Guide · Tax
UK Tax Exile: What It Costs, What You Save, and How to Do It Legally
Leaving the UK for tax purposes can save a higher-rate taxpayer tens of thousands of pounds per year — but it requires genuinely leaving, and HMRC has elaborate rules to ensure you really have gone.
The Statutory Residence Test (SRT)
UK tax residence is not simply about where you choose to live — it is determined by a statutory test. The three tiers of the SRT are:
- Automatic non-residence — Spend fewer than 16 days in the UK (if you were resident in 1+ of the preceding 3 tax years). Or fewer than 46 days if you have no UK home during the year.
- Automatic residence — Spend 183+ days in the UK, or have your only home in the UK for 91+ consecutive days.
- Sufficient ties test — Between 16 and 182 days, residence depends on how many UK "ties" you have. Five types of tie exist: family, accommodation, work, 90-day (previous presence), and country (spent more days in UK than any other). The fewer ties you have, the more days you can spend in the UK before becoming resident.
Days threshold by ties (for a previously resident person)
| UK Ties | Max UK days before resident |
|---|---|
| 0 ties | 45 |
| 1 tie | 90 |
| 2 ties | 120 |
| 3 ties | 182 |
| 4+ ties | 15 (automatic resident above 15) |
What you save: a worked example
Consider a higher-rate UK taxpayer on a £120,000 gross salary. Their UK tax bill in 2026/27 is approximately:
Moving to the UAE (0% income tax, no social security for foreign nationals):
NI savings depend on the nature of work arrangement. Self-employed individuals typically cease UK NI liability on becoming non-resident if they have no ongoing UK employment.
What you still owe HMRC
- UK-source income — UK rental income, UK dividends, UK pensions, and UK employment income remain taxable in the UK (subject to treaty relief).
- UK residential property CGT — Gains on UK property must be reported within 60 days of completion and are taxed at 18% or 24%.
- Temporary non-residence — If you return within 5 full tax years, gains crystallised abroad on assets owned before you left may be taxed on your return.
- IHT tail (long-term residents) — If you were UK resident for 10+ of the last 20 tax years, your worldwide estate remains within IHT for a continuing tail period after leaving.
Popular destinations compared
| Destination | Income Tax | CGT | Social Sec. | COL vs UK |
|---|---|---|---|---|
| 🇦🇪 UAE | 0% | 0% | 0% | +5% |
| 🇲🇨 Monaco | 0% | 0% | 13% | +150% |
| 🇵🇹 Portugal (IFICI) | 20%* | 28% | 11% | −25% |
| 🇨🇭 Switzerland (Forfait) | ~12% | 0% | 5.3% | +65% |
| 🇸🇬 Singapore | 17% | 0% | 0%** | +15% |
| 🇬🇮 Gibraltar (Cat 2) | ~10%*** | 0% | 10% | −10% |
* IFICI: 20% flat rate for 10 years on qualifying foreign-sourced income. ** CPF applies only to citizens and PRs, not foreign workers. *** Capped at approx. £30k/yr for Category 2 residents. Rates are illustrative — verify with a qualified advisor.
The hidden costs of leaving the UK
The tax saving is the headline number, but it is not the whole picture. Several recurring costs are easy to overlook when you're comparing a six-figure tax saving against the lifestyle change of leaving:
- NHS access — Once you're not ordinarily resident, free NHS care beyond immediate emergency treatment disappears. Private international health insurance can run from roughly £2,000/year for a healthy individual to £10,000–£20,000+/year for an older applicant, a family, or anyone with pre-existing conditions.
- School fees — Dubai, Singapore, Switzerland and most popular exile destinations don't offer free schooling to foreign nationals. International school fees of £10,000–£30,000 per child per year are common, often with one-off enrolment or capital fees on top.
- Insurance generally — Life cover, income protection, and critical illness policies taken out while UK-resident may lapse, be repriced, or be refused outright once you become a non-resident. Check before you go, not after.
- Visiting the UK is rationed — The SRT ties test means every additional day you spend in the UK chips away at your non-resident status. A parent's milestone birthday, a hospital visit, or a family wedding all count against your day allowance — and with full UK ties, that allowance can be as low as 45 days a year.
- The cost of "going home" — Flights, hotels (if you've sold your UK home), and the opportunity cost of those rationed days add up. A family of four flying back from Dubai twice a year can easily cost £4,000–£6,000, before accommodation.
- State Pension gaps — Leaving the UK can create gaps in your National Insurance record. Voluntary Class 2 or Class 3 contributions — a few hundred pounds a year — are usually far cheaper than the State Pension income you'd otherwise lose.
Frequently asked questions
How many days can I spend in the UK without becoming tax resident?
For someone who was previously UK tax resident, automatic non-residence applies if you spend fewer than 16 days in the UK in a tax year. If you have a UK home that you visit during the year, the threshold drops. Between 16 and 182 days, UK residence depends on whether you have UK 'ties' — family, accommodation, work, or the 90-day tie (having spent 90+ days in the UK in one of the two prior tax years). Spending 183 days or more in the UK in any tax year automatically makes you resident, regardless of ties.
Do I still pay CGT as a UK non-resident?
Yes — on UK residential property. Non-residents are exempt from CGT on most other UK assets (shares, funds, personal property). But UK residential property remains in scope: gains must be reported to HMRC within 60 days of completion, and taxed at 18% (basic rate) or 24% (higher rate). There are also rules on indirect interests in UK property-rich companies. If you return to the UK within 5 tax years after leaving (temporary non-residence), gains on other assets crystallised while abroad may also become taxable.
What happens to UK Inheritance Tax after I leave?
From April 2025, HMRC introduced the 'long-term resident' (LTR) rule. If you were UK resident in 10 or more of the preceding 20 tax years, your worldwide assets remain subject to UK IHT even after you leave — for a tail period of up to 10 years (the exact tail length depends on how long you were resident). UK-sited assets remain within the IHT net regardless of domicile. Only those who were resident for fewer than 10 of the previous 20 years avoid the LTR status immediately on leaving.
Can I keep my UK pension and ISAs as a non-resident?
You can keep your existing UK pensions and ISAs. However, you can no longer make new ISA contributions as a non-resident. UK pension withdrawals taken abroad may be subject to UK withholding tax (typically 20–25%) unless a double tax treaty provides relief. Some treaties (e.g. UK-UAE) exempt UK pension income from UK tax entirely once you are a UAE resident. You should review the specific treaty between the UK and your destination country.