In order to claim back stamp duty, you will need the following details: Full names of all buyers who bought the property which attracted additional rates of SDLT Address of the property where you paid higher SDLT UTRN number (this is the Unique Transaction Reference Number and it can be obtained from your purchasing solicitor) Date you completed the purchase Address of the previous main residence, which you've sold since then Personal details of your buyer Date you completed the sale Amount of SDLT paid Amount of SDLT you think you are owed Bank account details for the refund to be paid in You will also need a scanned copy of your original SDLT return form.