Is it illegal for private enterprises not to pay social security?

Legal Analysis: Violation of People's Republic of China (PRC) Social Insurance Law. The social insurance fee collection agency shall order it to pay within a time limit or make up for it, and from the date of default, an overdue fine of 5/10000 shall be charged on a daily basis; Failing to pay within the time limit, the relevant administrative departments shall impose a fine of more than one time and less than three times the amount owed.

Legal basis: Article 86 of People's Republic of China (PRC) Social Insurance Law. If the employer fails to pay the social insurance premium in full and on time, the social insurance premium collection agency shall order it to pay within a time limit or make up for it, and impose a 0.5% late fee on a daily basis from the date of default. Failing to pay within the time limit, the relevant administrative departments shall impose a fine of more than one time and less than three times the amount owed.