The most common refund: the 3% surcharge
If you buy a new main home before you have sold your previous one, you usually have to pay the 3% higher-rate stamp duty surcharge (5% in Scotland under LBTT, 4% in Wales under LTT) because, on completion day, you technically own two properties.
The relief is that if you then sell your old main residence within 36 months, you can reclaim that surcharge. This is the single biggest source of stamp duty refunds in the UK, and many buyers simply do not realise they are entitled to claim it back.
Scotland and Wales operate their own equivalent schemes through Revenue Scotland (LBTT) and the Welsh Revenue Authority (LTT), with their own forms and time limits, so check the rules for the nation where the property sits.
Common stamp duty refund situations
You may be able to reclaim stamp duty in several scenarios.
| Situation | Why a refund may be due | Deadline to claim |
|---|---|---|
| Sold old home after buying new one | 3% surcharge becomes reclaimable | 12 months of selling old home, or 12 months from filing deadline (later of the two) |
| Overpaid in error | Wrong rate or calculation applied | Generally within 12 months of the filing date (4 years for some claims) |
| Uninhabitable property taxed as residential | May qualify for lower non-residential rates | Within the amendment window, take advice |
| Missed first-time buyers' relief | Eligible but full rate paid | Within 12 months of the filing date |
| Missed multiple dwellings relief (pre-abolition purchases) | Relief not applied at the time | Within the statutory time limit, check eligibility |
Time limits vary by claim type and nation. Always confirm the current deadline with HMRC, Revenue Scotland or the Welsh Revenue Authority.
How to claim the surcharge refund from HMRC
1. Confirm you qualify
You must have sold your previous main residence within 36 months of buying the new one and paid the higher rate.
2. Gather the details
You'll need both properties' addresses, the dates of purchase and sale, the SDLT amount paid, and the unique transaction reference number from the original return.
3. Submit the claim
Apply online via GOV.UK ('Apply for a repayment of the higher rates of SDLT') or by post. You can do it yourself or ask your conveyancer.
4. Wait for the repayment
HMRC typically processes valid claims within around 15 working days and pays the refund directly.
Beware stamp duty 'refund' cold-callers
Reclaim firms often contact buyers offering to recover stamp duty for a large percentage fee, sometimes pursuing aggressive 'uninhabitable property' claims that HMRC later rejects, leaving you liable to repay plus interest. You can claim a legitimate surcharge refund yourself for free. Be very cautious of any firm promising refunds on standard purchases.
Before you claim, check these points
A valid claim depends on the detail:
- Was the property you sold genuinely your previous main residence (not a buy-to-let)?
- Did you sell it within the 36-month window after the new purchase?
- Are you within the claim deadline (usually 12 months from the sale or filing date)?
- Do you have the SDLT transaction reference and completion dates to hand?
- If a firm contacts you about an 'uninhabitable' or technical refund, have you taken independent advice?
Other refunds and getting advice
Beyond the surcharge, refunds can arise where stamp duty was simply miscalculated, where a genuine relief was overlooked, or where a property's condition meant it should not have been taxed at standard residential rates. These are more technical and benefit from professional advice from a conveyancer or tax specialist.
If you think you have overpaid, start with HMRC's guidance and your original SDLT return. For straightforward surcharge refunds, the process is quick and free. For complex claims, use a regulated solicitor or accountant rather than an unregulated reclaim firm working on commission.