No unit can buy social security at one time?

Yes, social insurance is a social and economic system that provides income or compensation for people who are unable to work, temporarily unemployed or suffer losses due to health reasons. The Social Insurance Law of People's Republic of China (PRC) stipulates: 1. When an individual participates in the basic old-age insurance for employees and reaches the statutory retirement age, if the accumulated payment is less than 15 years, it may be extended to 15 years. If the insurance was insured before the implementation of the Social Insurance Law, and the payment is still less than 15 years after the extension of 5 years, it can be paid in one lump sum. After the employee's basic old-age insurance reaches the statutory retirement age, if the accumulated payment is less than 15 years, he/she may apply for transferring to the new rural social old-age insurance or urban social old-age insurance where his/her household registration is located, and enjoy the corresponding old-age insurance benefits.

Legal objectivity:

People's Republic of China (PRC) social insurance law

Article 60

The employing unit shall declare itself and pay social insurance premiums in full and on time, and shall not postpone or reduce the payment except for legal reasons such as force majeure. The social insurance premiums that employees should pay shall be withheld and remitted by the employer, and the employer shall inform me of the details of paying social insurance premiums on a monthly basis.

Individual industrial and commercial households without employees, part-time employees who have not participated in social insurance in the employing units and other flexible employees can pay social insurance premiums directly to the social insurance premium collection agencies.