Is it illegal for a company to not open a social security account

It is illegal. Now as long as the regular company units, are to pay social security to employees, and companies and units in the recruitment time, basically will also mention five insurance and gold and so on, because it represents the company's welfare is good, if the unit in the recruitment of five insurance and gold, the results of the employees into the job, the unit and refused to give the employees to open an account, you can go to the labor department to complain.

Legal basis:

"The Chinese people*** and the State Social Insurance Law" Article 84 of the employer does not apply for social insurance registration, by the administrative department of social insurance ordered to make corrections within a certain period of time; overdue correction, the employer shall be sentenced to pay social insurance premiums amounting to more than double the amount of more than three times the amount of the fine, and the directly responsible supervisory personnel and other personnel directly responsible for the 500 yuan above and below three thousand dollars.