UK Business Asset Disposal Relief at 18%: the anti-forestalling trap

The relief that is quietly being taken away

A founder selling a business this year is watching the calendar as closely as the term sheet, and with reason. For most of the last fifteen years, selling a qualifying UK business meant paying Capital Gains Tax at 10% under Entrepreneurs' Relief and its successor, Business Asset Disposal Relief. That rate is now being withdrawn in stages: it rose to 14% in April 2025 and reaches 18% in April 2026. The relief that once made a business exit one of the most lightly taxed events in a founder's life is being turned, a few points at a time, into something closer to an ordinary capital gain.

The predictable response has been a rush to complete before each rate rise, and the equally predictable counter has been a set of anti-forestalling rules waiting for the contracts written to beat the deadline. This is the UK side of the same decision the rest of this cluster examines from Ireland, where Revised Entrepreneur Relief has held its 10% rate and raised its ceiling. For a founder with a genuine connection to both countries, the widening gap between a UK exit and an Irish one is no longer academic. This article sets out the climbing rate, the conditions, the contract-date rule that made forestalling possible, the anti-forestalling trap that punishes it, and the cross-border comparison that closes the cluster.

What BADR does, and the rate that is climbing

Business Asset Disposal Relief reduces the Capital Gains Tax rate on qualifying business disposals, but the reduction is shrinking, and the rate now depends on when the disposal falls. The relief applies to the first £1 million of qualifying gains over a person's lifetime, and above that limit the ordinary Capital Gains Tax rates apply. What has changed is the reduced rate itself, on a fixed schedule set at the Autumn 2024 Budget and confirmed in HMRC's guidance. The table shows the position by disposal date, and the tax on a £1 million gain at each stage.

The direction is one-way, and the arithmetic is the reason for the rush. A founder selling a business with a £1 million qualifying gain pays £80,000 more in tax on a disposal after 6 April 2026 than on the same disposal two years earlier. For a serial entrepreneur who has used part of the lifetime limit before, or whose gain exceeds £1 million so that the balance is taxed at the standard 24%, the relief is worth less than it was and worth protecting where it applies. The £1 million lifetime limit itself is unchanged; it is the rate on that £1 million that has moved.

The conditions that are easy to fail

The relief is only available where the seller has met a set of conditions throughout the two years before the sale, and a founder who drifted out of one of them can lose it without noticing. For a disposal of shares in a trading company, the individual must, throughout the two-year period ending with the disposal, hold at least 5% of the ordinary share capital and at least 5% of the voting rights, be an officer or employee of the company or a group company, and satisfy an economic-interest test, broadly a right to at least 5% of distributable profits and assets on a winding up, or of the proceeds on a sale of the whole company. For a disposal of a sole trade or a partnership interest, the business must have been owned for at least two years before the disposal.

Two of these trip people up in practice. The 5% economic-interest test, added to the older share-and-votes test, can be failed where a company has multiple share classes or where an investment round has diluted a founder below the threshold, so a founder who was comfortably over 5% at incorporation may not be at exit. And the officer-or-employee condition catches the founder who stepped back from the business, resigned a directorship, or moved to a purely advisory role more than the qualifying period before the sale. The conditions are not onerous, but they run over two years and have to be true throughout, which means they are a matter for planning well before a buyer is in sight, not for checking on the eve of completion.

Why the contract date matters: section 28

The date that fixes the rate is the date of the contract, not the date the deal completes, and that single rule is what made beating the deadline possible. Under section 28 of the Taxation of Chargeable Gains Act 1992, where an asset is disposed of under a contract, the disposal is treated as taking place when the contract is made, not when the asset is conveyed or transferred, provided the contract is unconditional. Where the contract is conditional, the disposal date is when the condition is satisfied. Completion, the moment money and shares actually change hands, is not the relevant date for an unconditional contract.

The consequence for a rate change is straightforward, and founders and their advisers spotted it immediately. A share sale that will complete after 6 April 2026, and so would ordinarily be taxed at 18%, could in principle be fixed at the earlier date, and the lower rate, by entering into an unconditional contract before that date, even if completion, due diligence and payment all followed weeks or months later. Sign the contract in March to secure the 14% rate; complete in the summer at the 14% rate. That is forestalling, and it is precisely the manoeuvre the next section is built to stop.

