Almost 50% of people who own a credit card do not know the interest rate they are paying, according to exclusive new research.
The findings, from the Moneywise Consumer Opinion Survey of 20,000 people, reveal that 46.5% of credit card holders have no idea of the rate on their card.
The research also shows that only 14.4% of people gave a low rate of interest as the main reason for taking out their card, while 10.6% of respondents said they chose their card because of brand, and 13.6% said the balance transfer offer was their key consideration.
The biggest single reason for taking out a credit card was the rewards on offer. Many retailers and customer-facing companies now offer their own credit cards, through which shoppers can earn vouchers and cashback.
Some of the most popular rewards cards include: American Express's British Airways card, where holders earn 3,000 Avios points if they spend £500 in the first three months; and Tesco Bank's Clubcard card, where holders earn one Tesco Clubcard point for every £4 spent in each purchase transaction.
Other popular rewards cards are Lloyds TSB's Avios card, where holders who spend £500 a month for the first three months get 15,000 Avios points, and Amazon's card, which offers holders a £5 Amazon gift certificate plus three loyalty points every time they spend £1 on the card in the first 90 days.
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However, users who take out a rewards card should remember to pay their balance in full each month as this type of card does not always have the best interest rate.
The Moneywise research also shows that a third of people hold one credit card while a third hold two cards, and 53.9% of people have had a credit card for five years or more.
The results of the Consumer Opinion Survey have been used to crunch the shortlist for the Moneywise Customer Service Awards 2013 – at which Britain's most trusted credit card provider will be announced on June 13th.