Stamp duty on shared ownership: the rules explained

Shared ownership has its own SDLT rules, and the amount due can depend on how you choose to pay and when you buy extra shares. Buyers usually need to look at whether the lease was granted by an approved qualifying body, whether to make a market value election, and whether first-time buyer relief applies. The rates below were verified against HMRC guidance in August 2026; SDLT thresholds should be confirmed against GOV.UK before any Budget changes are relied on.

How SDLT works on shared ownership

HMRC’s guidance says shared ownership SDLT is worked out each time you buy a share, and those transactions are treated as linked transactions for SDLT. The special shared ownership payment options only apply where the lease is granted by an approved qualifying body, such as a housing association or local authority.

The market value election

One option is a market value election, which means a one-off SDLT payment calculated as if you bought the whole property outright. HMRC’s guidance says that if you make this election, you do not pay further SDLT on later staircasing. the election is irrevocable, but can be made up to 12 months after the filing date by amending the SDLT return.

Paying in stages

The other route is to pay any SDLT due in stages. HMRC says SDLT is first charged on the premium paid for the grant of the lease. On later staircasing, the guidance says no SDLT is due until your share goes above 80%; once it does, you file a return and pay SDLT on the transaction that took you over 80% and on any further transactions.

First-time buyer relief

Dwellmark’s source notes say first-time buyers of a shared ownership property can claim relief where the market value is £500,000 or less, whether they choose a market value election or pay in stages, and that the relief also covers the rent. the relief does not apply when buying further shares later through staircasing.

Thresholds to check

The current residential SDLT thresholds, fetched on 9 August 2026, are £125,000 for standard residential purchases and £300,000 for first-time buyers buying a property worth £500,000 or less. The notes also say first-time buyer relief means no SDLT up to £300,000, 5% on the portion from £300,001 to £500,000, and no relief above £500,000. They add that SDLT thresholds and rates changed on 1 April 2025 and that no further threshold change had been published on GOV.UK as of 9 August 2026, so this should be re-checked against the current GOV.UK page before relying on it.

Key facts

Source: HMRC - SDLT: shared ownership property — Guidance checked August 2026

Source: HMRC - SDLT: shared ownership property — Guidance checked August 2026

Source: HMRC - SDLT: shared ownership property — Guidance checked August 2026

Source: HMRC - SDLT: shared ownership property — Guidance checked August 2026