How do I claim an SDLT refund?

You can claim an SDLT refund by amending your SDLT return within 12 months of the filing date, or by making an overpayment relief claim within four years of the relevant tax year. There are two routes to claiming an SDLT refund. The first is to amend the SDLT return. This must be done within 12 months of the filing date (the date the return was submitted). The amendment can be made online through HMRC's portal or by post. The second route is a formal overpayment relief claim under Section 80 of the Finance Act 1989. This is available if the 12-month amendment window has passed, and must be made within four years of the end of the tax year in which the transaction took place. The overpayment relief claim is a more formal process and requires a written claim to HMRC. Relevant legislation: Schedule 10 Finance Act 2003, Paragraph 34 (amendment); Section 80 FA 1989 (overpayment relief). Example: A client purchased a property in June 2022 and filed the SDLT return in July 2022. The 12-month amendment window expired in July 2023. The overpayment relief window is open until 5 April 2027 (four years after the end of tax year 2022/23). We submitted an overpayment relief claim in 2024 and secured a refund of £48,000. Common mistake: Assuming that once the 12-month amendment window has passed, nothing can be done. The four-year overpayment relief window is a vital second route.

How long do I have to claim an SDLT refund?

You can amend your SDLT return within 12 months of the filing date. After that, you can make an overpayment relief claim within four years of the end of the relevant tax year. The time limits for SDLT refunds depend on the route. For an SDLT return amendment, the deadline is 12 months from the filing date. For an overpayment relief claim, the deadline is four years from the end of the tax year in which the transaction took place. For example, a transaction in August 2021 (tax year 2021/22) can be amended until August 2022 (12 months from filing) or claimed via overpayment relief until 5 April 2026 (four years after the end of 2021/22). Relevant legislation: Schedule 10 Finance Act 2003, Paragraph 34; Section 80 FA 1989. Example: Transaction date: 15 September 2021. Filing date: 10 October 2021. Amendment deadline: 10 October 2022. Overpayment relief deadline: 5 April 2026 (four years after end of tax year 2021/22). Common mistake: Missing the deadlines. After the overpayment relief window closes, it is extremely difficult to recover overpaid SDLT.

What are the most common SDLT refund scenarios?

The most common SDLT refund scenarios are: properties incorrectly classified as residential when they should be mixed-use; failure to claim Multiple Dwellings Relief (pre-June 2024); the 3% surcharge applied incorrectly; and failure to claim first-time buyer's relief. Based on our experience, the most common SDLT overpayment scenarios are: (1) Mixed-use property classified as residential — properties with commercial elements that should have been treated as non-residential. (2) MDR not claimed — properties with multiple dwellings where MDR was available (pre-June 2024 transactions). (3) 3% surcharge errors — the surcharge applied when the buyer was replacing their main residence, or when the property was mixed-use. (4) First-time buyer's relief not claimed — eligible first-time buyers who did not claim the relief. (5) 15% rate applied to company purchases when an exemption was available. Each of these scenarios can result in significant overpayments that are recoverable. Relevant legislation: Various SDLT provisions. Example: A client purchased a rural property with outbuildings for £1.2 million. The conveyancer treated it as residential, paying SDLT of £64,250. We identified that the property qualified as mixed-use, amended the return, and secured a refund of £14,750. The total SDLT was recalculated at £49,500. Common mistake: Not reviewing past property transactions for SDLT overpayments. Many buyers assume that because the SDLT return was filed by a professional, the amount must be correct.

How much SDLT can I reclaim?

