Mortgage offset accounts are a staple of the Australian lending landscape, yet new research from the University of Sydney suggests they may be deepening financial inequality between borrowers.
The study – led by James Graham (pictured), senior lecturer in the School of Economics, and published in Economic Record – is the first academic analysis of mortgage offset accounts in Australia, despite their widespread use among mortgage holders.
“Around 40% of Australian mortgage holders use mortgage offset accounts, which allow savings held in linked accounts to reduce the interest paid on home loans – for example, a $1 million mortgage with a $100,000 balance held in the offset account would result in interest paid on just $900,000,” Graham said.
“But until now, little was known about who uses mortgage offset accounts, how they’re used, and who actually benefits.”
Graham’s modelling, which draws on Australian household and mortgage data, found that wealthier households with larger loans and more expensive properties are significantly more likely to benefit from offset accounts — while others may be paying unnecessary fees.
“Offset accounts can be a powerful tool for reducing mortgage interest, but they’re not a one-size-fits-all solution,” he said.
“Many households are potentially signing up for these products without fully understanding how they work, and in some cases they may actually be worse off. This confusion is perhaps not surprising given that some lenders provide offset accounts for free, some charge annual fees, while others charge higher interest on the underlying mortgage.”
The study calls for lenders and policymakers to consider fairer mortgage pricing structures that make offset benefits more accessible to middle-income households.
“The economic disparities in the data suggest the possibility that alternative mortgage pricing could improve access and more evenly distribute the benefits of mortgage offset account use,” Graham said.
He noted that some smaller lenders offer fee-free offset accounts, while larger banks often charge annual fees of several hundred dollars, in addition to complex interest rate differentials.
“There’s a lack of transparency in how these products are priced,” Graham said. “If banks offered clearer and more flexible pricing options, we could see broader access to the benefits offset accounts can provide.”
Graham said consumer education and broker guidance are critical to ensuring borrowers understand when an offset account truly delivers value.
“Borrowers may not realise that the effectiveness of an offset account depends on their ability to maintain a healthy savings balance,” he said. “Without that, the interest savings may not outweigh the fees.
“Lenders or mortgage brokers could provide more information and better educate households to help make informed decisions about mortgage offset accounts. This is necessary to ensure that offset account users are getting the interest savings they expect from these products.”
For mortgage advisers, the findings highlight the importance of tailoring offset recommendations to each client’s financial profile. Offset accounts work best for borrowers with strong cash flow and consistent savings balances. For others, basic variable-rate loans or redraw facilities may offer better value once fees and balances are factored in.
“Further research is needed into how mortgage offset accounts are designed and marketed, and how policy can improve financial outcomes for Australian households by making mortgage products more accessible, efficient, and fair for all homeowners,” Graham said.
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