Tax implications of selling a business in the UK

Tax is one of those topics that business owners know they should think about early but often leave until late. That's understandable when you're focused on running the business, preparing for sale, and finding the right buyer. But the tax decisions you make, or fail to make, can easily affect your net proceeds by tens or even hundreds of thousands of pounds.

This guide covers the main tax considerations when selling a UK business. It's written to help you ask the right questions and plan ahead, not to replace professional tax advice. Tax rules are complex, change frequently, and depend on your individual circumstances. Please speak with a qualified tax advisor before making any decisions about your sale.

Please note: tax rules can and do change, and the right approach depends entirely on your individual circumstances. Always consult a qualified tax advisor before making decisions about the sale of your business.

What tax do I pay when I sell my business?

The main tax is Capital Gains Tax (CGT). When you sell your shares in a company or dispose of business assets, you pay CGT on the gain, which is the difference between what you originally paid for the shares (or their base cost) and what you sell them for, minus any allowable costs.

The CGT rates for the 2025/26 tax year are 18% for basic rate taxpayers and 24% for higher and additional rate taxpayers. Whether you pay the basic or higher rate depends on your total taxable income plus the gain. For most business owners selling a business of any significant value, the gain will push them into the higher rate band.

There is an annual CGT exemption of £3,000 per person for 2025/26, which is substantially lower than it was a few years ago (it was £12,300 as recently as 2022/23). This exemption is use-it-or-lose-it: it can't be carried forward.

What is Business Asset Disposal Relief?

Business Asset Disposal Relief (BADR), formerly known as Entrepreneurs' Relief, is the most significant tax relief available to business sellers in the UK. It allows qualifying gains to be taxed at a reduced rate, up to a lifetime limit of £1 million.

The BADR rate has changed several times in recent years:

Up to 5 April 2025: 10% 6 April 2025 to 5 April 2026: 14% From 6 April 2026 onwards: 18%

To put that in concrete terms: on a qualifying gain of £1 million, selling in the current tax year (2025/26) at 14% means a tax bill of £140,000. Waiting until after April 2026 means paying £180,000 on the same gain. That's a £40,000 difference. Still a meaningful saving compared to the standard rate of 24% (which would produce a bill of £240,000), but the advantage of BADR is shrinking with each increase.

The £1 million lifetime limit is cumulative. If you claimed relief on a previous disposal, any amount used reduces what's available for future claims.

How do I qualify for BADR?

The qualifying conditions are strict, and HMRC enforces them carefully. For a share sale, you generally need to meet all of the following for a continuous period of at least two years before the date of disposal:

You must hold at least 5% of the ordinary share capital. You must hold at least 5% of the voting rights. You must be an employee or officer of the company. The company must be a trading company (not primarily an investment company).

For sole traders and partners, BADR applies to the sale of the whole or part of the business, provided you've owned and operated it for at least two years.

There are some common traps that catch people out. Dilution of shareholdings below the 5% threshold (for example, through investment rounds) can disqualify you. Companies with significant investment activities alongside their trading operations may fail the trading company test. And the two-year qualifying period must be continuous, with no gaps.

If you're in any doubt about whether you qualify, get specific advice well before you agree a sale. Discovering you don't qualify for BADR after you've completed the transaction is an expensive mistake with no remedy.

Does it matter whether I sell shares or assets?

Yes, significantly, and this is one of the most important structural decisions in any business sale.

Share sale. You sell your shares in the company. The company, with all its assets, contracts, employees, and liabilities, transfers to the buyer. You pay CGT on the gain on your shares, potentially qualifying for BADR. This is usually the preferred route for sellers because it's simpler and typically more tax-efficient.

Asset sale. The company sells its individual assets (goodwill, equipment, client contracts, stock) to the buyer. The company receives the cash, and you then need to extract that cash from the company, usually through dividends or a winding-up distribution. This creates two layers of tax: corporation tax on any gains within the company, and then income tax or CGT when the money comes out to you.

Buyers sometimes prefer asset sales because they can cherry-pick which assets they acquire and potentially claim capital allowances on the purchase price. Sellers almost always prefer share sales for the tax efficiency. In practice, most SME sales in the UK are structured as share sales, but the buyer may push for an asset sale, particularly for smaller businesses or where there are liabilities they don't want to assume.

