Enter your loan balance, current rate, and income to see how your monthly repayments would change at rate increases of 1%, 2%, and 3%, and what percentage of your take-home pay would go to mortgage repayments at each scenario. The tool also shows the maximum rate rise your current income could absorb before repayments exceed a standard affordability threshold.

Why stress-test at +3%?

APRA requires banks to assess every new home loan at your actual rate plus a 3 percentage point buffer. The idea is that you should still be able to service the loan if rates rise meaningfully over the term.

What is the 30% rule?

A common benchmark: if your mortgage repayment uses more than 30% of gross household income, you are considered to be in mortgage stress. It's a rule-of-thumb, not a lender limit. Over 40% is often called severe mortgage stress.

Why use gross income, not take-home pay?

Consumer benchmarks like the 30% rule typically use gross (before-tax) household income because it's easier to compare across situations. If you'd prefer to think in take-home terms, pretend your income input is your after-tax figure and read the thresholds as tighter.

What if I'm on a fixed rate?

Fixed rates insulate you until the fixed period ends. This tool shows what happens at rollover. If you're 18 months into a 3-year fix, the +1%/+2%/+3% view is a reasonable rehearsal for refinancing at a higher rate.

Are my repayments the same every month?

The numbers here use the principal-and-interest formula over the remaining term. If you have an interest-only loan, or make extra repayments, your actual cash flow will differ.