How many brackets are there in the social security base

***There are five grades. The lowest grade 40 percent, a grade of 60 percent, the second grade of 80 percent, the third grade of 100 percent, the highest grade of 300 percent, the specific according to how many grades to pay contributions with the individual's income and occupation has a certain relationship. The social insurance base, referred to as the social insurance base, refers to the social insurance contribution base of an employee in a social security year, in accordance with the employee's monthly average of all wage income from January to December of the previous year to determine the social insurance contribution base is an important basis for calculating the employer and its employees to pay social security premiums and social insurance treatment of the employee, with an upper limit and a lower limit, the specific amount of the actual situation according to each region. The specific amount is determined according to the actual situation in each region. Social insurance, the core part of the social security system, refers to the state as the main body, the implementation of laws and regulations by the specialized agencies, the use of social forces, through legislative means to raise funds from workers and their employers to establish a special fund to ensure that a certain degree of income compensation for the loss of labor income, so as to ensure that labor reproduction and expansion of reproduction of the normal operation of the system, to ensure social stability. A system.