Stamp duty: a guide to UK property tax

You must pay SDLT within 14 days of completing your property purchase. Your solicitor usually handles this payment as part of the conveyancing process, but it's ultimately your responsibility to ensure it's paid on time. Late payment can result in penalties and interest charges. The payment process typically works as follows: Your solicitor calculates the amount due They submit an SDLT return to HMRC They transfer the payment using funds you've provided You receive an SDLT certificate (form SDLT5) If you miss the 14-day deadline, penalties start at 10% of the duty owed for returns that are up to 12 month's late (capped at £300), 20% of the duty for returns that are 12 to 24 months late, and 30% of the duty for returns that are over 24 months late. These penalties are in addition to the outstanding duty owed.

While it's technically possible to add stamp duty to your mortgage, this isn't usually recommended. Adding it to your mortgage means you'll pay interest on this amount over the whole term of your mortgage, increasing the total cost. It's generally better to pay stamp duty upfront if you can afford to. For example, imagine your stamp duty is £10,000 and you add it to a 25-year mortgage at 4% interest. Your costs would look like this: Original stamp duty cost: £10,000 Total cost over 25 years: approximately £17,500 Additional interest paid: £7,500 So, you can see that it's worthwhile to consider alternative ways to pay your SDLT. These might include using savings, taking a short-term loan with a lower interest rate, or using a Help to Buy ISA or Lifetime ISA bonus to cover some of the cost.

Once you've paid stamp duty based on your property's purchase price, subsequent changes in the property's value don't affect your stamp duty liability. On the other hand, if your purchase falls through after paying stamp duty, you can claim a refund from HMRC within 14 days of the failed transaction or within 12 months of filing your stamp duty return, whichever is later. Common scenarios where refunds might apply: Failed purchases due to: Mortgage application rejection Survey issues Chain breakdown Contract amendments where the price is reduced after completion Specific legal circumstances such as: Contract rescission Contract annulment Property purchase declared void The refund process involves: Completing form SDLT16 Providing evidence of the failed transaction Including details of your original SDLT payment Submitting supporting documentation Waiting approximately 15 working days for processing Remember: if you're claiming a refund due to the purchase of a new main residence while still owning your previous one, you have 36 months to sell the previous residence and claim a refund of the higher rate portion of the stamp duty paid.