If all the bill amount is paid off on the last repayment date, you don't need to pay any interest and late fees, and you can 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 the consumption should be calculated with interest of five ten thousandths per day from the day you spend it, with daily interest and monthly compound interest.

According to the Notice on Printing and Distributing the Measures for the Administration of Credit Card Business:

Article 19 Credit card overdraft interest shall be calculated at the rate of five ten thousandths of daily interest within 15 days from the date of signing or the date of bank account entry, and at the rate of ten thousandths of daily interest for more than 15 days, and at the rate of fifteen thousandths of daily interest for more than 3 days or the overdraft amount exceeds the prescribed limit. The overdraft interest is not divided into sections, and the interest is calculated according to the highest interest rate grade of the deadline or the highest overdraft amount.

Extended information:

According to the Notice on Printing and Distributing the Measures for the Administration of Credit Card Business:

Article 55 In any of the following circumstances, the People's Bank of China shall order it to make corrections, confiscate its illegal income and impose a fine of 5, yuan to 1, yuan; If the circumstances are serious or overdue, it may be ordered to suspend business for rectification.

(1) failing to implement the technical standards stipulated in these measures;

(2) lowering the handling fee standard at will;

(3) Failing to implement the overdraft interest rate and interest-bearing measures stipulated in these Measures.

Article 56 If the card-issuing bank violates the provisions of these Measures and fails to submit the credit card articles of association, filing materials and business statements to the People's Bank of China, the People's Bank of China shall order it to make corrections; Overdue reform, ranging from 1 thousand yuan to 1 thousand yuan fine.

Article 57 In case of any of the following circumstances, the card-issuing bank shall be punished according to the Law of the People's Republic of China on Commercial Banks and the relevant provisions on cash management:

(1) Failure to implement the prescribed deposit interest rate;

(2) failing to deposit the deposit reserve with the People's Bank of China as required;

(3) helping cardholders to withdraw cash in violation of regulations.

article 58 if the issuing bank fails to send the payment stop list to the special unit within the specified time, causing financial losses, the issuing bank shall bear the economic responsibility.

article 59 if the card-issuing bank or correspondent bank violates the provisions of these measures, it will be fined 5, yuan to 1, yuan if it helps the unit cardholder to transfer the money from other deposit accounts or sales income to his credit card account, or if it helps the individual cardholder to transfer other money to his credit card account.

Baidu Encyclopedia-Notice on Printing and Distributing the Measures for the Administration of Credit Card Business