Last year was one of the strongest in recent times for the profitability of New Zealand's banks, according to KPMG's latest Financial Institutions Performance Survey.
The banks' combined net profits after tax increased from $2.77 billion in 2010 to $3.30b in 2011, KPMG said.
The survey, which analysed the performance of New Zealand's registered banks, showed earnings strength coming through despite the trend of customers paying off debt and the slow start to rebuilding activity in Christchurch after last year's devastating earthquakes.
John Kensington, KPMG's head of financial services, said the deleveraging trend highlighted in last year's report showed "no clear sign of abatement" and could continue into 2013 and beyond.
In part, deleveraging was a reflection of soft business confidence and fears around slowing demand from China and Europe.