Two siblings, or two business partners, built a property portfolio together inside one company over fifteen years. Now one wants to keep developing, the other wants to hold and let, and neither wants to keep making joint decisions about the other's half. The instinctive answer — sell the properties, split the cash — usually triggers exactly the tax bill everyone is trying to avoid. A demerger is the alternative: splitting the company itself, not the properties inside it, so each shareholder ends up owning their share outright without a sale ever happening.
Why a straight split doesn't work
The properties sit inside a single company, and the shareholders each own shares in that company — they don't own the properties directly. Simply transferring individual properties out to each shareholder personally is a disposal by the company for Corporation Tax purposes, valued at market value regardless of what (if anything) changes hands, and a distribution to the shareholder that can also carry an Income Tax charge on top. A liquidation of the whole company to release the properties has similar problems if done without care. Either route, done badly, produces tax on a value the family hasn't actually realised in cash — the classic complaint behind every demerger conversation.
A demerger avoids this by moving properties between companies that stay under corporate ownership throughout, restructuring who owns which company rather than transferring assets out to individuals directly. Done correctly, the shareholders end up as before — owning shares, not properties — just in two separate companies instead of joint shares in one.
Route one: the statutory demerger
A statutory demerger, sometimes called an exempt distribution demerger, lets a company transfer a trade or the shares in a subsidiary to shareholders without that distribution being taxed as income, provided a list of statutory conditions is met. In its most common form for a property-holding structure, the existing company (or a new holding company inserted above it) first transfers the properties destined for one shareholder into a new subsidiary, then distributes the shares in that subsidiary directly to that shareholder, who ceases to hold shares in the original company in return.
The statutory conditions are exacting: both companies generally need to be trading companies or members of a trading group immediately before and after the demerger, the demerger has to be for genuine commercial reasons (typically evidenced by the shareholders' diverging plans for their respective portfolios), and it must not form part of a scheme with a main purpose of avoiding tax or enabling a subsequent sale of either company outside the group. This is where a straightforward buy-to-let holding company can run into difficulty: a passive rental portfolio with no development or trading activity may struggle to meet the trading company test at all, which pushes many pure investment portfolios toward the liquidation route below instead.
Route two: the liquidation demerger
Where the trading condition can't be met — a common outcome for a portfolio that is pure buy-to-let investment rather than development — a liquidation demerger under section 110 of the Insolvency Act 1986 is the usual alternative. New companies are formed for each shareholder group, the original company is placed into a members' voluntary liquidation, and the liquidator transfers the properties to the new companies in specie in exchange for shares in those companies, which are then distributed to the relevant shareholders in satisfaction of their rights on the winding-up.
Handled correctly, the distribution is treated as capital rather than income in the shareholders' hands, meaning Capital Gains Tax applies rather than Income Tax — usually the more favourable outcome, and often sheltered in whole or part by Business Asset Disposal Relief where the individual conditions for that relief are separately met. This route doesn't require the trading company test the statutory demerger does, which is exactly why it's the more common structure for splitting a passive property investment portfolio between family members.
Where SDLT catches people out
Moving properties between companies ahead of either type of demerger is usually done using SDLT group relief, since the companies are under common ownership at the point of transfer and no SDLT is due on an intra-group move. The trap is that group relief is normally withdrawn, triggering an SDLT charge retrospectively, if the transferee company leaves the group within three years of the transfer — and a demerger, by its very nature, is designed to take the receiving company out of the group. Getting the sequencing, timing, and available exemptions from the withdrawal charge right is usually the single most consequential technical point in the whole transaction, and it is very easy to get wrong if the demerger is planned around the Corporation Tax and CGT questions without SDLT specialists in the room from the start.
