By Bill Anderson, FCCA, Chief Executive Officer, Assetica — 2026-07-09
Sell before you leave and Business Asset Disposal Relief caps the CGT on the first tranche. Sell after you leave and the gain can fall outside UK CGT entirely, unless you return within five years and the temporary non-residence rules claw it back. The timing, the valuation date and the sale price decide the tax as much as each other. A valuation-led guide for UK founders.
Selling as a UK resident keeps the disposal inside UK CGT, with Business Asset Disposal Relief taxing qualifying gains at a reduced rate up to a lifetime limit and the balance at the standard rate. Advantages are certainty and cleanliness: no five-year exposure, no treaty questions, no argument about residence on completion day. The valuation work is sale-readiness: normalising earnings for owner costs, defending the multiple against comparable deals, and setting a price corridor before buyers set it.
Once genuinely non-resident under the Statutory Residence Test, a disposal of shares in a UK company is broadly outside UK CGT (UK land and property stays taxable regardless). Three conditions carry the weight: the residence break must be genuine and documented; the disposal must happen after departure, judged by the contract date; and you must stay non-resident more than five full tax years, or the temporary non-residence rules tax the whole gain in the year of return. There is no partial credit.
The rule catches disposals of assets owned before departure, which describes almost every founder selling the company they built, and it does not distinguish a planned return from a forced one. The honest question is whether your life can absorb staying away five full tax years even if circumstances change. Date arithmetic matters at the edges: full tax years are counted, so a late-tax-year departure effectively stretches the wait and an early return shortens the margin for error.
The valuation sets the negotiating corridor, survives buyer due diligence, evidences the gain for HMRC, supports a BADR claim, and fixes the arm's length value for any pre-sale transfers to a spouse, trust or holding company. On the UAE side it feeds the Golden Visa report (stake worth at least AED 2 million, GDRFA format) and any UAE holding structure the proceeds flow into. One valuation date and methodology, formatted for each authority, keeps the file clean.
Do I pay UK capital gains tax if I sell my business after moving to Dubai?
If you are genuinely non-resident when the disposal happens, a sale of shares in a UK company is broadly outside UK CGT. The exception: return to the UK within five full tax years and the temporary non-residence rules tax the gain in the year you come back. UK land and property stays within UK tax regardless of residence.
When exactly is the disposal date for tax purposes?
Generally the date of the unconditional contract, not completion or payment. Signing before you have genuinely left, or before non-residence has begun, puts the gain back inside UK CGT, so sequencing the contract against the residence calendar matters as much as the sale itself.
Is Business Asset Disposal Relief still worth it?
For gains within the lifetime limit, BADR meaningfully reduces the CGT rate and buys certainty against the five-year risk. For gains far above the limit, the marginal saving shrinks and the non-resident route becomes more attractive, provided the five-year commitment is realistic. Model the comparison on your actual numbers.
Does the sale valuation also work for the UAE Golden Visa?
The underlying value does, but the GDRFA needs its own format: an independent report isolating your specific stake, net of debt, against the AED 2 million threshold. Assetica prepares the sale valuation and the GDRFA report from one valuation date and methodology, so the numbers agree everywhere.
How long does the valuation take?
Typically five to seven business days from receiving your UK statutory accounts, shareholding details, management accounts and bank statements. Expedited two to three day delivery is available for transaction deadlines.