The company's social security contribution base is much lower than the average salary of the previous year. Is it illegal?

There is no question of legality or illegality.

1, the salary should meet the requirements of the local minimum wage standard, which is different from the minimum payment base of social insurance.

The minimum wage is determined by the local government; However, the minimum payment base is 60% of the average social wage of local employees in the previous year. Not a concept.

If it is lower than the minimum payment base, the minimum payment base stipulated by the state shall be used as its payment base.

2. Other institutions have no right to ask whether enterprises will raise wages as long as they reach the minimum wage standard; Whether you will raise your salary depends on your own wishes.

good luck