ANZ Mortgage Class Action: Customers Win Despite No Losses (2026)

ANZ customers underpaid their mortgages - so why are they set to get a payout?

The recent High Court ruling against ANZ in a class action lawsuit over breaches of the Consumer Contract and Credit Finance Act has sparked curiosity and raised questions. Despite no customers being left out of pocket, the bank is set to pay out millions. Here's why:

A Coding Error with Consequences

Between 2015 and 2019, ANZ used a third-party developer to design a software package for generating loan variation letters. A coding error in the loan calculator meant it didn't include accrued but unpaid interest when calculating new repayment amounts. This resulted in customers being undercharged by around $2 a month.

Justice Geoffrey Venning acknowledged the error's impact, stating that ANZ effectively compensated customers for the underpayment. However, the court's ruling goes beyond just compensating customers.

Rebuilding Trust and Ensuring Accuracy

Economist Shamubeel Eaqub emphasized the importance of reliable systems in the banking sector. He testified that a lender's failure to meet disclosure requirements can erode trust and hinder product comparison, reducing competition. This case highlights the need for banks to prioritize accuracy and transparency in their operations.

A Payout for Affected Customers

The High Court ordered ANZ to refund the representative plaintiffs $32,728.42, a significant amount for those with $650,000 borrowings. This decision represents the interests of approximately 17,000 customers who received inaccurate letters. The bank has estimated a maximum potential liability of $125 million, a substantial figure that underscores the seriousness of the breach.

Broader Implications and Future Changes

This case has broader implications for the banking industry. A recent change to the Credit Contracts and Consumer Finance Act allows courts to determine fair compensation in cases of breaches, moving away from full repayment. While other banks may not face similar consequences, ANZ's situation highlights the importance of adhering to disclosure requirements and maintaining accurate systems.

Learning from Mistakes

ANZ's response to the error, including fixing it, reporting it to the Commerce Commission, and providing compensation, demonstrates a commitment to accountability. However, the court's ruling serves as a reminder that even minor discrepancies can have significant repercussions. It encourages banks to prioritize transparency and accuracy to maintain customer trust and avoid potential legal pitfalls.

In conclusion, the ANZ case highlights the importance of accurate systems and transparency in the banking sector. While customers have been compensated, the court's ruling emphasizes the need for banks to learn from their mistakes and prioritize customer trust. As the industry evolves, adhering to legal requirements and maintaining accuracy will be crucial for banks to thrive in a competitive market.

ANZ Mortgage Class Action: Customers Win Despite No Losses (2026)
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