UK Statutory Residence Test
Are you a UK resident for tax purposes, or not? HMRC answers it using a detailed set of rules known as the Statutory Residence Test, or SRT for short. Strangely this means that, technically, every person in the world is subject to the test, even of they are not aware of it.
The SRT can give a clear answer as to whether you are UK resident. It can therefore also be used to determine how to ensure you are not UK resident. However, the rules have a lot of moving parts, and getting them wrong can be costly.
Three steps
The SRT works has three steps that run through in turn. These steps are:
Automatic Overseas Test — does this confirm you are not UK resident?
Automatic UK Test — does this confirm you are UK resident?
Sufficient Ties Test — if neither of the above is conclusive, this step looks at your connections to the UK to determine your status.
As soon as one of them is met, the test stops.
Step 1: The Automatic Overseas Test
This first test identifies people who are clearly not UK residents. There are five tests here, but two of them only apply if someone has died during the tax year, so we'll leave those aside. The three that matter in everyday cases are:
Few visits. You spent fewer than 16 days in the UK, and you were UK resident in at least one of the previous three tax years.
New arrival, limited time. You spent fewer than 46 days in the UK, and you weren't UK resident in any of the previous three tax years.
Full-time work abroad. You put in enough hours working overseas (essentially a full-time job abroad), with only limited trips back to, or workdays in, the UK.
If you meet any one of these, you are treated as not UK resident for the year, and no further steps are needed.
Step 2: The Automatic UK Test
If you do not meet any of the automatic overseas tests, the next step is the Automatic UK Test. Meeting any one of the following (excluding the test that applies if someone dies during the year) means you are UK resident for the tax year:
The 183-day rule. You spent 183 days or more in the UK during the tax year. In practice, this is worth checking first, since meeting it makes it impossible to have met any of the automatic overseas tests.
The 30-day home rule. You have a UK home available to you for 91 days in a row or more (with at least 30 of those days falling in the tax year), you actually used that home for more than 30 days in the year, and either you have no home overseas, or you spent fewer than 30 days in any overseas home during the year.
Working full-time in the UK. You work full-time in the UK for any 365-day stretch that overlaps with the tax year (with no significant breaks, and a few other conditions attached).
If none of the above apply either, the third test — the Sufficient Ties Test — is used to determine your residence status.
Step 3: The Sufficient Ties Test
If the first two steps do not give a conclusive answer, this step looks at your ties to the UK — the connections you still have to the country — alongside your residence history and the number of days you have spent here.
There are five ties to consider:
Family tie — your spouse, civil partner, cohabiting partner, or minor child is UK resident.
Accommodation tie — you have UK accommodation available for more than 90 consecutive days in the year, and you spend at least one night there. Staying at a close relative's home can still count against you here, unless it's fewer than 16 nights a year.
Work tie — you work in the UK for more than three hours a day on at least 40 days in the year. HMRC's definition of "work" is strict here — with it including travelling and training time.
90-day tie — you spent more than 90 days in the UK in at least one of the previous two tax years.
Country tie — only relevant if you were UK resident in one of the previous three years: this tie applies if the UK is the single country where you spent the most days in the tax year.
The more ties you have, the fewer days you are allowed to spend in the UK before you become UK resident. The exact day-count thresholds depend on how many ties you have and your residence history, so this part of the test needs to be calculated for your specific circumstances.
Counting your UK days
Counting days is not always as simple as it sounds:
A day generally counts as a UK day if you're in the UK at midnight (with some exceptions, like passing through on a connecting flight).
Days you leave the UK usually don't count — unless the "deeming rule" kicks in.
The deeming rule applies if you were UK resident in one of the previous three years and you have at least three UK ties this year. If it applies, it caps the number of departure days you can exclude at 30.
Split year treatment
Normally, you're either UK resident for the whole tax year or you're not — there's no in-between. But if you move to or from the UK partway through a tax year, split year treatment might let part of that year be treated as "overseas" for tax purposes, with the rest treated as UK resident.
Whether split year treatment applies — and exactly where the line falls — depends on a detailed set of conditions, so this needs careful checking rather than assuming it automatically applies.
The takeaway
At a glance, the SRT looks like three simple steps. In practice, it's a test where the details are crucial— a few days here or there, or one extra tie to the UK, can change your residence status entirely. If your situation isn't completely clear-cut, it's well worth getting it properly checked rather than guessing.