Mortgage Affordability Calculator UK
Mortgage affordability calculator UK: see an illustrative borrowing range at 4.0×, 4.5× and 5.0× gross income, plus example repayments.
Build an indicative range
Use this to record loans, childcare, maintenance or other regular commitments for context. It is shown separately because lenders model commitments differently.
What can make the real figure lower or higher?
Income multiples are only a starting point. A lender may consider verified income, spending, dependent children, credit commitments, the property, term, deposit, loan-to-value, employment history and a future-rate stress assessment. The FCA requires lenders to account for likely future rate rises in affordability, but lenders set their own compliant methods.
- A higher income multiple is not guaranteed, even with a large deposit.
- Regular credit, childcare and maintenance commitments can reduce the amount a lender will offer.
- A longer term usually lowers the monthly payment but increases total interest.
- Use a mortgage broker or lender decision in principle before relying on a property budget.
Sources and methodology
Last checked: 2026-08-13. WizeBudget presents a range rather than asserting a universal lender formula. The range is a transparent planning illustration and does not simulate a lender’s proprietary affordability score.