Capital Gains Tax in 2026: A Simple Guide for UK Business Owners

By Sam

If you are a small business owner in the UK, the landscape of taxation is constantly shifting. As we move through 2026, one area that has seen significant discussion and adjustment is Capital Gains Tax (CGT). Whether you are planning to sell your company, dispose of business assets, or transfer shares, understanding how much you will owe the taxman is essential for your financial planning.

At Accountant Search, we know that tax jargon can be overwhelming. This guide is designed to strip away the complexity and provide a clear, practical overview of Capital Gains Tax for UK SMEs in 2026.

What is Capital Gains Tax?

Capital Gains Tax is a tax on the profit you make when you sell (or "dispose of") an asset that has increased in value. It is the gain you make that is taxed, not the total amount of money you receive. For business owners, "disposal" doesn't just mean selling for cash; it can also include giving away an asset as a gift or swapping it for something else. If you are preparing for a sale, our guide to Selling Your Business? A Simple Guide to UK Capital Gains Tax in 2026 offers more context on how disposals are taxed.

In 2026, the rules for business owners are particularly focused on ensuring that those who have built value in their companies over many years are taxed fairly, while also maintaining incentives for entrepreneurship.

The 2026 CGT Rates for Business Owners

The rates for Capital Gains Tax can vary depending on your total taxable income and the type of asset you are selling. For the 2026/27 tax year, the rates have been streamlined, but there are specific nuances for business owners.

Standard Rates

If you are selling assets that do not qualify for special reliefs, the following rates apply:

• Basic Rate Taxpayers: If your total income and gains fall within the basic rate band, you will generally pay 18% on your gains.

• Higher and Additional Rate Taxpayers: If your income and gains exceed the basic rate threshold, the rate increases to 24%.

Business Asset Disposal Relief (BADR)

For many small business owners, Business Asset Disposal Relief (formerly known as Entrepreneurs' Relief) is the most critical factor. This relief is designed to reward long-term business investment.

As of April 2026, the rate for qualifying BADR gains is 18%. While this is higher than the historical 10% rate from several years ago, it still offers a significant advantage over the standard 24% higher rate. For a closer look at how this relief works, see Business Asset Disposal Relief 2026.

There is a lifetime limit on BADR of £1 million. This means that throughout your life, you can benefit from this lower rate on up to £1 million of qualifying capital gains. Once you exceed this limit, any further business gains will be taxed at the standard rates.

The Annual Exempt Amount: Your Tax-Free Allowance

Every individual in the UK has an annual tax-free allowance for capital gains, known as the Annual Exempt Amount.

For the 2026/27 tax year, this allowance is £3,000.

This means that the first £3,000 of your total gains in the year are completely tax-free. If your total gains for the year are below this threshold, you don't even need to report them to HMRC (unless you are already registered for Self-Assessment and your total proceeds are more than four times the allowance).

It is important to remember that this is a "use it or lose it" allowance. You cannot carry over any unused portion of your £3,000 allowance to the next tax year. If you are a limited company owner, strategic planning around this allowance is vital.

How to Calculate Your Capital Gain

Calculating your gain might seem simple: subtracting what you paid from what you received: but there are several allowable costs that can reduce your tax bill.

The Basic Formula:

Sale Proceeds – (Purchase Price + Allowable Costs) = Capital Gain

What are Allowable Costs?

You can deduct several expenses from your gain to reduce the amount of tax you owe:

1. Improvement Costs: Money spent on improving the asset (not just maintaining or repairing it).

2. Professional Fees: This includes the cost of solicitors, valuers, and surveyors required for the sale.

3. Advertising Costs: Any money spent marketing the asset for sale.

4. Stamp Duty: If you paid Stamp Duty when you originally bought the asset.

Example Calculation

Imagine you started a small consultancy firm five years ago. You are now selling your shares in that company for £150,000.

• Original Investment: £10,000

• Legal Fees for Sale: £5,000

• Total Gain: £150,000 - £10,000 - £5,000 = £135,000

• Minus Annual Allowance: £135,000 - £3,000 = £132,000 (Taxable Gain)

If this sale qualifies for BADR, you would pay 18% tax on the £132,000, resulting in a tax bill of £23,760. Without BADR, as a higher-rate taxpayer, you could be looking at 24%, which would be £31,680.

Qualifying for Business Asset Disposal Relief (BADR)

Because the 18% BADR rate is so beneficial, it’s important to know if you qualify. Generally, you can claim BADR if you are disposing of:

• All or part of your business as a sole trader or partner.

• Assets that were used in your business when it closed.

• Shares or securities in a company where you have at least 5% of shares and voting rights (and are an employee or office holder).

There are strict time limits: usually, you must have owned the business or shares for at least two years before the date of sale. Given the complexities, we always recommend speaking to a specialist tax accountant to ensure you meet the criteria before proceeding with a sale.

Reporting and Paying Your Tax

In 2026, HMRC has further digitised the reporting process. Most business owners will report their capital gains through their annual Self-Assessment tax return.

However, if you have sold residential property that wasn't your main home (even if it was used for business), the rules are much stricter. You must report and pay the tax due within 60 days of the completion of the sale.

For standard business assets and shares, the tax is generally due by the 31st of January following the end of the tax year in which the gain was made. For a sale in the 2026/27 tax year, your deadline would be 31 January 2028.

When to Get Professional Advice

Tax legislation in the UK is notoriously dense. While this guide provides a simple overview, your specific situation might involve:

• Capital Losses: Offsetting losses from previous years or other assets against your current gains.

• Gifting Assets: Calculating "market value" when transferring assets to family members.

• Overseas Assets: Navigating double taxation treaties if you sell assets held abroad.

• Incorporation: Moving from a sole trader to a limited company can trigger CGT events.

Trying to navigate these waters alone can lead to expensive mistakes or missed opportunities for relief. Whether you are based in London, Surrey, or anywhere else in the UK, professional advice is the best investment you can make.

Conclusion

Capital Gains Tax in 2026 remains a significant consideration for every UK business owner. With the annual allowance set at £3,000 and the BADR rate at 18%, there are clear pathways to managing your tax liability effectively.

The key to a successful, tax-efficient exit or asset disposal is early planning. By understanding your potential liabilities now, you can structure your affairs to make the most of the available reliefs and allowances.

If you’re planning a sale and need to find a local expert who understands the 2026 tax landscape, we can help. If you are also budgeting for support, read How Much Do Accounting Services Cost in the UK? before you request a quote today and we will match you with the perfect accountant for your business needs.