Additional-property surcharge refunds
If you completed on a new main home before your old one had sold, you will have paid the higher rates for additional dwellings on the whole purchase price. Sell the previous main residence within three years of the new purchase and that surcharge can be reclaimed in full.
The deadline is the one people miss. HMRC must receive the request by the later of 12 months after the date of sale or 12 months after the filing date of the SDLT return for the new home. Miss it and an otherwise straightforward refund is lost.
We confirm the surcharge was correctly charged in the first place, check that the disposal genuinely qualifies as a replacement of a main residence, calculate the figure, and submit the claim with the evidence attached.
Typically relevant if: you owned another property when you bought, you have since sold your former main home, and the sale completed within three years of the purchase.