If you own an agency in the UK and you're thinking about moving to Dubai, the question of exit tax on your shares is probably near the top of your list. The short answer is this: if you hold unlisted agency shares (the kind most founders have in their own limited company), there is no automatic exit charge when you leave the UK. But HMRC has anti-avoidance rules that can create a deemed disposal of those shares. Get the timing or structure wrong, and you could face a tax bill you weren't expecting.
This article covers what UK exit tax on shares means for agency founders moving to Dubai, where the traps are, and what to do before you change your tax residence.
What Is Exit Tax on Shares Moving to Dubai?
Exit tax is the charge that can apply when someone ceases to be UK tax resident while holding certain assets. For most assets (property, listed shares, cryptocurrency), the UK charges capital gains tax as if you sold them on the day you left. But for unlisted shares in a trading company, which is what your agency shares almost certainly are, the rules are different.
Under section 2 TCGA 1992, you are only chargeable to capital gains tax on disposals of assets while you are UK resident. Once you are non-resident, disposals of UK unlisted shares generally fall outside UK CGT. There is no deemed disposal at the point of departure.
This means that, in principle, you can move to Dubai, keep your agency shares, sell them years later while non-resident, and pay no UK capital gains tax. That is the headline. But there are conditions and exceptions that matter.
When Does Exit Tax Apply to Unlisted Agency Shares?
The main exception is the temporary non-residence rule (s.10A TCGA 1992). If you are non-resident for fewer than five complete tax years, and you dispose of your shares during that period, HMRC can treat the gain as arising in the year you left. In effect, you are taxed as if you were still UK resident at the time of disposal.
This is the biggest trap for agency founders who move to Dubai thinking they can sell up quickly and escape tax. If you sell within five years of leaving, the gain is brought back into the UK tax net. You need to stay non-resident for at least five complete tax years before you sell to make the gain tax-free in the UK.
There is also a specific anti-avoidance rule for deemed disposals. If you hold shares in a close company (which most agencies are), and you trigger a capital gains event within the company itself, for example, the company sells a valuable asset, or there is a share buyback, HMRC can look through the structure and treat you as having made a disposal. This is less common for straightforward agency structures, but it is worth knowing about.
What Is Deemed Disposal and Why Does It Matter?
Deemed disposal is the term HMRC uses when they treat you as having sold an asset even though you did not actually sell it. For agency founders moving to Dubai, the most relevant deemed disposal rule is in section 24 TCGA 1992: if your shares become of negligible value, you can claim a deemed disposal and loss. That is a positive rule for you.
But there are negative deemed disposal rules too. If you transfer assets out of the UK while non-resident, or if you restructure your shareholding in a way that HMRC considers a disposal, you can trigger a charge. For example, if you move your agency shares into an offshore trust before leaving, HMRC can treat that as a disposal at market value.
For most agency founders with a straightforward shareholding in their own trading company, deemed disposal is not an issue. The risk is low if you do nothing other than move and hold the shares. But if you start restructuring, moving shares between entities, creating holding companies, or gifting shares to family members, the deemed disposal rules can apply.
How Long Do You Need to Be Non-Resident to Avoid UK Tax?
Five complete tax years. That is the magic number. A UK tax year runs from 6 April to 5 April. If you leave the UK on 1 June 2025, your first complete non-resident tax year is 2026/27 (starting 6 April 2026). You would need to remain non-resident until at least 6 April 2031 to satisfy the five-year rule.
If you sell your shares during that five-year window, the gain is taxed in the UK as if you were still resident. The gain is calculated based on the original acquisition cost, not the value at the date you left. So if your shares were worth £500,000 when you left and £2 million when you sold three years later, the full £1.5 million gain is taxable in the UK.
This is why timing matters. If you are planning an exit, you need to either sell before you leave (paying UK CGT at the prevailing rate) or commit to staying non-resident for at least five full tax years after the sale.
What About Business Asset Disposal Relief (BADR)?
If you sell your agency shares while UK resident, you can claim BADR (formerly Entrepreneurs' Relief) on the first £1 million of gains, at 14% for disposals from 6 April 2025 to 5 April 2026, rising to 18% from 6 April 2026. But if you sell while non-resident, BADR is not available. The relief requires you to be UK resident at the time of disposal.
This creates a trade-off. Sell before you leave and pay 14% (or 18% from 6 April 2026) on up to £1 million of gains, with the balance at 24%. Or move to Dubai, wait five years, and pay 0% UK tax on the entire gain. For a founder with a £2 million gain, the difference is significant.
But remember: if you sell while non-resident within the five-year window, you lose BADR and pay full UK rates anyway. There is no halfway house. You are either UK resident and eligible for BADR, or you are non-resident and outside the UK CGT net entirely (after five years).
What About UAE Tax on Your Agency Shares?
The UAE has no capital gains tax for individuals. If you are a UAE tax resident (which requires meeting the physical presence or economic activity tests), you pay 0% on any gain from selling your agency shares. There is no exit tax in Dubai on share disposals.
But you need to be genuinely tax resident in the UAE. That means spending at least 183 days in the UAE per tax year, or meeting the new economic substance test introduced in 2023. A holiday home and a few weeks per year will not cut it. HMRC will challenge your non-residence if your ties to the UK are stronger than your ties to the UAE.