How to Claim Multiple Dwellings Relief: Filing Procedure
Historical guide to the MDR filing procedure, amendment process, evidence requirements, and transitional provisions. Abolished 1 June 2024.
Key Takeaways
- MDR was abolished on 1 June 2024. New claims are only possible for contracts exchanged before 6 March 2024 under transitional provisions
- MDR was not automatic: it had to be elected on the SDLT return by the buyer or their solicitor
- The SDLT return must be filed within 14 days of completion. Missing this deadline incurs automatic penalties
- If MDR was missed on the original return, it could be claimed by amending the return within 12 months of filing
- After 12 months, an overpayment claim to HMRC was required, subject to the 4-year time limit from the payment date
- Evidence needed: title documents, floor plans showing separate facilities, photos, planning consents, and evidence of habitation
- Transitional provisions apply only if contracts exchanged before 6 March 2024 AND completion before 1 March 2025
- HMRC challenges to MDR claims are common. See our guide to defending MDR claims if you receive an HMRC enquiry notice
MDR Abolished on 1 June 2024
Multiple Dwellings Relief is no longer available for new transactions. This page covers the historical filing procedure and is relevant for: (1) transitional claims where exchange was before 6 March 2024, and (2) retrospective claims for historic purchases where MDR was not originally claimed but the 4-year time limit has not yet passed.
In this article
Historical Filing Procedure
When MDR was available, the process for claiming it was part of the standard SDLT filing procedure. It was not a separate claim form or a post-completion application: it had to be built into the original SDLT return filed after completion. The return was typically prepared by the buyer's solicitor as part of the conveyancing process. For a full overview of the relief itself, see the MDR complete guide.
Steps in the MDR Claim Process (Historical)
- 1
Pre-completion due diligence
Solicitor or buyer identifies that the transaction involves 2 or more qualifying dwellings. Evidence is gathered to support the claim: floor plans, photographs, planning consents, council tax records.
- 2
Calculate the MDR liability
Solicitor calculates SDLT under the MDR formula (average price method) and compares with standard rates. If MDR produces a lower or equal liability, it is worth electing. See the MDR eligibility guide for the formula.
- 3
Completion
Transaction completes. The SDLT return filing clock starts: the return must be filed and tax paid within 14 days of the effective date (usually completion date).
- 4
File SDLT return with MDR election
Solicitor files the SDLT1 return via HMRC's online system, selecting the MDR code and inputting the number of dwellings. The lower MDR amount is declared and paid.
- 5
Retain evidence
Solicitor and buyer retain all evidence supporting the MDR claim. HMRC may open an enquiry within a window after filing. If challenged, evidence must be produced quickly. See our guide to MDR HMRC challenges.
SDLT Return Requirements
The SDLT return (form SDLT1 and supplementary forms) was the legal document through which MDR was claimed. The return had to accurately reflect the transaction and the basis on which MDR was being claimed.
Key SDLT Return Fields for MDR
The 14-Day Filing Deadline
SDLT returns must be filed and tax paid within 14 days of the effective date of the transaction. Missing this deadline triggers automatic late filing penalties. The penalty structure escalates: a fixed penalty for late filing, plus interest on unpaid tax, plus tax-geared penalties for very late filing. See our guide to 14-day deadline penalties.
See our full guide to SDLT return requirements for detailed information on the filing process, penalties, and HMRC's current guidance.
Solicitor's Role in MDR Claims
The buyer's solicitor (or licensed conveyancer) was responsible for filing the SDLT return and was the party with authority to claim MDR. Most SDLT decisions in residential conveyancing were made at the solicitor's level, and buyers relied entirely on their conveyancer to identify MDR opportunities.
Solicitor Duties
- •Identify whether the property included a potential second dwelling
- •Advise the buyer on MDR eligibility and potential savings
- •Obtain evidence to support any MDR claim
- •File the SDLT return correctly within 14 days
- •Advise on risks of HMRC challenge
- •Retain file records in case of future enquiry
Solicitor Negligence Claims
Where a solicitor failed to advise on or claim MDR when it was clearly available, buyers sometimes pursued professional negligence claims. The key factors were:
- •Was the solicitor aware the property had a second dwelling?
- •Was it obvious from documents reviewed that MDR applied?
- •Was the limitation period for negligence still live?
Professional negligence claims are complex. Legal advice is needed.
Evidence Needed
HMRC did not require evidence to be submitted with the SDLT return, but it had to be retained and produced on request. The following evidence was critical to defending any MDR claim.
Essential Evidence for Annexe/Granny Flat Claims
Property documentation
- •Floor plans showing layout of annexe and main house
- •Title deeds confirming the full extent of the property
- •Planning consent for annexe use
- •Building regulations certificate if applicable
- •Council tax records (if annexe was separately banded)
Physical evidence
- •Photographs of kitchen facilities in annexe
- •Photographs of bathroom in annexe
- •Photographs of separate external entrance
- •Estate agent particulars describing property
- •Surveyor's report if it describes the annexe
Evidence for Portfolio Purchases
- •Individual title registers for each property purchased
- •Copies of all individual contracts or the portfolio sale agreement
- •Evidence that each property was suitable for residential use at completion
- •Any apportionment of purchase price between properties if relevant
- •Evidence that the transaction or transactions were linked for MDR purposes
Amendment Process for Missed Claims
If MDR was not claimed on the original SDLT return, there were two routes to a retrospective claim, depending on how much time had passed since the original filing.
Route 1: SDLT Return Amendment
When available: Within 12 months of the filing deadline
The buyer (or their solicitor) could amend the SDLT return directly. This was the simpler and preferred route. The amended return was filed through HMRC's online system, showing the corrected MDR calculation and claiming a refund of the overpaid SDLT.
