The RBNZ and FMA didn't find the same sort of misconduct as the Australian inquiry, but did discover weaknesses in lenders' internal processes for monitoring conduct.
The Reserve Bank didn't think there were any regulatory gaps from a prudential supervision point of view.
However, the FMA said there were a number of holes, particularly around the lack of conduct requirements in the delivery of banking products without financial advice.
The FMA said its own limited mandate in dealing with banking conduct and the central bank's resourcing constraints probably contributed to the industry responding to conduct risks more slowly and shallowly than would be the regulator's preference.
McAnulty's bill has yet to be drawn in the random ballot process for Members' Bills.
In November, Prime Minister Jacinda Ardern and Commerce Minister Kris Faafoi said legislation to improve oversight was likely to come after the banks had reported back in March on individual programmes worked up for them by the regulators.
It would also let ministers consider any new issues raised in the final report of the Australian Royal Commission, due in February.
In a cabinet paper published on the Ministry of Business, Innovation and Employee website, Finance Minister Grant Robertson and Faafoi proposed that the Government revisit the potential regulatory gap, which would require considerable policy work. MBIE would lead the policy work and report to Faafoi.
McAnulty's bill, as written, would require lenders to provide six-monthly reports to the RBNZ on the number of complaints they received against the code, how those issues were resolved, and any other information required by the central bank. It wouldn't impose financial sanctions, rather it adopts "the approach that sunlight is the best disinfectant".
The RBNZ would then have to publish reports on the total number of complaints received, how they were dealt with for the system as a whole, and also for each individual lender.
Private banks currently have a voluntary code of practice that was recently updated by the New Zealand Bankers' Association. Its complaints process uses the Banking Ombudsman to help deal with complaints a bank can't resolve on its own.