Why Lower Refinance Repayments Can Mean More Total Interest

Interest on a home loan is charged on the outstanding balance, usually calculated daily and added monthly. The rate sets how much interest each dollar of balance attracts; the term sets how many months that balance is still there to attract it. A lower rate on a longer term pulls those two forces in opposite directions.

The monthly repayment is the wrong number to judge a refinance on because it is designed to be low: lenders quote the minimum needed to clear the balance over the full new term. In the example the repayment drops by about 16 per cent, but the number of payments rises by about 36 per cent, from 264 to 360. Total interest is repayment multiplied by number of payments, minus the balance, so the second effect wins.

Total cost is the figure that matters: interest paid over the life of the loan plus fees. Compare that number across your options, not the repayment.

Every refinance quote hides three separate paths, and the quote sheet usually shows you only one of them.

The third path works on any loan that allows extra repayments without penalty; fixed-rate periods often cap them, so check before relying on it. You can also ask the lender to write the new loan over a shorter term that matches your remaining 22 years. That locks in the same result and removes the temptation to drift back to the minimum.

Refinancing is not free: a discharge fee from the old lender, application or settlement fees from the new one, and state mortgage registration fees. The example uses $1,200. The break-even question is how long the rate saving takes to repay those costs.

Measure it against the interest saving, not the repayment drop. In the first month of the example the rate cut reduces the interest charged by about $200 ($480,000 multiplied by 0.50 per cent, divided by 12), so $1,200 of costs is recovered in about six months. Against the $546 repayment drop it looks like two months, but most of that $546 is deferred principal, not saved interest. As a rule of thumb, a break-even under a year or two is comfortable; several years means the rate gap is too thin, especially if you expect to sell or switch again.

Cashback offers change the arithmetic, not the logic: add the cashback to the saving side, subtract every cost, and read the conditions attached.

Sometimes the longer term is the sensible choice. If the household is under real cash-flow stress, a $546 monthly drop can be the difference between keeping the home and missing repayments; a longer loan you can service beats a shorter one you cannot. If you carry higher-rate debts such as credit cards, car loans or buy-now-pay-later balances, taking the lower home loan repayment and pointing the difference at that debt saves more than paying extra on the mortgage, because those rates sit well above any home loan rate. Once the expensive debt is gone, redirect the same money back to the mortgage.

The mistake is taking the lower repayment by default, spending the difference, and treating the refinance as a saving because the monthly number went down. Decide what the freed-up cash is for before you sign.

Read the quote for these items before comparing anything. A quote that is silent on term or fees is not a complete quote; ask for the missing items in writing.