Simple hacks to cut interest with offset accounts

An offset account reduces the interest you pay on your home loan by using the balance in a linked transaction account to offset the amount charged each month.

If you have a $500,000 variable rate home loan and $30,000 in your offset account, you pay interest only on the remaining $470,000. The full loan balance stays at $500,000, but the daily interest calculation treats the offset balance as a deduction. Your offset account operates like a regular transaction account where you can deposit your salary, pay bills, and withdraw funds whenever needed.

How offset accounts are calculated and applied

Interest on your home loan is calculated daily and charged monthly. Each day, the lender takes the current balance in your linked offset account and subtracts it from your loan balance to determine the amount on which interest is charged. At the end of the month, the total daily interest charges are added to your loan.

Consider a scenario where you have a $450,000 variable rate loan and receive a $6,000 monthly salary. If you deposit your full salary into the offset account on the first of the month and draw it down gradually for expenses throughout the month, you reduce the daily loan balance subject to interest. Even though the average balance across the month might only be $3,000, the higher balance at the start of the month delivers measurable interest savings. Over a year, those savings compound.

Offset accounts on variable versus fixed rate loans

Most offset accounts are available only on variable rate portions of a home loan. Fixed rate loans rarely include full offset functionality, though some lenders offer partial offset arrangements or redraw facilities as an alternative. A split loan allows you to attach an offset account to the variable portion while keeping the fixed portion separate, combining rate certainty with interest reduction flexibility.

If you are comparing loan products, confirm whether the offset is a 100 per cent offset or a partial offset. A 100 per cent offset means every dollar in the account reduces your loan balance for interest calculation purposes by the full dollar. A partial offset might only offset 40 to 60 per cent of the balance. Most major lenders in Australia offer 100 per cent offset accounts on variable rate owner-occupied and investment loans.

Using offset accounts for investment property loans

Investment property loans often include offset accounts, and the structure matters for tax purposes. Interest paid on an investment loan is generally tax deductible, and funds sitting in an offset account reduce that interest without affecting the deductibility of the loan.

When you hold both an owner-occupied loan and an investment loan, directing surplus cash into the offset account linked to the non-deductible owner-occupied loan typically delivers a better after-tax outcome. You pay down non-deductible interest faster while keeping the investment loan balance and its associated tax deductions intact. In our experience, borrowers with multiple properties often direct rental income into the offset on the owner-occupied loan rather than the investment loan for this reason.

Offset versus redraw: why the distinction matters

An offset account is separate from your loan, while a redraw facility allows you to withdraw extra repayments made directly into the loan account. Both reduce interest, but they are not the same.

Funds in an offset account remain your accessible cash and can be moved or withdrawn without lender approval. Redraw funds are technically extra repayments, and while many lenders allow redraw access, some impose restrictions during hardship, restructure, or if your loan falls into arrears. For borrowers using equity to fund construction or who may need liquidity during a build, an offset account provides more reliable access to funds. If you are using home equity to build a granny flat or funding through a construction loan, keeping your buffer in an offset rather than as extra repayments preserves flexibility.

Fees, eligibility and loan packaging

Offset accounts are commonly included in home loan packages offered by banks and some non-bank lenders. Annual package fees typically range from $300 to $400 and may include other features such as fee waivers on credit cards or transaction accounts. Not all lenders offer offset accounts, and non-bank lenders in particular may not include them as standard.

When applying for a home loan or refinancing, confirm whether the offset account is included without additional cost or whether it requires a package upgrade. Some lenders charge a separate monthly fee for the offset facility itself. Weigh the fee against the potential interest saving based on the balance you expect to hold in the account. If you maintain a low balance, the fee may exceed the saving.

Structuring multiple offset accounts for different purposes

Some lenders allow you to link more than one offset account to a single loan, or split your loan into multiple accounts each with its own offset. This can be useful for separating household expenses, rental income, or savings for specific purposes such as renovations or a future deposit.

If you hold investment properties or are managing funds for a granny flat build while living on the main property, separating income streams into dedicated offset accounts can clarify cash flow and simplify tax reporting. Each offset account balance is aggregated and applied to the linked loan balance when calculating interest, so there is no disadvantage to using multiple accounts provided no additional fees apply.

When an offset account might not suit your situation

Offset accounts work well when you have surplus cash flow or irregular deposits such as bonuses, tax refunds, or rental income. If your income and expenses are tightly matched each month and you rarely hold a positive balance, the benefit of an offset account diminishes.

Borrowers on fixed incomes, including retirees using pension or super income, may find the package fee outweighs the saving if they cannot maintain a meaningful offset balance. In these cases, a loan without an offset and with a lower interest rate or no annual fee may deliver a lower total cost. Run the numbers for your own circumstances before committing to a packaged loan.

Call one of our team or book an appointment at a time that works for you. We can compare offset options across lenders, calculate the likely saving based on your deposit patterns, and structure your loan to match how you manage money day to day.

Frequently Asked Questions