There are essential differences between credit card overdraft and loan. No matter whether you repay the loan on time or not, the loan will be charged with interest, but if you repay the loan in full within the repayment date stipulated by the credit card, you will not be charged any fees. Some credit cards charge an annual fee, some credit cards charge no annual fee if they swipe their cards several times a year (usually six times), and some credit cards charge no annual fee.