There are calls for stricter rules for retailers on the added fees applied to interest-free deals.
Consumers can put everything from whiteware to jewellery on interest-free finance terms that often stretch to many years.
The Fair Trading Act requires that retailers not offer a cheaper price to cash customers compared to those who opt to pay for a purchase via interest-free finance. But the deals come with administration costs and annual fees, which can add hundreds of dollars.
Consumer NZ has made a submission on the Responsible Lending Code the Government is developing, which will govern how lenders operate.
It may require lenders to advertise interest rates as per annum rates, which can top 500 per cent.