Property and Divorce: The CGT and SDLT Rules on Transfers Between Separating Spouses

Separating couples usually have a buy-to-let portfolio, a family home, or both to sort out, and the tax rules on moving those assets between them are more generous than most people assume, but only if the transfer happens in the right way and within the right window. Get the timing wrong and a routine transfer between spouses can trigger a Capital Gains Tax bill neither party expected.

Why spouses get special treatment in the first place

Ordinarily, transferring a property to anyone else, even at no cost, is treated for CGT purposes as if you had sold it at market value. Between spouses and civil partners living together, that rule is switched off: transfers happen on a "no gain, no loss" basis, meaning the receiving spouse simply inherits the other's original base cost and acquisition date, and no CGT is due at the point of transfer. The gain is not cancelled — it is deferred until the recipient eventually sells.

The complication is that this treatment has always depended on the couple living together as spouses. Historically, that meant the protection ended abruptly at the close of the tax year of separation — so a couple who separated in March had only a few weeks to sort out property before losing it, while a couple who separated in April effectively had a full year. It was an arbitrary cliff-edge that regularly produced unfair, avoidable tax bills.

The current rule: up to three tax years to transfer CGT-free

Since 6 April 2023, separating spouses and civil partners have up to three years after the end of the tax year in which they stopped living together to make no gain, no loss transfers between them. In practice, that gives most separating couples well over a year, and often closer to four years, to divide property without a CGT charge on the transfer itself — considerably longer than the old rule, and enough time to work through a financial settlement without the tax position forcing a rushed decision.

This window applies to transfers made outside a formal court order or agreement — for example, sorting out ownership informally before the legal process concludes. Once the three years have passed, transfers revert to being treated as disposals at market value, with CGT calculated in the normal way.

No time limit at all for assets transferred under a formal agreement

Where a property is transferred as part of a formal divorce or dissolution settlement — whether that is a court order or a written agreement made in connection with the divorce — the no gain, no loss treatment applies with no time limit whatsoever. This is the more important relief for most separating couples in practice, because financial settlements frequently take well over three years to finalise, particularly where they are contested or tied up with other litigation.

The practical effect is that couples are not penalised for taking the time needed to reach a fair settlement, provided the eventual transfer is documented as part of that formal process. Informal transfers made years after separation, without that paperwork, do not get the same protection.

The family home: keeping Private Residence Relief alive after you move out

Private Residence Relief normally exempts your only or main home from CGT entirely. The problem for separating couples is that one spouse typically moves out well before the financial settlement is finalised — and from that point, the property stops being their main residence, with only a final period of relief (nine months, under current rules) still available once they eventually dispose of their interest.

Since April 2023, a specific election addresses this. Where the spouse who moved out later transfers their share of the family home to the spouse who stayed, as part of the separation, they can elect for the property to continue to be treated as their main residence right up to the date of transfer — provided it has remained the other spouse's main residence throughout. Get this election in at the right time and the moving-out spouse can avoid a CGT charge on their share entirely, rather than losing relief for the period between moving out and the eventual transfer.

A related rule covers deferred sale arrangements, common where the family home is not transferred outright but sold later with the departing spouse entitled to a share of the proceeds (a "Mesher" or similar order). Where that applies, the same tax treatment that would have applied to a transfer at the time of the order can instead be applied to the spouse's share of the eventual sale proceeds — avoiding a mismatch between when the entitlement arose and when the tax point falls.

SDLT: transfers on divorce are exempt, even with a mortgage attached

Stamp Duty Land Tax is a separate tax with its own rule, and it is a generous one. Transfers of property between spouses or civil partners made in connection with divorce, dissolution or judicial separation — whether under a court order, a court-approved agreement, or a written separation agreement — are exempt from SDLT entirely.

This exemption is unusually wide because it applies even where the receiving spouse takes on responsibility for an existing mortgage. In a normal transfer between unrelated parties, assuming a mortgage counts as chargeable consideration and can trigger an SDLT bill; on divorce, it does not. This is one of the few areas where the tax system is genuinely simple for separating couples, provided the transfer is properly documented as connected to the separation.

Inheritance Tax: the spouse exemption stops at decree absolute

It is worth flagging the one relief that does not extend through separation: the unlimited Inheritance Tax spouse exemption applies only while a couple remains legally married or in a civil partnership. Once a divorce or dissolution is finalised, any future transfers between the former spouses lose that exemption and are treated as gifts between individuals, which is relevant for anyone structuring a settlement that involves ongoing transfers, deferred payments, or a share retained in a jointly owned company.

Where this goes wrong in practice

The most common costly mistakes are timing-related rather than about the underlying rules:

• Transferring after the window has closed without a formal agreement in place — leaving a transfer that should have been tax-free treated as a market value disposal.
• Missing the Private Residence Relief election on the family home, so the moving-out spouse loses relief for years they were entitled to keep it.
• Assuming a company-held portfolio follows the same rules — shares in a jointly owned property company are a different asset from the underlying property, and the same reliefs need to be checked against the actual structure, not assumed to apply.
• Overlooking SDLT on transactions that go beyond the exempt transfer — for example, where one spouse buys out the other's equity for cash rather than the property simply changing hands as part of the settlement, which can bring ordinary SDLT rules back into play.

Where a portfolio sits inside a limited company rather than personal names, the position is different again — see our guide on extracting profit from a property company for how share ownership and director's loan positions interact with a settlement.

Common questions

How long do separating spouses have to transfer property without triggering CGT?

Since 6 April 2023, separating spouses and civil partners have up to three years after the end of the tax year in which they stopped living together to transfer assets between them on a no gain, no loss basis. Before that date, the window was only the remainder of the tax year of separation, which caught out anyone who separated close to 5 April.

Is there a time limit if the transfer is part of a formal divorce settlement?

No. Where an asset is transferred as part of a formal divorce or dissolution agreement, or under a court order, the no gain, no loss treatment applies with no time limit at all, even years after separation. The three-year window only matters for transfers made outside a formal agreement.

Do you pay Stamp Duty Land Tax when transferring property on divorce?

Transfers of property between spouses or civil partners made in connection with divorce, dissolution or judicial separation, including under a court order or a written separation agreement, are exempt from SDLT. This applies even where the receiving spouse takes on a mortgage, which would normally count as chargeable consideration.

What happens to Private Residence Relief when one spouse moves out of the family home?

Ordinarily, a home stops being your main residence for CGT purposes once you move out, other than a final period of relief. But where a spouse who has moved out later transfers their share of the family home to the one who stayed, they can elect for the property to continue to be treated as their main residence up to the point of transfer, provided it has remained the other spouse's main residence throughout.

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.

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