If you are applying as an individual, you are required to provide your Social Security Number( SSN ), under s.342.06( 1 )( eg ) Wis. Stats. If you have a WI driver license, you may provide that number instead of your SSN. Under the Social Security Act,42 USCs. 405, (c)( 2 )( C )( i ), the department and other state and federal agencies may use the SSN for purposes authorized by law.