legal ground
"Regulations" of housing provident fund management sixteenth
The monthly deposit amount of employee housing provident fund is the average monthly salary of employees in the previous year multiplied by the deposit ratio of employee housing provident fund. The monthly deposit amount of housing provident fund paid by the unit for employees is the average monthly salary of employees in the previous year multiplied by the proportion of housing provident fund paid by the unit.
Article 17
New employees start to pay the housing provident fund from the second month of their employment, and the monthly payment amount is the employee's salary multiplied by the employee's housing provident fund payment ratio. The newly transferred employees of the unit shall pay the housing provident fund from the date when the transferred employees pay their wages, and the monthly deposit amount shall be the employee's monthly salary multiplied by the employee's housing provident fund deposit ratio.