Social security contributions are divided into six grades.

Legal analysis: The six grades of social security contributions are: 60%, 70%, 80%, 90%, 100%, 150%, 200%, 250% and 300% of the average salary. According to different local policies, the payment ratio is also different. Generally, social security is paid in an individual capacity: endowment insurance: individuals pay 20%; Medical insurance: individuals pay 5%. Based on the wage income of the insured, a certain proportion is stipulated to collect insurance premiums. Adopting the proportional system, the initial main purpose of social insurance is to compensate the income lost by the insured in risk accidents in order to maintain their minimum living. Therefore, we should refer to his usual income, on the one hand, as a standard to measure payment, on the other hand, as the basis for premium calculation. The biggest drawback of the work-based proportional belt clearing insurance premium system is that the burden of social insurance is directly related to wages. Whether employers and employees bear social insurance premiums, or one of them bears social insurance premiums, the negative burden of social insurance is manifested in the increase of labor costs, which will lead to capital crowding out labor, thus leading to an increase in unemployment.

Legal basis: People's Republic of China (PRC) Social Insurance Law.

Article 12 The employing unit shall pay the basic old-age insurance premium according to the proportion of the total wages of employees stipulated by the state and record it in the basic old-age insurance pooling fund.

Employees shall pay the basic old-age insurance premium in accordance with the proportion of wages stipulated by the state and record it in their personal accounts.

Individual industrial and commercial households without employees, part-time employees who have not participated in the basic old-age insurance in the employing unit and other flexible employees who have participated in the basic old-age insurance shall pay the basic old-age insurance premiums in accordance with state regulations and record them in the basic old-age insurance pooling fund and individual accounts respectively.