If you paid the 3% Stamp Duty surcharge at completion of your new home, and then sold your previous main residence within 36 months, you can reclaim the entire surcharge from HMRC. The refund is the full 3% of the purchase price — typically £6,000 to £30,000+ depending on the property value. Claim by filing form SDLT16 online within 12 months of selling the previous residence, or within 12 months of the original SDLT return filing date, whichever is later.
Who qualifies for the refund
Five conditions, all need to be met:
- You paid the 3% surcharge on the new purchase.
- You owned a property at the time of the new purchase that, at some point during your ownership, was your only or main residence.
- You disposed of that previous main residence within 36 months of the new purchase completion date.
- You (and your spouse/civil partner, if applicable) intend the new property to be your only or main residence.
- You claim within the deadline (see below).
Note: the previous residence does not have to be your main residence at the moment you sell it. It just needs to have been your main residence at some point during your ownership.
The deadline: it's two deadlines, whichever is later
The HMRC time limit for claiming the surcharge refund is the later of:
- 12 months after the date you sold your previous main residence, OR
- 12 months after the SDLT return for your new purchase was filed.
For most buyers, the first deadline (12 months after selling the old property) is the binding one. Plan to file the refund claim within 6–8 months of selling, just to leave room for HMRC queries.
Worked example
You complete on a £450,000 new home on 1 June 2025 — paying £25,000 SDLT (£10,000 standard + £15,000 the 3% surcharge × £500,000). You sell your old home on 15 March 2027 — within the 36-month window. The refund claim deadline is the later of: 15 March 2028 (12 months after sale) or 1 July 2026 (12 months after the SDLT return was filed). The deadline is therefore 15 March 2028.
How to file the claim
The refund is claimed on HMRC's online form SDLT16 (or by post if you can't use the online service). You'll need:
- The original SDLT Unique Transaction Reference Number (UTRN) from the new purchase — your conveyancer's SDLT return.
- The completion date of the original purchase.
- The completion date of the sale of your previous main residence.
- The sale price and address of the previous main residence.
- Your bank details (the refund pays into your bank account by BACS).
Filing routes:
- Online: log in to HMRC's SDLT refund service — needs a Government Gateway ID.
- Solicitor on your behalf: most conveyancing solicitors will file the refund for £150–£300. Cheaper than getting it wrong.
- Post: form SDLT16 to HMRC's Birmingham SDLT office.
HMRC pays refunds typically within 4–8 weeks. Interest is added if HMRC delays paying you, calculated from 30 days after the claim was submitted.
What HMRC actually checks
The refund claim is processed by HMRC's SDLT compliance team. They check:
- That you sold within 36 months. Conveyancing records and Land Registry filings are HMRC's primary evidence — usually unambiguous.
- That the previous property was your main residence at some point. If you only owned it as an investment and never lived in it, the refund doesn't apply. Evidence: council tax bills, utility bills, electoral roll, GP records.
- That the new property is your only or main residence. Same evidence as above.
- That you (and any spouse) didn't own another property at the date of the new purchase that wasn't being replaced. If you owned a buy-to-let alongside your main residence, that buy-to-let stays — and that's fine. The replacement-of-main-residence exception works around it.
If HMRC denies the claim, you can appeal — first within HMRC (a statutory review by a different officer), then to the First-tier Tax Tribunal. Most denied claims are denied because the previous property wasn't a main residence — get the evidence straight before claiming.
Special situations
Death of a spouse
If your spouse died and the previous main residence is in their sole name, the inheritance and subsequent sale within 36 months still triggers the refund — provided the property was the family's main residence during your spouse's ownership.
Divorce or separation
If the ownership of the previous main residence is transferred to one party as part of a divorce settlement, and then sold by that party, the 36-month clock runs from the original new purchase, not from the transfer. Document the timeline carefully — see also the divorce finance guide.
Probate delays
If the previous main residence is being sold via probate (e.g. parents' home where you lived) and the probate process pushes the sale past the 36-month window, the refund window is fixed — no statutory extension. Plan the timeline early and prioritise probate.
New property in joint names
If the new purchase is in joint names, the refund condition (replacing each owner's main residence) applies to both owners. If one owner doesn't have a previous main residence to sell, the refund only applies to the other's share — and only proportionally.
What you cannot reclaim
- The 2% non-resident surcharge. If you paid the 2% non-resident surcharge as well, that's reclaimable separately under different rules — see the non-resident surcharge guide.
- Standard SDLT. Only the 3% surcharge portion is refundable. The standard SDLT bands remain payable.
- Surcharge paid more than 36 months before the sale. The 36-month window is strict — no extensions for COVID, market conditions, or chain failures.
- If you never sold. If 36 months pass with no sale of the previous main residence, the surcharge becomes final.
Sources and methodology
The rules above follow HMRC's SDLT refund of higher-rate Stamp Duty guidance and Schedule 4ZA of the Finance Act 2003 (as amended). Each refund claim is fact-specific — for a complex situation (spouse-owned property, partial ownership, mixed use, dispute), see the tax adviser editorial recommendation. The methodology page documents how every page is researched and reviewed.
Related SDLT guides
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