The repayment grace period for credit cards is usually based on the provisions of the "China Bank Card Industry Self-Discipline Convention". Banks such as China Merchants Bank provide cardholders with a 3-day free repayment grace period. That is, if the final repayment date is set on the 5th of each month, as long as the repayment is completed before 24:00 on the 8th of the month, personal credit will not be affected. Records, no need to apply for this service additionally.

The Convention emphasizes information disclosure and customer rights, requiring card issuers to clearly indicate interest calculation rules in credit card application forms and provide calculation rules and examples through multiple channels. At least 3 days before the repayment date, the bank will remind cardholders through bills, text messages, etc. to ensure that customers fully understand the repayment responsibilities and deadlines.

In order to improve service quality, the Convention advocates "time-tolerant service" and "tolerance service". The cardholder's repayment within the repayment grace period is regarded as on-time repayment. If the cardholder repays the balance but does not exceed a certain amount (such as 10 yuan), it will also be regarded as full repayment. If the repayment amount is lower than the minimum repayment amount, you may be required to pay late fees, but they must not exceed national standards.

The Convention also involves regulatory communication, internal supervision and violation penalty mechanisms to ensure the standardized operation of the bank card business. For violations, the Bank Card Committee has the right to take measures such as correction, notification of criticism, suspension or cancellation of membership.

In general, the calculation methods and rules of the credit card grace period are implemented in accordance with the "China Bank Card Industry Self-Discipline Convention", aiming to protect the rights and interests of cardholders and maintain the healthy order of the credit card market.