SDLT on Parent‑to‑Child Transfers with Gifted Equity
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Do you pay SDLT on the price paid or the full market value when a parent sells a property to a child at undervalue?
Introduction
A common question in family property transfers is whether Stamp Duty Land Tax (SDLT) is charged on the amount actually paid or on the property’s full market value. This often comes up where a parent sells a property to an adult child for less than it is worth and gifts the remaining equity.
The answer usually turns on one key point: what counts as the transaction’s chargeable consideration under the Finance Act 2003. In many straightforward transfers between individuals, SDLT is charged on the actual consideration given, not on the market value. But the detail matters, especially if there is a mortgage involved or if the buyer will not live in the property as their main home.
The Question
A parent is transferring a residential property to an adult child. The child will pay £175,000 and the parent will gift the remaining equity, with the property said to be worth about £270,000 in total. The buyer is a first-time buyer but will initially keep the property as a buy-to-let rather than occupy it as their only or main residence.
The issue is whether SDLT should be calculated on:
- £175,000, being the amount actually paid, or
- £270,000, being the property’s market value.
A related concern is what happens if the SDLT return is filed on the lower figure and HMRC later disagree.
Nick’s Explanation
Nick’s reasoning was that SDLT is generally charged on the transaction’s chargeable consideration, not automatically on market value. In his words, anonymised for publication, “SDLT is charged by reference to the transaction’s chargeable consideration, not the property’s market value, unless a specific market-value rule applies.”
He explained that the main market value substitution rule in section 53 Finance Act 2003 applies where the purchaser is a company connected with the seller. It does not apply simply because the parties are related individuals.
On the facts described, his view was that if the buyer pays £175,000 and does not take on any additional mortgage debt beyond that amount, the chargeable consideration is £175,000. The gifted equity does not itself become chargeable consideration.
Nick also explained that first-time buyers’ relief would not be available if the buyer does not intend to occupy the dwelling as their only or main residence at completion. Because the property is being acquired as a buy-to-let, the normal residential rates apply instead.
He calculated the SDLT on £175,000 as:
- 0% on the first £125,000 = £0
- 2% on the next £50,000 = £1,000
That gives total SDLT of £1,000, assuming no higher rates apply and no extra debt is being assumed.
On the risk of HMRC challenge, Nick’s explanation was that if HMRC took a different view, they would normally seek the additional tax and interest. Penalties would usually depend on whether HMRC considered the return inaccurate because of a failure to take reasonable care.
The Law
SDLT is charged under the Finance Act 2003. The main provisions relevant to this type of transaction are as follows.
- Section 42: SDLT is charged on land transactions.
- Section 50 and Schedule 4: these deal with chargeable consideration.
- Section 53: this is the market value rule in certain company-connected transactions.
- Section 55: this sets out how the tax is calculated using the relevant rate bands.
- Section 57B and Schedule 6ZA: these govern first-time buyers’ relief.
- Schedule 4ZA: this contains the higher rates for additional dwellings.
- Section 75A: this is the anti-avoidance rule for certain SDLT arrangements.
- Section 80, section 91 and Schedule 12: these cover HMRC assessments, interest and penalties.
In broad terms, SDLT is calculated by reference to the consideration given for the land transaction. In a normal sale between individuals, that means the money paid and any other consideration given, such as debt taken on by the buyer.
There is no general SDLT rule saying that all transfers between connected individuals must be taxed on market value. That is a point often confused with other tax regimes.
Section 53 does contain a market value substitution rule, but it is targeted. It applies where the purchaser is a company and the seller is connected with that company. It does not apply simply because a parent sells to a child.
For first-time buyers’ relief, Schedule 6ZA requires not only that the buyer has never previously owned a major interest in a dwelling, but also that they intend to occupy the purchased dwelling as their only or main residence. A buy-to-let purchase will usually fail that condition.
Analysis
Step 1: identify the consideration actually given.
If the buyer is paying £175,000 and the seller is simply giving away the remaining equity, the starting point is that the chargeable consideration is £175,000. A gift element is not, by itself, chargeable consideration for SDLT.
