodation tie, work tie, 90-day tie, country tie) and how many days you spend in the UK. More ties mean fewer days are needed to become UK-resident. For example, someone with 4+ ties becomes UK-resident if they spend more than 16 days in the UK; someone with no ties remains non-resident up to 182 days.
Split-year treatment
If you move to or from the UK mid-year, split-year treatment may apply, dividing the tax year into a UK-resident period and an overseas period. There are 8 'cases' of split-year treatment, each with specific conditions. Getting the right case applied matters: it determines exactly when your worldwide income starts/stops being taxable in the UK. Split-year treatment is claimed through the SA109 supplementary pages in your Self Assessment return.
Day-counting rules
A 'day in the UK' for SRT purposes is any day where you are in the UK at midnight. Arriving in the UK in the morning and leaving before midnight doesn't count as a day. However, there are transit exceptions (passing through without leaving the international zone) and temporary presence exceptions (due to exceptional circumstances like illness). Keeping a detailed travel diary is strongly recommended for anyone close to relevant day thresholds.
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Frequently asked questions about UK Statutory Residence Test (SRT): How It Works
How many days can I spend in the UK without becoming UK-resident?
It depends on your circumstances. With no UK ties, up to 182 days. With 4+ ties, as few as 17 days can make you UK-resident. The Automatic Overseas Tests also matter, if you worked full-time abroad with fewer than 91 UK days, you're definitively non-resident even with ties.
What counts as a 'day in the UK' for SRT?
Any day where you are present in the UK at midnight, subject to exceptions for transit and exceptional circumstances. Days of arrival in and departure from the UK count differently in different contexts, the Automatic Overseas Work Test doesn't count departure days as UK days, for instance.
I left the UK mid-year, does split-year treatment apply automatically?
No. Split-year treatment must be claimed on your Self Assessment return using the SA109 pages. If you don't claim it, HMRC will treat you as UK-resident (or non-resident) for the full year. The conditions for each case of split-year treatment must be carefully assessed.
What are 'UK ties' in the Sufficient Ties Test?
UK ties include: a family tie (UK-resident spouse, partner or minor child), accommodation tie (accessible accommodation in the UK used during the year), work tie (UK work for at least 40 days), 90-day tie (more than 90 UK days in either of the previous two years), and country tie (UK is the country where you spent most time in the year, only applies to those who were previously UK-resident).