What is the nature of the social security paid by the buyout unit?

Hello, dear. After the unit buys out, it pays social security on its own, which belongs to employee pension insurance. For employees, social insurance is usually said to be "five insurances and one fund", that is, endowment insurance, medical insurance, unemployment insurance, maternity insurance and work injury insurance, and one fund is housing provident fund. Housing accumulation fund: the proportion of specific units and individuals is 50%, calculated according to the average annual salary of individuals. The state stipulates that the housing accumulation fund cannot be lower than the salary.