Borrowing Power Calculator

This calculator gives you a rough idea of borrowing power. It assesses repayments at your rate plus a 3% buffer, in line with how APRA (the Australian Prudential Regulation Authority, the banking regulator) requires lenders to test serviceability. Real lender assessments are more detailed, so treat the result as a starting point and confirm with a broker.

Household take-home income (per month, after tax) Use your combined after-tax (net) pay from your payslips.

Household type Single adult Couple Sets a default living-cost baseline (HEM, the Household Expenditure Measure that lenders use).

Number of dependants Adds roughly $600 per month to the living-cost baseline per dependant.

Your estimated monthly living expenses (optional) The calculator uses your figure or the baseline, whichever is higher (as lenders do).

Existing monthly debt repayments (cards, car, personal loans)

Interest rate (% p.a.)

Loan term (years)

Estimate Borrowing Power

Understanding the result

Lenders look at far more than this calculator: your income type and stability, your actual expenses, your deposit and the resulting LVR (loan-to-value ratio, your loan as a percentage of the property value), your DTI (debt-to-income ratio), and credit history. Borrowing more than 80% of the value usually means paying LMI (lenders mortgage insurance). For a deeper explanation, read our guide on how much you can borrow, or if you are buying your first home, our guide to Perth grants and schemes. Do not forget the upfront cost of stamp duty either, you can estimate it with our WA stamp duty calculator.

This calculator and its output are general information only and are not credit advice or an offer of credit. Any loan is subject to a lender's assessment and approval. Figures and assumptions are current as at June 2026. See our disclaimer.