What Are Credit Card Interest Charges? | Discover | Credit Resource Center
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Credit card interest charges are a percentage of your unpaid balance, called an annual percentage rate, or APR. If you carry a balance, you’ll also be subject to interest charges as well. That’s why it’s good practice to pay your balance in full each month. Comparing credit card interest charges before opening a new card may help you choose the card that will charge the lowest interest rate. Taking advantage of introductory offers, like 0 percent APR, can help minimize interest charges.
Responsibly using your credit card may also help you minimize the interest charges you have to pay.