How to calculate the basic salary of the three companies plus social security sharing?

Every family pays each family's social security.

It also depends on the base number declared by each unit. The unit payment is about 30% of the reporting base. Personal salary deduction is about 1 1% of the declared base. There are some differences in the proportion of contributions stipulated in different places. If the wage income of employees is higher than 300% of the local average wage of employees in the previous year, 300% of the local average wage of employees in the previous year will be the payment base.