There is a moment in almost every business sale where the deal quietly forks into two very different transactions. One is a share sale: the buyer purchases your company, whole and intact, and steps into your shoes as owner. The other is an asset sale: the buyer purchases the trade and the specific assets they want, and leaves the company shell — and much of its history — behind with you. Same business, same price on the headline, but a materially different outcome once tax, risk and legal exposure are settled.
Which structure you end up with is rarely a neutral accounting choice. It is a negotiation, because a seller and a buyer almost always want opposite things. This guide explains the difference between a share sale and an asset sale for a UK private company, why the two sides pull in different directions, and where the money and the risk actually sit. It is written for owners of UK businesses approaching a trade sale, and it is deliberately UK tax-heavy — every tax point is flagged "In the UK…", because the mechanics do not travel. In the United States the same fork exists as a stock deal versus an asset deal, but the reliefs and elections are entirely different, so treat any US comparison as a one-line aside, not a transferable rule.
Start with what is actually changing hands, because everything else follows from it.
In a share sale, you sell the shares in the company. The buyer acquires the legal entity as it stands — its assets, its contracts, its employees, its trading history, its bank accounts and, crucially, its liabilities, known and unknown. The company continues; only its ownership changes. Your customer contracts, supplier agreements, leases and licences generally transfer automatically because the counterparty is still the same company. From your side, you have made a clean break: you have sold the whole company and, in most cases, walked away from what happens inside it afterward.
In an asset sale (sometimes called a business and asset sale, or a trade and asset sale), the company itself is not sold. Instead the company sells specific assets and the trade to the buyer — the plant, the stock, the goodwill, the brand, the customer relationships, the intellectual property, whatever is listed in the agreement. The buyer cherry-picks. Anything not named in the sale and purchase agreement stays where it is. Employees transfer under TUPE, and many contracts have to be individually novated or assigned rather than carried across automatically. After completion you are left holding the original company — now cash-rich from the sale proceeds but stripped of its trade — which you then have to extract value from and, usually, wind up.
A share sale transfers the company; an asset sale transfers selected assets and the trade. That single distinction drives everything that follows — your tax bill, your ongoing risk, and how cleanly the deal completes. Settle the structure early, because it is far harder to unpick once heads of terms are signed.
The reason this is a negotiation and not a formality is that the structure that is best for you is usually the structure that is worst for the buyer, and the reverse. Understanding the other side's incentives is how you defend your preference — or trade it for something you value more.
For most owners, a share sale is the better deal, and the tax is the largest reason. In the UK, selling shares in a trading company is a single capital gains tax event on you personally, and it may qualify for Business Asset Disposal Relief — the relief that reduces the CGT rate to 10% on the first £1 million of qualifying lifetime gains. There is no tax charge inside the company first; the whole company leaves your hands in one transaction, and the proceeds land in your bank account already taxed at a favourable rate.
Beyond tax, a share sale gives you a cleaner exit. You sell the entire company, liabilities included, so you are not left administering a stripped-out shell or unwinding contracts one by one. And because the company continues unchanged, your customer, supplier and employment arrangements typically carry on without the friction of re-papering every relationship. For an owner who wants to be genuinely out at completion, the share sale delivers it.
A buyer's instincts run the other way. Buying shares means buying the whole company, including every liability it has ever incurred — the tax dispute you have not heard about yet, the historic employment claim, the environmental exposure, the contract with a clause nobody remembers signing. A buyer taking shares inherits all of it. An asset sale lets them leave that risk with you: they take the assets and the trade they want, and the company's history stays behind in the shell.
There is a tax dimension for the buyer too. In the UK, when a buyer acquires assets rather than shares, they can often claim capital allowances on qualifying plant and machinery at the price they actually paid, and they get a clean cost base for the intangibles they acquire — goodwill, brand, customer relationships — which can be advantageous depending on the asset mix and the acquiring structure. A share purchase, by contrast, inherits the company's existing (often lower) tax base. So the asset route can be both lower-risk and more tax-efficient for the buyer — which is precisely why they push for it, and why you should expect to be paid for giving it up.
The preference is a tendency, not a law. Buyers frequently accept a share sale — to keep contracts and licences intact, to complete faster, or because you have priced the risk out with strong warranties and a clean data room. The point of understanding the tension is not to win it outright but to know what you are conceding, and to be paid for it in the price.
