How the SRT works
The Statutory Residence Test determines your UK tax residency based on how many days you spend in the UK and how many 'ties' you maintain there. It has three parts: automatic overseas test, automatic UK test, and the sufficient ties test.
- Automatic overseas: spend fewer than 16 days in the UK = automatically non-resident (if you were UK resident in none of the previous 3 years, the threshold is 46 days).
- Automatic UK: spend 183+ days in the UK = automatically UK resident.
- Sufficient ties test: between 16 and 182 days, your residency depends on how many UK ties you have.
- UK ties: family tie (spouse/minor children in UK), accommodation tie (available UK property), work tie (40+ days UK work), 90-day tie (spent 90+ days in UK in either of previous 2 years), country tie (UK is your main country).
- More ties = fewer days you can spend in the UK. With 4+ ties, you must spend fewer than 46 days.
The ties test in detail
The number of ties you have to the UK determines how many days you can spend there without triggering UK tax residency. This is the test most people need to navigate carefully.
- A 'day' in the UK means being present at midnight. Days of arrival and departure may not count under certain conditions.
- The safest approach: sever as many ties as possible AND keep your UK days well below the threshold.
- Most Cayman relocators have 2-3 ties (family, accommodation, 90-day history). This means staying under 91-121 days.
| UK ties | Days allowed (previously UK resident) | Days allowed (not previously UK resident) |
|---|---|---|
| 4 or more | Fewer than 46 | Fewer than 46 |
| 3 | Fewer than 91 | Fewer than 121 |
| 2 | Fewer than 121 | Fewer than 183 |
| 1 | Fewer than 183 | Always non-resident |
| None | Always non-resident | Always non-resident |
Split-year treatment
In the tax year you leave the UK, you may qualify for split-year treatment. This means you are treated as non-resident from your departure date rather than having to wait until the next full tax year (April 6).
- Available when you leave the UK to live abroad and your circumstances change significantly during the tax year.
- If you qualify: income earned after your departure date is not subject to UK tax. Income before departure is.
- Conditions: you must become non-resident in the following full tax year. If you return to UK residence within the year, split-year treatment may be denied.
- Claim it on your self-assessment tax return for the year of departure.
Temporary non-residence trap
If you leave the UK and return within 5 complete tax years, capital gains realized during your absence may be taxed on your return. This is the temporary non-residence rule and it catches people who planned a short stint abroad.
- Applies if you were UK resident for 4 of the 7 tax years before departure AND return to UK residence within 5 years.
- Capital gains on assets you owned before leaving may be taxed when you return.
- Does not apply if you stay away for 5+ complete tax years.
- Planning tip: if you are considering Cayman for 3-4 years, be aware this rule exists. Seek advice before disposing of assets.
Pensions, ISAs, and National Insurance
Your UK financial products continue to exist from Cayman, but the rules change when you become non-resident.
- State Pension: continues to accrue if you pay voluntary National Insurance. Class 2 contributions cost approximately £3.45/week. Highly recommended to maintain your NI record.
- Private pensions: can be drawn from Cayman. Tax treatment depends on the pension type and any UK-Cayman tax arrangements.
- ISAs: you cannot contribute to ISAs as a non-resident. Existing ISA holdings continue to grow tax-free. Do not close them.
- Premium Bonds: you can keep them as a non-resident. Prizes continue to be tax-free.
- UK property: if you keep UK property, rental income remains subject to UK tax (Non-Resident Landlord Scheme).
- QROPS: transferring pensions to a Qualifying Recognised Overseas Pension Scheme is possible but complex. Take specialist advice.
Practical exit planning
A clean UK tax exit requires planning 6-12 months before departure. The cost of getting it wrong (an extra year of UK tax liability) far exceeds the cost of professional advice.
- Hire a UK tax advisor who specializes in non-residence and international moves. Not a general accountant.
- Sever ties methodically: sell or rent out your UK property, update your domicile of choice, close UK club memberships if relevant.
- Keep a day count diary from your departure date. Track every day spent in the UK meticulously.
- File a departure self-assessment tax return. Claim split-year treatment if applicable.
- Continue voluntary NI contributions to protect your State Pension.
- Coordinate UK and Cayman advisors — your UK advisor and Cayman lawyer should be communicating.