"As Chairman, I am accountable for governance. I have always sought to act in the best interests of the company and have been in discussions with the Board about the most appropriate course of action, including my resignation.
"The Board has now accepted my resignation as chairman as a step towards restoring the trust and confidence in AMP."
AMP's share price has plummeted in the wake of the inquiry which heard the company made a deliberate decision to continue charging fees to a group of "orphan" clients for three months when they went into a central pool, despite them receiving no advice services and legal advice that it was unlawful.
The issue arose when AMP acted as a buyer of last resort, buying an adviser's client book if they were unable to sell it to another authorised AMP representative.
In some cases, system errors were to blame but the inquiry heard AMP did not tell ASIC about the deliberate decision to keep charging the fees.
AMP has refunded A$4.7 million (NZ$5 million) in fees to date to 15,712 customers affected.
The company said it had completed a review and the fee for no services practices ceased in November 2016.