Australia's corporate regulator has issued a warning that major banks may owe mortgage holders thousands of dollars due to errors involving offset accounts linked to home loans. The issue centres on banks incorrectly calculating interest or failing to properly apply offset balances, meaning affected customers could have been overcharged on their repayments without realising it. This matters because it potentially affects a large number of borrowers who rely on offset accounts as a common way to reduce interest costs on their mortgages.

The warning urges homeowners to check their statements and contact their lender if they suspect they have been affected, as compensation may be owed in cases where errors are identified. While the article does not specify exact figures for how many customers or how much money in total may be involved, it frames the situation as urgent, encouraging borrowers to act promptly to recover any funds they are owed.