Why is the monthly deduction of social security different?

Legal analysis: the social security deducted by the company is different every month because the payment base depends on the average monthly salary of employees in the previous year. Employees shall participate in the basic old-age insurance, and the employer and employees shall jointly pay the basic old-age insurance premium. Individual industrial and commercial households without employees, part-time employees who have not participated in the basic old-age insurance in the employer and other flexible employees can participate in the basic old-age insurance, and individuals pay the basic old-age insurance premium.

Legal basis: Article 4 of People's Republic of China (PRC) Social Insurance Law. Employers and individuals in People's Republic of China (PRC) pay social insurance premiums according to law, and have the right to inquire about payment records and personal rights records, and require social insurance agencies to provide social insurance consultation and other related services. Individuals enjoy social insurance benefits according to law and have the right to supervise the payment of their own units.