How Much Mortgage Can You Borrow?

This calculator uses the standard affordability multiple applied by most UK high street lenders: up to 4.5 times your annual income (or combined income for joint applications). Some specialist lenders may go up to 5 or 5.5 times income for certain professions or higher earners, but 4.5x is the most common benchmark.

Loan-to-value (LTV) is the ratio of your mortgage to the property value. A 10% deposit on a £300,000 property gives a 90% LTV mortgage of £270,000. Lenders typically reserve their best rates for borrowers with 25–40% deposits (60–75% LTV). Rates increase as LTV rises, reflecting the greater risk to the lender.

All lenders must also apply a stress test — checking that you could still afford repayments if the Bank of England base rate rose by approximately 3 percentage points above your initial rate. This is a regulatory requirement under FCA responsible lending rules and is separate from the income multiple calculation shown here.

For a fully accurate mortgage in principle, consider speaking to an independent mortgage broker or using our regional mortgage comparison pages to see current rates, or browse our mortgage guides for tips on securing the best deal.