Claiming a Stamp Duty Refund UK 2026: When and How

Stamp Duty Land Tax (SDLT) catches a lot of buyers off guard, and overpayments are more common than you might think. Whether you paid the higher-rate surcharge on a second property, rushed through a purchase as a first-time buyer, or are still sitting on an unapplied Multiple Dwellings Relief (MDR) claim from before the rules changed, there are legitimate routes to claim your money back from HMRC.

The Higher-Rate Surcharge Refund: The Most Common Claim

If you bought a second property and paid the 3% SDLT surcharge, but you subsequently sold your previous main residence within 3 years of the purchase date, you are entitled to a refund of that surcharge. This is a significant amount of money -- on a GBP 400,000 purchase the surcharge alone would have been GBP 12,000.

The 3-year window is strict. HMRC will not accept a late claim unless there were exceptional circumstances, such as a global event preventing the sale (as happened with COVID-19 in 2020). If you sold just inside the 3-year mark, make sure you submit promptly.

To make the claim you need to write to HMRC's Stamp Taxes team or use their online form. You will need:

• The Unique Transaction Reference (UTR) from your original SDLT return
• The date of sale of the previous main home
• Evidence that the property sold was genuinely your main residence

HMRC typically processes refunds within 15 working days, though complex cases take longer.

What Counts as Your Main Residence?

This is where disputes arise. HMRC looks at where you were registered to vote, which address your bank used, where your children went to school, and where you spent the majority of your nights. A property you owned but rarely lived in is unlikely to qualify. If you have two properties and it is genuinely unclear which was your main home, consider taking professional advice before submitting a claim that could trigger an enquiry.

First-Time Buyer Relief: When Refunds Arise

From April 2025 the first-time buyer relief (FTB) thresholds changed. For purchases from that date, FTB relief applies as follows: nil SDLT up to GBP 300,000, then 5% on the portion between GBP 300,001 and GBP 500,000. Properties over GBP 500,000 get no FTB relief at all.

If a conveyancer applied standard rates when relief should have applied, or if a buyer was misclassified as not being a first-time buyer, a refund is available. The deadline is 12 months from the filing date of the original SDLT return, or 12 months from the date of the transaction, whichever is later -- so act quickly.

You cannot claim FTB relief if you (or anyone buying jointly with you) have previously owned a residential property anywhere in the world. That global rule catches a lot of people who owned property abroad.

MDR Abolition: What It Means for Existing Claims

Multiple Dwellings Relief was abolished from 1 June 2024. Any transactions that exchanged contracts before that date could still benefit from MDR if completion happened after. If you bought several dwellings in a single transaction (for example, a block of flats or a house with a self-contained annexe) and your solicitor did not claim MDR, you may have a case for an amendment to the original SDLT return.

The window to amend an SDLT return is 12 months from the filing deadline (which is 14 days from completion). After that, a standalone overpayment relief claim can be made to HMRC within 4 years of the effective transaction date. If your purchase was in 2022 or 2023 and involved multiple dwellings, it is worth reviewing your original SDLT return now.

How to Submit an Overpayment Relief Claim

For transactions where the normal amendment window has closed, HMRC accepts overpayment relief claims under Schedule 11A of the Finance Act 2003. Your letter or form must include:

• Full details of the original transaction
• An explanation of why you believe tax was overpaid
• A calculation showing the correct SDLT due
• Supporting evidence

HMRC has up to 12 months to decide on the claim. If they refuse, you can appeal to the First-tier Tribunal (Tax Chamber).

Common Mistakes to Avoid

Claiming a refund you are not entitled to will attract penalties and interest. Do not assume a property automatically qualifies as a main home without evidence, and do not conflate the higher-rate surcharge refund with overpayment relief -- they are different legal routes with different deadlines.

Always keep copies of your SDLT return, completion statement and any correspondence with HMRC. These are essential if a claim is queried.

Calculate Your Potential SDLT Position

Before you buy -- or before you claim -- it pays to understand exactly what SDLT you owe or owed. Use the CalcHub Stamp Duty calculator to check your figures:

Stamp Duty Calculator -- CalcHub