Shared Ownership Mortgage Calculator 2026
Instantly calculate your mortgage, rent, and total monthly costs for a shared ownership property. A free UK housing tool for first-time buyers.
Shared Ownership Projection
Enter your property details to calculate monthly costs
The full market value of the property you wish to buy.
The percentage of the property you are buying (typically 25% to 75%).
The cash deposit you are putting towards your share of the property.
The annual interest rate on your mortgage for the purchased share.
The length of your mortgage agreement in years.
The annual rent percentage charged on the portion of the property you do not own.
Your Shared Ownership Estimate
Monthly payment, rent, and total cost breakdown
Enter your property details above and click Calculate Costs to reveal your shared ownership projection.
Shared Ownership Benchmarks
Quickly reference the key differences between shared ownership and traditional mortgages to understand which option best suits your budget and homeownership goals.
| Feature | Shared Ownership | Traditional Mortgage |
|---|---|---|
| Deposit Required | % of your share (e.g. 5-10%) | % of total property value (e.g. 10%) |
| Monthly Costs | Mortgage + Rent on unowned share | Mortgage payment only |
| Ownership Level | Partial (e.g. 25% to 75%) | 100% ownership |
| Eligibility | Income caps, first-time buyers | Open to all (subject to affordability) |
| Staircasing | Can buy more shares later | N/A (already own 100%) |
Shared Ownership Mortgage FAQ
Everything you need to know about shared ownership mortgages, calculating rent on unowned shares, and navigating the UK property ladder.
Shared ownership is a government-backed scheme that helps you buy a home. You purchase a share of the property (usually between 25% and 75%) and pay a subsidised rent on the remaining share, which is typically owned by a housing association.
The rent is calculated as a percentage of the annual value of the unowned share. For example, if the unowned share is worth £200,000 and the rent rate is 3%, the annual rent is £6,000, or £500 per month.
You usually need a deposit of 5% to 10% of the value of the share you are buying, not the total property value. For example, if you are buying a 25% share of a £300,000 home (£75,000), a 10% deposit would be £7,500.
Yes, this process is called ‘staircasing’. You can buy additional shares in your home, usually in increments of 10% or more, until you own 100% of the property. The cost of additional shares is based on the current market value at the time you buy them.
Eligibility varies, but generally, your annual household income must be £80,000 or less (£90,000 in London). You must be at least 18 years old, and in England, the scheme is primarily for first-time buyers, or those who used to own a home but can’t afford to buy one now.
You can choose to pay Stamp Duty Land Tax (SDLT) on the full market value of the property upfront, or just on your initial share. If you staircase to 100% ownership later, you may have to pay additional SDLT depending on the final value and your chosen method.