New Zealanders collectively owe about $3.6 billion on credit cards, and financial experts warn that people need to start getting smart with their money.
"Credit cards can be used to buy anything and everything and people do, it's so handy. But years ago we used to have cheque books and a running total - you knew what was in the bank, but these days with eftpos and credit cards, it's very, very easy to lose track of how much money you have in the bank," said Margaret Elsworth, president of the Federation of Family Budgeting Services.
"People need to make sure there's money for food and rent and power before they start buying unnecessary items."
Reserve Bank figures from May this year showed New Zealanders owed about $3.6 billion in interest-bearing credit card balances. At an average rate of 17.7 per cent, about $639 million is paid each year in interest.
Ms Elsworth said we lived in a "want now" society - many people feel like they needed to have the latest products instead of waiting and saving.