Is it legal for the company to let employees pay social security themselves?

As a legal person, the company does not need to pay social security by itself. A company as a legal person refers to an enterprise organization established in accordance with the Company Law, which has independent property, can enjoy civil rights and assume civil obligations in its own name, and bear civil liabilities for the company's debts with all its property.

Legal objectivity:

Article 58 of the Social Insurance Law of People's Republic of China (PRC), the employing unit shall, within 30 days from the date of employment, apply to the social insurance agency for social insurance registration for employees. If the social insurance has not been registered, the social insurance agency shall verify the social insurance premium it should pay. Employees-free individual industrial and commercial households who voluntarily participate in social insurance, part-time employees who do not participate in social insurance in the employing unit and other flexible employees shall apply to the social insurance agency for social insurance registration. The state establishes a national unified personal social security number. Personal social security number is a citizen's identity number.