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Capital gains tax (CGT) is one of the largest tax bills facing British expats, especially those with investment portfolios or UK property. The good news: the UK offers multiple legal strategies to reduce your CGT liability. Understanding these seven strategies could save you tens of thousands of pounds.
Once you become a non-resident, your CGT exposure changes. You can no longer defer gains indefinitely, and you lose access to certain reliefs. For UK property, you become subject to non-resident CGT at 18%/24% on any appreciation that occurs while you are non-resident.
The optimal time to plan CGT is before you leave the UK. After departure, your options narrow. Plan too late, and you'll pay tax on gains that could have been managed with better timing.
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For the 2026 tax year, the UK CGT rates are:
Every individual gets an annual exempt amount of £3,000 (frozen until at least 2030). This means you can realise up to £3,000 of gains tax-free each year.
For non-residents, the exemption still applies on certain UK property disposals, but the rates are the same: 18%/24%.
This is the easiest strategy and the one most expats underuse. You have a £3,000 exemption every tax year-use it.
Plan to realise £3,000 of gains annually in portfolio holdings, managed funds, or other investments where you want to reduce the size of a position anyway. This costs you no tax and compounds over time.
If you have a spouse, they also have a £3,000 exemption, giving you £6,000 of combined tax-free gains annually. Coordinate with your spouse to ensure both exemptions are used each year.
Expat benefit: Once you become non-resident, you lose access to some reliefs but retain the annual exemption on most assets. Use it consistently throughout your non-residency.
Decide whether to realise investment gains before you leave the UK or after. This decision is fundamental.
If you crystallise before departure, you pay CGT at your resident rate (18% or 24%) but avoid the temporary non-residence (TNR) trap.
The TNR rule is complex, but the principle is simple: if you leave the UK, stay away for five years or less, and then return, gains realised on non-UK assets while you were temporarily non-resident are taxed in the year you return. This 'pulls back' gains made overseas into your UK tax net.
To avoid the TNR trap, crystallise gains before departure if you think you'll return to the UK within five years.
If you stay abroad for 5+ years, the TNR trap doesn't apply, and you can realise gains as a non-resident and avoid re-taxation on return.
The decision matrix: Return within 5 years? Crystallise before leaving. Staying abroad indefinitely or 5+ years? You have flexibility to realise gains offshore.
Spousal transfers are completely free of CGT. If you are married or in a civil partnership, you can transfer assets to your spouse free of any tax.
This is valuable if:
Note: This is a planning tool only if your marriage is stable and you trust your spouse with asset ownership. Use with care.
If you own a UK home, PPR relief is the single largest CGT exemption available.
PPR relief exempts any gain on your main residence for periods when you lived in it as your principal private residence. If you bought a UK home for £200,000, lived in it for 10 years, and sold it for £350,000, you may owe no CGT at all (the entire £150,000 gain is exempt).
However, once you become a non-resident, you lose PPR relief on any future appreciation. If you leave the UK in 2026 and your property appreciates by £100,000 by 2030 when you sell it, you pay CGT on that £100,000.
The strategy: If you own a UK home, decide: do you sell before departure (and keep the PPR relief on all gains), or do you retain it and sell later (losing PPR on non-resident periods but potentially getting growth at a lower cost-base)?
The math depends on expected appreciation, your tax rate, and whether you think you'll return to the UK.
Bed-and-breakfast (BAB) involves selling an asset to realise a loss, then repurchasing it almost immediately. The loss is usable against gains, but you've reset your cost base.
While strict anti-avoidance rules prevent abusive BAB strategies, legitimate bed-and-breakfast within 30 days is permitted if done genuinely.
Plan bed-and-breakfast transactions before departure if you have assets with embedded losses. Realise the loss, offset gains, and reset the cost base. This is especially valuable if you have both losses and gains in your portfolio.
However, a word of caution: HMRC scrutinises BAB transactions carefully, and the rules have been tightened. Ensure your adviser designs the transaction correctly.
If you have held EIS shares for three years or longer, you have deferral relief available. This relief allows you to defer CGT on gains by reinvesting in new EIS shares.
Before departure: If you plan to realise a large gain and reinvest in EIS, do this before you leave the UK. Once you're a non-resident, the EIS rules become more complex, and not all EIS reliefs are available to non-UK residents.
Deferring a gain into new EIS shares effectively postpones your tax liability, which can be a powerful planning tool in the year of departure.
When you leave the UK and become non-resident, certain assets are treated as if you acquired them again at their market value on the date you became non-resident. This is called 'rebasing' or 'deemed acquisition'.
For non-UK assets: Gains accrued before departure are not taxable to you as a UK non-resident (subject to double taxation treaties). Your cost base resets to the market value when you become non-resident.
Example: You own overseas shares bought for £10,000 that are now worth £50,000. You leave the UK in April 2026. As a non-resident, your deemed cost base becomes £50,000. Future gains (after April 2026) are subject to your home country's tax, not the UK's.
This is a valuable relief and happens automatically-no planning required. However, ensure your tax adviser in your new country understands the UK cost base, as it affects your overseas tax position.
Once you're a non-resident, you must report UK property sales within 60 calendar days of completion and pay any CGT due. Failure to report triggers penalties and interest.
Keep detailed records of your departure date (for the SRT test), acquisition costs, and disposal proceeds. HMRC will challenge CGT computations if records are poor.
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The optimal time to plan CGT is 6-12 months before departure. This gives you time to:
By the time you leave, your CGT exposure should be significantly reduced or managed into the most tax-efficient structure.
3-6 months before departure: Meet your adviser and model CGT scenarios. Decide which assets to crystallise and which to retain.
1-3 months before departure: Execute the plan. Realise gains, use exemptions, and transfer assets to spouses if needed.
On departure: Document your non-residency date and ensure your cost bases are clear.
After departure: Keep meticulous records of all UK property disposals and report them within 60 days.
The Bottom Line: CGT for expats is not inevitable. Strategic timing, use of exemptions, and careful asset planning can reduce your bill by tens of thousands. The key is to plan before you leave, not after. Once you've left the UK, your options shrink and your tax costs rise.
Shil Shah is Skybound Wealth’s Group Head of Tax Planning and a Private Wealth Adviser, based in London. He works with clients who live global lives, executives, entrepreneurs, families and professionals who want clear, confident guidance on their wealth, their tax position and the decisions that shape their future.
This guide is educational and current as of April 2026. CGT law is complex, and the optimal strategy depends on your specific assets, departure timing, destination country, and expected return date. Before executing any CGT strategy, consult a qualified tax adviser who understands your full position.
If you were UK-resident for 4+ of the prior 7 years and you leave for 5 years or less, gains on non-UK assets realised while you're abroad are taxed in the year you return to the UK. This 'pulls back' offshore gains into UK taxation unexpectedly.
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CGT planning is one of the highest-value services an expat can use before leaving the UK. A poor plan can cost more in tax than the adviser fee saves. Timing, asset selection, spousal transfers, and relief mechanisms all matter.
