Stamp Duty Multiple Dwellings Relief was an SDLT relief that cut the tax bill when someone bought two or more residential properties in a single transaction, by averaging the price across the units before applying the rate bands. It was abolished on 1 June 2024 and can no longer be claimed on any transaction that completes or is substantially performed on or after that date.1GOV.UK. SDLT Manual – SDLTM29901 – Abolition of Multiple Dwellings Relief for SDLT It still matters in 2026 for three reasons: a small tail of transitional claims, clawback obligations that run for three years after completion, and HMRC inquiry windows that reach considerably further.
How the Relief Reduced the Tax Bill
MDR applied where a buyer acquired an interest in two or more dwellings through one transaction or a group of linked transactions.2GOV.UK. Stamp Duty Land Tax Relief for Land or Property Transactions Rather than taxing the full purchase price at progressive rates, the buyer divided the total price by the number of dwellings, calculated SDLT on that average using standard residential bands, and multiplied the result by the number of dwellings. Keeping more of the price in the lower bands is what produced the saving.
A worked example. A buyer pays £1,000,000 for five flats. The average price per flat is £200,000. Using bands of 0% on the first £125,000 and 2% on the next £75,000, tax per flat is £1,500. Multiplied by five, that gives £7,500. A floor of 1% of the total consideration then applied, so the minimum SDLT on this deal was £10,000.2GOV.UK. Stamp Duty Land Tax Relief for Land or Property Transactions The floor stopped the averaging formula from stripping the bill down too far on large purchases.
What Counted as a Separate Dwelling
Most disputed MDR claims turned on this test. Each unit had to be genuinely capable of use as a standalone home, with four core facilities: a sleeping area, a living area, a bathroom with its own toilet and washing facilities, and a kitchen with the space and infrastructure for preparing meals.3GOV.UK. SDLT Manual – SDLTM00425 Appliances did not need to be fitted at the transaction date, but plumbing and power connections did. Studios combining living, sleeping, and cooking in one room still qualified.
Independent access mattered just as much. Each unit needed its own entrance from outside or from a genuine common area such as a shared hallway or staircase. HMRC did not treat the hallway of the main house as a common area, so an upstairs flat reached only through the downstairs living room would usually be treated as part of a single dwelling.3GOV.UK. SDLT Manual – SDLTM00425
Interconnecting doors did not automatically kill a claim, but they invited scrutiny. HMRC considered whether the door could be locked from both sides and whether fire and sound proofing were adequate.3GOV.UK. SDLT Manual – SDLTM00425 A detached annexe was the strongest case. A granny flat with an unlocked internal door and a shared boiler was the weakest.
The Higher Rate Surcharge Interaction
Buyers who already owned residential property faced the higher rate surcharge for additional dwellings on top of the MDR calculation. Before 31 October 2024 the surcharge was 3%; it then rose to 5%. The surcharge was added to each rate band before the MDR calculation, so every slice of the average price carried the extra percentage. For a purchase of six or more dwellings, the buyer could instead elect non-residential SDLT rates, whichever produced the lower figure.4GOV.UK. SDLT Manual – SDLTM09840 – Higher Rates for Additional Dwellings Interaction With Multiple Dwellings Relief
When You Can Still Claim MDR in 2026
Abolition was announced in the Spring Budget 2024 and took effect on 1 June 2024. A narrow transitional rule protects buyers who exchanged contracts on or before 6 March 2024, the Budget announcement date. Those buyers can still claim the relief regardless of completion date, provided the contract was not varied or assigned after 6 March 2024 and did not arise from exercising an option or right of pre-emption. If any of those exclusions apply, completion had to happen before 1 June 2024 for the claim to stand.5GOV.UK. SDLT Manual – SDLTM29902 – Abolition of Multiple Dwellings Relief for SDLT By 2026, this covers only a small number of delayed completions. If you are one of them, confirm the exchange date and check for post-announcement variations before submitting the claim.
There is one other live route. If MDR was available on a past transaction but never claimed, the return could be amended within 12 months of the filing date, and after that an overpayment relief claim under Schedule 10 of the Finance Act 2003 can be made within four years of the effective date.6GOV.UK. Stamp Duty Land Tax Online and Paper Returns For many pre-abolition transactions those deadlines have now closed or are close to it, so act quickly if you think a missed claim applies to you.
Clawback if Something Changes Within Three Years
A successful MDR claim is not final on completion day. Under Schedule 6B of the Finance Act 2003, if an event occurs during the relevant period that would have increased the tax had it happened just before completion, SDLT is recalculated as if the event had already occurred.7legislation.gov.uk. Finance Act 2003 – Schedule 6B The relevant period is the shorter of three years from the effective date, or the period ending when the buyer sells the dwellings to an unconnected person.
Event is defined broadly and covers changes of circumstance or plan. The textbook case: a buyer purchases a house with a self-contained annexe, claims MDR on two dwellings, and then knocks the annexe through within three years. Only one dwelling now exists, so the relief is recalculated and the saving disappears.
Where clawback bites, the buyer must file a further return within 30 days of the event and pay the additional tax by that filing deadline.7legislation.gov.uk. Finance Act 2003 – Schedule 6B Missing the 30-day window is a compliance failure and can lead to penalties and extended inquiry time limits. For transactions that completed in the first half of 2024, the clawback period runs into mid-2027 at the earliest.
How Long HMRC Can Look Back
Past MDR claims stay open to challenge well after the relief itself has gone. HMRC can open a discovery inquiry where it believes the relief was excessive. The standard window is four years from the effective date of the transaction, extending to six years for carelessness and 20 years where HMRC determines the claim was deliberately wrong or disclosure obligations were breached.8GOV.UK. Enquiry Manual – EM3216 – Discovery Legislation and Time Limits – SDLT Discovery Provisions
MDR was one of the more heavily challenged SDLT reliefs, particularly on annexes, converted properties, and student accommodation. If your claim relied on a borderline separate-dwelling argument, keep the supporting evidence on file: valuation reports, photographs of independent facilities, utility meter records, and council tax banding letters for the separate units. On a transaction that completed in early 2024, the standard four-year window does not close until 2028, and the carelessness and deliberate-error windows run considerably further.