"All of the banks are fighting for business and consumers are benefiting from that," Bolton said.
"It is a competitive market so across the industry you are getting promotional deals of around $2000 thrown at you whether it is cash, paint or a tablet."
Bolton said no bank would risk losing a customer over rates so would often match what another bank was offering.
"Banks are not going to let other banks beat them on rates. They are not going to let another bank steal their customers," Bolton said.
Bruce Thompson of Kiwibank said increased competition was expected with the buoyant spring housing market. Kiwibank was gaining 2000 new customers each week.
"We have gone from 1500 switching to Kiwibank to 2000 a week. A lot of those are from National Bank but it also shows there is some mood for change," Thompson said.