1, the insurance premium paid by the insured according to a certain proportion of his salary income (if the salary income cannot be determined according to the average salary of employees);

2. The insurance premium paid by the insured unit according to a certain proportion of the total wages of the employees of the unit;

3, the government's financial subsidies to social insurance funds; Bank interest or return on investment from social insurance funds and social donations, etc.

People's Republic of China (PRC) social insurance law

Article 11

The basic old-age insurance combines social pooling with individual accounts.

The basic old-age insurance fund consists of employers, individual contributions and government subsidies. Article 12

The employing unit shall pay the basic old-age insurance premium according to the proportion of the total wages of its 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.