The UK has already moved capital gains tax in one direction. The October 2024 Budget raised the main CGT rate from 20% to 24% on gains above the basic rate band. Business Asset Disposal Relief (BADR), which applies to the first GBP1 million of lifetime gains on qualifying business sales, rose from 10% to 14% immediately, and reaches 18% from 6 April 2026.
These are already-confirmed increases. They are not conjecture. They are law.
What is conjecture, but increasingly credible conjecture, is the possibility that Andy Burnham's government goes further and aligns capital gains tax rates with income tax rates. This is not a new idea. The Institute for Fiscal Studies has advocated it for years. Wes Streeting, a potential Chancellor in a Burnham government, has publicly supported alignment, albeit with concessions for "genuine entrepreneurship and reinvestment."
Grant Thornton's analysis of Burnham's positioning notes that his recurring theme is that "the UK taxes work more heavily than wealth, and that this needs to be rebalanced." Capital gains, as a tax on wealth appreciation rather than labour, is exactly the kind of tax that fits this framing.
Dan Neidle at Tax Policy Ltd, writing on 3 July 2026, identified CGT as "the single largest way to raise tax without breaking pre-election promises." Labour's manifesto committed not to raise income tax, National Insurance, VAT, or corporation tax. Capital gains tax was not on that list. Neidle estimates that CGT reform could raise over GBP6 billion annually.
This article is about what alignment would mean for anyone planning to sell a business, and why the timing of that decision matters more than it usually does.
What alignment would look like
Currently, the gap between CGT and income tax on higher-rate taxpayers is significant. The CGT main rate from April 2026 is 24% on gains above the basic rate band. The income tax higher rate is 40% on income between GBP50,270 and GBP125,140. The income tax additional rate is 45% on income above GBP125,140, potentially 50% under Burnham.
Full alignment would mean CGT on business sales at 40% or 45% (or 50%), instead of the current 24%. For someone selling a business with a GBP500,000 gain: the BADR rate at 18% means GBP90,000 tax and GBP410,000 net to the seller. The CGT main rate at 24% means GBP120,000 tax and GBP380,000 net. Full alignment at 40% means GBP200,000 tax and GBP300,000 net. Full alignment at 45% means GBP225,000 tax and GBP275,000 net. Full alignment at 50% means GBP250,000 tax and GBP250,000 net.
The difference between the current BADR rate and full alignment at 50% is GBP160,000 on a GBP500,000 gain. That is 32% of the sale price, moving from the seller's pocket to the Treasury's.
For a GBP2 million gain, the difference between BADR at 18% and alignment at 45% is GBP540,000. More than half a million pounds that stays with the owner if they sell before alignment, and goes to HMRC if they sell after.
The PAYE comparison that makes this stark
To understand why alignment matters so much, it helps to compare the full tax lifecycle of an employee and a business owner on the same economic value.
Consider two people who each generate GBP300,000 over a year. One is a PAYE employee on a GBP300,000 salary. The other is a business owner whose company makes GBP300,000 in pre-tax profit.
The PAYE employee pays approximately GBP125,000 in income tax and National Insurance. Net take-home: approximately GBP175,000. If they invest that money in stocks and sell the portfolio years later, they pay CGT at 24% on the gain. Every pound they invested was taxed at 40% to 45% before it was invested, and then the growth is taxed again at 24% when they sell.
The business owner pays 25% corporation tax on the GBP300,000 profit (GBP75,000), leaving GBP225,000 in the company. If they extract what they need for living costs and leave the rest to compound within the business, the retained earnings are taxed only at 25%. When they eventually sell the business, they pay CGT at 18% (BADR) or 24% (main rate) on the gain.
The total tax lifecycle for the employee is roughly 40% to 45% on income plus 24% on investment growth. For the business owner, it is 25% on profits plus 18% to 24% on the sale gain. That is a 15 to 20 percentage point difference on every pound, across an entire career of compounding.
Alignment would compress this advantage significantly. If CGT moves to 40% or 45%, the business owner's exit tax roughly doubles, and the gap between owning and earning narrows. The structural advantage of business ownership shrinks but does not disappear, because the corporation tax rate (25%) on retained profits is still lower than the higher income tax rate (40%), and reinvestment still happens pre-personal-tax.
