A mortgage offset account is a transaction or savings account linked to your home loan. Every dollar in the offset account reduces the loan balance on which interest is calculated, lowering your monthly repayments or helping you pay off the loan faster. Offset accounts are commonly available with variable-rate home loans in Australia and can deliver substantial interest savings if you maintain a healthy balance.

What is a Mortgage Offset Account?

A mortgage offset account is a separate bank account, either a transaction account or a savings account, that is directly linked to your home loan. The balance you hold in this account is offset against your outstanding loan balance when your lender calculates the interest you owe each month.

For example, if you have a home loan of A$400,000 and A$20,000 sitting in your offset account, you will only pay interest on A$380,000. The A$20,000 is subtracted (offset) from the principal before interest is applied. Your savings remain accessible in the offset account, you can deposit and withdraw funds as needed, and you continue to benefit from the interest reduction for as long as the money stays in the account.

According to ASIC MoneySmart, offset accounts are a popular feature on many Australian variable-rate home loans and can help borrowers save thousands of dollars in interest over the life of the loan (MoneySmart, 2024).

How an Offset Account Works

Offset accounts operate on a simple principle: the lender calculates your loan interest daily or monthly using your loan balance minus the balance in your linked offset account.

Here is a worked example. Suppose your home loan balance is A$500,000 at a variable interest rate of 6.00 per cent per annum. Without an offset account, you pay interest on the full A$500,000. If you have A$30,000 in an offset account, your lender charges interest on A$470,000 instead. Over a year, the interest saving is approximately A$1,800 (A$30,000 x 6.00 per cent), and that saving compounds over the life of the loan if you maintain the offset balance.

You can use the offset account for everyday banking: salary deposits, bill payments, and withdrawals. Unlike a redraw facility, the money in your offset account is not locked into your loan. It remains liquid and can be accessed at any time via debit card, internet banking, or ATM, depending on the account type your lender offers.

Variable interest rates move with the Reserve Bank of Australia cash rate and broader market conditions, so the value of your offset savings will fluctuate as your home loan rate changes (RBA, 2024). When rates rise, the interest saved by your offset balance increases proportionally.

Types of Offset Accounts

Australian lenders typically offer two kinds of offset accounts: full offset and partial offset.

Full offset (100 per cent offset): the entire balance in your offset account is subtracted from your loan balance when calculating interest. This is the most common type and delivers the maximum interest saving. Most major lenders in Australia offer full offset on their variable-rate home loan products.

Partial offset: only a portion of your offset account balance (for example, 50 per cent or 60 per cent) is offset against the loan. Partial offset accounts are less common today but may appear on some packaged loan products or with smaller lenders. A partial offset delivers lower interest savings than a full offset.

When comparing home loan features, confirm whether the offset is full or partial. A full offset is almost always the better choice if you plan to maintain a significant balance in the account.

Benefits of a Mortgage Offset Account

The primary benefit of an offset account is the interest saving. Because you pay less interest each month, you can either reduce your monthly repayment amount or keep the repayment the same and pay off the loan principal faster. Many borrowers choose the second option, which shortens the loan term and saves even more interest over time.

Additional benefits include:

  • Liquidity and flexibility: your savings remain accessible. You are not required to lock funds into the loan, so you can withdraw money for emergencies, opportunities, or planned expenses without applying for a redraw or paying a fee.
  • No interest earned, but no tax either: offset accounts typically do not earn interest themselves (the balance simply reduces your loan interest). This means you avoid paying tax on interest income, which can be an advantage for high-income earners compared to a standard savings account.
  • Simplicity: you can deposit your salary and manage everyday spending from the offset account, consolidating your banking and maximising the offset benefit throughout each month.

According to Finder Australia, borrowers with variable-rate loans who regularly maintain a balance of A$20,000 or more in an offset account can save tens of thousands of dollars in interest over a 25 or 30 year loan term (Finder, 2024).

Drawbacks and Considerations

Offset accounts are a valuable feature, but they are not free or suitable for everyone.

