Is social security paid a month in advance?

Generally there is no deduction of a month in advance.

1:The time for social security, is based on the unit to handle the recruitment of time to pay

In short: If the unit in October to help you handle the recruitment, even if it is 10/30 to help you handle the recruitment, is equal to the completion of social security in October.

2: When the completion of social security, for example, in October for the completion of social security, then the company will be in early November to receive the October social security bill, the company will be paid in November to complete the October social security.

3:Because the social security has been processed in October, then the social security in October will be deducted from the October salary.