Social security premiums are paid at the bank. The date is the due date. The date of social security payment is not the date of payment. Social security fees are deducted by the tax bureau every month, usually in the first half of each month. After the deduction, the social security bureau needs to check whether the payment is correct, because social security is often adjusted. After the verification is completed, there will be a procedure to complete the payment verification, and then the money will be transferred to an account. However, the arrival period is different due to different banks. Therefore, the date of social security payment is not the date of payment.