When does Shanghai Social Security deduct the fee every month?

At the beginning of the month (7th) and the end of the month (20th).

Shanghai Social Security will deduct the fees on the 7th and 20th of each month. Deduction at the beginning of each month is successful and full, and will not be repeated at the end of each month. If the social security payment is not successful or fully completed at the beginning of a month, it will be paid on the last working day of the current period, that is, the corresponding date before the payment in my account.