Kiwibank says an emergency team is working tonight to try to solve a glitch.
Processing of transactions and access to customers' accounts was interrupted today, and phone banking and internet access went down between 3.45pm and 4.30pm and again from 6.30pm.
Newstalk ZB reported ATM and Eftpos access are available but only with cleared funds that were available at 6pm.
Kiwibank said the critical issue was to try to give customers access to their wages, salaries and benefits, but interbank transactions may not be able to be processed and available to customers until tomorrow.