Legal analysis: there is an upper limit on the interest and liquidated damages of credit cards, and the upper limit does not exceed 36% of the amount owed each year. If you pay off the bill in full on the final repayment date, you don't need to pay any interest and late fees, and you can also enjoy the interest-free period given by the bank; If the bill of the current month is not fully paid off, and there is no interest-free period, all consumption will bear interest at the rate of five ten thousandths per day from the date of consumption, with daily interest and monthly compound interest.

Legal basis: Provisions of the Supreme People's Court on Several Issues Concerning the Application of Laws in the Trial of Private Lending Cases Article 28 After the principal and interest of the previous loan are settled, the borrower and the lender will include the interest in the principal of the latter loan and issue a new certificate of creditor's rights. If the previous interest rate does not exceed the annual interest rate of 24%, the amount specified in the reissued creditor's rights certificate can be confirmed as the later loan principal; Excess interest cannot be included in the future loan principal. If the agreed interest rate exceeds the annual interest rate of 24%, and the parties claim that the excess interest cannot be included in the later loan principal, the people's court shall support it.