Timescale: HMRC typically processed straightforward amendments within 15 working days, though complex cases took longer.
Route 2: Overpayment Claim
When available: After 12 months from filing, up to 4 years from the payment date
A formal written claim to HMRC was required, setting out the basis for the overpayment claim and providing evidence. HMRC then reviewed the claim and either accepted it (issuing a refund) or rejected it (which could be appealed to the tribunal).
Timescale: These claims often took 3 to 12 months to resolve, especially if HMRC requested further evidence or raised substantive challenges.
Retrospective Claims Still Possible
For purchases made before 1 June 2024 where MDR was not claimed, retrospective claims may still be possible if the 4-year time limit has not expired. The 4-year period runs from the date the original SDLT payment was made. Purchases from mid-2020 onwards may still be within time. Specialist SDLT advice is strongly recommended before pursuing such claims.
Time Limits for Retrospective Claims
The time limits for MDR claims were governed by the Finance Act 2003 and the general SDLT provisions on amendment and overpayment relief.
| Route | Time limit | How to claim | Notes |
|---|---|---|---|
| SDLT return amendment | 12 months from filing deadline | Online via HMRC portal | Simplest and fastest route |
| Overpayment relief claim | 4 years from payment date | Written claim to HMRC | May be challenged; right of appeal |
| Discovery amendment (HMRC) | 4 years (careless), 20 years (fraud) | HMRC-initiated | HMRC can reclaim where MDR incorrectly claimed |
Calculating the 4-Year Limit
The 4-year limit runs from the date SDLT was paid, not from the date the return was filed (although these are usually the same). Examples:
| Completion date | SDLT paid | Amendment window closes | Overpayment claim closes |
|---|---|---|---|
| 1 January 2022 | 15 January 2022 | February 2023 | January 2026 |
| 1 June 2022 | 15 June 2022 | July 2023 | June 2026 |
| 1 June 2023 | 15 June 2023 | July 2024 | June 2027 |
Transitional Provisions
The transitional provisions were a key part of the MDR abolition announcement. They protected buyers who had already exchanged contracts before the Budget announcement on 6 March 2024.
Transitional Provisions: Critical Requirements
Contracts for the purchase must have exchanged before 6 March 2024. The exchange date is the date legally binding contracts were entered into, not the date completion was scheduled.
The transaction must have completed (legal completion taken) before 1 March 2025. Contracts exchanged before 6 March 2024 that completed on or after 1 March 2025 could not benefit from MDR.
Even under the transitional provisions, the transaction still had to meet all the standard MDR eligibility requirements: 2 or more qualifying dwellings, suitable for occupation at completion, SDLT applying.
| Exchange date | Completion date | MDR available? |
|---|---|---|
| 1 February 2024 | 1 April 2024 | Yes (transitional) |
| 5 March 2024 | 1 August 2024 | Yes (transitional) |
| 5 March 2024 | 1 March 2025 | No (completion too late) |
| 7 March 2024 | 1 May 2024 | No (exchange too late) |
| 1 October 2023 | 1 July 2024 | Yes (fully qualifying) |
Frequently Asked Questions
Can I still claim MDR on a purchase I completed in 2022 where my solicitor didn't claim it?
Potentially. The 4-year time limit for overpayment claims runs from the date SDLT was paid. Purchases completed in 2022 may still be within the 4-year window depending on the exact date. You would need to demonstrate that the transaction met all MDR eligibility requirements. A formal overpayment claim must be submitted to HMRC in writing. Given the complexity and HMRC's scrutiny of such claims, specialist SDLT advice is strongly recommended. See our guide to defending MDR claims.
What happens if HMRC rejects my overpayment claim?
If HMRC rejects an overpayment claim, the buyer can appeal to the First-tier Tribunal (Tax Chamber) within 30 days of the rejection notice. The appeal is heard de novo, meaning the tribunal considers the facts fresh rather than simply reviewing HMRC's decision. Many MDR overpayment claims that HMRC rejected were subsequently allowed by tribunals. Legal representation is strongly advisable for tribunal proceedings.
My solicitor says I don't need professional advice to claim MDR. Is that right?
For straightforward portfolio purchases of clearly separate properties, a competent solicitor could handle the MDR claim without specialist tax advice. However, for claims involving annexes, granny flats, or any situation where the dwelling status of a unit was uncertain, specialist SDLT advice was advisable. Given HMRC's aggressive approach to annexe MDR claims, many buyers found that specialist advice made the difference between a successful and an unsuccessful claim.
What is the exact exchange before 6 March 2024 test for transitional relief?
The transitional provision required that contracts were entered into before 6 March 2024. This means the date on which legally binding contracts for the sale were exchanged, not the date of any earlier agreement, reservation, or heads of terms. For most residential transactions, exchange of contracts is a well-defined event documented by the solicitor. If the exchange happened on 6 March 2024 itself (the Budget day), the provision did not apply: contracts must have exchanged strictly before that date.
Did MDR have to be claimed before completion or could it be claimed after?
MDR was claimed on the SDLT return filed after completion, not before it. Pre-completion, a solicitor would identify the MDR opportunity and plan the return accordingly. But the formal claim was made when the SDLT return was filed within 14 days of completion. There was no requirement to notify HMRC of an intention to claim MDR before completing the transaction.
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Emma Richardson, MRICS
Chartered Surveyor & Property Tax Specialist
Emma Richardson is a RICS-qualified Chartered Surveyor with over 12 years of experience in UK property taxation. She founded Stamp Duty Calculator to help buyers understand the complex world of property transaction taxes.
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