Use this Shared Ownership Calculator to estimate the monthly cost of buying a share of a property in the UK. Enter the property value, your ownership percentage, deposit, mortgage interest rate, mortgage term, and rent rate on the remaining share.
The calculator estimates your mortgage repayment and rent payment, then combines them to show your total estimated monthly cost.
Calculate Your Share Value and Deposit
In a shared ownership arrangement, you purchase a percentage of a property and pay rent on the portion you do not own.
For example, if a property is worth £300,000 and you buy a 25% share, your share is worth £75,000. With a 10% deposit on that share, your deposit would be £7,500, leaving £67,500 to finance through a mortgage, assuming the figures entered are accurate.
Estimate Your Monthly Mortgage Repayment
Your mortgage payment depends on the amount borrowed, the interest rate, and the repayment term.
A larger deposit reduces the mortgage amount, while a longer term generally lowers the monthly repayment but may increase the total interest paid over time.
For a separate estimate of your loan repayment schedule, use our mortgage repayment calculator.
Estimate Rent on the Remaining Share
You usually pay rent to the housing provider on the part of the property you have not purchased. This calculator estimates rent by applying your entered annual rent rate to the value of the unowned share, then dividing that amount by 12.
Your actual rent may depend on the terms of your lease and any permitted annual rent increases, so check your housing provider’s figures before making a decision.
Understand the Total Monthly Housing Cost
The calculator adds the estimated monthly mortgage repayment and rent to produce a combined monthly figure. However, this is not the full cost of living in a shared ownership property. Service charges, estate charges, buildings insurance where applicable, utilities, council tax, maintenance, and other housing expenses may increase your monthly budget. Include these separately when assessing affordability.
Check Affordability Before You Buy
Before choosing a share, compare the estimated monthly cost with your income, savings, and other commitments. Your affordability assessment should include both the mortgage and rent, along with service charges and other household expenses.
You can also use our mortgage affordability calculator to explore what you may be able to afford.
Disclaimer: This calculator provides estimates for informational and educational purposes only, not financial, tax, legal, or professional advice. Results are based on the information entered and may differ from actual costs, payments, rates, fees, or eligibility. Verify details with the relevant lender, financial professional, or official source before making financial decisions.
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Disclaimer
MortgageRatesChecker provides educational mortgage calculators, loan tools, and financial guides designed to help you better understand home financing. Our content is researched, fact-checked, and regularly updated in accordance with our Editorial Policy, using trusted information from our Data Sources and transparent methodologies explained in How We Calculate. Learn more about our commitment to accuracy on Why Trust Us. This content is provided for informational purposes only and should not be considered financial, legal, tax, investment, or mortgage advice. Mortgage rates, lending requirements, loan programs, and regulations may change without notice. Before making any borrowing, refinancing, or home-buying decision, consult your Bank or Mortgage Lender, licensed financial advisor, tax professional, or attorney based on your individual circumstances. MortgageRatesChecker is an independent educational resource and is not a lender, mortgage broker, financial advisor, or government agency. Please review our Affiliate Disclosure, Advertiser Disclosure, Disclaimer, and Terms & Conditions for additional information.
