SDLT multiple homes relief: what happens when homes are combined
In short
HMRC’s Example 10 shows why later sales and mergers of homes can matter after a historic SDLT multiple homes relief claim.
- An unconnected buyer’s later merger does not affect the original claim in HMRC’s example.
- A connected buyer’s later merger can require the original SDLT to be recalculated.
- The original purchase date must be checked before relying on this historic rule.
Scroll down for the full analysis.
Read the original guidance here:
SDLT multiple homes relief: what happens when homes are combined
SDLT multiple homes relief: what happens when homes are combined
Buying several homes at once could once reduce your stamp duty bill. Later changes, however, may matter. HMRC’s example indicates that combining two homes can require SDLT to be worked out again, particularly following a sale to a close relation.
What this rule is about
This page considers a historic example of relief for buying more than one home at once. Its focus is what happens after purchase, rather than whether the original claim was valid.
An easily missed point is that selling a home does not always close the period during which later changes can affect the claim. The identity of the buyer matters.
What the official source says
HMRC gives an example in which a man buys six semi-detached houses, then sells and combines pairs over the following period of eighteen months. HMRC’s manual sets out its view of the rules. It is not the law itself.
- Six months after buying, he sells two houses to an unconnected buyer.
- That buyer joins those two houses into one property.
- Six months later, he sells two other houses to his wife, who joins them into one.
- After a further six months, he joins the remaining two houses and sells the result to an unconnected buyer.
According to HMRC, the first outside sale closes the relevant period for the two houses sold. As a result, their later merger does not affect the original relief claim.
The sale to his wife produces a different outcome. HMRC says that the sale itself is not the event that changes the tax. The period remains open, however, because she is connected to him. Her subsequent merger of the two houses is treated as an event affecting his original purchase.
- After his wife’s merger, HMRC works from five homes rather than six.
- Those five are the one combined property, the two houses first sold outside the family, and the two he still owns.
- When he merges his final two houses, HMRC works from four homes.
- The final sale to an unconnected buyer ends the period completely, eighteen months after the purchase.
What this means in practice
Combining two homes can reduce the number of separate homes used in the original SDLT calculation, and, if that would have produced more tax on the purchase date, the legislation can require recalculation. That can change the result.
Because the wife is connected to the original buyer, her merger matters in this example, whereas a later change by a genuinely unconnected buyer does not affect the two homes already sold to them. Connection is the distinction.
- Keep track of each home, not just the overall site.
- Record the date of every sale and merger.
- Check the relationship between the original buyer and every later buyer.
How to analyse it
Begin with the original purchase and the relief claim. Then trace every later event in sequence. Do not assume a sale closes the issue for all the homes bought.
- Check whether the original purchase used the historic multiple homes relief.
- List every home included in that purchase.
- Put later sales and building changes in date order.
- For each sale, ask whether the buyer was unconnected to the original buyer.
- Ask whether a later merger changed how many separate homes remain for the calculation.
Under Schedule 6B, the period normally lasts for up to three years from the transaction date. It can end sooner when the buyer sells the homes to someone unconnected with them. The detail matters here.
Example
Suppose Alex buys six houses and claims the historic relief. Six months later, Alex sells Houses 1 and 2 to an unrelated buyer. That buyer later combines them. On HMRC’s view, the merger does not alter Alex’s original SDLT position for those houses.
Alex then sells Houses 3 and 4 to Alex’s spouse. The spouse combines them into one home. HMRC says the original calculation is then redone using five homes. When Alex combines Houses 5 and 6, it is redone using four homes.
No SDLT figure can be shown from this example because HMRC gives no prices. The issue is the changing number of homes, rather than a fixed tax amount.
Why this can be difficult in practice
You may think that a sale settles the matter. It may not. A sale to a close relation can leave the original buyer exposed to later consequences of changes made by that person.
Timing is another difficult point. A merger may occur after a sale, yet the answer can still turn on whether the statutory period remained open for those particular homes.
- A buyer may wrongly treat every later sale as ending the period.
- A family relationship may need checking against the statutory connected-person test.
- Plans may show when work started, but not when two homes legally became one.
- The original purchase date is essential because this is a historic relief.
Key takeaways
- A later merger can change the SDLT calculation for a historic relief claim.
- A sale to an unconnected buyer can close the period for the homes sold.
- HMRC says a merger after a connected sale can still affect the original buyer.
Technical analysis
For advisers, and for anyone who wants to check the law behind this page. You do not need this section to understand the guidance above.
Legislation
- FA 2003 section 58D — relief for transfers involving multiple dwellings
- FA 2003 Schedule 6B para 6 — tax adjustment after a later change
Official guidance
The pages below are HMRC’s guidance. Guidance is not law. It sets out how HMRC reads the legislation, and it is not binding on you, on a tribunal or on a court. Where guidance and the legislation differ, the legislation wins. HMRC can also change or withdraw guidance, and it may not cover your facts.
Where this is not settled
- The source does not give the date of the original purchase. That date must be checked before relying on this historic relief example.
- The source does not explain every fact that may affect whether people are connected for the statutory test.
- The source does not give enough information to calculate the extra SDLT.
Evidence you would need
This kind of case is decided on the facts of the individual property. These are the records that usually settle it, and the ones an adviser would ask you for.
- The completion date of the original purchase
- The dates and contracts for each later sale
- Evidence of whether each later buyer was connected to the original buyer
- Plans and records showing when each pair of homes became one property
- The original SDLT return and relief claim
Explore this with an AI
Readers often want to test their own situation. Copy the prompt below into ChatGPT, Claude or Gemini. It hands the model the actual legislation for this page rather than letting it answer from memory, and tells it to be explicit about what is uncertain. What comes back is information, not advice – check it against the links above.
I am researching UK Stamp Duty Land Tax (SDLT), which applies in England and Northern Ireland. MY QUESTION SDLT multiple homes relief: what happens when homes are combined [Replace this with your own situation: what you are buying, the price, the dates, who the buyer is, and what you plan to do with the property.] THE LAW THIS TURNS ON - FA 2003 section 58D - relief for transfers involving multiple dwellings https://www.legislation.gov.uk/ukpga/2003/14/section/58D/2025-11-17 - FA 2003 Schedule 6B para 6 - tax adjustment after a later change https://www.legislation.gov.uk/ukpga/2003/14/schedule/6B/paragraph/6/2025-11-17 HMRC's guidance page on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm29987 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. HMRC guidance is HMRC's view of the law, not the law, and does not bind a tribunal or a court. 2. Tell me what the rule actually requires, in plain English. 3. Tell me which facts decide the answer, and which facts would change it. 4. Tell me what evidence I would need to support the position. 5. Be explicit about anything unsettled or fact-sensitive. Do not guess. 6. Your training data has a cutoff and SDLT rates and reliefs change at fiscal events. Say so if you are not sure the law is current. POINTS ALREADY KNOWN TO BE UNCERTAIN ON THIS TOPIC - The source does not give the date of the original purchase. That date must be checked before relying on this historic relief example. - The source does not explain every fact that may affect whether people are connected for the statutory test. - The source does not give enough information to calculate the extra SDLT. Do not give me a conclusion you cannot support from the provisions above.
Legislation links show Finance Act 2003 as it stood on 2025-11-17. The law may have changed since, and the rules that apply are those in force on the date of your transaction. The official guidance this page is based on is here.
This page was last updated on 1 September 2026
Useful article? You may find it helpful to read the original guidance here: SDLT multiple homes relief: what happens when homes are combined
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