How much is stamp duty on shared ownership?

Stamp duty works slightly differently on a shared ownership purchase compared to other types of property transaction. If the value of your property is over the stamp duty threshold you’ll have 2 options to pay: You can either 1) make a one-off payment based on the total market value of the property at purchase, or 2) pay any SDLT (stamp duty land tax) due in stages. With the latter option you’ll normally make a payment upfront based on the share you’ve purchased and then make further payments once you own more than 80% of the market value. This isn’t tax advice, so be sure to consult an accountant or solicitor.