Mortgages

Mortgage Affordability Calculator

Mortgage affordability is not one universal number. Lenders use their own affordability models, so this tool deliberately shows two different constraints rather than pretending to reproduce a lender decision.

Free calculatorInputs saved only in this browser

Household position

Start with household income and commitments.

£
£
Enter 0 for a sole application.
£/month
Loans, car finance and other contractual debt payments.
£
Deposit available for the property purchase, excluding other moving costs.

Affordability assumptions

Choose the assumptions you want to pressure-test.

×
A simple gross-income borrowing ceiling for comparison.
%
Maximum stressed mortgage payment as a share of gross monthly income.
%
Rate used to convert the monthly payment cap into an indicative principal.
years

Your estimate

Use the result as a planning guide and change inputs to test the assumptions that matter most.

How this calculator works

The calculator compares an income-multiple ceiling with a payment-cap stress test. The more conservative result is highlighted as the cautious estimate. Your deposit is then added to show an indicative property budget.

How to use it

  1. Enter gross household income.
  2. Add fixed monthly debt commitments and your available deposit.
  3. Choose the income multiple you want to test.
  4. Set a maximum share of gross monthly income for the stressed mortgage payment.
  5. Set the stress rate and mortgage term.

Assumptions and limitations

This is not a lender decision in principle. Actual lenders assess expenditure, dependants, credit commitments, income type, term, loan-to-value and their own stress rules.