There are two options when it comes to paying stamp duty on a shared ownership property. You can pay full stamp duty when you buy, based on the full market value of the property.
Alternatively, you can pay stamp duty in stages as you increase your ownership. You would initially pay the tax on the share that you buy. You would not then need to pay any more until you owned more than 80% of the property.
Because the property may increase in value, you can expect to pay less stamp duty overall if you pay in full at the start. We can advise you of your options and discuss how you want to deal with stamp duty.
Some buyers might not be required to pay stamp duty at all if the property falls below the stamp duty threshold.