What is an offset account and how does it save me interest?
An offset account is a transaction account linked to your home loan that reduces daily interest — how it works, and the trade-offs before choosing one.
What is an offset account?
An offset account is an everyday transaction account linked to your home loan. Each day, the lender takes the balance sitting in that account and “offsets” it against your loan’s principal before working out how much interest to charge. You still own the money in the account — it isn’t locked away or paid into the loan — but the loan’s interest calculation treats it as if it had reduced what you owe.
Most offset accounts behave like a normal transaction account day to day: your salary can land there, you can spend from it with a card, and you can move money in and out whenever you like. The only difference is what it does to your loan’s daily interest calculation.
How does an offset account reduce the interest you pay?
Interest on a home loan is usually calculated daily, on the outstanding balance. An offset account changes what counts as the “outstanding balance” for that calculation:
Interest charged for the day = (loan balance − offset account balance) × the loan’s daily interest rate
The higher your offset balance relative to your loan, the smaller the figure interest is charged on. Because your regular repayment amount doesn’t change, less of it goes toward interest and more goes toward the loan’s principal — so, all else equal, the loan is paid down faster than it would be without the offset balance.
One thing an offset account does not do is reduce the loan balance shown on your statement. That distinction matters if you’re tracking your loan-to-value ratio (LVR): lenders mortgage insurance (LMI) is usually payable once you’ve borrowed more than 80% of the property’s value, and, as at July 2026, that 80% LVR benchmark is unaffected by money sitting in an offset account, because the loan balance itself hasn’t moved. Reducing LVR needs an actual reduction in what you owe.
Do all offset accounts work the same way?
No — the structure varies by lender and by loan product.
| Offset type | What it means |
|---|---|
| 100% offset | Full linked-account balance offsets the loan dollar-for-dollar |
| Partial offset | Only part of the balance, or a capped amount, reduces interest |
| No offset feature | The loan doesn’t support the feature at all |
Some loans offer a “100% offset,” where the full balance in the linked account offsets the loan dollar-for-dollar. Others offer a partial offset, cap the benefit, or only make the feature available on certain loan types, commonly variable-rate loans rather than fixed-rate ones. Any account-keeping fee, minimum-balance condition or package-fee arrangement attached to the offset feature is set out in the individual lender’s loan contract and product disclosure documents, not by a single industry standard.
What are the trade-offs of having an offset account?
An offset feature is often bundled into a home loan “package” that carries its own annual fee, or attached to a loan with a different interest rate to a basic loan without the feature. Whether the interest saved outweighs that cost depends on how much you typically keep in the account and how the specific loan is priced — a like-for-like comparison needs the actual numbers from the loan in question, not a general rule.
Some borrowers also value offset accounts because the money never becomes part of the loan. If a property might later become an investment — a consideration some first home buyers weigh early — keeping savings in an offset rather than making extra loan repayments can matter to how that loan is characterised for tax purposes. Tax outcomes depend on your circumstances — speak with a registered tax agent before acting.
Is an offset account worth it for a first home buyer?
There’s no single answer — it depends on factors specific to your loan and your habits: the size of the balance you’d realistically keep in the account, whether the loan’s package fee or rate premium (if any) is larger or smaller than the interest that balance would save, and whether you value same-day access to your savings over locking extra repayments into the loan. A licensed mortgage broker can compare specific loan products against your own numbers.
If you’re still building your deposit, see our guide to how much deposit you need for a first home in Australia for the paths available before you get to comparing loan features.
