Is it illegal for the company not to pay social security to its employees?

Legal analysis: it is illegal for a company not to buy social insurance for its employees, and the company should pay social insurance premiums for its employees on time according to law. If the employer fails to pay or make up the social insurance premium within the time limit, the social insurance premium collection agency may inquire about its deposit account in banks and other financial institutions, and may apply to the relevant administrative department at or above the county level for making a decision on the allocation of social insurance premiums, and notify its bank or other financial institutions in writing to allocate social insurance premiums. If the balance of the employer's account is less than the social insurance premium that should be paid, the social insurance premium collection agency may require the employer to provide guarantee and sign a deferred payment agreement.

Legal basis: Article 63 of the Social Insurance Law of People's Republic of China (PRC) stipulates that if an employer fails to pay social insurance premiums in full and on time, the social insurance premium collection agency shall order it to pay or make up within a time limit.