Jobs With Social Security. How to File an Application for Employment.Not all forms are listed. Any line for social security number remaining on an Employment Certificate or Permit should be left blank or otherwise marked not applicable. Do not enter an Individual. Taxpayer Identification Number (ITIN) as your Social Security number. When you receive the worker's Social Security number, file Form W-2c (Corrected Wage and Tax Statement), to show the worker's number. At that time, you should simply complete a new Form I-9 with your updated SSN and original hire date. HOWEVER you are in no way obligated to provide your SSN if you feel the employer's request is unreasonable. In the First Name field.