According to Zhejiang People's Social Development [202 1] No.54, the social security payment base of 2021was started in Hangzhou (excluding Lin 'an District). The latest payment base is 79 133 yuan according to the average salary of employees in all social units in Zhejiang province in 2020. The upper limit of monthly payment base is 19783 yuan, and the lower limit of monthly payment base is 60% of temporary average salary, that is, 3957 yuan. Flexible employees and individual industrial and commercial households (excluding individual industrial and commercial households participating in the basic old-age insurance for employees in Hangzhou), the monthly payment amount = monthly payment base × payment ratio, and the monthly payment base is selected by the insured according to 60%-300% of 79 133 yuan/month (the weighted average monthly salary of non-private and private employees in Zhejiang Province in 2020), and the payment ratio is 65,430.