How much does it cost to make up for 20 years of social security?

Legal analysis: the calculation formula of supplementary social security premium: social security supplementary base × social security supplementary proportion. When paying back social security, I will take the corresponding annual payment salary confirmed by myself as the base and multiply it by the ratio of the average salary of employees in this city in the previous year at the time of payment and the average salary of employees in this city in the previous year in the corresponding payment year (i.e. the payment coefficient) as the payment base of the corresponding payment year, and pay it according to the proportion of 20%.

Legal basis: Article 12 of the Social Insurance Law of People's Republic of China (PRC), the employing unit shall pay the basic old-age insurance premium in proportion to the total wages of its employees as 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.