For UK business owners, selling a company represents one of the most significant financial events of a lifetime. Beyond finding the right buyer and negotiating terms, tax planning is arguably the most critical component of any successful exit strategy.

According to HMRC, Capital Gains Tax (CGT) remains one of the largest tax bills sellers face, with rates currently sitting at 18% for basic rate taxpayers and 24% for higher rate taxpayers on business disposals. However, the tax landscape for business exits has shifted. Most notably, the rate on Business Asset Disposal Relief (BADR), the UK's primary relief for business sellers, increased to 18% from 6 April 2026, up from 14% in 2025/26. This change, combined with existing planning opportunities, makes 2026 an especially important year for business owners to understand their options.

This guide explores the key tax considerations around a business sale, including the range of reliefs available, timing considerations, and structural choices that can significantly impact after-tax proceeds.

How capital gains tax applies to business disposals

When a business is sold, the profit, calculated as the sale price minus the cost base and allowable expenses, is subject to Capital Gains Tax. As outlined by HM Revenue & Customs, the standard CGT rates for individuals in the 2026/27 tax year are:

  • 18% for basic rate taxpayers
  • 24% for higher rate taxpayers

For business owners working toward a sale, it may be valuable to understand that these are baseline rates. The actual tax bill depends on several factors, including whether the seller qualifies for any reliefs, the structure of the sale, and timing considerations.

Business asset disposal relief: the primary relief for sellers

Business Asset Disposal Relief (BADR), formerly known as Entrepreneurs' Relief, remains the most valuable relief available to business sellers. According to HMRC guidance, BADR allows eligible sellers to claim a reduced rate of tax on qualifying disposals.

The 2026 rate change

The BADR rate increased to 18% from 6 April 2026, rising from 14% in the 2025/26 tax year (and 10% before April 2025). This represents a 4 percentage point increase, a significant change for business sellers.

Disposals completing on or after 6 April 2026 attract the 18% rate, and HMRC applies anti-forestalling rules to arrangements designed to straddle the change, so contract and completion dates matter. For sellers currently mid-negotiation, one area worth exploring with an adviser is how the timing and structure of the transaction interact with the rules now in force.

Qualifying for BADR

Under current tax legislation, BADR is available to shareholders and partners who dispose of a substantial shareholding or partnership stake. Key criteria include:

  • The seller must own at least 5% of the company shares (or equivalent partnership stake)
  • The business must have been held for at least two years before disposal
  • The company must be a trading company (not primarily investment-focused)

The lifetime limit on relief

According to HMRC, BADR is subject to a lifetime limit of £1 million. Gains exceeding this threshold are taxed at the standard CGT rates. This ceiling makes it especially important for high-value business exits to understand the full tax landscape and explore complementary planning strategies.

Additional tax planning strategies

Beyond BADR, several other planning techniques exist:

Share sales vs asset sales

The structure of a business sale, whether assets or shares are sold, has significant tax implications. Share sales typically trigger BADR eligibility for the seller, while asset sales can benefit the buyer through stepped-up asset bases. One area worth exploring with an adviser is how both parties' tax positions interact in negotiations.

Holdover relief

For sellers reinvesting proceeds into qualifying business assets or shares in a new venture, holdover relief (also called gift relief) can defer tax liability until those assets are eventually sold. Some sellers have found this structure useful when transitioning to a new business or making follow-on investments.

EIS reinvestment relief

Enterprise Investment Scheme (EIS) reinvestment relief allows sellers to defer or eliminate tax on gains by reinvesting proceeds in new EIS-eligible companies. This is particularly relevant for business owners interested in angel investing or supporting early-stage ventures post-exit.

Pension contributions

Pension contributions made immediately before or after a business sale are another mechanism business owners may find it valuable to explore. Pension contributions are made from pre-tax income (or can reduce taxable gains indirectly through careful structuring), offering a powerful tax deferral mechanism while building long-term wealth.

Advance planning and deferred consideration

Many business sales do not occur as single lump-sum payments. Deferred consideration and earn-outs, where payment is contingent on future business performance, have become increasingly common, particularly in strategic acquisitions.

Tax planning opportunities emerge from these structures. The treatment of deferred payments, earn-outs, and performance-based payments can differ significantly from an initial upfront payment. One area worth exploring with an adviser is how spreading the gain across multiple tax years, or classifying certain consideration as contingent, may affect the overall tax position.

Similarly, advance planning, ideally beginning 12 to 24 months before a sale, allows time to structure affairs, explore reliefs, and potentially make tax-efficient adjustments to shareholdings, corporate structure, or personal circumstances before the transaction completes.

Key takeaways for business sellers in 2026

Selling a business is a transformational event, and tax efficiency is integral to exit strategy planning. For business owners considering a sale in 2026, the key points are:

  • The BADR rate is now 18% (from 6 April 2026), up from 14% in 2025/26. Contract and completion timing around rate changes can still materially affect after-tax proceeds
  • BADR has qualifying criteria and a £1 million lifetime limit, above which standard CGT rates apply
  • Complementary planning options exist, such as structured reinvestment, pension planning, and holdover relief
  • Planning well in advance of a transaction, ideally 12 to 24 months, leaves time to explore all available options
  • A qualified financial adviser and tax professional can coordinate strategy across tax, legal, and financial dimensions

Why IFA Connect?

Selling a business may well be the most complex financial event most people face. The intersection of tax planning, legal structure, negotiations, and personal financial goals demands expert guidance.

IFA Connect specialises in matching business owners with specialist financial advisers who have deep expertise in business exits, tax-efficient structures, and post-sale wealth planning. Whether you're in the early stages of considering a sale or actively in negotiations, our matched adviser can help you navigate the complexities.

Get in touch today to discuss your situation and find the right adviser for your business exit.

Disclaimer

This article is for informational purposes only and does not constitute financial advice. Tax rules can change, and individual circumstances vary significantly. For advice tailored to your specific situation, speak with a qualified financial adviser and tax professional.