The calculation formula of monthly social security premium is as follows: unit contribution amount = unit social security contribution ratio multiplied by unit social security contribution base = individual social security contribution ratio multiplied by individual social security contribution base. Generally speaking, the contribution ratio of social security units and individuals is as follows: 1, endowment insurance: 20% for units and 8% for individuals; 2. Medical insurance: the unit pays 8% and the individual pays 2%; 3. Unemployment insurance: 2% for the unit and 0/%for the individual.

Legal objectivity:

Article 12 of the full text of the Social Insurance Law of People's Republic of China (PRC) * * * The employer shall pay the basic old-age insurance premium according to the proportion of the total wages of employees stipulated by the state and record it in the basic old-age insurance pooling fund. Employees shall pay the basic old-age insurance premium in accordance with the proportion of wages stipulated by the state and record it in their personal accounts. Individual industrial and commercial households without employees, part-time employees who have not participated in the basic old-age insurance in the employing unit and other flexible employees who have participated in the basic old-age insurance shall pay the basic old-age insurance premiums in accordance with state regulations and record them in the basic old-age insurance pooling fund and individual accounts respectively.