What happens to your UK tax when you leave?
Tax is the area where UK emigrants make the most expensive mistakes. The rules are complex, they interact with the tax system of your destination country, and getting them wrong can cost tens of thousands of pounds.
This guide gives you a plain-English overview. It is not a substitute for professional advice — but it will help you ask the right questions.
The Statutory Residence Test (SRT)
Whether you remain UK tax resident depends on the SRT, introduced in 2013. It has three parts:
Automatic overseas test: You are automatically non-resident if you were resident in the UK for one or more of the 3 preceding years and spend fewer than 16 days in the UK, OR you were not resident for any of the 3 preceding years and spend fewer than 46 days.
Automatic UK test: You are automatically resident if you spend 183+ days in the UK, or your only home is in the UK for 91+ consecutive days.
Sufficient ties test: If neither automatic test applies, your residence depends on a combination of days spent in the UK and the number of ties you maintain (family, accommodation, work, 90-day, country).
The ties test is where it gets complicated. More ties mean fewer days you can spend in the UK before becoming resident again.
Split year treatment
In the year you leave the UK, you may qualify for split year treatment. This means you are only taxed on UK-source income from the date of departure (not the full tax year). Six scenarios qualify — the most common being starting full-time work overseas.
Split year treatment is not automatic. You need to claim it on your Self Assessment return.
Income tax
UK-source income (rental income, UK pension, UK employment): Generally still taxable in the UK even after you leave. Double taxation agreements may provide relief.
Overseas income: Once you are non-UK resident, your overseas income is not taxable in the UK (with some exceptions for the tax year of departure).
Your new country will typically tax you on worldwide income once you become their tax resident. Double taxation agreements prevent being taxed twice, but you need to claim the relief.
Capital Gains Tax
UK property: Non-residents are liable for CGT on UK residential property disposals. If you sell your UK home after becoming non-resident, you may owe CGT on gains from April 2015 onward.
Other UK assets: If you are non-resident for fewer than 5 complete tax years and return to the UK, gains made during your absence may be taxed on return (the temporary non-residence rules).
Timing matters: If you plan to sell UK assets, the timing relative to your departure can significantly affect your tax bill.
National Insurance
You stop paying UK NI when you leave, but this affects your State Pension. You need 35 qualifying years for the full new State Pension.
Voluntary Class 3 contributions (£17.45/week in 2025/26) allow you to maintain your NI record while abroad. Whether this is worth it depends on how many qualifying years you already have.
Pensions
UK State Pension: Paid overseas, but only increases annually if you live in a country with a relevant social security agreement (USA, EU, Australia — yes. Canada, New Zealand — frozen at the rate when you leave).
UK private/workplace pensions: Can be paid overseas, subject to the tax rules of your destination country. QROPS transfers are available but complex and not always beneficial.
ISAs
You cannot contribute to UK ISAs as a non-resident. Existing ISAs remain open and tax-free in the UK, but your destination country may tax the income or gains.
What you need to do before you leave
- File form P85 with HMRC to notify them of your departure
- Complete your Self Assessment for the tax year of departure (and claim split year if applicable)
- Get cross-border tax advice — this is not optional for anyone with property, investments, or pensions
- Understand your destination's tax rules — when you become tax resident there, what they tax, and how the DTA works
- Consider timing of property sales, pension withdrawals, and large transactions
How WestConnect helps
WestConnect partners with vetted cross-border tax advisors who specialise in UK emigrant tax planning. They understand both UK tax law and your destination country's rules, and can structure your departure to minimise your tax liability legally.
This is genuinely one of the highest-value professional services you can invest in. The savings typically dwarf the fees.
Planning your move? Get matched with vetted partners →