How is a share buyback taxed, and why does the treatment matter so much?

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by Abbas Gulamhusein

When a company buys back its own shares from a shareholder, the proceeds can be taxed in one of two completely different ways. On a large buyback the gap between them runs into hundreds of thousands of pounds. The transaction is identical either way; only the tax treatment changes. That is exactly why HMRC pays attention, and why you should too.

A recent tribunal decision, Boulting v HMRC, shows how the line gets drawn and what you need to do to end up on the right side of it.

The two ways it can be taxed

The default is that the money you receive is a distribution, taxed on you as a dividend. For a higher-rate taxpayer that is 35.75% in 2026/27.

The exception is capital treatment, where the buyback is taxed as a disposal of shares under the capital gains rules instead. The main rate there is 24%, and if you qualify for business asset disposal relief the first £1 million of gains is taxed at 18%, with that £1 million a lifetime limit.

Here is what the difference looks like in practice. Say the company buys back part of your holding for £4.8 million. Treat it as a dividend and the tax is roughly £1.7 million, leaving you about £3.1 million. Treat it as capital, with business asset disposal relief on the first £1 million and 24% on the rest, and the tax is roughly £1.1 million, leaving you around £3.7 million. That is about £620,000 of difference on a single transaction, for the same money changing hands.

What gets you the capital treatment

Capital treatment is not automatic, and you don't get to choose it. The key condition is that the buyback has to be wholly or mainly for the benefit of the company's trade. The emphasis matters: the company's trade, not the shareholder's benefit. The rule sits in section 1033 of the Corporation Tax Act 2010.

The textbook case is a management deadlock. Two shareholders who cannot agree, with the disagreement actively damaging the business, and the company buys one of them out to break the deadlock and move forward. That is a clear trade benefit. A founder retiring so the company can simplify its ownership and let an active management team run things works too. So does removing a shareholder whose disputes are dragging the business down. The common thread is that the company, not the seller, gets a real commercial benefit.

The Boulting case

This was tested in Boulting v HMRC, decided by the First-tier Tribunal in October 2025. John Boulting founded a training group and was still its majority shareholder some twenty years later. Tensions had built up at board level, mainly over investment in the business, between him and the younger directors, including his son, who was managing the company. His continued control was blocking the investment the business needed.

The agreed solution was for him to step back. The company bought some of his shares for £4.8 million, he gave most of his remaining shares to his son, and he kept a few back for his grandchildren. That combination removed him from control.

HMRC granted advance clearance up front, confirming the capital treatment was available. Then, years later, it changed its position. It said the clearance no longer bound it, because the price paid was higher than the market value of the shares and that had not been disclosed in the clearance application. It recharacterised the £4.8 million as an income distribution and added over £1 million to Mr Boulting's tax bill. The argument, in essence, was that overpaying pointed to the real purpose being to get money out to Mr Boulting rather than to benefit the trade.

What the tribunal decided

The tribunal sided with the taxpayer. The right question, it said, is why the shares were bought at all, not whether the price looked exactly right. The company's purpose was clear: remove a controlling shareholder who was blocking investment so the business could move forward. That is a trade benefit, and a profitable business can still benefit from removing someone who is holding it back.

The tribunal also rejected HMRC's argument that a partial buyback cannot qualify. HMRC's position was that if the company would not buy all the shares, the main purpose could not be trade benefit. The tribunal disagreed. The buyback did not have to achieve the whole objective on its own. Taken together with the gift of the remaining shares to the son, it did exactly what the company needed, which was to remove Mr Boulting from control. The high price fell away as an objection too. The tribunal read it as the board's determination to get him to sell, not as evidence that the deal was really about rewarding him for the past.

What this tells you to do

Three practical points come out of Boulting.

First, document the commercial reason at the time, not afterwards. Whether it is a dispute, a deadlock or a retirement, write down why the company is doing this while it is happening. Robust, contemporaneous board minutes were a large part of why Mr Boulting won. Documentation produced after HMRC starts asking questions carries far less weight.

Second, if you apply for clearance, tell HMRC the whole story. A clearance only protects you if it was given on full and accurate facts. HMRC attacked Mr Boulting's clearance precisely because it said a material fact, the price, had not been disclosed. A clearance obtained on incomplete information is worth very little.

Third, a partial buyback can work. You do not have to sell every share back to the company. Where the buyback is one step in a wider plan that benefits the trade, that can be enough.

Where it doesn't work

The treatment is not a free choice. If you are the sole shareholder and you simply want to pull cash out, and the company buys back some shares to let you do it, that is not a trade benefit. That is income, taxed as a dividend. The capital route exists for genuine commercial reasons, not for turning what is really a distribution into a lower-taxed gain.

Valuation matters too, though less than HMRC argued in Boulting. The company should pay a fair price within a sensible range. The tribunal accepted that valuation produces a range of reasonable answers and that a high price within that range was explained by the commercial pressure to get the deal done. What you cannot do is deliberately overpay and expect the treatment to survive.

The numbers on a buyback are large enough that the tax treatment is never an afterthought. Boulting is a useful reminder that the outcome turns on the company's genuine commercial purpose, and on whether that purpose was properly documented at the time. A clearance helps, but it is the substance and the paperwork behind it that win if HMRC pushes back.

If you are thinking about a buyback and want to get the treatment right from the start, get in touch with us at Saymur.