Selling Your UK Business Before Moving to Dubai: CGT and Timing (2026)

For many UK founders, selling their business is the single largest financial event of their lives. A move to Dubai is often part of the same plan. But the interaction between UK capital gains tax, the timing of your departure, and HMRC's temporary non-residence rules is genuinely complicated, and the cost of getting it wrong can be very large.

This guide sets out the key principles: when a UK business sale triggers UK CGT, how leaving the UK before the sale can change that position, why the temporary non-residence rule means departure alone is not always enough, and how the UAE's 0% CGT interacts with all of this. The numbers involved in most business sales mean you should take advice tailored to your circumstances; this guide is a starting framework, not a substitute for that.

How does UK CGT apply to a business sale?

UK capital gains tax applies when you dispose of an asset and make a gain. For a founder selling their company, the typical disposal is a sale of shares. The taxable gain is the sale proceeds (including any initial consideration, and often earn-out amounts) less your original cost and any allowable deductions.

If you are UK-resident for tax purposes in the tax year the disposal occurs, HMRC taxes the gain. The rate depends on the type of asset and your income:

These rates reflect the changes announced at the October 2024 Budget. They are correct as at the date of this guide but may change; confirm the current rates with a tax adviser before proceeding. All figures in this guide are illustrative.

Business Asset Disposal Relief (BADR), formerly Entrepreneurs' Relief, remains available for qualifying disposals. To qualify, you broadly need: at least 5% of shares and voting rights, officer or employee status, and both conditions met for at least two years before disposal. The lifetime limit is £1 million as at 2026 (it was reduced from £10 million in April 2020). BADR applies whether or not you are UK-resident at the time of disposal, provided the conditions are met. Confirm your qualifying status with a specialist.

Why does the date of exchange matter more than the date of completion?

This is the point most founders miss. For UK CGT purposes, the disposal date for a share sale is the date the unconditional contract is entered into, which is exchange of contracts, not the later completion date.

If you exchange contracts on 10 March, while still UK-resident, and complete on 30 April, after you have left the UK, the gain arises on 10 March. You are UK-resident on that date. UK CGT applies.

The practical implication: if you are planning to sell your business and then move to Dubai, you need to ensure you have genuinely left UK tax residence before exchange, not simply before completion or before the money arrives in your account.

What does it mean to leave UK tax residence?

Non-UK residence is determined by the Statutory Residence Test (SRT). You need to satisfy one of the automatic overseas tests or avoid the automatic UK tests and the sufficient ties test. For someone leaving to live in Dubai, the most common route to non-residence is the full-time overseas work test or, more simply, spending fewer than 16 UK days in the tax year (if you were UK-resident in any of the three preceding years).

The SRT is fact-sensitive. The number of days you can spend in the UK without becoming resident depends on how many UK ties you hold: a property here, family here, a pattern of recent UK days. See our companion guide Becoming Non-UK Tax Resident in Dubai for a full breakdown of the SRT and UK ties.

For CGT planning purposes, the key question is: what is your residence status on the date you exchange contracts? If it is non-resident, and the gain is not otherwise subject to UK CGT (for example, under the rules for UK residential property), the charge should not arise.

What is the temporary non-residence rule, and why does it matter?

Leaving the UK before your business sale removes the CGT charge at the time of the sale. But HMRC anticipated this planning and introduced the temporary non-residence rules (Taxation of Chargeable Gains Act 1992, section 10A).

The rule works as follows: if you were UK-resident for at least four of the seven tax years before your departure, realise certain gains (including gains on assets you owned before leaving) during your period of non-residence, and then return to the UK as a resident, those gains can be assessed in the tax year you return.

The critical threshold is five full UK tax years of non-residence. If your period of non-residence covers five or more complete tax years (6 April to 5 April), the temporary non-residence rules do not apply to gains arising after the end of that fifth year. If you return before completing five full tax years, gains on pre-departure assets that arose during your non-residence can be taxed.

What counts as a "pre-departure asset"? Broadly, shares or other assets you owned before you left the UK. Gains on assets acquired after you left are not caught by the temporary non-residence rules, even if you return within five years.

How does the UAE's 0% CGT interact with this?

The UAE levies no personal capital gains tax. For a genuinely non-UK-resident individual selling a business, and where the temporary non-residence rules do not apply, the UAE position is straightforward: the gain is not taxed.

This does not mean there is no tax exposure. You should check:

• UK source gains: gains on UK residential property are subject to UK CGT for non-residents regardless of the temporary non-residence rules. Different rules apply to commercial property and other UK situs assets held by non-residents.
• UAE corporate tax: if the disposal takes place within a UAE corporate structure rather than personally, UAE corporate tax considerations arise. The 9% rate (or 0% for qualifying free zone income) applies at corporate level; confirm the treatment with a UAE tax adviser.
• The UK--UAE double tax treaty: the treaty allocates taxing rights on capital gains, but for most business sales it confirms the position rather than changing it. Gains on shares in a UK company can generally be taxed only by the country of residence of the seller; if you are UAE-resident, that points away from UK CGT.

The UAE's tax position is one of the reasons a Dubai move before a sale can be so tax-efficient. But it only delivers the expected outcome if the UK CGT position is also resolved correctly.

A worked example

What practical steps should you take before selling?

How do earn-outs and deferred consideration affect the planning?

Earn-outs are common in business sales: part of the price is paid upfront and further amounts depend on future performance. The CGT treatment of earn-outs depends on whether the deferred consideration is ascertainable at the date of disposal.

If the earn-out is ascertainable (a fixed sum, or a sum determinable by a formula from known data), it is generally brought into account at exchange as part of the total consideration. If it is not ascertainable, each earn-out payment may be treated as a separate disposal when received.

This matters considerably for non-residents. If you have left the UK before exchange and the earn-out is treated as a separate disposal at the time you receive each payment, the CGT position on those payments depends on your residence status at each receipt date, and on whether the temporary non-residence rules apply. Structuring a sale with a large contingent earn-out without advice on the CGT consequences is a significant risk.

If you are considering a move to Dubai alongside a sale, discuss the earn-out structure with advisers before you agree heads of terms. A UK tax specialist with cross-border experience can help you structure the consideration in a way that is consistent with your overall tax plan. Our UK founders services page sets out how our team approaches exactly this kind of pre-departure planning.

Is there anything else to consider?

A few further points that apply to specific situations:

Rollover and reinvestment reliefs: if you are reinvesting sale proceeds into a new business, certain reliefs (such as Business Asset Rollover Relief or Investors' Relief) may be relevant. These interact with the residence rules in their own ways.

Company reorganisations: if you are restructuring your company before the sale (for example, creating a holding company, or reorganising share classes), those steps can themselves have CGT consequences. Reorganisations need to be planned well in advance and reviewed by a specialist.

Tax-free reorganisation vs. taxable disposal: some transactions that look like a sale are actually a reorganisation for CGT purposes and are treated differently. Understanding which category your deal falls into is important before you move.

The interaction of UK CGT, the SRT, the temporary non-residence rules, and the timing of a business sale is one of the most technically demanding areas of UK tax. The right outcome is achievable, but it depends entirely on your circumstances and requires careful planning from advisers who understand both sides of the move.

For further background, our guide to becoming non-UK tax resident in Dubai covers the SRT in detail. Our guide to setting up a company in Dubai and UK tax explains the corporate tax side. If you are at the stage of planning a sale alongside a move, speak to our team: we have UK and UAE tax specialists who handle exactly this combination and can advise on your position on both sides.