Shared Ownership Stamp Duty Calculator guide
Shared Ownership Stamp Duty Calculator: Pay Once or in Stages?
Use our shared ownership stamp duty calculator to compare paying SDLT once on the full market value with paying in stages, including tax on the rent.
By the AllCalculator editorial teamUpdated 16 October 20262 min read
When you buy a shared ownership home in England or Northern Ireland, you can choose how to pay Stamp Duty Land Tax. Our Shared Ownership Stamp Duty Calculator compares both options.
How to use the calculator (Shared Ownership Stamp Duty Calculator)
- Enter the home's full market value.
- Enter the share you're buying.
- Say whether you're a first-time buyer.
- Enter the yearly rent on the share you don't own and the lease length.
Your two options
Option 1: market value election. You pay stamp duty once, as if you'd bought the whole home, based on its full market value. There's nothing more to pay when you buy more shares (staircasing). The election can't be undone.
Option 2: pay in stages. You pay stamp duty only on the share you buy now. The rent on the lease can also be taxed if its net present value is over £125,000. You don't pay again until your share goes above 80%; then tax is worked out on everything you've paid in total.
A worked example
With the calculator's default settings, a £320,000 home, buying a 25% share as a first-time buyer, with £6,000 a year rent on a 990-year lease:
- Market value election: first-time buyer relief applies to the full £320,000, so £1,000
- Paying in stages: no tax on the £80,000 share, and £464 on the rent
Paying in stages costs less now, but you might pay more later if you staircase above 80%.
Which should I choose?
- If you plan to buy the whole home, the market value election can avoid a bigger bill later.
- If you're likely to stay at a smaller share, paying in stages usually costs less.
- If the full value is £125,000 or less (or £300,000 for first-time buyers), the market value election often means no tax at all.
Frequently asked questions
Can I get first-time buyer relief?
It can apply if the full market value is £500,000 or less. Your conveyancer will confirm.
What about Scotland and Wales?
They have their own rules under LBTT and LTT. See our LBTT Calculator and LTT Calculator.
For any other purchase, use our main UK Stamp Duty Calculator.
Sources and further reading
Links open official and independent websites in a new tab.
This guide is general information to help you understand your options. It isn't financial, tax, legal or building advice and doesn't take your personal circumstances into account. Figures were checked when the guide was last updated and can change, so confirm anything important with GOV.UK, HMRC, a regulated adviser or a qualified tradesperson.