Step 2: ask whether any market value rule overrides that figure.
In this scenario, the buyer is an individual, not a company. That means the section 53 market value substitution rule does not apply. So there is no automatic replacement of the £175,000 with the £270,000 market value merely because the parties are parent and child.
Step 3: check whether the buyer is assuming mortgage debt.
This is the main practical caveat. If the buyer takes over responsibility for an existing mortgage, that assumed debt can count as chargeable consideration under Schedule 4. If the arrangement is simply that the buyer pays £175,000 and that money is then used to clear the seller’s mortgage, the consideration may still just be £175,000. But if the buyer assumes debt in addition to paying £175,000, that extra amount must be included.
Step 4: consider first-time buyers’ relief.
Although the buyer may be a first-time buyer in the ordinary sense, relief under Schedule 6ZA also requires an intention to occupy the property as the buyer’s only or main residence. If the property is being bought as a buy-to-let, the relief is not available at completion.
Step 5: consider the higher rates for additional dwellings.
If the buyer owns no other dwelling at completion, Schedule 4ZA should not apply. So the 3% higher rates surcharge would not be added on these facts.
Step 6: calculate the tax using section 55.
On chargeable consideration of £175,000, and using the ordinary residential rates referred to in the source advice, the calculation is:
- 0% on the first £125,000 = £0
- 2% on the next £50,000 = £1,000
Total SDLT: £1,000.
Step 7: consider what happens if HMRC disagree.
If HMRC open an enquiry or otherwise conclude that too little SDLT was paid, they would normally assess the additional tax and charge interest from the effective date of the transaction. Whether a penalty is charged depends on the facts, especially whether the return was careless or whether reasonable care was taken. A genuine legal disagreement on a properly considered return is not the same thing as deliberate understatement.
Outcome
On the facts described, the better view is that SDLT is charged on the £175,000 actually given as consideration, not on the £270,000 market value, provided that:
- the buyer is an individual rather than a company, and
- there is no additional assumed mortgage debt beyond the £175,000 payment.
On that basis, the SDLT liability is £1,000 using the rate structure set out in the advice.
First-time buyers’ relief is not available because the buyer does not intend to occupy the property as their only or main residence at completion. The higher rates for additional dwellings should not apply if the buyer owns no other dwelling at that time.
If HMRC later took a different view, the most likely result would be an assessment for the extra tax plus interest. A penalty would depend on whether HMRC considered the return careless.
Practical Steps
If you are dealing with a similar transfer, the key points to check are:
- Confirm the exact consideration being given. Is it only a cash payment, or is any mortgage debt also being assumed?
- Ask the conveyancer to identify the precise statutory provision if they say market value must be used between individuals.
- Check whether the buyer will occupy the dwelling as their only or main residence at completion. If not, first-time buyers’ relief is unlikely to apply.
- Check whether the buyer owns any other residential property at completion, as that affects the higher rates.
- Keep a clear written record of how the SDLT figure was reached, including whether the mortgage is being redeemed by the seller from sale proceeds or formally assumed by the buyer.
- If there is uncertainty, make sure the SDLT return reflects the actual legal structure of the transaction rather than broad assumptions about family transfers.
Conclusion
Where a parent sells a property to a child at undervalue and gifts the remaining equity, SDLT is not automatically charged on market value. In a normal transfer between individuals, the tax is usually based on the chargeable consideration actually given. On the facts discussed here, that points to SDLT on £175,000 rather than £270,000, subject to the important mortgage assumption point.
Legal References Used
- Finance Act 2003, section 42
- Finance Act 2003, section 50
- Finance Act 2003, Schedule 4
- Finance Act 2003, section 53
- Finance Act 2003, section 55
- Finance Act 2003, section 57B
- Finance Act 2003, Schedule 6ZA
- Finance Act 2003, Schedule 4ZA
- Finance Act 2003, section 75A
- Finance Act 2003, section 80
- Finance Act 2003, section 91
- Finance Act 2003, Schedule 12
This page was last updated on 22 March 2026.
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