The anti-forestalling trap

Anti-forestalling rules take away the benefit of the early contract in the cases most likely to be planning rather than commerce, and they do so by re-dating the disposal to completion. Where a contract is entered into before a rate change but not completed until after it, the rules broadly deny the earlier disposal date in two situations: where the parties to the contract are connected, and where a main purpose of entering into the contract when it was entered into was to obtain the lower rate and the contract was not entered into for genuine commercial reasons. In those cases the disposal is treated as taking place at completion, so the later, higher rate applies, and the taxpayer is required to include a statement to that effect, with the relevant particulars, in the tax return.

This is where the calendar-driven deal meets the enquiry. A genuine third-party sale, negotiated at arm's length and signed before the deadline for ordinary commercial reasons, is not caught; the parties are not connected, and the commercial purpose is real. The arrangement that is caught is the one papered in a hurry, often between connected parties or within a family or management group, whose only real driver was the rate. A founder who signs an unconditional contract to beat April, without a genuine commercial reason for signing when they did, is not locking in the lower rate; they are setting up a conversation with HMRC in a later enquiry, in which the burden of showing the commercial purpose falls on them. The rules do not forbid completing a sale after a rate rise. They forbid pretending it happened earlier than it did.

Ireland's 10% and the residence question

As the UK rate climbs, Ireland's equivalent relief has held at 10%, and for a founder with a real choice of residence the gap is now large enough to matter. Ireland's Revised Entrepreneur Relief, examined as the hub of this cluster in the analysis of the 10% Irish exit, charges 10% on a lifetime limit that rose to €1.5 million in 2026. UK Business Asset Disposal Relief charges 18% from April 2026 on £1 million. On the reliefs alone, an Irish exit is now both lower-rated and available on a larger gain than a UK one.

The comparison is real but it is not a licence to move for a rate. Which country taxes a disposal depends on where the seller is tax resident when the disposal happens, and that is decided by each country's own rules, not by preference; the UK position turns on the Statutory Residence Test, and a founder who leaves the UK and sells shortly afterwards has to reckon with the temporary non-residence rules, which can pull a gain realised during a short absence back into UK tax on return. Moving residence to capture a lower rate on an imminent sale is exactly the kind of arrangement those rules exist to test. The honest use of the comparison is strategic and long-term: a founder building a business over years, genuinely mobile between the two countries, can weigh where they will be resident when they eventually sell. The dishonest use, a residence flip timed to a specific deal, tends to fail on both sides of the water.

What a business owner should do before a sale

The relief rewards the owner who prepares, and with the rate climbing the preparation is worth more than it was. The steps are to confirm the qualifying conditions, the 5% share, voting and economic tests and the officer-or-employee condition, are met throughout the two years before any sale, and to fix any gap early rather than at the deal; to model the tax at the rate for the likely completion date, not the rate the owner remembers; and, where the gain exceeds £1 million or the lifetime limit is partly used, to plan for the standard rate on the balance. Where a sale straddles a rate-change date, the contract and completion dates should be handled on genuine commercial terms, with the anti-forestalling rules understood, rather than papered to manufacture an earlier disposal.

For the genuinely cross-border founder, the residence question belongs in the same plan, settled over years and not around a single transaction. The relief that made a UK business exit a 10% event is becoming an 18% one, and the temptation to run ahead of the change is exactly what the anti-forestalling rules are built to catch. The rate a founder pays on selling their business is no longer a fixed feature of the UK system; it is a moving number that rewards planning and punishes the scramble. Business Asset Disposal Relief is not the relief it was. It is a shrinking one, and the way to protect what remains of it is to earn it over the two years before the sale, not to chase it in the weeks before a deadline.

Frequently asked questions

What is the Business Asset Disposal Relief rate in 2026?

For disposals on or after 6 April 2026 the rate is 18%. It was 10% up to 5 April 2025, 14% for disposals from 6 April 2025, and 18% from 6 April 2026, applied to the first £1 million of qualifying gains over a person's lifetime. Gains above the £1 million lifetime limit are taxed at the ordinary Capital Gains Tax rates. The reduced rate has therefore risen from 10% to 18% over two years, while the £1 million lifetime limit itself is unchanged.

