UK Exit Tax: Does the UK Tax You When You Leave?

The UK has no formal exit tax — at least not yet. There's no deemed disposition on departure, no mark-to-market calculation on unrealized gains, no wealth threshold that triggers a liability when you leave. But "no exit tax" doesn't mean leaving the UK is tax-free or straightforward, and the political environment around a UK exit tax has been shifting.

The Treasury has explicitly debated introducing a "settling up charge" on departure. The abolition of the non-dom regime in 2025 removed the most significant tax advantage for wealthy UK residents. And the temporary repatriation facility has created a narrow window for non-doms to settle outstanding foreign income cheaply before the window closes. Understanding what is taxed when you leave is just as important as knowing what isn't.

When UK Tax Residency Ends

UK tax residency ends under the Statutory Residence Test (SRT), which was introduced in 2013. The SRT uses a combination of day counts, automatic tests, and "sufficient ties" to determine residency. Leaving the UK does not automatically end residency — the SRT has to be worked through carefully.

Automatic non-residence applies if you spend fewer than 16 days in the UK in a tax year (or fewer than 46 days if you were not UK resident in any of the three previous tax years). These are clean-cut cases.

For people with strong UK ties (family, property, work), the sufficient ties test can maintain UK residency even with moderate day counts. Having a UK spouse, UK property available for use, substantive UK work, or having been resident in at least 1 of the 3 prior years all add ties that reduce the day threshold for residency.

The UK tax year runs April 6 to April 5. Splitting a tax year (leaving mid-year) is possible but requires establishing a clear non-residency date under the SRT.

Capital Gains Tax on Departure

Technically, there's no CGT exit charge for individuals. When you become non-resident, you generally stop being subject to UK CGT on non-UK assets. But there's an important exception: temporary non-residence rules.

If you leave the UK and return within five years, any assets you disposed of while non-resident are treated as if you disposed of them in the year you returned. The gains are pulled back into UK tax. This prevents people from briefly becoming non-resident, selling a large holding, and returning to the UK.

The five-year rule means the "leave and sell" strategy only works if you're genuinely leaving for at least five complete UK tax years. People who return to the UK within that window find the tax bill waiting for them.

UK residential property is taxed differently. Since 2015, non-residents have been subject to UK CGT on UK residential property disposals, and since 2019, this was extended to all UK property and land. Leaving the UK doesn't exempt you from CGT on UK real estate.

The Non-Dom Abolition and What It Means

The non-domicile regime was abolished effective April 6, 2025. This was a significant structural change to UK tax, not a minor adjustment.

Under the old regime, non-domiciled UK residents could elect to pay UK tax only on income and gains remitted to the UK (the remittance basis), potentially sheltering foreign income and gains earned abroad for years or indefinitely. Long-term non-doms (resident 7+ years) paid annual charges to use the remittance basis, but the ability to leave foreign gains untaxed was a major planning tool.

The replacement regime is a four-year foreign income and gains (FIG) exemption for new arrivals: people who weren't UK resident in the prior 10 tax years can receive foreign income and gains tax-free for their first four years of UK residency. After four years, worldwide income and gains are fully taxable. There's no remittance basis anymore — it's a clean exemption for new arrivals only.

Temporary Repatriation Facility (TRF): Former non-doms who have unremitted foreign income and gains from the remittance basis years can remit them to the UK at a reduced rate (12% in 2025-26 and 2026-27, then 15% in 2027-28) instead of the full income tax rate. This window closes after April 2028.

The Proposed "Settling Up Charge"

Treasury officials have discussed a departure charge that would tax wealthy individuals on unrealized gains when they permanently leave the UK. The concept — sometimes called a "settling up charge" — is modeled roughly on France's and Germany's exit tax regimes.

As of early 2026, no legislation has been enacted. But the political trajectory — abolition of non-dom, tightening of residence tests, increased HMRC scrutiny of offshore structures — suggests the UK is moving toward greater taxation at the point of departure, not away from it.

Anyone with significant unrealized UK or non-UK gains who is planning to leave the UK should factor in the possibility of a future exit charge, and consider timing accordingly.

Inheritance Tax Implications of Leaving

One change from the non-dom abolition that affects people leaving the UK: inheritance tax (IHT) domicile rules have changed. Under the old regime, non-domiciles were only subject to UK IHT on UK-situs assets, allowing long-term UK residents to shelter foreign assets from 40% IHT by maintaining a foreign domicile.

The new rules use a residence-based test: people who have been UK resident for 10 of the last 20 tax years are within the scope of UK IHT on worldwide assets. After leaving the UK, they remain in scope for a "tail period" of up to 10 years, depending on how long they were resident.

This is the closest thing the UK currently has to a departure tax: not a CGT exit charge, but an IHT long-tail that follows long-term residents after they leave.

For anyone managing intergenerational wealth and planning a UK departure, the IHT tail requires specific attention. The five-year CGT temporary non-residence rule and the IHT long-tail can overlap in uncomfortable ways if the timing isn't planned.

For a full comparison of how the UK approach stacks up against France's formal exit tax, Germany's regime (expanded in 2025), and the potential direction of UK policy, The Exit Tax Playbook maps out each country's rules in practical terms.