Offset Accounts Explained — How They Work and Whether You Need One

How an offset account reduces interest

Interest on a home loan is calculated daily on the outstanding loan balance. An offset account reduces this balance for interest calculation purposes — not the actual loan balance. Each dollar in your offset saves you the home loan interest rate on that dollar rather than earning a (taxable) savings rate. For borrowers in higher tax brackets with significant savings, this can be material — individual outcomes vary.

Offset vs redraw

Both allow you to reduce your effective loan balance, but differ: Offset — separate account, typically instant access, balance reduces interest daily. Redraw — extra repayments made directly to your loan, redrawn when needed — some lenders impose conditions or delays. For savings you may need access to, an offset is generally more flexible. Individual product terms vary significantly.

100% offset vs partial offset

A 100% offset applies every dollar dollar-for-dollar against your loan. Partial offsets apply only a percentage — less effective. Most competitive offset products are 100%. Always confirm this when comparing loans.

When an offset is most valuable

Most valuable when: you maintain a high average balance; your home loan rate is high relative to savings rates; you're in a higher income tax bracket; you have irregular large cash flows (business owners, commission earners). For borrowers with minimal savings in the account, the benefit is limited. Individual circumstances vary.

Costs to consider

Some lenders charge higher rates or fees for offset-enabled loans. Compare the total cost of a loan with offset versus a lower-rate product without one. If you maintain a low offset balance, the fee may outweigh the benefit. A mortgage broker compares total cost across lenders for your specific situation.

Frequently asked questions