The year-end bonus is not included in the social security base.

Hello, according to the regulations of the state, employees should take their average monthly salary in the previous year as the base of this year's payment salary, and the average monthly salary is calculated according to the items listed in the statistics of total wages in accordance with the regulations of the National Bureau of Statistics, including wages, bonuses, allowances, subsidies and other income. Therefore, my average monthly salary last year was a generalized salary, and the year-end bonus needs to be included in the social security payment base.

Those who are not included in the social security base may be ordered to pay back by the social security inspection.

Relevant provisions of "Social Insurance Law" on compulsory payment by employers;

Article 63 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.