For a UK seller, the structure decision is, above all, a tax decision. The two routes are taxed on completely different mechanics, and the gap between them can run to a significant share of your net proceeds.
| Question | Share sale | Asset sale |
|---|---|---|
| Who is taxed? | You, personally, on the gain on your shares | The company first, on the gain on the assets; then you again when you extract the cash |
| How many tax layers? | One — a single CGT event | Two — corporation tax in the company, then CGT or income tax on extraction |
| Is BADR available? | Yes, if the qualifying conditions are met | Not on the company-level gain; may apply on winding up, subject to conditions |
| Headline seller rate | As low as 10% on the first £1M with BADR | Company gain taxed at the corporation tax rate, then a second charge on you |
| Stamp taxes | Buyer pays 0.5% stamp duty on the shares | Buyer pays SDLT on any UK land/property; assets otherwise generally outside stamp duty |
| VAT | Outside the scope of VAT (sale of shares) | Often a transfer of a going concern (TOGC), so no VAT — but conditions must be met |
The single most important line in that table is the number of tax layers. This is the tax trap that catches owners who let the buyer steer them into an asset sale without modelling the net position.
In the UK, an asset sale can be taxed twice. First the company pays corporation tax on the gain it makes selling the assets. Then, when you take that cash out of the company — as a dividend, or on a subsequent winding-up — you are taxed again, personally. A headline price that looks identical to a share sale offer can leave you with materially less in hand once both layers are paid. Never compare a share offer and an asset offer on the gross number; compare them net of tax, modelled properly, before you agree the structure.
Business Asset Disposal Relief — formerly Entrepreneurs' Relief — is the reason the share route is so often the seller's clear preference. In the UK, where the conditions are met, it reduces the CGT rate to 10% on the first £1 million of qualifying gains over your lifetime. To qualify on a share sale you generally need to have held at least 5% of the ordinary shares and voting rights, the company must be a trading company (not an investment company), and you must have been an officer or employee — each for the qualifying period before disposal.
Those conditions matter because they are checkable well in advance and, in some cases, fixable. An owner who discovers eighteen months out that their shareholding, their trading status or their officer position does not qualify has time to restructure; an owner who discovers it in the week of completion does not. This is one of several reasons the tax structure of a sale is decided long before the sale itself.
Rates, thresholds and qualifying conditions for Business Asset Disposal Relief change with successive Budgets, and the lifetime limit has moved before. This guide explains the mechanism, not a promise of a specific rate on a specific day. Confirm the current position with a tax adviser before you rely on any number here.
Two further UK tax points are worth knowing, even though they usually fall on the buyer rather than on you.
On a share sale, in the UK the buyer pays stamp duty on shares at 0.5% of the consideration. It is the buyer's cost, but it enters the negotiation because it is one of the few tax items that is cheaper on the share route — there is no SDLT on the trade, and the sale of shares sits outside VAT.
On an asset sale, in the UK stamp duty land tax (SDLT) applies to any land or property transferred as part of the assets, at the ordinary commercial rates, which can be a meaningful sum where premises are involved. Most other assets fall outside stamp duty. VAT is usually avoided because a going-concern sale can qualify as a transfer of a going concern (TOGC), but only if the conditions are met — get the TOGC treatment wrong and VAT can be charged on the whole asset price, an unwelcome surprise for the buyer that tends to become your problem in the negotiation.
Tax is the first half of the structure decision. Risk is the second, and it points the opposite way: the share sale that is better for your tax is usually worse for your legal exposure.
Because a share buyer inherits the whole company — including liabilities they cannot see — they protect themselves by extracting extensive warranties and indemnities from you in the sale and purchase agreement. Warranties are your contractual statements that the business is as described: the accounts are accurate, the tax is paid, the contracts are valid, there is no undisclosed litigation. If a warranty turns out to be untrue and the buyer suffers a loss, they can claim against you. Indemnities are pound-for-pound promises to cover specific identified risks. On a share sale these can be substantial, and they keep you on the hook for a period after you thought you had exited.
