What this calculator does

This calculator gives a broad property budget estimate from income, deposit and existing monthly debt commitments. It is for planning before lender-specific affordability checks.

Formula used

Estimated mortgage equals household income multiplied by the income multiple, reduced by a simple debt adjustment. Property budget equals estimated mortgage plus deposit. The stress-test payment uses the selected rate and term.

How to read the result

Use this to compare rough scenarios, not as a mortgage offer. Lenders can assess income type, credit history, dependants, spending, commitments and local rules differently.

Assumptions

  • Uses a simple income multiple model.
  • Monthly debts are converted into a broad annual adjustment.
  • Does not include taxes, fees, insurance, service charges or lender policy rules.

Sources and checks

This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.

Frequently asked questions

Is the income multiple guaranteed?

No. It is only a planning input. A lender may use a lower or higher effective limit depending on the application and rules at the time.