How to use it
- Enter your total loan amount in Australian dollars.
- Input the annual interest rate quoted by your lender.
- Select your loan term in years.
- Review your monthly repayment, total interest, and total payments.
Borrowing money is a long-term business decision. Most buyers fixate on the property purchase price and ignore the actual cost of the debt. This calculator strips away bank smoke screens so you can see your real obligations before signing a mortgage contract.
Enter your loan balance, interest rate, and term to generate three critical numbers: your monthly repayment, the total interest paid, and the total cash outgoing across the entire loan.
Use the monthly payment figure to pressure-test your household budget against rate rises. Look closely at the total interest: on a standard 30-year term, that number often rivals the principal itself. Comparing terms and rates here lets you see exactly how minor rate cuts or shorter amortization terms save you tens of thousands of dollars in interest. Run the numbers first so you negotiate from leverage, not hope.
Pro tips
- Stress-test your budget by testing a rate 2% higher than current bank offers to prepare for RBA rate hikes.
- Shortening your term from 30 to 25 years increases monthly repayments slightly but slashes total interest dramatically.
- Account for additional ongoing costs like council rates, strata fees, and building insurance on top of monthly debt service.
- Never assume bank comparison rates reflect your exact scenario; calculate your specific loan balance and term directly.
Real-life examples
- Comparing fixed vs. variable loan offers from Big Four and non-bank lenders.
- Deciding between a 25-year and 30-year term to balance cash flow against long-term interest costs.
- Assessing your borrowing power and affordability before bidding at an Australian property auction.
Case study
Liam was offered a $600,000 mortgage over 30 years at 6.2%. Running the calculator revealed he would pay over $720,000 in interest alone. By adjusting his budget and selecting a 25-year term at a negotiated 5.9% rate, he cut his total interest bill by more than $165,000, saving thousands each year without overstretching his monthly cash flow.