Home loan repayment calculator
Enter your loan amount, interest rate and term to estimate repayments. Add an offset balance or extra repayments to see how many years you could cut off — and toggle the APRA +3% stress test to pressure-check your budget.
General information only — not personal financial advice. Read the full disclaimer.
Assumptions
- Base repayment uses the standard closed-form principal-and-interest formula (same as MoneySmart). The APRA +3% stress test recomputes that same formula at the contracted rate plus the regulator's mandated serviceability buffer.
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When you add an offset balance, extra repayments, an interest-only period or a monthly fee, we
switch to a period-by-period simulation. Interest each period is charged on
max(balance − offset, 0). This is not a full daily-interest simulation — the gap vs Figura on the baseline case is ~$10/month on a $4,600 repayment. - After an interest-only period ends, the P&I repayment is recomputed against the balance at that moment over the remaining term — matching what lenders actually do.
- Fortnightly and weekly repayments use the honest 26- and 52-period split of the monthly amount. We do not use the “half-monthly × 26” trick that inflates apparent savings.
- Fixed interest rate for the full term. “Years saved” and “Interest saved” are computed against a baseline with offset and extras zeroed.