If he leaves on the 20th of this month, who will pay the social security this month?

Legal analysis: employees leave their jobs on the 20th, and the social security in that month is paid by the unit, and the individual pays the personal part.

Legal basis: People's Republic of China (PRC) Labor Contract Law.

Article 50 When the employer dissolves or terminates the labor contract, it shall issue a certificate of dissolution or termination of the labor contract, and go through the formalities for the transfer of the file and social insurance relationship for the employee within 15 days.

Laborers shall handle the work handover according to the agreement of both parties. If the employing unit should pay economic compensation to the workers in accordance with the relevant provisions of this law, it should pay it when the work handover is completed.

The employing unit shall keep the text of the dissolved or terminated labor contract for at least two years for future reference.