If your employer used the wrong SSN the employer has to correct that and issue a corrected W-2 (a W-2C) so that the correct information goes to the IRS and to Social Security ---this affects your future Social Security benefits as well as your income tax---so make sure the employer corrects it.
Did YOU use the right Social Security number on your own tax return that you filed?
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**