Transfer of Equity and Stamp Duty: When SDLT Is Due in 2026
Adding a partner to the deeds, taking an ex-partner off them, or gifting a slice of a home to a grown-up child rarely feels like buying anything. Yet each of these — a transfer of equity — can trigger a Stamp Duty Land Tax (SDLT) bill in England. The trap almost always comes from the same place: an outstanding mortgage.
SDLT is charged not on what the home is worth, but on the chargeable consideration — what the person acquiring the share actually gives for it. And under UK tax law, taking on a share of someone else's mortgage counts as giving something.
Of the 699,846 full-market residential sales recorded across England during 2025, just 7.2% completed at or below the £125,000 standard SDLT nil-rate band, and only 0.1% at or below £40,000 (HM Land Registry Price Paid Data, fetched 8 July 2026). A transfer of equity is charged on a share of a home — often a fraction of its value — so the consideration frequently lands inside that nil-rate band. That is why many transfers cost nothing. It is also why the ones that do generate a bill catch people off guard.
What a transfer of equity is
A transfer of equity changes who owns a share of a property while at least one existing owner stays on the title. The common cases are:
- adding a spouse or partner to the deeds;
- removing a departing partner after a separation;
- gifting a share to an adult child or another family member;
- reallocating shares between co-owners — for example siblings who inherited a home together.
Whether it is done by a formal transfer deed or by a declaration of trust that moves the beneficial ownership, the tax question is the same: did the person taking on the share give any chargeable consideration for it? A beneficial interest in land is a chargeable interest for SDLT purposes (Finance Act 2003, sections 43 and 48), so acquiring one is a land transaction that has to be tested — even where the legal title at the Land Registry does not change.
The rule that catches people: debt counts as consideration
The single most misunderstood point is that an assumed mortgage is consideration. Under Finance Act 2003, Schedule 4, paragraph 8, where the person acquiring a share takes on a portion of the outstanding mortgage debt, that share of the debt is treated as chargeable consideration — even if no cash changes hands. HMRC's own guidance on transferring ownership of land or property sets out the same principle.
So the amount that matters is not the property price and not the cash paid — it is the cash plus the share of the mortgage taken on. That figure is then run through the ordinary SDLT thresholds:
| Chargeable consideration | SDLT return | Standard SDLT due |
|---|---|---|
| Under £40,000 | Generally none required | £0 |
| £40,000 – £125,000 | Usually required | £0 |
| £150,000 | Required | £500 |
| £200,000 | Required | £1,500 |
| £250,000 | Required | £2,500 |
England rates, verified against the Homecost stamp duty calculator, 8 July 2026.
The £40,000 floor is important in its own right: below it, there is generally no need to file a return at all. At or above £40,000, a return is usually required even when the tax works out at zero.
No money, no mortgage: the exempt gift
Where nothing at all is given, there is no SDLT. Finance Act 2003, Schedule 3, paragraph 1 exempts a transaction with no chargeable consideration. A pure gift of a share in a mortgage-free home — no cash, no debt taken on — is outside SDLT entirely.
The exemption falls away the moment a mortgage is involved. If the home is mortgaged and the incoming owner joins the loan, HMRC treats their share of the outstanding balance as consideration, and the thresholds above apply.
Three worked examples
| Scenario | Chargeable consideration | Standard SDLT | If the recipient already owns another home (5% surcharge) |
|---|---|---|---|
| One partner takes over the other's half of a £200,000 mortgage | £100,000 | £0 | £5,000 |
| One partner takes over the other's half of a £250,000 mortgage | £125,000 | £0 | £6,250 |
| A sibling pays £150,000 in cash for the other's half-share | £150,000 | £500 | £8,000 |
| A share bought for £200,000 (cash or assumed debt) | £200,000 | £1,500 | £11,500 |
Calculated on England rates, 8 July 2026.
Spouse buyout. A couple own a home 50/50 with a £200,000 mortgage outstanding. One takes 100% and assumes the other's half of the loan. The debt taken on is £100,000, which sits below the £125,000 nil-rate band, so no SDLT is due at standard rates. Transfers made under a court order in connection with divorce or dissolution are separately exempt (Finance Act 2003, Schedule 3), and there are specific rules for transfers on separation and divorce that a conveyancer confirms on the facts.
Parent-to-child gift. A parent gifts a 50% share of a mortgage-free home to an adult child. No cash passes and no debt is assumed, so the consideration is nil and the transfer is exempt. If instead the home carried a £200,000 mortgage and the child joined it, the child's £100,000 share of the debt would be consideration — £0 at standard rates, but £5,000 if the child already owns another dwelling and the higher rates apply.
Sibling reallocation after inheritance. Two siblings inherit a £300,000 home 50/50, mortgage-free. One buys out the other for £150,000 in cash. The consideration is £150,000, so £500 of SDLT is due. If the buying sibling already owns a home, the additional-property stamp duty surcharge can push the bill to £8,000.
Where surcharges and reliefs bite
Two layers sit on top of the standard calculation. The 5% higher rate for additional dwellings applies to the whole chargeable consideration where the recipient ends up owning more than one dwelling — a flat 5% that turns a £100,000 share from £0 into £5,000. Transfers between spouses or civil partners who are living together can fall outside the higher rates, but the detail depends on the exact circumstances.
First-time buyer relief can also be in play where someone is acquiring their first interest in a home through a transfer of equity, though the relief has its own eligibility tests — set out in the guide to first-time buyer relief. Because a transfer of equity is an acquisition of a beneficial interest, the way ownership is held matters; the mechanics overlap with how bare trusts and nominee arrangements are treated.
The company exception
One situation is charged differently. Where the share is transferred to a company connected with the person giving it up — for example moving a beneficial interest into a family company — SDLT is charged on not less than the market value of the interest, regardless of the actual consideration (Finance Act 2003, section 53). A "gift" of a half-share into a controlled company is therefore taxed as if full value had been paid for it.
Put your own numbers in
The figures above turn entirely on the chargeable consideration, so the fastest way to see a position is to run the exact number through the Homecost stamp duty calculator, which applies the England, Scotland and Wales regimes and the higher rates. To see how a transfer sits against the full running cost of a property, check the monthly cost of a home in Manchester (M1 1AE) or browse other Cost Intelligence guides.
A transfer of equity is one of the areas where SDLT surprises people most, precisely because no obvious "purchase" takes place. This is general information, not advice. Speak to a qualified adviser before acting.