Every employer required to file a return, statement, or other document must furnish the social security numbers of his employees as required by the forms. If you do not know the social security number of an employee, you must request the number from the employee and tell him that the social security number is required to be furnished by law.
If an employee lacks a social security number, use form SS-5 (Application for Social Security Card).
When filing the return, statement, or other document without an employee's social security number, you must sign an affidavit on the transmittal document stating that the number is unknown and that a request for that number was made of the employee.
