UK tax residency for any tax year is determined by the Statutory Residence Test (SRT) — a structured set of automatic and sufficient-ties tests based on days spent in the UK, where you work, where your home is, and the strength of your wider UK connections. Becoming non-UK tax resident isn’t a matter of intention or paperwork; it’s the outcome of how the SRT applies to your year. Getting this wrong can leave you taxable in the UK on your worldwide income for an entire tax year you thought you’d already left behind.
This guide explains how the SRT works in practice, what counts as a UK day, the role of split-year treatment, what to file with HMRC when you leave, and the currency considerations that follow once you’re non-resident. For country-specific tax interaction with the UK, see our country relocation guides for Spain, France, Portugal, Dubai and Australia.
The Statutory Residence Test in 60 Seconds
The SRT applies in three stages, in this order. The first one that gives a definitive answer is the answer.
- Automatic Overseas Tests — if any one applies, you are automatically non-UK resident for that tax year.
- Automatic UK Tests — if any one applies (and no Automatic Overseas Test did), you are automatically UK resident for that tax year.
- Sufficient Ties Test — if neither set above applies, your residence depends on the combination of UK days and your number of “ties” to the UK.
The UK tax year runs from 6 April to 5 April. Days are counted by reference to whether you were in the UK at midnight on each day.
The Automatic Overseas Tests
You are automatically non-UK resident for a tax year if any one of these applies:
- You spent fewer than 16 days in the UK in the tax year, and you were UK resident in one or more of the previous three tax years.
- You spent fewer than 46 days in the UK in the tax year, and you were not UK resident in any of the previous three tax years.
- You worked full-time overseas during the tax year (with detailed conditions on hours, gaps and UK workdays), spent fewer than 91 days in the UK, and worked fewer than 31 UK workdays of three hours or more.
The third test is the most heavily used by working-age expats and the one with the most detailed conditions — the workday and overseas-employment definitions matter, and HMRC’s RDR3 guidance contains the precise rules.
The Automatic UK Tests
You are automatically UK resident if no Automatic Overseas Test applies and any one of these does:
- You spent 183 days or more in the UK in the tax year.
- Your only home was in the UK for at least 91 consecutive days, of which at least 30 fell within the tax year, and you spent at least 30 days there in the tax year.
- You worked full-time in the UK for any 365-day period, with at least one day of that period falling within the tax year (subject to detailed conditions).
Death in the UK during the tax year has its own automatic test, and there are nuances for the year of death.
The Sufficient Ties Test
If none of the automatic tests gives an answer, your UK residence depends on combining the number of days you spent in the UK with the number of “ties” you have to the UK. The five UK ties are:
- Family tie — your spouse, civil partner or minor child is UK resident.
- Accommodation tie — you have a place to live in the UK that’s available to you for at least 91 consecutive days, and you spend at least one night there in the tax year (with a higher threshold for close-relative properties).
- Work tie — you do substantive work in the UK on at least 40 days in the tax year (a UK workday is three hours or more).
- 90-day tie — you spent more than 90 days in the UK in either of the previous two tax years.
- Country tie — you spent more days in the UK than in any other single country (this tie applies only to “leavers” — those who were UK resident in any of the previous three tax years).
The day-count thresholds at which you become resident depend on whether you’re an “arriver” (not UK resident in any of the previous three tax years) or a “leaver” (UK resident in at least one of those years). The thresholds are tighter for leavers — in other words, leaving the UK is harder than arriving, and freshly-emigrated UK nationals need to be especially careful in their first year out.
| Days in UK | Arriver — ties needed for residence | Leaver — ties needed for residence |
|---|---|---|
| Fewer than 16 | Always non-resident (auto test) | Always non-resident (auto test) |
| 16–45 | Always non-resident | 4+ ties |
| 46–90 | 4 ties | 3+ ties |
| 91–120 | 3 ties | 2+ ties |
| 121–182 | 2 ties | 1+ ties |
| 183 or more | Always UK resident (auto test) | Always UK resident (auto test) |
What Counts as a UK Day?
