Is it legal to buy social security after the company becomes a full member?

Legal analysis: illegal. You should also buy insurance during the probation period. The probation period also means that the employer and the employee have established a labor relationship. Since the establishment of labor relations, it is necessary to pay social insurance for workers, which is the legal responsibility and obligation of the employer. Otherwise, once the employee applies for labor arbitration, the enterprise will lose, and in addition to making up the payment, it may also be subject to administrative punishment by the social security labor inspection department.

Legal basis: People's Republic of China (PRC) Social Insurance Law.

Article 4 Employers and individuals who pay social insurance premiums according to law in People's Republic of China (PRC) have the right to inquire about payment records and personal rights and interests records, and ask social insurance agencies to provide social insurance consultation and other related services. Individuals enjoy social insurance benefits according to law and have the right to supervise the payment of their own units.

Article 58 An employing unit shall, within 30 days from the date of employment, apply to the social insurance agency for social insurance registration for its 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.