How to Use a Home Loan Offset Account to Save on Mortgage Interest in Australia

A home loan offset account is one of the most powerful tools Australian homeowners can use to reduce mortgage interest and pay off their loan faster. By linking a transaction account to your home loan, you can use your savings to offset the loan balance on which interest is calculated—potentially saving tens of thousands of dollars over the life of the loan. In this comprehensive guide, we’ll explain exactly how offset accounts work, compare features across major Australian lenders, and provide practical tips to maximize your savings.


What Is a Mortgage Offset Account?

A mortgage offset account is a transaction account linked to your home loan. The balance in this account is offset daily against your outstanding loan principal, reducing the amount of interest you pay. For example, if you have a $500,000 home loan and $50,000 in your offset account, you’ll only pay interest on $450,000. This can significantly shorten your loan term and lower total interest costs.

Offset accounts come in two main types:

• 100% offset account: The full balance is used to offset your loan. This is the most common type offered by major lenders.
• Partial offset account: Only a percentage of the balance (e.g., 50%) is offset against the loan. These are less common and typically found in basic loan products.

It’s important to distinguish an offset account from a redraw facility. While both can reduce interest, a redraw allows you to withdraw extra repayments you’ve made, whereas an offset account keeps your money separate and accessible at any time without affecting your loan balance. For many borrowers, an offset account provides greater flexibility and tax efficiency, especially for investors.

How an Offset Account Saves You Money

The magic of an offset account lies in the way interest is calculated. Australian home loans typically calculate interest daily and charge it monthly. By keeping your savings in the offset account, you reduce the daily balance subject to interest. Because the savings are not considered income, the benefit is tax-free—unlike earning interest in a regular savings account, which is taxable.

Let’s look at a practical example. Assume a $600,000 home loan with a 30-year term and a variable interest rate of 6.00% p.a. If you maintain an average offset balance of $40,000, you would save approximately $173,000 in interest and pay off the loan 5 years and 5 months earlier. The table below illustrates the impact of different offset balances:

Calculations based on a $600,000 loan at 6.00% p.a. over 30 years, with interest calculated daily and charged monthly. Savings are approximate and depend on actual offset balance over time.

Even a modest offset balance can yield substantial savings. The key is to keep as much money as possible in the offset account for as long as possible. This is why many borrowers use their offset account as their primary transaction account, depositing salary and savings while using credit cards for daily expenses (paying them off in full each month to avoid interest).

Comparing Offset Account Features Across Major Australian Lenders

Most major Australian lenders offer offset accounts, but features, fees, and interest rates vary. Below is a comparison of offset account offerings from four major banks—Commonwealth Bank, Westpac, ANZ, and NAB—as well as some popular non-bank lenders. Data is current as of early 2025.

Major Bank Offset Accounts

Rates and fees are indicative for owner-occupier, principal and interest loans with LVR ≤80%. Package fees may be waived for the first year. Always check current rates and conditions.

Non-Bank and Online Lender Offset Accounts

Non-bank lenders often provide competitive rates with lower fees. Here’s a snapshot of some popular options:

Rates are for owner-occupier, P&I loans with LVR ≤80%. Some lenders may require a minimum deposit or have other eligibility criteria.

When comparing offset accounts, consider not just the interest rate but also the fees. A package loan with a slightly higher rate but an offset account might still be cheaper overall if you maintain a high offset balance. Use a mortgage calculator to model different scenarios.

Practical Tips to Maximize Savings with an Offset Account

To get the most out of your offset account, you need a disciplined strategy. Here are some proven tips:

1. Use your offset as your main transaction account: Have your salary credited directly into the offset account. The longer money sits there, the more interest you save.
2. Consolidate your savings: Instead of keeping cash in multiple low-interest savings accounts, pool your emergency fund, holiday savings, and everyday cash into the offset.
3. Use a credit card for daily expenses: By paying for groceries, bills, and other costs with a credit card and paying it off in full each month from your offset account, you keep your offset balance high for most of the month. Be disciplined to avoid interest charges.
4. Park lump sums: Tax refunds, bonuses, or inheritance money should go straight into the offset. Even short-term deposits can make a difference.
5. Avoid withdrawing unnecessarily: Every dollar you take out increases your interest cost. Treat the offset like a one-way street—deposit as much as you can and withdraw only when essential.
6. Review your loan regularly: Lenders often reserve their best rates for new customers. If your current lender’s rate is uncompetitive, consider refinancing. Ensure any new loan has an offset facility that meets your needs.

