Sixteen dollars a day. That's roughly what $100,000 sitting in an offset account cancels in home loan interest at variable rates above 6 per cent, and it does the same thing again tomorrow, and the day after, for as long as the money sits there. That's an offset account on a home loan, explained in one line: your savings cancel loan interest, daily and tax-free, while staying fully available. It's the most useful loan feature most borrowers only half-use.
The timing matters more than usual. The RBA lifted the cash rate three times this year, in February, March and May 2026, taking it to 4.35%, then held in June. Rising rates cut both ways for borrowers with cash. Repayments hurt more. And offset dollars work harder, because the same balance now cancels interest at a higher rate than it did eighteen months ago.
How does an offset account work on a home loan?
An offset account is an everyday transaction account linked to your variable home loan. Your lender calculates interest daily on the loan balance minus the offset balance. Owe $500,000 with $40,000 in the offset, and you're charged interest on $460,000. The money stays yours. Salary lands in it, bills come out of it, and while it sits there, it works.
The daily calculation is the detail worth pausing on. Because interest accrues day by day, money that only passes through still counts: a $6,000 pay cycle sitting in the offset for a fortnight before the bills clear saves a small slice of interest, twelve times a year. Small slices compound. The practical move is to point your salary at the offset, run your spending from it, and let the average balance do the rest.
Two cautions. Full 100% offsets typically sit on variable loans; fixed loans often allow partial offsets or none at all. And not everything marketed as an offset is one. We've seen loans sold with an "offset" that was a redraw facility wearing a better name, and the difference only surfaced when the borrower tried to pull the money back out. The two features are cousins, not twins. The access and tax differences are big enough that we've compared them properly in offset vs redraw.
Why do rising rates make your offset work harder?
A rate hike is bad news for your repayments and a pay rise for your savings, provided those savings sit in an offset.
When your variable rate climbs from the mid-5s to above 6 per cent, each offset dollar cancels interest at the new, higher rate. A $60,000 balance that cancelled around $3,240 a year at 5.4% cancels around $3,600 at 6%. You did nothing. The rate did the work.
Compare the obvious alternative. Park that same $60,000 in a high-interest savings account paying around 5% and you'd earn $3,000, then hand the ATO its share. On a 30% marginal rate plus the 2% Medicare levy, you keep about $2,040. The offset's $3,600 is interest you were never charged, so there is nothing for the ATO to tax. To match it after tax, that savings account would need to pay roughly 8.8% before tax. No mainstream savings account in July 2026 comes anywhere near that.
The upshot before the 11 August decision: gather the scattered cash. The travel fund in one bank, the emergency fund in another, the old bonus idling in a transaction account earning 0.01%. Consolidated into the offset, all of it starts cancelling 6%-range interest from tomorrow morning.
Offset, redraw, savings or extra repayments: where should surplus cash sit?
Four common homes for spare cash, and they are not interchangeable.
| Where the cash sits | Effect on interest | Tax on the return | Getting it back |
|---|---|---|---|
| Offset account | Cancels loan interest daily on the full balance | None | Instant. It's your transaction account |
| Redraw facility | Extra repayments shrink the balance interest is charged on | None | At the lender's discretion; can be restricted |
| Extra repayments (no redraw) | Permanently reduce the principal | None | Only via a top-up or refinance, meaning a fresh credit assessment |
| Savings account | Earns interest at the savings rate | Taxed at your marginal rate | Instant |
Redraw and extra repayments match the offset on raw interest maths but cost you access, and access is the point: an emergency fund can stay an emergency fund while still cutting your interest bill. If you're weighing whether to offset or pay the loan down directly, the full comparison lives in offset vs extra repayments. And if your surplus cash is earmarked for investing rather than parking, the offset is also the launch pad for a debt recycling strategy, where the order of operations decides the tax outcome.
How much could an offset save you? Run the numbers
Kate and Dan bought in Wollongong in 2023: a $650,000 loan, 30 years, principal and interest, variable. Between an emergency fund, a work bonus and a half-forgotten term deposit, they hold $60,000 in cash spread across three banks.
They consolidate it into a 100% offset. At an illustrative 6.00% variable rate:
- Year one: about $3,600 of interest cancelled, tax-free, with the money available the whole time.
- Held at that level for the life of the loan: total interest falls from roughly $753,000 to about $515,000. That's around $237,000 less interest, and the loan finishes about five years early, without a single extra repayment.
The detail worth noticing: the money already existed. No new savings, no tighter budget, no changed repayments. The gain came entirely from where the cash sat. An offset is one of the strongest levers in paying off your home loan faster, and the only one that asks nothing of your lifestyle.
Based on typical scenarios. Individual outcomes vary. Illustrative 6.00% rate held constant for comparison as at July 2026; actual interest rates and comparison rates vary by lender and change over time.
Is an offset worth the fee, and how do you set it up well?
Offsets are rarely free. Lenders typically attach them to package loans with annual fees of around $250 to $400, or price them into a slightly higher rate. The break-even is easy to find: at 6%, a $395 annual fee is covered by an average offset balance of about $6,600. Hold less than that year-round and a no-frills loan with redraw may beat it. Hold more, and the fee is noise.
Structure decides how hard the offset works from there.
- Point income at it. Salary and any rent land in the offset; spending runs out of it. The average daily balance stays as high as possible.
- Ask about multiple offsets. Some lenders let you run several named offset buckets, bills, emergency, travel, all offsetting the same loan.
- Investors, mind the repayment type. Pairing an offset with interest-only repayments keeps cash cutting interest without permanently paying down a deductible loan; the trade-offs are covered in interest-only vs principal and interest.
Offset structure is baked into a WityLoanPlan rather than bolted on afterwards. When your loan proposal is built, the plan itself records which loan carries the offset, where salary lands and how the buckets are arranged, so the structure survives settlement instead of living in someone's memory.
And if your current loan has no genuine 100% offset, that alone can justify a refinance review. The barrier to switching is passing the new lender's assessment, not your current bank, and under specialist lending policies available through Wity, any borrower can refinance at up to 85% LVR with no LMI.
What should you do this month?
Add up the cash sitting outside your loan. If it's more than about $6,600, an offset likely pays for itself; if it's $60,000, the numbers above are yours to claim.
Want to see what an offset would do to your numbers? Start the Wity questionnaire → Free, no credit check, two minutes.