New Zealand's big four banks collectively made more than $3.5 billion in the last year in another record year for the sector.
Profits grew more than 9 per cent on 2011/2012 - a boost of $303 million across the ANZ, Westpac, ASB and BNZ.
John Kensington, head of financial services at KPMG, said loan growth, lower funding costs and less pressure in competing for deposits had helped boost the bank profits.
At the same time the banks had also managed to keep a tight lid on costs while holding on to their margins.
"Given the size of these businesses it doesn't take much to boost profits when all those planets align."