Mortgage Affordability Calculator

Find out how much you could borrow based on your income, expenses and deposit. Uses typical UK lender criteria.

Last updated: April 2026 · Source: FCA — Mortgages guidance

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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

UK mortgage lenders typically offer 4 to 4.5 times your annual income, though some may stretch to 5.5 times for high earners with minimal outgoings. Affordability is assessed not just on income multiples but also on your ability to meet payments if interest rates rise.

Lenders apply a stress test, checking whether you could afford payments at a rate typically 3% above the product rate (or the lender's SVR, whichever is higher). This explains why you may be offered less than the headline income multiple suggests.

Joint applications combine both applicants' incomes. Existing debts (loans, credit cards, car finance) reduce the amount you can borrow. This calculator factors in your income, deposit, existing commitments and current rates to estimate your borrowing capacity.

Example: £50,000 salary, £30,000 deposit, 4.5× multiple

  1. Maximum borrowing (4.5×): £225,000
  2. Plus deposit: £30,000
  3. Maximum property price: £255,000
  4. Stress-tested at 7.5%: monthly payment £1,789 on £225,000

Source: FCA — Mortgages guidance

Frequently Asked Questions

How much can I borrow for a mortgage in the UK?
Most UK lenders will offer 4 to 4.5 times your annual salary, though some may offer up to 5.5 times in certain circumstances. Your affordability also depends on your existing debts, monthly outgoings and credit score.
What income do lenders consider for mortgage affordability?
Lenders consider your basic salary, regular overtime, bonuses (often at a discounted rate), rental income, and other guaranteed income. Self-employed applicants typically need 2-3 years of accounts or SA302 forms.