Must social security be paid in the unit where the tax collector's card is hung now?

Social security can be paid in unit A, which is determined according to the labor relationship and file relationship, no matter which unit the tax collector's card is hung in.

However, if you handle the tax of Company A, your tax collector's certificate will still be transferred to Company A. 。

Unit A doesn't need a tax collector's card, so it doesn't need to transfer.