Do first-time buyers lose SDLT relief when added to a parent’s home through a transfer of equity?

Introduction

This is a common question where adult children are added to a parent’s home as part of a divorce settlement, refinance, or family restructuring. People often want to know whether they will still count as first-time buyers, whether Stamp Duty Land Tax (SDLT) is payable, and whether taking on part of an existing mortgage changes the tax result.

The short answer is that being added to the legal title of a dwelling is usually a land transaction for SDLT purposes. If money is paid and mortgage debt is assumed, that can create chargeable consideration. In addition, first-time buyer relief is strict: if all purchasers are not first-time buyers, the relief is not available.

The Question

Two adult children, both of whom have never previously owned a property, are considering being added to their mother’s home as part of arrangements following their parents’ separation. The father is to be bought out for a lump sum of £200,000. There is an existing mortgage of £95,000, but the mother is already a borrower and is expected to remain on the title and on the remortgage.

The main questions are:

• Does joining the title and mortgage mean the children stop being first-time buyers?
• Can first-time buyer SDLT relief still apply if their mother remains an owner?
• Is SDLT calculated on the £200,000 payment alone, or also on the mortgage debt taken on?
• If the mother remains responsible for part of the mortgage, does that reduce the chargeable consideration?

Nick’s Explanation

Nick’s view was that the transaction would amount to a chargeable land transaction because the children would be acquiring an interest in the property through a transfer of equity and remortgage.

In anonymised form, his reasoning was:

“When the children are added to the property title, that is a chargeable transaction for SDLT purposes. The chargeable consideration includes both the cash paid and any mortgage debt they assume.”

He initially noted that if the whole £95,000 mortgage were treated as debt assumed by the children, the total consideration would be £295,000. However, once it was clarified that the mother would remain liable for half of the mortgage, Nick revised the analysis.

“Since the mother remains as co-owner and retains responsibility for half of the existing mortgage, only the part of the mortgage debt being taken over by the children counts towards their chargeable consideration.”

On those facts, the revised consideration was:

• £200,000 cash paid to the father, plus
• £47,500 mortgage debt assumed by the children

That gave total chargeable consideration of £247,500.

Nick also explained that first-time buyer relief would not apply because the mother would remain an owner, and the relief only applies where all purchasers are first-time buyers.

The Law

SDLT is charged under section 42 of the Finance Act 2003 on land transactions. A “land transaction” is defined by section 43 and includes the acquisition of a chargeable interest in land. A transfer of equity can therefore fall within the SDLT rules.

Under section 50 of the Finance Act 2003, SDLT is charged by reference to the chargeable consideration for the transaction. Schedule 4 Finance Act 2003 explains what counts as chargeable consideration. That includes:

• money paid for the acquisition, and
• debt assumed or taken subject to, including mortgage debt

First-time buyer relief is contained in Schedule 6ZA Finance Act 2003. Broadly, the relief is only available if:

• each purchaser is a first-time buyer, and
• the dwelling is intended to be the purchaser’s only or main residence

If even one purchaser is not a first-time buyer, the relief is not available for the transaction.

Where a buyer acquires a major interest in a dwelling, that buyer will generally no longer be a first-time buyer for later purchases. A later purchase of another dwelling may also bring the higher rates for additional dwellings into point, depending on the facts at that later time.

Analysis

Step 1: Is there a land transaction?

Yes. If adult children are added to the title of a residential property, they are acquiring a chargeable interest in land. That is enough to bring the transaction within the SDLT regime.

Step 2: Is there chargeable consideration?

Yes. The consideration is not limited to the cash paid to the outgoing owner. It also includes mortgage debt that the incoming owners take on.

Step 3: What amount of mortgage debt counts?

This depends on who actually assumes liability for the debt. If the mother remains on the mortgage and remains responsible for half of it, that retained share does not form part of the children’s assumed debt. On the stated facts, only £47,500 of the existing mortgage would be treated as assumed by the children.

That produces total chargeable consideration of:

• £200,000 cash payment
• £47,500 mortgage debt assumed
• Total: £247,500

Step 4: How much SDLT is payable?

Using the standard residential rates stated in Nick’s explanation:

• £125,000 at 0% = £0
• £122,500 at 2% = £2,450

Total SDLT: £2,450.

Step 5: Does first-time buyer relief apply?

No. Even though the two children have never owned property before, their mother remains a purchaser and she is not a first-time buyer. Schedule 6ZA requires all purchasers to be first-time buyers. That condition is not met.

Step 6: When do they stop being first-time buyers?

Once they acquire a legal interest in the dwelling, they will generally no longer qualify as first-time buyers for future purchases. It is the acquisition of the dwelling interest that matters, not simply whether the borrowing is called an inherited mortgage or a new remortgage.

Step 7: What about future purchases?

If they later buy another dwelling while still owning an interest in this one, the higher rates for additional dwellings may need to be considered. The exact result will depend on the facts and timing of the later transaction.

Outcome

On the facts described, the practical conclusion is:

• The transfer of equity is a chargeable transaction for SDLT purposes.
• The chargeable consideration is likely to be £247,500 if the mother remains liable for £47,500 of the mortgage and the children assume only the other £47,500.
• The SDLT is approximately £2,450 at the standard residential rates used in the explanation.
• First-time buyer relief does not apply because all purchasers are not first-time buyers.
• Once the children acquire their interest, they will no longer be first-time buyers for future purchases.

Practical Steps

If you are in a similar situation, the key points to check are:

• Who is currently on the legal title?
• Who is coming off the title and who is being added?
• Exactly how much cash is being paid, and to whom?
• Who is currently liable for the mortgage?
• After the remortgage, who will remain liable for the debt?
• What beneficial shares will each owner hold after completion?

You should ask your conveyancer to confirm the SDLT analysis by reference to:

• the transfer deed
• the mortgage offer and lender requirements
• the declaration of trust or other beneficial ownership document
• the exact amount of mortgage debt being assumed by each incoming owner

If there is any uncertainty, it is sensible to obtain clear SDLT advice before submission of the SDLT return, because the tax is self-assessed and the legal documentation must match the tax analysis.

Conclusion

If first-time buyers are added to a parent’s home together with an existing owner who is not a first-time buyer, first-time buyer relief will usually be lost. SDLT is then calculated on the actual consideration given, including both cash and any mortgage debt assumed. In the scenario discussed here, that points to chargeable consideration of £247,500 and SDLT of about £2,450.

Legal References Used

• Finance Act 2003, section 42
• Finance Act 2003, section 43
• Finance Act 2003, section 50
• Finance Act 2003, Schedule 4
• Finance Act 2003, Schedule 6ZA

This page was last updated on 22 March 2026.

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