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Shared Ownership Affordability Calculator

Use this shared ownership affordability calculator to work out the full monthly cost of buying a share of a home: the mortgage on your share plus the rent on the share you do not own. Enter the full market value, the share you want to buy, the rent rate, your deposit, the mortgage rate and term, and your income.

Calculator

Enter your figures and click Calculate.
Please note: Estimates only, not financial advice. Actual mortgage offers depend on the lender's criteria, your circumstances, and the property. Always check the current rules and speak to a qualified mortgage adviser before making a decision.

How to use this calculator

  1. Enter the full market value of the property and the percentage share you want to buy.
  2. Enter the rent rate charged on the unowned share (2.75% a year is typical), your deposit, the mortgage rate and term, and your household income.
  3. Click Calculate to see the share price, the mortgage, the monthly rent, the total monthly cost and what share of your income that takes.

Worked example: a £300,000 home at a 50% share costs £150,000. With a £15,000 deposit the mortgage is £135,000, about £725 a month at 5% over 30 years. Rent on the other £150,000 at 2.75% is about £344 a month, so the total housing cost is about £1,069 a month, about 36.6% of a £35,000 income.

Frequently Asked Questions

How is affordability calculated for shared ownership?

Providers look at the total monthly cost — mortgage plus rent plus service charge — against your income, and check that the mortgage itself is affordable on its own.

Can I afford shared ownership on a low income?

Shared ownership is designed for people who cannot buy outright, but there are still minimum income requirements, and the total monthly cost must fit your budget after other outgoings.

What is the rent on the unowned share?

You pay rent to the housing provider on the share you do not own, usually around 2.75% of that share's value per year, reviewed annually.

Can I buy more shares later?

Yes, through staircasing you can buy further shares, usually in chunks, until you own 100% in most cases. Each step needs a fresh valuation and affordability check.

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