Social security is based on basic salary.

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In fact, the payment base of the social security fund is not based on the basic salary or actual salary, but on the average monthly salary of local employees published by the local labor and social security bureau every year (from the lowest standard to the highest standard). Then, when the personnel of the human resources management department of your work unit go to the social security center to inquire about the payment base of the employees of this unit every year, refer to your actual salary and choose a standard as your pension insurance payment base within the payment base, which is generally close to your actual salary.