The default rule: you were in the UK on a day if you were here at midnight at the end of that day. Two important exceptions:
- Transit days — if you arrive in the UK in transit to another country, leave the next day, and don’t conduct business in the UK, the day doesn’t count.
- Exceptional circumstances — days spent in the UK due to exceptional circumstances beyond your control (illness, natural disaster, family emergencies meeting HMRC’s defined criteria) can be disregarded, with a cap of 60 days a tax year.
For leavers who spend a lot of time in the UK across the year, the deemed-day rule can also apply: if you have at least three UK ties and spend more than 30 “qualifying days” (days where you arrived in the UK without leaving the same day), additional days may be added for SRT purposes.
Split-Year Treatment
The SRT determines residence for a whole tax year, but if you leave or arrive part-way through, the year can sometimes be split into a UK part and an overseas part for income tax purposes — so income earned after you leave the UK isn’t taxed on a UK-resident basis.
Split-year treatment is available only in defined circumstances, including:
- Starting full-time work overseas (Case 1).
- Accompanying spouse or partner who starts full-time overseas work (Case 2).
- Ceasing to have a UK home (Case 3).
- Starting to have an overseas home only (Case 4 — for arrivers).
- Starting full-time UK work (Case 5).
- Stopping full-time overseas work (Case 6).
- Partner stopping full-time overseas work (Case 7).
- Starting to have a UK home (Case 8).
Each case has detailed conditions and a defined “split-year date”. Many UK leavers who fail to claim split-year treatment correctly end up paying UK tax on overseas income earned in the UK part of the year that should have been treated as foreign post-departure.
Notifying HMRC When You Leave
If you’re leaving the UK and expect to be non-resident:
- Submit form P85 — unless you complete Self Assessment, file form P85 to notify HMRC of your departure date, allow any tax overpaid in the year of departure to be refunded, and set the position on UK-source income going forward.
- Continue Self Assessment if it applies to you — if you have UK rental income, UK self-employment, or any other reason to file, the Self Assessment return continues even when you become non-resident.
- Register as a Non-Resident Landlord if you rent out a UK property after leaving — form NRL1 to receive rent without basic-rate tax deducted at source by the letting agent or tenant.
- Notify other counterparties — your bank, your investment platform, your pension provider, your mortgage lender, your employer’s payroll if you remain employed by a UK entity. Each has its own forms and consequences.
HMRC also requires you to notify them when you return to the UK and become resident again. UK tax residency is a continuing assessment, not a one-time election.
UK-Source Income After You Become Non-Resident
Becoming non-UK tax resident does not stop you owing UK tax on certain UK-source income. The most common categories:
- UK rental income — typically taxable in the UK, with the country of residence often giving credit under the relevant double taxation treaty.
- UK pensions — the position depends on the specific double taxation treaty between the UK and your country of residence. Many treaties give the country of residence primary taxing rights, but not all.
- UK employment income — if performed in the UK, generally still UK-taxable.
- UK savings interest and dividends — specific disregarded-income rules apply for non-residents that can simplify the position.
- Capital gains on UK residential property — since 2015, UK Capital Gains Tax applies to non-residents on disposals of UK residential property; CGT on UK commercial property and indirect interests was extended in 2019.
The interaction with your country of residence’s tax system is governed by the relevant double taxation treaty. Specialist independent guidance is the right route here — most UK-leaving tax mistakes involve mismatched assumptions between the UK and the destination country’s rules.
The Currency Side of Becoming a UK Expat
Once you’re settled into life as a UK expat, the currency angle becomes a recurring background cost rather than a one-off. UK obligations stay denominated in sterling — mortgage payments, ISA contributions if you’ve briefly returned to UK residence, family payments, the occasional UK trip. Foreign-currency salary or pension comes in monthly. The conversion rate you achieve over thousands of monthly transfers across years is the cost that compounds.
