Banking customers who are found to have suffered a direct financial loss or damage through their bank will now be able to claim up to $350,000 through the Banking Ombudsman.
The dispute resolution scheme, which is free for the public to use, has lifted its claim limit from $200,000.
Until now the Banking Ombudsman had to turn away people with complaints over its cap unless the bank involved agreed for it to pursue the case.
Those with bigger claims had to go to the Disputes Tribunal.
Banking Ombudsman Nicola Sladden said the increase would provide more people with access to justice through the scheme.