Legal analysis: Credit cards have regulations. The calculation method of overdue penalty (formerly late payment penalty) is stipulated in the credit card regulations, and the total interest can exceed the principal. There is an agreement when applying for a credit card, and the agreement is also signed in accordance with the articles of association. Cardholders should abide by the articles of association and the agreement. If it is overdue, they must abide by the articles of association.

Legal basis: "People's Republic of China and Civil Code"

Article 673: If the borrower fails to use the loan in accordance with the agreed purpose of the loan, the lender may stop Issue loans, withdraw loans early or terminate the contract.

Article 674 The borrower shall pay interest according to the agreed period. There is no agreement or the agreement is not clear about the period for payment of interest, and it cannot be determined according to the provisions of Article 510 of this Law. If the loan period is less than one year, it shall be paid when the loan is returned; if the loan period is more than one year, It shall be paid at the end of each year. If the remaining period is less than one year, it shall be paid when the loan is returned.

Article 676 If the borrower fails to repay the loan within the agreed time limit, he shall pay overdue interest in accordance with the agreement or relevant national regulations.