Offset vs Extra Repayments: Which Saves More?

Short answer

If the dollar amount is the same and your offset sits against the full loan balance every day, an offset account and extra repayments save almost identical interest. Both reduce the balance interest is charged on. The real difference is access and flexibility: money in an offset stays available as cash, while extra repayments are locked into the loan unless your lender offers redraw. For most owner-occupiers the choice comes down to flexibility and tax rather than the headline saving.

How each one works

Australian home loans charge interest daily on your outstanding balance, then bill it monthly. Both strategies shrink that balance, just by different routes.

• Extra repayments pay money directly onto the loan principal. Your balance drops permanently, so future interest is calculated on a smaller debt. Per Moneysmart, this is one of the fastest ways to cut total interest and shorten the term.
• An offset account is a transaction account linked to your loan. Each day the lender subtracts your offset balance from your loan balance before calculating interest. You don't earn interest on the offset money; instead you avoid paying interest on an equal slice of the loan. See Moneysmart on offset accounts.

Two practical distinctions matter:

1. Access. Offset money is everyday cash you can spend or move anytime. Extra repayments are only retrievable through a redraw facility, which lenders can limit or freeze.
2. Tax (for investors). Because offset money is never technically "repaid", pulling it out for personal use doesn't change your loan's purpose, so on an investment loan the interest generally stays deductible. Redrawing extra repayments for personal spending can reduce deductibility. Always confirm with the ATO or a registered tax agent.

Offsets usually attach to variable loans and may carry a package or account fee. Extra repayments are typically free on variable loans but often capped or penalised on fixed-rate loans. Compare any fee against the interest you'd save.

Worked example

Take True Loan's standard scenario: a $600,000 loan at 6% over 30 years, paid monthly. The base repayment is about $3,597/month, and total interest over the life of the loan is roughly $695,000 if nothing extra is paid.

Now add $40,000 as either strategy:

Strategy	What happens	Approx. effect
$40,000 lump-sum extra repayment	Balance drops to $560,000 immediately; interest accrues on the lower figure	Tens of thousands less interest; loan finishes years early
$40,000 held permanently in offset	Interest charged on $560,000 each day the money stays there	Near-identical saving, while the cash stays accessible

Because 6% interest is charged on balance − offset, holding $40,000 in offset is mathematically the same as owing $40,000 less, as long as the balance stays there. There's a catch: if you dip into the offset, the saving shrinks for those days. A lump-sum extra repayment can't be accidentally spent, though it's also harder to get back. For the dollars-and-cents only, see how much an offset saves on a $600k loan.

The numbers also reveal the bigger lever: the amount you put in and how long it stays matters far more than which of the two buckets you pick.

Model this in True Loan

True Loan lets you test both. They're separate inputs, so model one at a time:

• For offset, enter your loan, rate and term, then set the Offset balance field to the amount you'd keep parked there (e.g. $40,000). True Loan accrues interest on loan-minus-offset and shows the earlier payoff.
• For extra repayments, leave offset at $0 and set Extra repayment ($/month) to your planned amount. (For a one-off, see how a $10k lump sum changes things.)

Then open True Loan Compare to run an offset scenario beside an extra-repayments scenario side by side. Watch the total interest, payoff date, and the remaining-debt timeline. Every scenario is shareable by URL, so you can save both and revisit. Whether offset reduces your repayment or your term is a key thing to check in the timeline.

Common questions and mistakes

Does an offset lower my monthly repayment? Usually no. Your scheduled repayment stays the same, but more of it goes to principal, so you finish early. Some lenders let you recalculate the repayment instead.

Is the saving really equal? Only if the offset stays full. Spend from it and you lose interest savings on those days, whereas a paid-down balance keeps saving regardless.

Partial offset accounts. Some products only offset a percentage of your balance. A 100% offset is what makes the maths match extra repayments, so check your product.

Fixed-rate loans. Many cap extra repayments and may not allow a full offset, so the comparison can differ. Check your loan's terms.

Don't double-count. In True Loan, model offset or extra repayments per scenario, not the same money in both, which overstates the saving.

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Figures here are estimates for the 2025-26 financial year and depend on your rate, balance and lender's terms. This is general information, not financial or credit advice. Check official sources like Moneysmart and the ATO, and consider advice from a licensed professional for your situation.