Is there stamp duty to pay when staircasing a shared ownership property?

Full answer

Shared ownership lets buyers purchase a percentage share of a property (paying rent on the remaining share) and gradually buy further shares over time -- a process called 'staircasing' -- and the Stamp Duty Land Tax (SDLT) treatment depends on an important choice made at the very first purchase. **The market value election at the outset** When first buying into a shared ownership property, buyers can elect to pay SDLT upfront based on the FULL market value of the property (not just the percentage share initially being bought), even though they are only initially purchasing (say) a 25% or 40% share. Making this election means no further SDLT return needs to be filed, and no further SDLT is generally due, as the buyer staircases up to own progressively larger shares, right up to 100% ownership. **If you do not make the election** Alternatively, buyers can choose NOT to make the market value election, instead paying SDLT only on the value of the initial share actually being purchased (often resulting in a lower or nil SDLT charge at the outset, since the initial share value is smaller). However, under this approach, further SDLT may become due later as staircasing purchases push the buyer's cumulative owned share past certain thresholds (broadly, once the total share owned reaches 80% or more, a further SDLT charge is triggered on the amount by which the total consideration paid across all purchases exceeds what has already been taxed). **Worked example: market value election** A buyer purchases a 30% share of a £300,000 shared ownership property (paying £90,000 for the share, plus ongoing rent on the remaining 70%). They elect to pay SDLT on the full £300,000 market value at the outset. Assuming this falls within SDLT thresholds that generate a modest charge, they pay that amount upfront. Over the following years, they staircase up to 60%, then eventually 100% ownership -- because they made the market value election at the start, no further SDLT return or payment is required at either staircasing step, regardless of how the property's value may have changed. **Worked example: no election, SDLT deferred** A different buyer purchases a 25% share of a £280,000 property (paying £70,000) without making the market value election, and because their initial share value is modest, little or no SDLT is due at that point. They later staircase to 50%, then eventually to 85% ownership. Once their cumulative share crosses the 80% threshold, a further SDLT calculation is triggered based on the total consideration paid across all the staircasing purchases to date, potentially creating an SDLT liability at that later point that would not have arisen under the market value election approach. **Which approach is better?** The market value election is generally more attractive when the buyer is confident they will staircase to 100% (or a high percentage) eventually, since it locks in the SDLT position early (often when property values, and therefore the SDLT charge, may be lower) and avoids administrative complexity later. Buyers uncertain whether they will ever staircase significantly beyond their initial share, or who want to minimise upfront costs, may prefer to pay only on the initial share and risk a possible future charge only if and when they cross the 80% threshold. **Practical advice** Because this election is made (or not made) at the very first purchase and is generally difficult or impossible to change retrospectively, buyers should discuss the choice carefully with their conveyancing solicitor before completing the initial shared ownership purchase, considering their realistic staircasing plans and the current SDLT thresholds and rates.

Try the calculator