If you have heard people mention “UK exit tax” and you are moving to the UAE, this guide explains what it means, when it applies, and what you can do before you leave.
This stays practical. It focuses on the rules, the numbers, and the decisions that matter. For what happens when people move without exit tax planning, the pattern is usually the same: the bill turns up after the move, when the options are already limited.
What is UK exit tax?
UK exit tax is Capital Gains Tax (CGT) triggered when you stop being UK tax resident. HMRC treats certain assets as if you sold them on the day you leave. You pay CGT on the gain, even if you did not sell anything. This is called deemed disposal. The gain is the difference between the market value at departure and what you paid for the asset.
This is the key idea behind deemed disposal. HMRC treats the assets as sold at market value on the day you leave.
The logic is simple. If you spent years building a valuable company while living in the UK, that value was created under UK tax rules. Without a deemed disposal rule, you could leave, sell the company from abroad, and pay nothing to HMRC. The exit tax rule stops that.
To work out when you officially stop being UK tax resident, you need to apply the UK Statutory Residence Test to your own case. HMRC’s RDR3 guidance document is the main reference. The exit tax calculation uses the departure date from that test.
Which assets trigger UK exit tax?
The assets that trigger UK CGT on deemed disposal are shares and securities. That includes shares in private UK companies, shares in overseas companies, unit trusts, OEICs, and investment portfolios held outside ISAs. The main rule is simple. The asset must not be exempt, and you must have been UK resident when you acquired it.
Here is the breakdown by asset type.
Private company shares. Shares in your UK limited company are usually caught. That includes sole shareholders, multiple shareholders, and holding company structures. Most UK contractors and business owners fall into this group.
Investment portfolios. Shares held in a general investment account (GIA) are subject to deemed disposal. This covers individual shares, funds, investment trusts, and ETFs held outside a tax wrapper. If you have unrealised gains in a GIA, leaving the UK can create a CGT event.
Overseas company shares. Shares in non-UK companies are also caught. If you hold shares in a foreign business or have stock options from a US or European employer, these can fall within scope.
Crypto assets. HMRC treats crypto as a capital asset. Unrealised gains on crypto holdings when you leave can fall within deemed disposal.
What is not caught:
- ISA holdings. ISAs are specifically exempt from deemed disposal.
- UK pension funds. Pensions sit outside CGT entirely.
- UK property. This is not subject to deemed disposal and is covered separately below.
- Gilts and qualifying corporate bonds.
The thresholds that matter are the standard CGT annual exempt amount (£3,000 for 2024/25) and the CGT rates in force when you leave. Gains above the exempt amount are taxed at 18% or 24% for residential property, and 10% or 20% for other assets. Business Asset Disposal Relief (BADR) can reduce the rate to 10% on qualifying gains up to the £1 million lifetime limit. Exit tax is a one-off cost, and it can change the numbers on a move. See how exit tax changes your UAE financial break-even calculation if you want to put the tax bill next to salary, living costs, and savings.
The company shares scenario
For most UK business owners moving to the UAE, exit tax on company shares is the biggest exposure. The calculation uses market value at departure, not what you paid. For companies built from scratch, the purchase cost is often close to zero, so most of the current value becomes a taxable gain.
Here is a worked example.
A UK consultant set up a limited company in 2018. She is the only shareholder. She subscribed for shares at nominal value, so her cost was £1 in total. The company has grown. By the time she moves to the UAE in 2025, the company is worth £600,000.
The deemed disposal calculation:
- Market value at departure: £600,000
- Acquisition cost: £1
- Gain: £599,999
- Less annual exempt amount: £3,000
- Taxable gain: £596,999
- CGT at 20%: £119,400 tax due
That is a large bill. The final number can change quite a bit.
Business Asset Disposal Relief (BADR). If the company qualifies for BADR, the CGT rate drops to 10% on gains up to the £1 million lifetime limit. In the example above, BADR would cut the bill to about £59,700, which is almost £60,000 less.
To qualify for BADR at departure, you normally need to have owned the shares for at least two years and worked as an officer or employee of the company during that period. There are other conditions too. You need to confirm BADR eligibility before you leave. It does not happen automatically.
Company valuation. A service company built around one person is not always worth a simple turnover multiple. Goodwill may be personal rather than business goodwill. HMRC’s view of your sector and structure matters. The valuation used in the calculation is the starting point for the whole liability.
Retained profits. If the company has large retained profits, they affect the valuation. They can also be taken out before departure through dividends or salary, which changes the picture. Timing matters here.
For the question of keeping your UK limited company after moving versus closing it down, that is a separate decision. This article covers the tax position at the point you leave. It does not cover the ongoing choice of structure in the UAE.
The investment portfolio scenario
Unrealised gains in a general investment account (GIA) are caught by deemed disposal when you leave the UK. HMRC treats you as having sold the full portfolio on the day you become non-resident. CGT is due on the gain, even though you kept the investments and received no cash.
Here is the scenario.
A UK professional holds a GIA portfolio worth £280,000. He invested £150,000 over several years. The portfolio has grown by £130,000 in unrealised gains.
Deemed disposal calculation at departure:
- Deemed sale proceeds: £280,000
- Acquisition cost: £150,000
- Gain: £130,000
- Less annual exempt amount: £3,000
- Taxable gain: £127,000
- CGT at 20%: £25,400
He has not sold anything. He has not received any cash. But he still owes £25,400.
A few planning points for investment portfolios:
ISA holdings are exempt. If the same portfolio were held in an ISA, there would be no deemed disposal. ISAs are specifically excluded. Knowing what sits in your ISA and what sits in your GIA is the first step.
