In which month was the social security deducted in that month paid?

Legal analysis: the social security department deducted in the current month. The salary paid by the work unit belongs to withholding, which can be decided by the unit in the current month or last month. Units generally increase their staff at the end of the month, declare payment at the beginning of the month, and deduct fees in the middle of the month.

Legal basis: Article 7 of People's Republic of China (PRC) Social Insurance Law. The administrative department of social insurance in the State Council is responsible for the national social insurance management, and other relevant departments in the State Council are responsible for the relevant social insurance work within their respective functions and duties. The social insurance administrative department of the local people's government at or above the county level shall be responsible for the social insurance management within its administrative area, and other relevant departments of the local people's government at or above the county level shall be responsible for the relevant social insurance work within their respective functions and duties.