Why should social security be accrued one month in advance?

Usually it is withdrawn at the end of the month and paid next month. You can find it if you hand it in next month. There is no such thing as a month in advance. National policy doesn't say that either. You can ask the local social security bureau why it paid in advance.

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Social insurance refers to a social and economic system that provides income or compensation for people who lose their ability to work, are temporarily unemployed or suffer losses due to health reasons. The main items of social insurance include endowment insurance, medical insurance, unemployment insurance, industrial injury insurance and maternity insurance. The social insurance plan is organized by the government, forcing a certain group to use part of its income as social insurance tax (fee) to form a social insurance fund. Under certain conditions, the insured can get fixed income or loss compensation from the fund. It is a redistribution system, and its goal is to ensure the reproduction of material and labor and social stability.