TL;DR — Key takeaways
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Most homeowners know extra repayments are a good idea. But very few have actually run the numbers to see what a difference they make. The result, when you see it, tends to be motivating.
On a $500,000 loan at 6.5% over 30 years, adding just $500 a month in extra repayments saves more than $133,000 in interest and cuts nearly seven years off your loan. That’s not a rounding error. That’s a real shift in your financial position — and it comes from a relatively small change to your monthly budget.
Use Rateseeker’s extra repayments calculator to run your own numbers. This guide explains how it works, what affects your savings, and what to check before you start paying more.
Why extra repayments save so much interest
Home loan interest is calculated daily on your outstanding principal. Every dollar you pay above the minimum reduces that principal immediately — which means less interest accrues from that day forward. The effect is compounding. The earlier you start, the more you save.
This is why the ASIC MoneySmart mortgage calculator consistently shows extra repayments delivering outsized savings — particularly in the first decade of a loan when your principal is at its highest and interest makes up the bulk of each repayment.
Worked example: $500,000 loan at 6.50% over 30 years
| No extra repayments | Loan term: 30 years | Total interest: ~$640,000 |
| +$200/month extra | Save ~$62,000 interest | Pay off ~3.5 yrs sooner |
| +$500/month extra | Save ~$133,000 interest | Pay off ~7 yrs sooner |
| +$1,000/month extra | Save ~$195,000 interest | Pay off ~11 yrs sooner |
Figures are indicative. Run your own loan details through Rateseeker’s extra repayments calculator for an exact result.
Repayment frequency: weekly, fortnightly, or monthly?
The frequency of your repayments matters more than most borrowers realise. Here’s why: a year has 52 weeks and 26 fortnights, but only 12 months. If you pay fortnightly, you make 26 half-monthly payments per year — which equals 13 full monthly payments, not 12. That one extra payment per year adds up significantly over a 30-year loan.
Confirm with your lender that fortnightly or weekly repayments are available on your loan. Some lenders only offer monthly repayments on certain products. Use Rateseeker’s home loan repayment calculator to compare the impact of different frequencies on your specific loan.
Extra repayments vs offset account: which is better?
Both save interest. The difference is flexibility.
Extra repayments reduce your loan principal directly. Once paid, that money is part of the loan and can typically only be accessed via redraw — and some lenders restrict or charge a fee for redraw. The interest saving is immediate and certain.
An offset account is a separate transaction account linked to your loan. The balance offsets your principal for interest calculation purposes daily — but you can withdraw freely. It provides the same interest benefit with full liquidity. Use Rateseeker’s offset account calculator to compare your options.
If you have no immediate need to access the funds, extra repayments are straightforward and effective. If you value flexibility — for emergencies, renovations, or cash flow management — an offset account is worth comparing. A broker can help you decide which suits your situation.
Fixed rate vs variable: what’s allowed?
Variable rate loans almost always allow unlimited extra repayments without penalty. Fixed rate loans are different. Most fixed products cap extra repayments — typically at $10,000 to $20,000 per year — and may charge a break fee if you exceed the cap or pay the loan off early during the fixed period.
The Australian Banking Association outlines what lenders are required to disclose about break costs and repayment restrictions. Before making significant extra repayments on a fixed loan, check your loan contract or call your lender. The fee can be substantial — sometimes thousands of dollars — and it can wipe out the interest saving you were aiming for.
See how much you could save. Enter your loan details and extra repayment amount. Get the exact years saved and interest reduction instantly. |
Frequently asked questions
The savings depend on your loan amount, interest rate, and how much extra you pay. Even modest extra repayments of $200 to $500 per month can cut several years off a 30-year loan and save tens of thousands in interest. Use Rateseeker’s extra repayments calculator to see the exact impact on your loan.
It depends on your lender and loan terms. Many fixed rate loans cap extra repayments — often at $10,000 to $20,000 per year — and may charge a break fee for exceeding the limit. Variable rate loans typically allow unlimited extra repayments without penalty. Check your loan contract or speak to a mortgage broker before making large additional payments.
Yes, in most cases. Paying fortnightly means 26 payments per year rather than 12 monthly payments — equivalent to making 13 monthly payments instead of 12. This reduces your principal faster and saves interest over the life of the loan. Confirm with your lender that fortnightly payments are available on your loan.
Extra repayments reduce your loan principal directly — once paid, the money is part of the loan and typically only accessible via redraw. An offset account is a separate transaction account where your balance reduces the interest-bearing principal daily, but you can withdraw freely. Both save interest; the right choice depends on how much flexibility you need.