Shared Ownership Calculator
Work out your monthly costs for a shared ownership property, including mortgage and rent payments.
Property details
Monthly rent on unowned share
Calculated at 2.75%/yr of unowned share (£225,000) = £515.63/month
Total monthly housing cost
£876.92
Mortgage + rent combined
Monthly mortgage
£361.29
25-year term
Monthly rent
£515.63
On 75% unowned share
Your 25% share
Comparison: buying 100% with same deposit
Monthly repayment on £290,000 mortgage
£1,611.91
Shared ownership saves you £735.00/month compared to buying the full property — but you own only 25%.
Note: Rent on the unowned share is typically 2.75% per year of its value, set by the housing association. This figure can vary — check your specific offer document for the exact rent and any annual increase terms (usually RPI or CPI + 0.5%).
What is shared ownership, and who is it for?
Shared ownership is a government-backed scheme that allows you to buy a share of a property — typically between 10% and 75% — and pay rent on the remaining share to a housing association. It is designed to help people who cannot afford to buy on the open market, including first-time buyers and those who previously owned a home but can no longer afford to do so.
Who is eligible
To qualify, your household income must generally be below £80,000 (or £90,000 in London). You must also be a first-time buyer or no longer own a home, and able to demonstrate you cannot afford to buy the full property outright. Properties must be specifically designated as shared ownership — you cannot use the scheme on any property.
Staircasing
One of the key features of shared ownership is staircasing — the ability to buy additional shares in your home over time, increasing your ownership percentage and reducing the rent you pay. Under the 2021 reforms, you can now staircase in instalments of as little as 1%. Many buyers aim to eventually staircase to 100% and own the property outright. Each staircasing transaction involves legal fees and potentially a new mortgage valuation, so the costs should be factored into your long-term planning.
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Disclaimer: This calculator is for illustrative purposes only and does not constitute financial advice. Always speak to a qualified, FCA-authorised mortgage adviser before making financial decisions.