Three setups serve UK expats well:
- Regular payment plan — a recurring monthly conversion at near-interbank rates, eliminating the bank margin on routine flow.
- Forward contract for known future liabilities — a forward contract locks in today’s rate for a payment up to 12 months ahead. Useful for school fees, planned UK trips, scheduled UK obligations.
- UK pension drawdown structuring — timing and currency structure of UK pension drawdown to a foreign-currency life can save materially over decades. See our UK pension abroad currency guide.
Cambridge Currencies works exclusively with FCA-authorised payment partners (Currencycloud and ScioPay). Client funds are held in fully safeguarded segregated client accounts. See our companion guide on keeping a UK bank account while living abroad for the banking setup that supports this.
Common Mistakes UK Leavers Make
Assuming intention is enough. Tax residence is determined by the SRT, not by whether you’ve packed up and left. You can intend to leave and still be UK resident if your day count or ties take you over the threshold.
Returning too often in the early years. The leaver thresholds are tighter than the arriver thresholds. UK leavers who treat the UK as their second home in years 1–2 of emigration can easily slide back into UK residence.
Missing split-year treatment. Failing to claim a valid split-year case can mean UK tax on overseas earnings that should have been treated as post-departure foreign income.
Forgetting the country tie for leavers. If you spend more days in the UK than in any other single country (a real risk for movers between two countries), the country tie can push you into UK residence.
Not notifying counterparties. HMRC P85, banks, investment platforms, pension providers, mortgage lenders — each needs notification. Hidden non-residency can cause account closures or worse.
Ignoring CGT on UK property. Non-residents are within the scope of UK Capital Gains Tax on UK property disposals, with reporting and payment deadlines that catch out the unwary.
Frequently Asked Questions
How is UK tax residency determined?
By the Statutory Residence Test (SRT), which applies in three stages: the Automatic Overseas Tests, the Automatic UK Tests, and the Sufficient Ties Test. The first stage that gives a definitive answer is the answer.
How many days can I spend in the UK as a non-resident?
It depends on whether you’re an arriver or a leaver and how many UK ties you have. As a leaver with no UK ties you can spend up to 182 days. With four or more ties, more than 15 days makes you UK resident.
What counts as a UK day for SRT purposes?
The default rule is whether you were in the UK at midnight at the end of that day. Transit days and days falling under exceptional circumstances (with a 60-day cap) can be disregarded.
What is split-year treatment?
A relief that splits the tax year into a UK part and an overseas part for income tax purposes when you leave or arrive part-way through. Available only in defined circumstances (Cases 1–8), each with detailed conditions and a defined split-year date.
Do I need to notify HMRC when I leave the UK?
Yes. Submit form P85, or report your departure via Self Assessment if you complete a tax return. You should also register as a Non-Resident Landlord if you rent out a UK property.
Will I still pay UK tax on my UK pension as a non-resident?
It depends on the double taxation treaty between the UK and your country of residence. Many treaties give the country of residence primary taxing rights, but not all — and government service pensions are often treated separately. Specialist guidance is essential.
Does becoming non-UK resident remove UK Capital Gains Tax exposure on UK property?
No. Since 2015, non-residents are within the scope of UK Capital Gains Tax on disposals of UK residential property; this was extended to UK commercial property and indirect interests in 2019.
Becoming a UK expat and want to set your currency transfers up correctly from day one? Speak to a Cambridge Currencies specialist by phone — we’ll walk you through the best approach for your salary repatriation, UK mortgage payments, scheduled UK obligations and ongoing pension flow. Request a free quote today. All transfers are completed by phone with a dedicated specialist. We work exclusively with FCA-authorised payment partners.
This guide is for informational purposes only and does not constitute financial, legal or tax guidance. The Statutory Residence Test contains detailed conditions beyond the summary above; HMRC’s RDR3 guidance is the authoritative reference. Tax rules and double taxation treaties change — always seek independent professional guidance from a qualified UK tax specialist for your specific circumstances.