For property investors, an offset account can be particularly tax-effective. By keeping rental income and savings in an offset account against an investment loan, you reduce the interest charged while maintaining the loan principal at a higher level. This can maximize tax-deductible interest when you eventually redraw for personal use. Always consult a tax professional for advice tailored to your situation.

Potential Drawbacks and Considerations

While offset accounts are beneficial, they aren’t for everyone. Here are some factors to weigh:

• Higher interest rates or fees: Loans with offset accounts often come with package fees or slightly higher rates. If you can’t maintain a meaningful offset balance, the costs may outweigh the benefits.
• Discipline required: Easy access to your savings might tempt you to spend. If you struggle with budgeting, a basic loan with a redraw facility might be safer.
• Not all offsets are equal: Some lenders cap the offset amount, charge transaction fees, or offer only partial offset. Read the fine print.
• Offset vs. redraw tax implications: For investment properties, using a redraw facility instead of an offset could contaminate the loan purpose for tax purposes. Offset accounts preserve the original loan structure.

Before choosing an offset account, calculate your break-even point. For example, if a package loan costs $395 per year more than a basic loan, you need an average offset balance of about $6,600 at a 6% interest rate to break even. Anything above that is pure savings.

How to Open and Manage an Offset Account

Setting up an offset account is straightforward:

1. Check your current loan: If you already have a home loan, ask your lender if an offset facility is available. You may be able to add it for a fee or switch to a different product.
2. Apply for a new loan with offset: When shopping for a new loan, filter for products with 100% offset. Use comparison websites or consult a mortgage broker to find the best deal.
3. Link your accounts: Once approved, your offset account will be linked to your loan. You’ll receive a debit card and online banking access.
4. Set up direct deposits: Arrange for your salary and other income to be deposited into the offset account.
5. Monitor regularly: Keep an eye on your loan balance and interest charges. Most lenders show the impact of your offset balance in their app or online portal.

Remember, an offset account is most effective when used consistently over the long term. Even small balances add up over time.

FAQ

Is an offset account better than making extra repayments?

Both strategies reduce interest, but an offset account offers more flexibility. Extra repayments are locked into the loan (accessible only via redraw, which may have conditions), while offset funds remain liquid. For investors, offset accounts preserve tax-deductibility of the loan.

Can I have multiple offset accounts?

Most lenders allow only one offset account per loan, but some (like AMP and Macquarie) offer multiple offset accounts. Check with your lender.

Do offset accounts work with fixed-rate loans?

Typically, offset accounts are only available with variable-rate loans. Some lenders offer partial offset on fixed loans, but it’s rare. If you fix your rate, you usually lose the offset benefit.

How much can I really save with an offset account?

Savings depend on your loan size, interest rate, and offset balance. Use the table in this article or an online calculator to estimate your personal savings. Even a $10,000 balance can save over $40,000 in interest on a typical 30-year loan.

Are offset accounts worth the fees?

If you can maintain a high enough offset balance, the interest savings usually exceed any package fees. Calculate your break-even point before deciding.

References

1. Commonwealth Bank – Home Loan Offset Accounts: https://www.commbank.com.au/home-loans/offset.html (accessed 2025)
2. Westpac – Premier Advantage Package: https://www.westpac.com.au/personal-banking/home-loans/package/ (accessed 2025)
3. ANZ – Breakfree Package: https://www.anz.com.au/personal/home-loans/package/ (accessed 2025)
4. MoneySmart – Offset Accounts Explained: https://moneysmart.gov.au/home-loans/offset-accounts (2025)
5. Athena Home Loans – Straight Up Offset: https://www.athena.com.au/home-loans/straight-up (accessed 2025)