Extra repayments beyond the minimum scheduled amount reduce your principal faster, which reduces both total interest and payoff time, but only if your specific product actually allows it. Whether, and how much, you can pay ahead depends entirely on the loan.
Why the effect compounds
On most variable loans, extra repayments are unlimited, and the benefit compounds over time: because less interest accrues on a lower balance, more of each future scheduled repayment goes toward principal rather than interest, which accelerates the payoff further the longer you keep it up.
The fixed-loan trap
Fixed-rate loans usually cap extra repayments at a set dollar figure per year, often expressed as a percentage of the original balance, but this varies by lender. Going over that cap doesn’t just forgo the benefit; it can trigger a break cost, even if you’re not otherwise exiting the loan. Check your specific product’s cap before assuming you can pay ahead freely on a fixed loan.
A worked example
On a $500,000 loan at 6.00% over 25 years, an extra $200 a month can meaningfully cut both the payoff time and total interest paid, the exact figures depend on your rate and term, so run your own numbers through the calculator below rather than relying on a rule of thumb.
What to prepare
- Check whether your product has an extra-repayment cap, particularly if any portion is fixed
- Confirm whether extra repayments remain accessible via redraw
- Decide on a sustainable regular amount rather than an occasional lump sum you might not maintain
Next step: model your own extra repayments in the Calculator Lab‘s Extra Repayments tool to see the time and interest saved.