Do I pay UK capital gains tax if I sell up after moving?
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UK CGT after leaving: the general framework
Non-UK residents are broadly outside the scope of UK capital gains tax. Once HMRC accepts that you have become non-resident — under the Statutory Residence Test — gains you make on most assets are yours to keep. The UAE levies no personal capital gains tax, so for most people the combination is straightforward: leave cleanly, become non-resident, realise gains, pay nothing.
The complication is in the word “cleanly”. Two rules trip people up repeatedly.
The temporary non-residence rule
If you were UK resident for four or more of the seven tax years before you left, and you come back within five complete UK tax years, HMRC treats gains made on certain assets during your absence as arising in the year you return. It is a deliberate anti-avoidance provision, aimed at people who briefly leave, sell appreciated assets, and come back.
The assets in scope include shares, securities, interests in close companies, and business assets — essentially the things most worth crystallising. UK property is handled separately (see below) and is always in scope regardless.
Five complete tax years is not five calendar years from your move date. It is five full years running 6 April to 5 April. If you left in November 2024, your first complete year of non-residence begins 6 April 2025. Your five-year window closes 5 April 2030.
The practical implication: if you are contemplating a return to the UK — permanently or for a significant period — the timing of any major disposal matters enormously.
UK property: a different regime
UK residential and commercial property has its own non-resident CGT rules, introduced in 2015 and extended in 2019. Gains on UK-situated property are taxable in the UK regardless of where the seller lives. There is no exemption for non-residents, and no relief simply because you have moved abroad.
You must report a UK property disposal within 60 days of completion and make a payment on account at that point, even if you are filing a self-assessment return later. Missing the 60-day window brings automatic penalties.
The rate of tax depends on the type of property and your income in the year of disposal. Basic-rate taxpayers pay less than higher-rate; the precise rate applied to residential property differs from that applied to commercial. A UK tax adviser can work out your liability before you exchange contracts, which is the right time — not after.
Timing a disposal around your departure
A common question is whether to sell before or after leaving. The honest answer is: it depends on the asset, the gain, your departure date, and whether you expect to return.
| Scenario | UK CGT position |
|---|---|
| Non-UK asset sold after clean non-residency established, no return within 5 years | Generally outside UK CGT |
| Non-UK asset sold during non-residence, return within 5 complete years | Gain taxed in year of return |
| UK residential property sold at any point as non-resident | Always taxable in UK; 60-day reporting |
| UK commercial property sold as non-resident | Taxable in UK |
| Asset sold before UK non-residency established | Standard UK CGT applies |
The cleanest exits happen when departure is treated as a tax event in itself — not an afterthought once the assets are already sold.
What “leaving cleanly” actually means
The SRT is the mechanism. Your residence status for a given tax year is determined by a combination of day-counts, automatic tests, and sufficient ties. Getting the date wrong by a few weeks can shift a disposal from one tax year to another, with significant consequences.
It also matters how HMRC views the departure at all. A person who keeps strong UK ties — a family home, regular weeks in the UK, a UK-managed business — may not be as non-resident as they think, regardless of where they sleep most nights.
Already left the UK and not sure you did it cleanly? The Clean Break Review gives you a clear read on your UK tax position, reviewed by a UK-registered tax adviser.