Key Takeaway

An offset account is a transaction or savings account linked to your Australian home loan that reduces the interest you pay by offsetting your loan balance. Every dollar in your offset account reduces the amount on which you pay interest, potentially saving you thousands over the life of your loan. Offset accounts typically pair with variable-rate home loans and are offered by most major Australian lenders.

What Is a Mortgage Offset Account?

A mortgage offset account is a bank account linked to your home loan. The balance in this account is subtracted from your outstanding loan balance when your lender calculates interest charges. If you have a home loan of A$400,000 and A$20,000 in your offset account, you pay interest on only A$380,000.

According to ASIC MoneySmart, offset accounts are one of the most effective tools for reducing home loan interest over time (MoneySmart, 2026). Unlike making extra repayments, the money in your offset account remains accessible, giving you flexibility while still reducing interest.

Offset accounts are typically available with variable-rate home loans. Fixed-rate loans rarely offer offset facilities, and when they do, the offset may be partial (for example, 40 per cent offset rather than 100 per cent).

What You Will Learn

In this guide, you will learn how offset accounts work, how to set one up with an Australian lender, practical strategies to maximise your interest savings, common mistakes borrowers make, and frequently asked questions about offset accounts and comparison rates.

How a Mortgage Offset Account Works

When your lender calculates your monthly interest charge, they use your loan balance minus your offset account balance. Interest on Australian home loans is calculated daily and charged monthly, so every day your offset account holds funds, you save on interest.

Example Calculation

  • Home loan balance: A$500,000
  • Offset account balance: A$30,000
  • Interest rate: 6.00 per cent per annum variable
  • Interest calculated on: A$470,000 (A$500,000 minus A$30,000)

Without the offset account, your annual interest would be approximately A$30,000. With the A$30,000 offset, your annual interest drops to approximately A$28,200, saving you A$1,800 per year. Over a 30-year loan, this can amount to tens of thousands of dollars in savings and years off your loan term if you maintain your original repayment amount.

Your offset account can be used as an everyday transaction account. You can deposit your salary, pay bills, and make withdrawals. The balance fluctuates, and so does the interest offset, which is why keeping a higher average balance produces the greatest benefit.

How to Set Up an Offset Account

Step 1: Check Loan Eligibility

Confirm your home loan supports an offset account. Most variable-rate loans from major Australian lenders (Commonwealth Bank, Westpac, NAB, ANZ) and many smaller lenders offer offset accounts. Fixed-rate loans typically do not, or offer only partial offset.

Review your loan contract or contact your lender. If your current loan does not offer an offset account, you may need to refinance to a loan product that does.

Step 2: Apply for the Offset Account

If your loan package includes an offset account, request activation through your lender’s online banking portal, mobile app, or by contacting their home loan team. Some lenders automatically open an offset account when you settle your home loan, others require a separate application.

There may be an annual fee (commonly A$200 to A$395) for offset account facilities. Compare this fee against your expected interest savings. If you plan to keep a substantial balance in the offset account, the savings will outweigh the fee.

Redirect your salary, wages, and other regular income into the offset account. Set up automatic bill payments and direct debits from the offset account so it functions as your primary transaction account. The longer funds sit in the account each month, the greater the interest offset.

Step 4: Monitor Your Savings

Check your home loan statement each month. Most Australian lenders show the interest charged and the offset benefit separately. This transparency helps you track how much you are saving.

Tips for Maximising Your Offset Account

Maintain a high average balance. Deposit all income into the offset account and pay expenses from it. Even if your balance drops near payday, keeping a higher average balance over the month maximises your offset benefit.

Avoid keeping surplus cash elsewhere. If you have savings in a separate account earning 3 per cent interest (taxable), but your home loan rate is 6 per cent, you are better off putting that cash into the offset account. The effective return is your loan rate (6 per cent), and the benefit is tax-free because you are reducing an expense, not earning income.

Use it for your emergency fund. An offset account keeps your emergency savings accessible while reducing your loan interest. You do not lose liquidity, unlike with extra repayments on a loan without redraw.

Read also: Mortgage Offset Accounts in Australia: How They Work and How Much You Can Save

Consider multiple offset accounts. Some lenders allow you to link more than one offset account to the same loan. You can use separate accounts for different savings goals (emergency fund, holiday savings, tax reserves) and still offset your entire combined balance against the loan.

Review your loan fees. If your offset account has an annual fee, calculate your break-even point. If your average offset balance is A$10,000 and your interest rate is 6 per cent, you save approximately A$600 per year, easily covering a A$300 annual fee.

Common Mistakes to Avoid

Choosing a loan with a partial offset. Some loan products offer only partial offset (for example, 40 per cent of your account balance offsets the loan). Confirm you have a 100 per cent offset account to maximise the benefit.

Paying a high interest rate for the offset feature. Some lenders charge a higher interest rate on loans with offset accounts (for example, 6.20 per cent with offset versus 5.90 per cent without). Calculate whether the offset savings justify the higher rate. If your average offset balance is low, you may be worse off.

Confusing offset with redraw. An offset account is separate from your loan account and remains fully accessible. A redraw facility allows you to withdraw extra repayments you have made on the loan itself, but access may be restricted and some lenders charge redraw fees. Offset accounts offer simpler, fee-free access.

Not using the account actively. If your offset account sits empty or holds only a small balance, you pay the account fee but receive minimal benefit. To justify the cost, use it as your primary transaction account.

Ignoring tax implications. Interest saved through an offset account is tax-free (you are reducing a non-deductible expense). Interest earned in a regular savings account is taxable income. For investment properties, however, reducing your interest expense through offset may reduce your tax deductions, so consider your strategy with a qualified tax professional.

Frequently Asked Questions

Does an offset account work with a fixed-rate loan?

Most fixed-rate home loans in Australia do not offer offset accounts. A small number of lenders offer partial offset on fixed loans, but 100 per cent offset is rare. If offset is a priority, choose a variable-rate loan or a split loan (part variable with offset, part fixed).

Is the money in my offset account protected?

Yes. Offset accounts are standard bank accounts and are covered by the Australian Government’s Financial Claims Scheme up to A$250,000 per account holder per authorised deposit-taking institution (ADI), as regulated by APRA.

How does an offset account affect my comparison rate?

The comparison rate is a tool mandated by Australian lending law to show the true cost of a loan, including most fees and charges. It does not reflect the benefit of an offset account because the comparison rate calculation assumes a set repayment schedule without offsets. Always calculate your own scenarios to understand the real benefit.

Conclusion

A mortgage offset account is a powerful tool for Australian borrowers with variable-rate home loans. By depositing your everyday funds into the account, you reduce the interest you pay without losing access to your money. Set up your offset account through your lender, use it as your primary transaction account, and monitor your monthly statements to track your savings. For personalised advice on whether an offset account suits your circumstances, consult a licensed mortgage broker or lender.

General Advice Warning: This information is general in nature and does not consider your objectives, financial situation, or needs. It is not personalised financial or lending advice. You should consider obtaining advice from a licensed financial professional or mortgage broker before acting on this information. Interest rates, fees, loan features, and eligibility vary by lender and change frequently. Verify current terms with a licensed lender or broker for your personal situation. As of July 2026, advertised rates differ from the comparison rate, which includes most fees and charges.