MELBOURNE, Australia--Customers of one of Australia's largest banks scored a partial victory Wednesday after a judge ruled late-payment fees on credit cards issued by it were illegal, in a test case that has implications for other banks involved in similar class actions.

Federal Court judge Michelle Gordon agreed late-payment fees charged by Australia & New Zealand Banking Group Ltd. were "extravagant, exorbitant and unconscionable."

However, Ms. Gordon ruled in the judgment that other fees on credit cards and deposit accounts that thousands of customers had sought to have refunded weren't unfair penalties.

Bentham IMF Ltd., which funded the lawsuit, estimated late fees accounted for about 25% of the claims against ANZ and could amount to roughly 60 million Australian dollars (US$53 million). That figure is likely to rise when interest is added in, its investment manager, James Middleweek, said.

Mr. Middleweek said it was likely that the judgment on the other fees would be appealed.

About 43,500 ANZ customers had signed up online to the lawsuit to have individual fees ranging from A$25 to A$45 refunded.

Maurice Blackburn Lawyers, acting on behalf of the claimants, had argued the actual cost to the bank was a fraction of the fees charged. The law firm has filed similar suits on behalf of more than 140,000 members with more than A$180 million in claims against seven other lenders, including Commonwealth Bank of Australia Ltd. (CBA.AU), National Australia Bank Ltd. (NAB.AU), Westpac Banking Corp. (WBC.AU) and Citigroup Inc.'s (C) Citibank.

The class action against ANZ, dating from September 2010, was the first to be filed and covered fees charged over a six-year period to 2010. ANZ said it introduced a new fee structure in December 2009.

"The implications of today's decision for ANZ and its customers are still far from clear and it is likely to be some time until this matter is finally resolved," said Philip Chronican, chief executive of ANZ's Australian operations.

Mr. Chronican said the bank was pleased the court decided that other fees including overlimit fees on credit cards and nonpayment fees on accounts weren't penalties.

Ms. Gordon in her judgment said that while late-payment fees on credit cards constituted a penalty, the other fees were of a different character. Both sides have been told to discuss damages and penalties before returning to the court by Feb. 12.

The ruling represents a blow to the reputation of Australia's banks, although the amount that they stand to pay out in claims is small in terms of the size of their balance sheets, said one Sydney-based analyst, who declined to be named. The banks lowered fees from the end of 2009, so no further changes are likely, he added.

Write to Robb M. Stewart at robb.stewart@wsj.com

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