The amount depends on the transaction. Our SDLT refunds have ranged from £5,000 to £335,000 per transaction, with total recoveries exceeding £900,000 for our clients. The amount of SDLT that can be reclaimed depends on the nature of the overpayment. Mixed-use reclassification on high-value properties can save tens or hundreds of thousands of pounds. MDR claims (pre-June 2024) can save similar amounts. 3% surcharge refunds depend on the property value (the surcharge is 3% of each SDLT band). First-time buyer's relief depends on the property value. Our largest single refund was £335,000 on a mixed-use reclassification, and our total client recoveries exceed £900,000. Relevant legislation: Various SDLT provisions. Example: On a £2 million property: if incorrectly classified as residential with the 3% surcharge (SDLT: £153,750) and reclassified as mixed-use (SDLT: £89,500), the refund would be £64,250. On a £1.5 million property with an annexe where MDR was not claimed (pre-June 2024): SDLT paid £93,750, SDLT due with MDR approximately £7,500, refund £86,250. Common mistake: Assuming the refund amount is too small to be worth claiming. Even modest overpayments of £5,000-£10,000 are worth reclaiming, and the actual refund is often much larger.

Will HMRC challenge my SDLT refund claim?

HMRC may open an enquiry into the claim, particularly for mixed-use reclassifications or MDR claims. Proper documentation and specialist advice significantly reduce the risk of a successful challenge. HMRC has the right to open an enquiry into SDLT return amendments and overpayment relief claims. The enquiry window for an amendment is typically 12 months from the date the amendment was filed. For overpayment relief claims, HMRC may investigate the claim. Claims that are well-documented, with proper analysis and evidence to support the reclassification or relief, are less likely to be challenged. We provide detailed analysis and documentation with every claim, and we handle any HMRC enquiries on behalf of our clients. Relevant legislation: Schedule 10 Finance Act 2003, Paragraph 12 (enquiry provisions). Example: We submitted a mixed-use reclassification claim for a £1.5 million property. HMRC opened an enquiry. We provided detailed evidence of the commercial use of part of the property, including photographs, tenancy agreements, and business rates records. HMRC closed the enquiry without adjustment, and the refund of £59,000 was confirmed. Common mistake: Submitting a refund claim without proper documentation or analysis. A poorly supported claim is more likely to be challenged and rejected.

SDLT Advisory › Refunds

SDLT Refunds & Reclaims

If you've overpaid SDLT, you may be entitled to a refund. We've helped clients reclaim over £900,000 in incorrectly paid stamp duty. Find out if you can claim.

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SDLT is frequently overpaid. Whether through incorrect property classification, failure to claim reliefs, or misapplication of the 3% surcharge, many property transactions result in SDLT overpayments. The good news is that overpaid SDLT can often be reclaimed through amendment of the SDLT return or a formal overpayment relief claim. We have helped clients reclaim over £900,000 in incorrectly paid SDLT.

Common Reasons for SDLT Overpayment

SDLT is most commonly overpaid in the following scenarios: properties incorrectly classified as residential when they should be mixed-use; failure to claim Multiple Dwellings Relief (for pre-June 2024 transactions); the 3% surcharge applied when it should not have been; failure to claim first-time buyer's relief; and the 15% rate applied to company purchases when an exemption was available. Many of these overpayments can be reclaimed.

Time Limits for SDLT Refunds

There are two main routes to reclaiming overpaid SDLT. First, the SDLT return can be amended within 12 months of the filing date — this is the simplest route. Second, if the amendment window has passed, a formal overpayment relief claim can be made under Section 80 of the Finance Act 1989, within four years of the end of the relevant tax year. This means transactions going back several years may still be eligible for a refund.

How We Can Help

We review property transactions to identify SDLT overpayments, prepare and submit amendment or overpayment relief claims, and handle all communications with HMRC. Our SDLT advisers have extensive experience in reclaiming overpaid SDLT, with total recoveries exceeding £900,000 for our clients. We work on a transparent fee basis and only charge for successful claims.

The Refund Process

The refund process typically takes 8-12 weeks from submission of the claim to receipt of the refund. For SDLT return amendments, HMRC has 21 days to process the amendment. For overpayment relief claims, HMRC may take longer and may open an enquiry into the claim. We handle the entire process from initial review to receipt of the refund.

Key Points

What You Need to Know

SDLT can be reclaimed by amending the return within 12 months of filing
Overpayment relief claims can be made within 4 years of the relevant tax year
Common overpayments: incorrect residential classification, unclaimed MDR, 3% surcharge errors
We've helped clients reclaim over £900,000 in overpaid SDLT
The refund process typically takes 8-12 weeks

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