Higher interest rates or fees: home loans with offset accounts often carry a slightly higher variable interest rate (typically 0.10 to 0.30 percentage points above a basic variable loan) or an annual package fee of A$300 to A$400. You should calculate whether the interest saving from your offset balance outweighs the extra cost. If you cannot maintain a meaningful balance in the offset account, a basic variable loan without an offset may be cheaper overall.

Limited to variable-rate loans: offset accounts are rarely available on fixed-rate home loans in Australia. If you fix your interest rate, you will usually lose access to the offset feature during the fixed period. Some lenders offer split loans, where part of the loan is variable with an offset and part is fixed, giving you a hybrid approach.

Discipline required: the offset benefit only works if you keep funds in the account. If you regularly draw the balance down to near zero, the interest saving disappears. Offset accounts suit borrowers who can maintain a buffer or who deposit their salary and savings into the account consistently.

Comparison rate: when comparing home loans, always check the comparison rate, which includes most fees and charges. A loan with an offset account and a package fee may have a higher comparison rate than a basic loan, even if the advertised rate looks similar. Rates change frequently, so verify current terms with a licensed lender or mortgage broker before deciding.

Who Should Consider an Offset Account?

An offset account makes the most sense if:

  • You have a variable-rate home loan (or the variable portion of a split loan).
  • You can maintain a consistent balance in the account, either from salary deposits, savings, or both.
  • You value liquidity and want to access your money without redrawing from the loan.
  • You are a high-income earner and prefer to avoid earning taxable interest on a standard savings account.

For borrowers who keep minimal savings or prefer the simplicity and lower cost of a basic variable loan, an offset account may not deliver enough value to justify the higher rate or fees.

Offset Account vs Redraw Facility

Offset accounts and redraw facilities both allow you to use extra funds to reduce your home loan interest, but they work differently.

A redraw facility lets you make additional repayments into your loan and then redraw those extra payments if you need the money later. The extra repayments reduce your loan balance and the interest you pay. However, redraw is less flexible: some lenders charge a fee per redraw, impose a minimum redraw amount, or restrict how often you can access the funds. In rare cases, lenders can limit or suspend redraw access (within the terms of the loan contract), although this is uncommon.

An offset account keeps your money separate from the loan in a linked transaction or savings account. You have full, immediate access to the funds at any time, with no redraw fees or restrictions. The trade-off is that offset accounts are typically only available on loans with a higher interest rate or package fee.

For maximum flexibility and control, most borrowers prefer an offset account if they can maintain a balance and accept the cost. Redraw is a simpler, lower-cost alternative for borrowers who make occasional extra repayments but do not need daily access to the funds.

Conclusion

A mortgage offset account is a practical feature on many Australian variable-rate home loans, allowing you to use your everyday savings to reduce the interest you pay on your home loan without locking the money away. By offsetting your loan balance with funds in a linked account, you can save thousands of dollars in interest over the life of the loan, shorten your loan term, or simply enjoy lower monthly repayments.

Offset accounts suit borrowers who value flexibility, maintain a healthy account balance, and have a variable-rate loan. Before choosing a loan with an offset account, compare the total cost (interest rate, fees, and comparison rate) against a basic variable loan to confirm the offset benefit justifies the extra expense. Eligibility, fees, and features vary by lender and product, so consult a licensed mortgage broker or lender for advice tailored to your financial situation.

General Advice Warning

The information in this article is general in nature only and does not consider your personal objectives, financial situation, or needs. You should consider obtaining personal advice from a licensed mortgage broker or financial adviser before making any decision about a home loan or offset account. This article is not personalised financial, lending, or legal advice.

Interest rates, fees, loan features, and eligibility criteria vary by lender and product and change frequently. The examples and figures in this article are for illustration only and may not reflect current market conditions. Always verify current rates, terms, and product details with a licensed lender or mortgage broker before applying for or switching a home loan.

Home loan products and their features, including offset accounts, are subject to the lender’s credit assessment and approval. Your ability to access an offset account depends on the loan product, your financial circumstances, and the lender’s lending criteria at the time of application.