Most credit card companies charge a minimum payment based on two to four percent of the outstanding balance. For example, if your outstanding credit balance is $500 and your minimum payment rate is two percent, then the least amount due on the bill payment date is $10 (=500x2%). If your applicable APR is 15 percent, this means your monthly interest amounts to 500 x 15%/12= $6.25. Of the minimum payment of $10 you make, only $10-6.25 =$3.75 is applied to reduce the outstanding balance of $500.
Assuming you do not charge anything more to your credit card, your next minimum payment will be computed on a balance of $496.25 (=500-3.75). This time around, your minimum payment works out to $9.92. Of this, $6.20 is applied against interest, and the balance $3.72 goes to reduce your principal. If you make only the minimum payment, a higher percentage (in this case 62.5 percent of each payment is applied against interest while the balance helps to reduce your outstanding principal. At this rate, it will take a long time to pay off your credit card balance.