The credit card interest-free period mentioned by banks is generally the longest interest-free period, but not every purchase can get the longest interest-free period.

The interest-free repayment period means that the bank provides interest-free treatment to cardholders who make non-cash transactions and repay in full. The interest-free period starts from the bank’s accounting date and ends on the due repayment date.

There are generally two types of interest-free period settings. One is that the bank clearly stipulates a certain day of each month as the interest-free repayment deadline. The interest-free period is the date between the bank accounting date and the deadline. , both ICBC and Agricultural Bank of China use this method; the other method is for the cardholder to choose a billing date according to needs, and then set the latest repayment date based on the billing date, then the interest-free period is from the bank's accounting date to the latest The date between the repayment dates, such as CCB.

Extended information:

Assume that the account arrival date of your bank is the 10th of each month. If you swipe the card once on May 9th, then, on May 10th The money must be repaid within the next 20 days or 25 days (as for whether it is 20 days or 25 days, each bank is different, Bank of Communications is 25 days, China Construction Bank is 20 days, and CITIC Bank has a maximum of 50 days), so , it is unwise to swipe the card at this time (approaching the account arrival date).

Similarly, if you swiped the card on May 11th, then the calculation of how much money you swiped from May 10th to June 10th will be calculated from June 10th. The money must be repaid within 20 or 25 days (probably July 5th). At this time, from the time you swipe the card to the final repayment date, there is the longest interest-free period, which is about 49 or 55 days, so after the payment date Swiping your card within a few days is the best option.

Reference: Baidu Encyclopedia-Credit Card Interest-Free Period