The BADR question
Business Asset Disposal Relief is the critical variable. It currently applies to the first GBP1 million of lifetime qualifying gains at a reduced rate (rising to 18% from April 2026). If alignment happens, BADR could be reformed in several ways.
It could be retained with a higher rate. BADR stays as a concept but the rate increases. Instead of 18%, it could move to 25% or 30%. Blick Rothenberg's analysis suggests this middle ground is plausible.
The lifetime limit could be reduced. The GBP1 million lifetime limit has already been cut from GBP10 million. It could be reduced further, to GBP500,000 or GBP250,000, or removed entirely.
It could be abolished entirely. The most aggressive scenario. All gains on business sales taxed at the aligned rate with no relief. This would be politically controversial but fiscally significant.
There could be a carve-out for reinvestment. Streeting has suggested concessions for "genuine entrepreneurship and reinvestment." This could mean a lower rate for founders who reinvest proceeds into another business, or a rollover structure that defers the gain if the money goes into a qualifying investment.
Each scenario has different implications, but the direction is consistent. The relief that makes selling a business tax-efficient is narrowing, and the rate that applies after relief is rising.
Why timing matters now
The combination of factors in 2026 creates a window that may not stay open.
The BADR increase to 18% is already confirmed for April 2026. Owners who sell before then pay 14%. Owners who sell after pay 18%. That ship has largely sailed for most transactions, but it signals the direction.
A Burnham government could announce CGT reform in an autumn 2026 Budget. If alignment is announced, there will typically be a period between announcement and implementation. Historically, this window has ranged from a few weeks to several months. Owners who have been considering a sale and who act during this window could still access the current rates.
The succession wave is already building. 808,000 UK businesses with sole directors aged 60 or above. Many owners are already thinking about exit. If they perceive that tax rates are about to increase, the rational response is to accelerate the sale. This could create a surge of motivated sellers in 2026 and 2027, followed by a contraction as the most motivated owners have already sold.
Buyers who are ready have the advantage. If a wave of owners accelerates their exit timeline to beat a tax change, the buyers who have already built their target list, enriched their contacts, and started outreach conversations will be positioned to move quickly. Buyers who start from scratch when the announcement is made will be competing with everyone else who had the same idea.
For owners thinking about exit
If you own a business and are considering selling within the next five years, the current tax environment is likely the most favourable you will operate in for the foreseeable future. Every signal points toward higher rates, narrower relief, and a larger Treasury share of your exit proceeds.
The practical steps are straightforward. Talk to your accountant. Understand your current position under BADR. Model what alignment at 40%, 45%, or 50% would mean for your net proceeds. Then make a deliberate decision about timing rather than a reactive one when the announcement comes.
The difference between selling before and after alignment, on a typical UK SME sale, could be hundreds of thousands of pounds. That is not a marginal consideration. It is a retirement-changing number.
For buyers watching the window
If you are a buyer, the environment is shifting in your favour. Motivated sellers, tax-driven exit timing, and a growing pool of owners approaching retirement age all point toward more acquisition opportunities over the next 18 to 24 months.
The constraint is not deal availability. It is the ability to find the right businesses, identify the right owners, and start the conversation before they engage a broker or receive a competing offer. The buyers who build that pipeline now, before any announcement forces a rush, will have the strongest position when the window opens.
The honest uncertainty
It is important to be clear about what is known and what is not. The following are confirmed: the CGT main rate increased to 24% (effective 6 April 2026), the BADR rate is increasing to 18% (effective 6 April 2026), and the Investors' Relief lifetime limit was reduced from GBP10 million to GBP1 million.
The following are conjecture: full alignment of CGT with income tax rates, a 50% top rate of income tax under Burnham, the specific form any CGT reform would take, whether BADR would be retained, reformed, or abolished, and the timing of any announcement or implementation.
Burnham's speech on 29 June was deliberately silent on tax specifics. Grant Thornton notes that he is likely to "preserve as much flexibility as possible" and reserve decisions for a Budget. The direction of travel is discernible from his stated principles and from the policy positions of those around him, but the specifics are genuinely unknown.
What is not unknown is the direction. Capital gains tax is going up. BADR is narrowing. The gap between the tax treatment of selling a business and the tax treatment of earning a salary is closing. For anyone on either side of a business sale, the question is not whether the environment will change, but whether they act before it does.