Separate what you want to keep, without putting the sale at risk.

Sometimes, but it is one of the riskiest times to do it. Several reliefs that make a demerger tax neutral have conditions or anti-avoidance rules that look at what happens next, including a sale or a change of control. A demerger shortly before a sale isn't automatically ruled out, but the route, the order of the steps and the disclosure to HMRC all need care. Start as early as you can.

The statutory demerger rules in CTA 2010 require that the distribution isn't part of arrangements with a main purpose of, among other things, a third party acquiring control of the distributing company or a demerged company, or the sale of a trade after the distribution. HMRC's guidance says the provisions don't apply where the trading activity is to be sold. So a statutory demerger is rarely the right route if a buyer is already in view.

Often it is more flexible, because it doesn't rely on the statutory demerger conditions. But it still relies on capital gains reliefs for reconstructions, which have their own anti-avoidance rule, and on stamp duty and SDLT reliefs that can be denied or clawed back if control changes. It can work well before a sale, but only where each relief is checked against the sale plans.

Sections 137 and 139 TCGA 1992 contain a rule that can counteract the reliefs where a main purpose of the arrangements is to reduce or avoid tax. Finance Act 2026 replaced the older bona fide commercial reasons test with this main purpose test for transactions from 26 November 2025. HMRC says deferral alone, in line with the purpose of the reliefs, is not treated as a tax advantage.

They can. The transactions in securities rules in Part 13 Chapter 1 of ITA 2007 can tax a receipt as income where a main purpose of a transaction is to obtain an income tax advantage. A demerger followed by a sale can be looked at as a whole, particularly if shareholders end up with cash representing company reserves. A clearance under section 701 ITA 2007 is usually included in the application.

If a company receives an asset from another group company at no gain and no loss, then leaves the group within six years while still owning it, section 179 TCGA 1992 can treat it as having sold and reacquired the asset at market value. Demergers and sales both move companies out of groups, so this needs checking. Where a statutory demerger causes the exit, a specific exemption can apply.

Often, yes. Where a company leaves a group because a group company sells its shares, the degrouping gain is usually added to the sale proceeds of those shares instead of being charged on the departing company. If the sale qualifies for the Substantial Shareholding Exemption, that gain can then be exempt too. The SSE conditions, including the 12-month holding and trading tests, still have to be met.

When the seller is a company rather than individuals. If a holding company sells a trading subsidiary, SSE can exempt the gain where the seller has held at least 10% for a continuous 12 months in the six years before the sale and the company sold is a trading company or holding company of a trading group. A demerger is sometimes used to put the right company in position to sell.

Yes. If property moved under SDLT group relief and the company holding it leaves the group within three years, or under arrangements made in that period, the relief can be withdrawn. Reconstruction and acquisition reliefs can be withdrawn if control of the acquiring company changes within three years. A sale of the property company, or the company that holds the premises, needs to be checked against these periods.

It can. Share-for-share relief under section 77 of the Finance Act 1986 isn't available where there are disqualifying arrangements, broadly arrangements with a purpose of particular persons obtaining control of the acquiring company. There is an exclusion for people who have held at least 25% of the target throughout the relevant period. The reconstruction relief in section 75 also needs bona fide commercial reasons. Stamp duty on shares is 0.5%.

Possibly, but check it before the demerger. BADR on a share sale needs the company to be your personal company and a trading company, or holding company of a trading group, with you an officer or employee, throughout the two years before the sale. Your new shares are generally treated as the same asset as your old ones, but where the company being sold is newly formed, the two-year conditions need careful review.

Ideally well before. Once heads of terms are signed, it's harder to show that arrangements for a sale don't exist, and several reliefs look at exactly that. Separating property a year or more ahead also gives a cleaner company for the buyer's due diligence. If an offer has already arrived, it isn't necessarily too late, but the route and the clearance application need to reflect the full facts.

Yes, if a sale is planned or being discussed. A clearance only protects you if all material facts were disclosed, and a planned sale is clearly material to a demerger. Leaving it out can make the clearance worthless. In practice, a well-explained application that sets out the commercial reasons for both the demerger and the sale gives HMRC what it needs to reach a decision.

Usually, yes. A buyer's advisers will want comfort that the demerger didn't leave tax exposures in the company they're buying, such as a degrouping charge or SDLT clawback. HMRC clearances, a clear step plan and evidence that the steps followed it make due diligence quicker. Buyers often ask for specific tax indemnities for pre-sale reorganisations, so good records help in negotiations too.

Sometimes. A new holding company can allow a trading subsidiary to be sold while property or cash stays in the group, which may mean nothing needs to be demerged. The holding company's sale can then rely on the Substantial Shareholding Exemption where the conditions are met. Whether that suits depends on what you want to do with the proceeds and the retained assets.

As early as possible, ideally before any buyer is involved. Early planning widens the choice of routes, makes it easier to evidence the commercial reasons and gives time for HMRC clearance, which has a 30-day response period from a complete application. It also lets the two-year BADR conditions and any SDLT clawback periods run their course before completion.