Calculate∑ What your result means
UK mortgage lenders typically cap how much they'll lend as a multiple of your income, then reduce that further to account for existing debt commitments.
UK Mortgage Affordability Calculator
Estimate the maximum property price you could afford based on typical lender income multiples.
Your details
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Verified for 2026-27Methodology 2026-27.1 · reviewed 2026-08-08 · review by 2027-03-01
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Compare scenarios
Change annual gross household income to see the effect on your result.
Understand your result
Clear context for the values above.
Annual gross household income
Annual gross household income is included so you can interpret this estimate and make a better-informed comparison.
Annual existing debt repayments
Annual existing debt repayments is included so you can interpret this estimate and make a better-informed comparison.
Deposit available
Deposit available is included so you can interpret this estimate and make a better-informed comparison.
Estimated maximum property price
Estimated maximum property price is included so you can interpret this estimate and make a better-informed comparison.
How to use this calculator
- 1Enter your current annual gross household income, annual existing debt repayments, deposit available.
- 2Review the headline estimated maximum property price and the supporting figures beside it.
- 3Change one input at a time to see which assumption has the biggest effect.
- 4Confirm current UK rates and thresholds with an official source before acting.
Explore this calculator
What your result means →The headline estimated maximum property price is based on the inputs currently shown above.Key terms explained →Review the assumptions, applicable rules, timing and real-world fees before making a decision.How to use this calculator →Enter your figures, review the live result, compare scenarios, then save or print your estimate.The calculation formula →The calculation follows the standard relationship between the displayed inputs. Results update whenever an input changes.Worked example →Using the current values produces £323,422.Assumptions and limitations →Review the assumptions, applicable rules, timing and real-world fees before making a decision.Costs or factors not included →Review the assumptions, applicable rules, timing and real-world fees before making a decision.Frequently asked questions →How accurate is this estimate? What should I check before relying on it? Can I save or share the result?
▦ How this calculator works
The calculator caps your loan at a commonly used 4.5× income multiple, then applies a simplified affordability stress test: it checks whether the mortgage payment on that loan size — calculated at a stressed rate well above typical fixed-rate deals — plus your existing debt repayments would still fit within roughly 45% of your gross income, and uses whichever cap is lower before adding your deposit to estimate a maximum purchase price.
◇ Assumptions and what's not included
Actual lending is based on a full affordability assessment including your outgoings, credit history, number of dependents, mortgage term, interest rate stress tests and the lender's own risk appetite — actual offers can be higher or lower than this estimate.
▤ What to do next
Use this for an early ballpark figure, then get a mortgage agreement in principle from a lender or broker for a number you can actually rely on when house-hunting.
UK-specific contextFigures use GBP and current published rates and thresholds.
Reviewed for clarityUpdated 3 August 2026.
ImportantFor planning and educational use — not tax, legal or financial advice.
Your privacy mattersInputs stay in your browser.
Frequently asked questions
Is 4.5× income the same for every lender?+
No, income multiples vary by lender and can be higher for certain professions or higher earners, or lower if you have a smaller deposit or more debt.
Does this include stamp duty in the affordability figure?+
No, stamp duty and other buying costs are separate — use the SDLT calculator alongside this one to budget for the full purchase cost.
What counts as household income?+
For a joint mortgage, most lenders combine both applicants' gross income, though some apply different multiples to a second income — enter your combined figure here.
Why does existing debt reduce my borrowing power so much?+
Lenders must ensure you can afford repayments alongside existing commitments, so committed debt repayments reduce the income available to service a mortgage.
Official references
Rules and thresholds used by this calculator are labelled for 2026–27 or formula-labelled period. Review the primary guidance before making a filing, borrowing, benefit or investment decision.
Last source review: 3 August 2026. Calculator results are estimates and may exclude circumstances described in the methodology.