The allocation of the purchase price across different asset categories (goodwill, tangible assets, stock, restrictive covenants) also affects the tax position for both parties. This is a negotiation point that your tax advisor should be involved in from the start.

What about deferred payments and earn-outs?

If part of your sale price is deferred or contingent on future performance (an earn-out), the tax treatment depends on the structure.

For deferred payments where the amount is fixed and certain, you may be able to elect to pay CGT on the full amount at completion, even though you haven't received it all yet. This can be beneficial if tax rates are expected to rise, but it means paying tax on money you don't yet have in hand.

For earn-outs where the final amount is uncertain, the tax position is more complex. HMRC will typically tax each payment as it's received, and the rate that applies may be the rate in force at the time of receipt, not the time of the original sale. If you agree an earn-out in 2025/26 at 14% BADR but don't receive the earn-out payment until 2026/27, the BADR rate on that portion could be 18%.

This makes earn-out structures particularly important to get right from a tax perspective. The interaction between deal structure and tax timing is exactly the kind of detail that a specialist advisor can help you navigate.

Can I reduce my tax bill through planning?

There are several legitimate planning opportunities, but they all require advance preparation.

Spousal transfers. If your spouse or civil partner is also a shareholder, their gain is taxed separately, with their own BADR lifetime limit and annual exemption. Transferring shares between spouses before a sale can be done at no gain/no loss, effectively doubling the available reliefs. However, this must be a genuine transfer, done well in advance, and the recipient must meet the qualifying conditions independently. Last-minute transfers that look like they're purely tax-motivated will attract HMRC scrutiny.

Timing. With BADR rates changing, the timing of your disposal can have a direct financial impact. Completing before April 2026 locks in the 14% rate. But as we've said elsewhere, chasing a tax deadline at the expense of a properly prepared sale usually costs more than it saves.

Using losses. If you have capital losses from other disposals, these can be set against your gain before CGT is calculated. Losses from the current year must be used first, and any unused losses from previous years can be carried forward indefinitely.

Annual exemption. The £3,000 annual exemption is modest but should be used. If both you and your spouse are shareholders, that's £6,000 off the taxable gain.

Employee Ownership Trusts. Selling to an EOT has been an increasingly popular route because, until recently, gains on qualifying sales to an EOT were entirely exempt from CGT. However, the November 2025 Budget reduced this relief to 50% exemption, and the rules around EOTs are tightening. It remains a viable option for some businesses, particularly those where the owner wants the team to take over, but the tax advantage is no longer as clear-cut as it was.

What other taxes should I be aware of?

Stamp duty. On a share sale, the buyer typically pays stamp duty at 0.5% of the purchase price. This isn't your cost, but it's worth knowing about as it affects the buyer's total outlay.

VAT. The sale of shares is exempt from VAT. An asset sale may have VAT implications depending on which assets are included. If the sale qualifies as a Transfer of a Going Concern (TOGC), VAT is not charged, but the conditions must be met precisely.

Corporation tax. Relevant if you're doing an asset sale, as any gains on assets sold within the company will be subject to corporation tax before you can extract the proceeds.

Income tax. If part of the sale consideration is allocated to a consultancy or restraint-of-trade payment, that element may be taxed as income rather than capital gains. The allocation of the purchase price across different categories is something your advisor should review carefully.

When should I start planning?

At least twelve months before you expect to sell, and ideally earlier. Tax planning isn't something you can bolt on at the end of the process. The qualifying conditions for BADR require a two-year holding period. Spousal transfers need time to be credible. And understanding the interplay between deal structure, timing, and tax rates requires analysis that's best done before you're in the middle of a negotiation.

When we work with sellers, one of the first things we suggest is a conversation with a specialist tax advisor. Not a general accountant (though they're valuable too), but someone who specifically advises on business disposals. The fee for that advice is typically a few thousand pounds. The savings it produces are almost always a multiple of that.

This guide is for general information only and does not constitute tax advice. Tax rules can change, and the right approach depends entirely on your individual circumstances. Always consult a qualified tax advisor before making decisions about the sale of your business.