The big four Australian banks made more than A$27 billion (NZT $31b) in profits in the past year, making Australasia's banking sector one of the world's most successful.
The profit growth came despite low demand for loans from businesses, and strong competition for deposits from cautious consumers, analysts said.
The main factors driving profit growth were lower costs from unpaid debts and stronger performances from wealth management and institutional banking activities.
Efficiency also improved, but costs rose slightly due to investments in new technology and staff expenses, PwC Australia banking analyst Stuart Scoular said.
Higher staff expenses came despite three of the banks reducing employee numbers, most notably National Australia Bank (NAB) where almost 1,200 positions were cut.