Loss offsets. CGT losses from other assets can reduce the taxable gain. Look at all assets together, not one at a time.
Selling before departure. If you sell the portfolio before you leave and reinvest later, you crystallise the gain while you are still UK resident. That lets you use the annual exempt amount, offset losses, and sometimes split the disposal across two tax years. For large portfolios with big gains, that can be better than one deemed disposal event. It depends on the numbers.
What does not trigger exit tax
UK property is not subject to deemed disposal when you leave. HMRC handles UK property gains through a separate non-resident CGT regime. As a UAE resident, you still pay UK CGT when you actually sell a UK property, but leaving the UK does not trigger a deemed disposal of property assets.
Key assets not subject to exit tax on departure:
UK residential and commercial property. Property is outside the deemed disposal rules. That does not mean it is tax-free. It is not. Non-residents pay UK CGT on gains made after April 2015, and they must report disposals within 60 days of completion. But there is no tax event when you leave. Read more about UK property tax as a UAE resident for how this works in practice.
UK pension funds. Defined contribution and defined benefit pensions are not subject to deemed disposal. Pension income has its own tax treatment for non-residents, but the pension fund itself does not trigger CGT when you leave.
ISA holdings. ISAs are exempt. The same shares held in an ISA and in a GIA can produce completely different outcomes. This is one of the clearest cases where account structure changes the tax result.
Cash. Cash is not a capital asset for CGT purposes. Sterling or foreign currency cash balances do not trigger deemed disposal.
The 5-year rule: temporary non-residence
If you leave the UK but return within five complete tax years, HMRC can tax gains you realised during your absence. This is the temporary non-residence rule. Gains on assets you dispose of after departure but before your return are brought back into UK tax when you come back. They count in the year of return.
This matters for UAE movers who are not sure how long they will stay.
Here is how it works. You leave the UK on 1 September 2025 and become non-UK resident. In 2027, you sell your company shares while you are in the UAE. No UK CGT applies at the time because you are non-resident.
In 2029, you return to the UK permanently. Because your absence was less than five complete tax years, the gains from the 2027 share sale are brought back into the UK tax net. They are taxed in 2029/30.
The five-year clock counts complete tax years of non-residence, not calendar years. If you left part way through 2025/26, that partial year may not count as a full year. The exact departure date and where it falls in the tax year matters.
The 5-year rule does not apply to deemed disposal gains crystallised at departure. Those are taxed when you leave, no matter what. The rule applies to disposals you make while you are non-resident. The risk is simple. You leave, you keep exit tax exposure low at the start, you sell assets during your UAE years thinking the UK tax issue is gone, then you return and the gain comes back into the UK system.
For anyone who may return to the UK later, this rule needs to be part of the plan before departure. Read the article on returning to the UK from UAE for more on how the return affects your overall position.
Planning options before you leave
The most useful exit tax planning happens before departure. Some options only exist while you are still UK resident. Once you leave, those doors close. Your departure date, BADR eligibility, and portfolio structure all need attention before you go.
Key planning areas:
- Your departure date matters. Leaving in April and leaving in September can produce different results because income, reliefs, and exempt amounts can change.
- BADR eligibility needs to be checked before departure. You cannot choose it later if you did not meet the conditions when you left.
- Your portfolio needs a review. For GIA holdings, compare the deemed disposal outcome with selling before departure and reinvesting after.
- Retained profits need timing decisions. If your company has profits left in it, think about dividends and salary before departure, because that income is UK-taxable income.
- Your Self Assessment filing needs to be ready. Exit tax gains from deemed disposal go on the UK Self Assessment return for the year you leave, and the deadline is 31 January after the tax year ends.
For a full account of what goes wrong when people skip this planning, see UK tax exit mistakes that cost people most.
On the treaty side, the UK-UAE double taxation treaty is useful context. The treaty limits double taxation on some income types. It does not remove UK exit tax. Exit tax is mainly a UK-side charge on gains built up while you were UK resident. The UAE does not tax capital gains, so the treaty does not cancel the UK charge. It is still worth understanding the treaty as part of the bigger picture.
If you want to review your own UK exit position before you move, the UK exit tax planning service covers the full picture alongside your UAE company and visa setup. We work with qualified UK-UAE tax specialists so both sides are handled together.
Disclaimer: This article gives general information about UK exit tax rules for educational purposes only. It is not tax advice. Rules change, and personal circumstances vary a lot. Always get advice from a qualified UK tax professional who handles international moves before you act. MoveToUAE.co.uk provides UAE company formation and visa services and works with qualified UK-UAE tax specialists for exit planning. We do not give UK tax advice directly.
Frequently asked questions
Do I owe UK exit tax if my assets have not increased in value?
No. Exit tax only applies where there is a gain. If your assets are worth less than you paid, there is no CGT charge. You may be able to report and carry forward a loss.
Can I pay UK exit tax in instalments?
HMRC allows instalment arrangements for illiquid assets such as private company shares. Interest applies. Check the current rules with a qualified adviser when you file your Self Assessment return.
Does exit tax apply to a small or low-value company?
Yes. The rules depend on the asset type, not the company size. If the total gain is within the annual exempt amount (£3,000 for 2024/25), no CGT is due. Many owners underestimate company value, especially where retained profits or goodwill exist.
What if I have never filed a Self Assessment return before?
You need to register and file for the year you leave. Exit tax gains go on Self Assessment. HMRC can investigate unreported gains and charge penalties. Register as soon as you know your departure date.
Does UAE’s zero tax rate eliminate UK exit tax?
No. UAE’s zero tax rate applies to future income and gains as a UAE resident. UK exit tax is a UK charge on gains built up while you were resident in the UK. They are separate rules.