The FMA did not carry out a separate investigation into ASB but because of the Commission's conclusions, it had "concerns about potentially misleading conduct" by the bank over the sale and marketing of interest rate swaps to some rural customers.
The FMA acknowledges this has not been tested by a court.
Nonetheless, the parties have reached a settlement in which ASB will have its sale, promotion and marketing of interest rate swaps and terms funds independently reviewed.
It will then implement the recommendations from it.
The FMA's General Counsel, Liam Mason, said today that "consumers are entitled to receive full and accurate information when purchasing financial products or services".
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"One of the FMA's strategic priorities is to ensure that sales processes and advice services reflect the best interests of customers. This settlement recognises our concerns about the imbalance of information that can exist between customers and financial service providers."
"The review will also help to ensure robust sales and advice processes are in place, including the disclosure of all relevant information, and that they meet the standards of the new regulatory framework," he said.
The FMA has already reached similar deals with ANZ and Westpac.