Shared Ownership Mortgage Affordability

Check if you can afford shared ownership — mortgage on your share plus rent on unsold share.

Last updated: April 2026 · Source: GOV.UK — Shared Ownership scheme

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Affordable! Mortgage within 4.5x income

Total Monthly Cost

£890.81

Mortgage: £375.19 + Rent: £515.63

Your Share

£75,000.00

Mortgage

£67,500.00

Unsold Share

£225,000.00

Monthly Rent

£515.63

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

Shared ownership affordability is assessed differently from standard mortgages. Lenders consider your mortgage payment on the purchased share plus the rent on the unowned share plus service charges. The total housing cost typically must not exceed 45% of your gross household income. Your mortgage is usually capped at 4-4.5 times your income.

To find the maximum property price, the calculator works backwards from your income: it calculates the maximum mortgage you can get, adds your deposit, then determines what share percentage this represents at different property prices while keeping total monthly costs within the 45% limit.

Eligibility requires a household income below £80,000 (£90,000 in London). You must be a first-time buyer, a previous homeowner who cannot afford to buy now, or an existing shared owner. This calculator shows the maximum property value and share percentage you can afford.

Example: Household income £45,000, £15,000 savings

  1. Maximum mortgage (4.5× income): £202,500
  2. Deposit: £15,000
  3. Maximum share purchase: £217,500
  4. At 50% share: maximum property value = £435,000
  5. Monthly costs at £350,000 property, 50% share: approx. £1,250 — 33% of income

Source: GOV.UK — Shared Ownership scheme

Frequently Asked Questions

What does the Shared Ownership Mortgage Affordability do?
Check if you can afford shared ownership — mortgage on your share plus rent on unsold share. All calculations are performed in your browser using official UK rates and thresholds.
Is this based on current interest rates?
You can enter any interest rate to model different scenarios. Check the Bank of England base rate and current mortgage deals from lenders for the latest rates.
Should I get professional advice?
This calculator provides estimates for guidance only. For a formal mortgage offer, speak to a mortgage broker or lender who can assess your full circumstances and provide personalised advice.