Mortgage Offset Account Errors: Are You Owed Thousands? 2026

Mortgage offset account errors have led to Australian banks paying $55 million in compensation over two years. The Australian Securities and Investments Commission (ASIC) found that major lenders failed to properly link or manage offset accounts, resulting in customers unknowingly overpaying interest. If you have a home loan with an offset account, you may be entitled to compensation.

What Is a Mortgage Offset Account?

A mortgage offset account is a savings account linked directly to your home loan. The balance in this account offsets your outstanding loan principal, reducing the interest you pay each month. For example, if you have a $400,000 loan and $50,000 in an offset account, you only pay interest on $350,000. It is a popular tool used by more than half of Australia’s 3.3 million mortgage holders.

ASIC’s Findings on Offset Account Failures

ASIC reviewed over 200,000 home loans from eight different banks. The regulator revealed weaknesses in how lenders set up, monitored, and managed offset accounts. In some cases, customers were overcharged thousands of dollars in a single month—one borrower incurred an extra $3,500 in interest. The total compensation figure of $55 million is expected to climb as more errors are identified.

Common Error Types

• Offset not applied – The savings account was never linked to the loan.
• Partial linkage – Only part of the balance was offset.
• Delayed updates – Changes to the offset balance were not processed in time.
• System miscalculations – Incorrect interest calculations due to software flaws.

How Offset Accounts Compare to Redraw Facilities

Key Takeaways for Homeowners

• Check your monthly loan statements for any unexplained interest charges.
• Log into internet banking and verify your offset account is correctly linked to your mortgage.
• Contact your lender if you suspect an error and ask for a historical review of your account.
• File a complaint with the Australian Financial Complaints Authority (AFCA) if your bank does not resolve the issue.
• Keep documentation such as account statements and correspondence with the bank.

Steps to Claim Compensation

If you believe you have been affected, start by requesting a full audit of your offset account history from your bank. Many lenders are proactively contacting customers, but you may need to prompt them. If the bank confirms an error, they should refund the overpaid interest plus any fees. If they refuse, escalate to ASIC or AFCA. The process can be completed entirely online or via phone.

FAQ

Don’t ignore your mortgage statements. With billions of dollars in home loans across Australia, even a small administrative error can cost you hundreds or thousands over the life of your loan. Act now to ensure your offset account is working as it should.