The research showed a 'profound shift' in Kiwis' attitudes to saving, with more people seeing the value of putting money away, said RaboDirect general manager Mel Templeton.
The poll showed investment in shares and the property market are also on the rise.
In 2010, four per cent of Kiwis were investing in both shares and investment properties, which was now up to 15 and 13 per cent this year.
However, there were still too many people missing out on deals by not shopping around, she said.
"And with Reserve Bank figures showing Kiwi households have more than $80 billion in retail cash savings, there's a lot of money that could potentially be working harder."
Templeton said savers should make the most of a competitive market, and she advised looking for consistently high interest rates that deliver value and low fees.
"It's a great environment for savers who should be looking to maximise their savings by getting the best deals possible."