NZ First leader Winston Peters wants an inquiry into the "obscene" profits foreign-owned banks are making.
All New Zealand's big banks are Australian-owned and Mr Peters says ANZ National is on target to post a record profit of more than $1 billion.
"We are in the middle of a global financial crisis yet a single bank is in the process of manufacturing a record profit from the wallets of hard working New Zealanders," he said today.
"Year on year they are making extraordinary profits - last year the big four Australian banks on average increased profits by 28 percent, it's totally outrageous."
Mr Peters says a full-scale, independent inquiry must be held and its brief should be to find way to ensure a bigger slice of the profits stay in New Zealand.
"With the economic gloom showing little sign of lifting, now is the time for an inquiry into banks' obscene profit margins."
NZN