Is the disposal date the contract date or completion?

The contract date, for an unconditional contract. Under section 28 of the Taxation of Chargeable Gains Act 1992 a disposal under an unconditional contract is treated as taking place when the contract is made, not when it completes. For a conditional contract, the disposal date is when the condition is satisfied. This is why a contract signed before a rate rise can, in principle, fix the earlier, lower rate even though completion follows later, subject to the anti-forestalling rules.

What are the anti-forestalling rules for BADR?

They deny the benefit of an early contract date in defined circumstances where a contract is entered into before a rate change but completes after it. Broadly, where the parties are connected, or a main purpose of entering the contract when it was entered was to obtain the lower rate and there was no genuine commercial reason for the timing, the disposal is treated as taking place on completion, at the higher rate, and the taxpayer must declare the relevant particulars in the tax return. A genuine arm's-length sale signed before the deadline for commercial reasons is not caught.

What are the conditions for Business Asset Disposal Relief?

For a disposal of shares, throughout the two years ending with the disposal the individual must hold at least 5% of the ordinary share capital and voting rights, be an officer or employee of the company or a group company, and meet an economic-interest test, broadly a right to at least 5% of distributable profits and assets or of the sale proceeds. For a sole trade or partnership interest, the business must have been owned for at least two years. The conditions must be satisfied throughout the qualifying period, not merely at the sale.

Can I still lock in the lower rate by signing a contract early?

Only if the arrangement is genuine. For a real arm's-length sale, an unconditional contract signed before a rate rise can fix the earlier rate under section 28, even if completion follows. But if the parties are connected, or a main purpose of the timing was to secure the lower rate without a genuine commercial reason, the anti-forestalling rules re-date the disposal to completion at the higher rate. Signing early purely to beat the deadline, without a commercial driver, does not reliably secure the lower rate and must be declared.

How does BADR compare with Ireland's Entrepreneur Relief?

Ireland's Revised Entrepreneur Relief now compares favourably. It charges 10% on a lifetime limit that rose to €1.5 million in 2026, while UK Business Asset Disposal Relief charges 18% from April 2026 on a £1 million limit. On the reliefs alone, an Irish exit is both lower-rated and available on a larger gain. But which country taxes a disposal depends on the seller's tax residence at the date of sale, decided by each country's own residence rules, so the comparison matters only where a founder has a genuine, long-term choice of residence.

Does moving abroad before selling avoid the higher rate?

Not reliably, and not around a single deal. Whether the UK taxes a gain depends on residence at the date of disposal under the Statutory Residence Test, but a person who leaves the UK and sells within a short period can be caught by the temporary non-residence rules, which charge the gain on their return. A residence move timed to a specific imminent sale is exactly the kind of arrangement those rules are designed to counter. A genuine, long-planned change of residence is a different matter from a flip engineered for one transaction.

What should I do before selling my business?

Confirm the qualifying conditions are met throughout the two years before any sale, and fix any shortfall, on shareholding, voting rights, the economic-interest test or the officer-or-employee condition, well before a buyer appears. Model the tax at the rate for the expected completion date rather than the rate you remember, and plan for the standard rate on any gain above the £1 million lifetime limit. Where a sale straddles a rate change, handle the contract and completion on genuine commercial terms with the anti-forestalling rules in mind, rather than papering an early date.

---

Business Asset Disposal Relief used to be the reward for building a UK business: a 10% rate on the way out. It is being withdrawn a few points a year, it reaches 18% in April 2026, and the anti-forestalling rules mean the rate cannot simply be back-dated by a contract signed to beat the calendar. Meanwhile, across the water, Ireland has held its 10% and raised its ceiling, so for the genuinely mobile founder the two exits have pulled apart. The relief is no longer a fixed feature of a UK sale. It is a shrinking one, earned over the two years before the deal and protected only by planning, not by the scramble to sign before the deadline.

Critical advisory. The jurisdictional frameworks set out above carry strict liability and retroactive tax exposure. Executing these structures without institutional-grade tax architecture is a primary trigger for HMRC and Revenue audits. To mitigate systemic risk and discuss bespoke structuring, initiate a confidential briefing with our Managing Partners.