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Mortgage Affordability

Estimate a borrowing range from your income, commitments and assumptions. Each lender makes its own affordability decision.

Borrowing power + stress test

How this is worked out

Choose an illustrative income multiple to explore a borrowing range. Eligibility and the multiple offered depend on the individual lender and your circumstances.

Monthly debt repayments are subtracted from your borrowing power — every £100/month of debt reduces your max loan by roughly £3,000 in our model (an illustrative adjustment, not a lender rule).

Mortgage payments use the standard repayment formula: P × r × (1+r)n ÷ ((1+r)n − 1), with r = monthly rate and n = months.

The higher-rate scenario uses the rate you enter. The 40% flag is a planning prompt, not an FCA rule or approval threshold. This model excludes pensions, student loans, Scottish tax and household living costs; a lender will assess more information.

Before using this estimate

A planning range, not a mortgage offer. Lenders use their own eligibility, credit, expenditure and affordability policies.

Check the source guidance

Related guides

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Educational only. Not personal financial advice. Tax-year figures may change; check periodically.

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Tax year 2026/27 · Tax and loan constants checked 16 September 2026 · Educational only, not personal financial advice