Clearance: getting HMRC's agreement in advance
Because both demerger routes sit close to anti-avoidance territory — a shareholder ending up with cash or assets outside the company structure is exactly the pattern the Transactions in Securities rules exist to catch — advance clearance from HMRC is standard practice before proceeding. For a statutory demerger, clearance is sought under the specific statutory clearance provisions covering the exempt distribution conditions themselves, alongside separate clearance on Transactions in Securities. A liquidation demerger has no equivalent statutory clearance mechanism for the demerger itself, but clearance on the Transactions in Securities point, and confirmation of the SDLT group relief position, are still routinely obtained before the liquidator is appointed. Proceeding without clearance is not fatal, but it leaves the family exposed to HMRC reaching a different view well after the properties have already moved.
How this compares to other exit routes
A demerger is a different tool to the profit-extraction and structuring questions covered in our guides to extracting profit from a property company and family investment companies. Those are about how income and value move out of a company that continues to be owned jointly; a demerger is about ending the joint ownership itself, cleanly, while keeping the tax-efficient company wrapper each shareholder wants to keep using afterwards. It also sits apart from a director's loan account problem, which is often what a badly structured, ad hoc split creates when properties or cash move to a shareholder outside a proper demerger process. Where the original structuring question was ever whether to hold property personally or through a company at all, that groundwork is covered in our guide to when an SPV makes sense.
Common mistakes
- Assuming a simple transfer of specific properties to each shareholder is tax-neutral because "nothing was sold," when it can trigger both a company-level disposal and a shareholder-level distribution charge
- Attempting a statutory demerger on a passive buy-to-let portfolio that doesn't meet the trading company condition, rather than using the liquidation route designed for that situation
- Moving properties into new subsidiaries using SDLT group relief without planning for the three-year withdrawal rule the demerger itself is about to trigger
- Proceeding without seeking HMRC clearance, and finding out only later that the Transactions in Securities rules apply
- Leaving the demerger until the shareholders are in active dispute, when a commercial rationale is harder to evidence and the process itself takes longer to execute cleanly under pressure
What this means for co-owned property companies
Where two or more shareholders have genuinely diverging plans for a jointly held portfolio, a demerger is very often the only route that splits the company without forcing a taxable sale of the underlying properties. The right structure — statutory or liquidation — depends heavily on whether the portfolio has any trading activity, how the properties were originally acquired, and what SDLT relief history sits behind them. It's exactly the kind of structuring decision worth planning well before relations between shareholders make it urgent, and it's an area we work through regularly as part of our Property Advisory service.
Common questions
How do you split a property company between shareholders without selling the properties?
A demerger splits the properties held in one company between two or more new companies, each ending up owned by a different group of shareholders, without the properties being sold to a third party. The two routes used in practice are a statutory (direct or indirect) demerger, which qualifies as an exempt distribution with HMRC clearance, and a liquidation demerger under section 110 of the Insolvency Act 1986, which uses a liquidator to transfer the properties in specie in exchange for shares.
Does Stamp Duty Land Tax apply to a property company demerger?
It can. Group relief from SDLT is available on the initial transfer of properties into a new subsidiary while both companies remain under common ownership, but that relief is normally withdrawn if the companies leave the group within three years of the transfer, which a demerger by definition causes. Structuring the demerger correctly, and timing it against the group relief withdrawal rules, is usually the single biggest SDLT risk in the transaction.
Do you need HMRC clearance for a property company demerger?
For a statutory demerger, advance clearance under the relevant statutory clearance provisions is standard practice, covering the anti-avoidance rule that can otherwise deny exempt distribution treatment, Transactions in Securities, and, where relevant, the SDLT group relief anti-avoidance rule. A liquidation demerger does not have the same statutory clearance mechanism, but pre-transaction HMRC clearance on the anti-avoidance and Transactions in Securities points is still routinely sought.
Kieran Holsgrove is a Director and Co-Founder of Grafene Accounting, the property tax specialist firm based in Liverpool. He advises property developers, investors and landlords across Merseyside, Greater Manchester, Lancashire and Cheshire on tax structuring, developer VAT, SDLT and the long-view decisions that compound over the life of a portfolio.
This article is general information, not personal tax advice, and tax rules change. Your own position depends on facts we cannot see from here — please take advice before acting on anything above.