What is the latest increase date of Haikou social security in that month?

The 25th. According to official website of Bao Zheng Accounting Network School, Haikou employers must handle social security for employees and pay social security fees according to regulations. Therefore, the employer must go through the formalities of social security increase in time after hiring new employees, and then go through the formalities of social security reduction after employees leave their jobs. The processing time for monthly social security increase is from 5th to 25th of each month.