The 12-Month Statutory Amendment Window
Under Paragraph 6 of Schedule 10 to the Finance Act 2003, a taxpayer has an absolute statutory right to amend their Land Transaction Return (Form SDLT1) within 12 months of the filing date.
For example, if you completed on 15 November 2025 and your return was submitted on 20 November 2025, you have until 20 November 2026 to submit an amendment.
Common scenarios where refunds arise include:
1. Conveyancing Oversight: The conveyancer was provided with an agreed TA10 fittings schedule for £12,000, but entered the gross purchase price in Box 10 by mistake.
2. Post-Exchange Chattels Agreement: The buyer and seller agreed an itemised contents purchase during conveyancing that was not reflected in the initial SDLT calculation.
| Metric | Original Return Filed | Amended Return (Chattels Deducted) | Refund Due |
|---|---|---|---|
| Agreed Gross Contract Price | £500,000 | £500,000 | — |
| Chattels Apportioned (TA10) | £0 | £12,000 | +£12,000 |
| Net Chargeable Consideration | £500,000 | £488,000 | -£12,000 |
| Standard SDLT Payable (5% Band) | £12,500 | £11,900 | — |
| HMRC Overpayment Cash Refund | — | — | £600.00 |
How to Submit an SDLT Amendment to HMRC
To request an overpayment repayment:
1. Write directly to HMRC Stamp Taxes (Birmingham Office) quoting the Unique Transaction Reference Number (UTRN).
2. Enclose a copy of the original contract, the signed Law Society TA10 schedule, and photographic inventory.
3. Include a revised SDLT calculation showing the lower chargeable land consideration and the resulting tax difference.
4. Provide your nominated bank details (account name, sort code, account number) for electronic repayment.