A useful repayment budget includes living costs, other debts, irregular expenses and the buffer you want to retain. A calculator is an illustration, not a lender assessment or a recommendation.
Look beyond a single month
Convert annual and quarterly costs into a monthly allowance. Include insurance, rates, school or childcare costs where relevant, transport and maintenance. Use your actual spending rather than a generic percentage that may not fit your household.
Test a less comfortable assumption
What would a higher rate, a temporary income reduction or an unexpected expense do to the budget? Scenario testing is not a forecast. It helps identify how much flexibility you have and where the plan may be vulnerable.
Understand the repayment calculation
A principal-and-interest calculator estimates regular payments for a balance, rate and term. The illustration on this site assumes a constant rate, monthly repayments and no fees or additional payments. Actual lender calculations, timing and product terms may differ.
Keep savings accessible in an appropriate way
Discuss the purpose of your buffer and how different loan features work. Offset accounts and redraw are not identical arrangements. Access conditions, fees and tax implications should be understood rather than treated as interchangeable.
Act early when the budget tightens
A loan review can be useful, but refinancing is not always possible or appropriate during difficulty. Contact your lender promptly to discuss support. For independent help, use the financial counselling information on Moneysmart.
Sources & further reading
Prepared 4 October 2026. General information; check current rules for your circumstances.