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UK Statutory Residence Test calculator.

Enter your UK days and ties for a tax year. The calculator runs the automatic overseas test, the 183-day automatic test, and the sufficient-ties test, then tells you which one decides your residence and how much margin you have.

The calculator needs JavaScript to run. Everything else on this page, including the rules, the ties table, and the FAQ below, works without it.

Your year

Tax year

Days in the UK (midnights)

A day counts if you are in the UK at midnight. The year runs 6 April to 5 April.

Recent history

Leaver Arriver

Leaver: UK resident in at least one of the previous three tax years.

Your ties to the UK Family tie A spouse, partner, or minor child resident in the UK. Accommodation tie A place to stay available for 91 days or more, used at least one night, or 16 nights if it is a close relative's home. Work tie 40 days or more of over three hours of work in the UK. 90-day tie More than 90 days in the UK in either of the previous two tax years. Country tie More midnights in the UK than in any other single country. Leavers only.

Waiting for input

Enter your days and ties, then press Calculate.

Your margin insight appears here after you calculate.

Ties selected

Ties needed

Day band

Enter a day count to see your band.

Last updated: 2026-07-17. This is not legal or tax advice. It is a simplified model of the Statutory Residence Test. Confirm your position against HMRC's RDR3 guidance or a qualified advisor.

How your band decides it

Below 16 days a leaver is automatically non-resident, as is an arriver below 46. At 183 days you are resident automatically. Between those points, this is the number of ties it takes to make you resident. Your row highlights after you calculate.

Days in the UK	Arriver needs	Leaver needs
16 to 45	Non-resident	4 ties
46 to 90	4 ties	3 ties
91 to 120	3 ties	2 ties
121 to 182	2 ties	1 tie

What this tool does not cover

This is a simplified model. It does not compute the full-time work abroad or full-time UK work automatic tests, the only-home test, split-year treatment, the deeming rule for departure days, or exceptional circumstances. Days are counted as plain midnights. For any of those, read HMRC's RDR3 guidance or the UK Statutory Residence Test guide. This is general information, not legal or tax advice.

How the calculator decides your residence

The Statutory Residence Test is a cascade, and this tool runs it in the same fixed order HMRC uses. The automatic overseas test comes first. Fewer than 16 days as a leaver, or fewer than 46 as an arriver, and you are non-resident whatever your ties. Next the automatic UK test: 183 days or more and you are resident, again whatever your ties. Only when neither fires does the sufficient-ties test decide it, by weighing your ties against the day band you land in.

The counterintuitive part is that more days lower the bar. A leaver on 100 days needs 2 ties to be resident; the same leaver on 130 days needs only 1. That is why the calculator reports a boundary in both directions: the day count that flips your result, and the tie count that flips it.

Why ties matter as much as days

Two people can spend the identical 100 days in the UK and get opposite answers. The difference is ties. Each tie you hold moves you down one band, so a spouse in London or a flat kept available can turn a comfortable margin into residence. The calculator makes that visible: change a single tie and watch the verdict and the margin line change with it.

The country tie is the one that only applies to leavers. If you left the UK recently and still spend more midnights there than in any other single country, that counts against you. Arrivers never carry it, which is why the tool hides it when you pick Arriver.

What the margin line tells you

Most SRT calculators stop at a yes or no. This one adds the move that changes the answer. If you are non-resident, it names the day ceiling you can reach and the extra tie that would tip you over. If you are resident, it names the day cut and the tie you could drop to get back out. That is the line worth planning around, because the SRT rewards knowing your exact position before the tax year ends, not after.

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FAQ

SRT questions, answered.

For the full picture, read the Statutory Residence Test guide or check your own numbers in the calculator above.

How does the statutory residence test work?

It runs three checks in order over the UK tax year, 6 April to 5 April. First the automatic overseas tests can make you non-resident: fewer than 16 days as a leaver, or fewer than 46 days as an arriver, and you are out. Next, 183 days or more makes you resident automatically. Between those points the sufficient-ties test weighs your ties to the UK against your day count, and the more days you spend, the fewer ties it takes to make you resident.

How many days can I spend in the UK without becoming tax resident?

It depends on your ties and your recent history. With no ties you are safe up to 182 days, because 183 is the automatic line. With four ties, a leaver becomes resident from just 16 days, and an arriver from 46. Each tie you hold lowers your safe day count by one band, so the honest answer is a range, not a single number. The calculator above shows your exact ceiling.

What counts as a day under the SRT?

A day counts if you are in the UK at midnight, at the end of the day. So an arrival day usually counts and a departure day usually does not. A deeming rule can add midnight-free days back for recent residents with three or more ties who make many short visits, and pure transit days can be ignored. This tool uses the plain midnight count and treats the deeming rule as a caveat, not a calculation.

What are the sufficient ties?

There are five. The family tie: a spouse, partner, or minor child resident in the UK. The accommodation tie: a place to stay available for 91 days or more that you use at least once. The work tie: 40 days or more of over three hours of UK work. The 90-day tie: more than 90 UK days in either of the previous two tax years. The country tie: more midnights in the UK than in any other single country, which applies to leavers only.

What is the difference between an arriver and a leaver?

A leaver was UK resident in at least one of the previous three tax years. An arriver was not. Leavers are judged more strictly: they face lower day thresholds, they can be caught by the country tie, and four ties make them resident from as few as 16 days. Arrivers get kinder bands starting at 46 days and never carry the country tie.

Does the SRT apply to me if I work full-time abroad?

It does, but through a separate rule this tool does not compute. Full-time work abroad has its own automatic overseas test, with limits on UK days and UK workdays, and it can make you non-resident before the ties test is reached. Check the full conditions in HMRC's RDR3 guidance, because this calculator models the first automatic overseas test and the sufficient-ties test only.

Know your band before the tax year ends.

Staydays counts your UK midnights automatically and keeps the multi-year history the Statutory Residence Test depends on. You see the margin before it becomes a problem.

Download on theApp Store Read the Statutory Residence Test guide