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How to calculate the average monthly salary of employees in Beijing social security every year? Can I declare with a digital certificate?

The average monthly salary is declared in April every year. The average monthly salary is the average salary of employees in the previous year, and some units are based on a standard ~ ~ from March to March every year, you can declare it by logging in with a digital certificate; When reporting the average monthly salary, there will be the name of the employee. Just change the corresponding salary later, and then submit it ~ ~