Your defence against warranty exposure is the disclosure letter. Anything you fairly disclose in it cannot later be claimed as a warranty breach — the buyer knew, so they cannot say they were misled. A thorough disclosure letter, backed by a well-organised data room, is how a seller narrows warranty risk to what is genuinely unknown rather than everything the buyer's lawyers can imagine.
On an asset sale, warranty exposure is generally narrower, because the buyer is not inheriting the company's history — they left it behind in the shell. They still want warranties on the assets and the trade they are buying, but the sprawling "everything the company has ever done" schedule of a share deal is largely absent. This is the trade-off in plain terms: the share sale wins you the tax and costs you the risk; the asset sale reduces your ongoing risk but can cost you the double tax charge.
An owner was offered £6m for their company on either basis. On a share sale, BADR and a single CGT event left them with a net figure they could plan around, in exchange for a two-year warranty period. On an asset sale at the same headline £6m, corporation tax inside the company and a second charge on extraction reduced the net proceeds materially — the "lower risk" route was, once modelled net of tax, the more expensive one. They took the share sale, negotiated a capped warranty period, and used a comprehensive disclosure letter to keep the residual exposure tight.
Whichever structure the deal takes, the buyer is paying for the same underlying thing: the future earnings of the business, and the intangible assets that produce them. In a modern private company, most of the value a buyer is acquiring is intangible — brand, customer relationships, technology, know-how, contracts — and almost none of it sits on your balance sheet, because UK accounting standards do not capitalise internally generated intangibles. The structure decides the wrapper; it does not change what is actually being bought.
At Opagio we organise these assets through The Opagio 12 — twelve categories of intangible value driver that determine how much a buyer will pay. The structure interacts with them in a way sellers should anticipate:
The buyer will also, on either route, spread the price they pay across the individual assets they acquire. On an asset sale this allocation is explicit in the agreement and directly affects both sides' tax. On a share sale it happens after completion, when the acquiring group books the deal under the rules for business combinations. Either way, the seller who has already identified and evidenced their intangibles negotiates from a stronger position, because the value is itemised and provable rather than left as an undifferentiated lump the buyer defines on their own terms. For how buyers split the price across assets, see our guide on how buyers allocate the purchase price.
The structure you negotiate is stronger when the value underneath it is documented. Opagio Intangibles identifies and classifies your intangible assets across Opagio 12, values them with recognised methods, and produces the Opagio Value Drivers Register™ and a Normalised P&L — the evidence a buyer's diligence will test, whichever way the deal is structured. See how Opagio Intangibles builds the evidence, or view pricing.
Neither structure is usually settled with a single cash payment on the day. Buyers commonly hold back part of the price as deferred consideration or tie it to future performance through an earn-out, and the completion mechanism — completion accounts or a locked-box mechanism — decides how the final price is trued up for the working capital and cash in the business at the point of sale. These mechanics sit on top of either structure, and they interact with the tax: deferred and contingent consideration have their own UK CGT timing rules, and the interaction with BADR is not always intuitive. The structure choice and the payment structure need to be modelled together, not in sequence.
The honest summary is that there is no universally right answer — but for most UK owners of a trading company, the share sale is the preferred starting position, because one CGT event and the availability of BADR usually outweigh the heavier warranty exposure it carries. The asset sale becomes attractive to a buyer worried about hidden liabilities or seeking a clean tax base, and you may accept it — but only after modelling the double-tax exposure and pricing the difference into the deal.
Two rules hold whichever way you go. First, settle the structure at heads of terms, not in the final drafting, because it is expensive to reverse once the momentum of the deal is running. Second, compare offers net of tax, never on the headline — an asset offer and a share offer at the same gross price are not the same deal in your hand.
If you are working toward a sale, start with the full sell-your-business hub for the wider journey, and walk through the business sale process step by step to see where the structure decision fits in the timeline. For the plain-English difference, see share sale vs asset sale — what is the difference, and for the relief that so often tips the balance, what is Business Asset Disposal Relief. When you are ready to evidence the intangible value a buyer will price on either route, see Opagio Intangibles or view pricing.
Ivan Gowan is Founder and CEO of Opagio. He spent twenty-five years in fintech, including at IG Group, before building Opagio to help owners see and evidence the intangible value in their businesses. Meet the team.
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