The chairman of ASB bank says it will bring forward the next review of how it processes and approves executive expenses following the departure of former ANZ boss David Hisco over an expenses dispute.

ANZ announced Monday that Hisco would be departing his $3 million plus a year job immediately after an investigation which alleged he "mis-characterised" certain personal expenses as business expenses.

Those expenses, which ran into the "tens of thousands of dollars" over Hisco's nine-year stint as chief executive, included personal use of chauffeur-driven cars and storage of wine in Australia - his country of birth.