Capital Gains Tax When Selling a Business UK

Capital Gains Tax Basics for Business Sales

When you sell a business in the UK, the profit you make — the difference between what you originally invested and what you receive on sale — is subject to Capital Gains Tax (CGT). For most business owners, this will be the largest single tax event of their lives, making proper understanding and planning essential.

CGT applies differently depending on whether you're selling shares in a limited company or the underlying assets of a business. The structure of the deal has profound tax implications for both buyer and seller, which is why tax advice should be sought early in the exit planning process — not after terms have been agreed.

CGT Rates for 2025/26

For the 2025/26 tax year, CGT rates on business assets are:

• 10% for basic rate taxpayers (or gains qualifying for Business Asset Disposal Relief)
• 20% for higher and additional rate taxpayers

The annual CGT exemption for individuals has been reduced to £3,000, meaning virtually all business sale proceeds will be subject to CGT. The rate you pay depends on your total taxable income and gains in the year of disposal — the gain is effectively "stacked" on top of your income to determine how much falls within each tax band.

For a business sold at a gain of £5 million, the difference between paying 10% (with BADR) and 20% is £500,000 — a compelling reason to ensure you qualify for every available relief.

Business Asset Disposal Relief (BADR)

Business Asset Disposal Relief (formerly Entrepreneurs' Relief) is the most significant tax relief available to UK business sellers. It reduces the effective CGT rate to 10% on qualifying gains, potentially saving hundreds of thousands of pounds.

Eligibility Criteria

To qualify for BADR, you must meet all of the following conditions for at least two years before the sale:

• You must be an officer or employee of the company (typically a director)
• The company must be a trading company (not primarily an investment or property holding company)
• You must hold at least 5% of the ordinary share capital and voting rights
• You must be entitled to at least 5% of the company's distributable profits and net assets on winding up

These criteria seem straightforward but can be surprisingly easy to fail. Complex share structures, recent share reorganisations, or significant non-trading activities (such as holding investment properties within the trading company) can all jeopardise BADR qualification.

The £1 Million Lifetime Limit

BADR is subject to a £1 million lifetime limit on qualifying gains. This means the 10% rate applies to the first £1 million of lifetime qualifying gains only — any excess is taxed at the standard 20% rate. If you've previously claimed BADR on other disposals, the remaining allowance will be reduced accordingly.

For business owners with gains significantly exceeding £1 million, the relief still provides a meaningful tax saving (up to £100,000), but additional planning strategies become important to manage the overall liability.

Allowable Deductions and Costs

Before calculating your CGT liability, you can deduct certain allowable costs from the sale proceeds:

• Original acquisition cost: The price you paid for shares or the business, including any capital subscribed
• Enhancement expenditure: Capital investments that added value to the business (not revenue expenses)
• Transaction costs: Professional fees directly related to the acquisition and disposal — legal fees, broker fees, accountancy fees, and valuation costs

Maintaining clear records of these costs throughout your ownership period can reduce your taxable gain materially. Many business owners lose legitimate deductions simply because they can't evidence costs incurred years ago.

Tax Implications: Share Sale vs Asset Sale

The choice between a share sale and an asset sale has significant tax consequences for both parties. Our valuation guide touches on deal structuring, but the tax dimension deserves specific attention:

Share sale (usually preferred by sellers): You sell your shares and pay CGT on the gain. BADR may apply. Clean, simple, and tax-efficient for the seller. The buyer inherits all of the company's history, including any latent tax liabilities.

Asset sale (usually preferred by buyers): The company sells its individual assets. The company pays Corporation Tax on the gain, and you then need to extract the proceeds — typically through a members' voluntary liquidation, which may qualify for BADR treatment. The process is more complex and may result in higher overall tax for the seller, but offers the buyer a cleaner acquisition with tax-deductible goodwill.

Tax on Deferred Consideration and Earn-Outs

Many business sales include deferred payments or earn-outs, where part of the price depends on future performance. The tax treatment of deferred consideration is complex and depends on the structure:

• Fixed deferred payments (a known amount payable on a future date) are typically taxed as part of the disposal proceeds at completion, even though the cash hasn't been received yet.
• Contingent payments (amounts depending on future performance) may be taxed under the Marren v Ingles principle, creating a separate CGT event when each payment is determined or received.
• Earn-outs structured as employment income may be subject to income tax and National Insurance rather than CGT — a significantly worse outcome for the seller.

The structuring of deferred consideration requires careful tax advice. Getting it wrong can result in paying CGT upfront on money you haven't received, or — worse — having earn-out payments taxed as employment income at rates up to 45%.

Practical Tax Planning Strategies

Effective tax planning should begin 2-3 years before a sale. Key strategies include:

• Ensure BADR qualification: Review shareholdings, employment status, and trading activity well in advance. Address any issues early.
• Consider spousal transfers: Transferring shares to a spouse before sale can utilise their CGT annual exemption and lower tax bands, provided the transfer is genuine and made sufficiently in advance.
• Pension contributions: Using sale proceeds to make pension contributions can provide income tax relief and remove assets from your estate for inheritance tax purposes.
• EIS reinvestment relief: Investing in qualifying Enterprise Investment Scheme shares can defer CGT on business sale gains, though these investments carry risk and shouldn't be made purely for tax reasons.
• Timing the disposal: If the sale spans a tax year boundary, structuring completion timing can optimise annual exemptions and tax band utilisation.

At VAMOS, we work alongside your accountant and tax adviser to ensure deal structure and timing are optimised for tax efficiency. The sale price matters, but the after-tax proceeds are what you actually keep.

Frequently Asked Questions