The overdue interest of Agricultural Bank of China is calculated from the date of bookkeeping at a daily interest rate of 0.5%. It is charged on a daily basis and compound interest is calculated on a monthly basis. The formula for calculating overdue interest is: interest = unpaid principal × 0.05%. Agricultural Bank of China usually gives cardholders a two-day grace period for repayment. As long as the cardholder repays within two days of the repayment date, it will not be considered overdue. Once it is exceeded, overdue interest will be charged.