reading time: 4 mins
If you are a business owner in the UK, your eventual exit is likely your biggest single payday. For years, selling your company was one of the most tax-efficient ways to build wealth.
But the rules changed on 6th April 2026. And if you are planning to sell, those changes just made your exit significantly more expensive.
Here is what has changed, why it matters for your retirement plans, and how strategic exit planning can protect your hard-earned cash from HMRC.
The 4% Warning: What Just Changed?
Historically, when you sold your business, you could claim Business Asset Disposal Relief (BAD – previously known as Entrepreneurs’ Relief). This reduced the Capital Gains Tax you paid down to just 10% on the first £1 million of lifetime gains.
That was the old world.
From 6th April 2026, the rate has increased to 18%.
For a standard business sale of £500,000, that 8% jump (from 10% to 18%) means an extra £40,000 going to HMRC instead of into your pension.
For a sale of £1 million, that is an £80,000 tax hike.
Why is HMRC doing this?
The Government views Business Asset Disposal Relief as a tax break that has not been keeping up with the wider tax system. As corporate tax rates have risen, the gap between the standard 20% Capital Gains rate and the 10% relief became too large.
In simple terms: HMRC believes business owners have had a very good run, and now they want a larger slice of the sale proceeds.
The “Hidden” Penalty for Waiting
The biggest risk right now is inaction.
If you were sitting on the fence about selling your business, waiting even six months could cost you tens of thousands of pounds in additional tax.
However, rushing a sale without planning is equally dangerous. A poor deal structure can cost you more than the tax relief saves you.
Three Immediate Steps for Exit Planning in 2026
You cannot change the tax rate back to 10%. But you can use legitimate planning strategies to reduce your overall exposure.
1. Check Your Lifetime Limit
Relief is still capped at £1 million of lifetime gains. If you have already sold a business in the past, you may have already used up some of your allowance. Review your previous disposals immediately.
2. Review Your Share Structure
If you operate as a sole trader or partnership, you do not qualify for Business Asset Disposal Relief at all (only limited company shareholders do). Moving to a limited structure takes two years to qualify for relief. If you are planning an exit in 2028, you need to incorporate in 2026.
3. Consider an Earn-Out vs. Fixed Price
If a buyer wants to tie your payout to future performance (an “earn-out”), the tax treatment can differ from a fixed sale. With rates at 18%, structuring your deal to qualify for reinvestment relief or spreading gains across multiple tax years could lower your effective rate.
The Bottom Line
Selling your business is still a wonderful financial milestone. An 18% tax rate is historically low compared to the 28% rate paid by landlords or the 45% rate paid on dividends.
But ignoring the change is a costly mistake. The days of “automatic” 10% tax relief are over.
You need an exit plan, not just a sales agreement.
Ready to protect your sale proceeds?
Every business sale is unique. A lower rate is useless if you breach shareholder rules or sign a poor deal.
With over £10 million in successful business sales for our clients, we help UK business owners face the 2026 tax landscape — jargon-free.
Book a confidential “Exit Planning Review” – no obligation, just clarity on what you will actually walk away with after tax.