All US employers must properly complete Form I9 for every individual they hire for employment in the United States. This includes citizens and noncitizens.This service offers fast, free, and secure online W-2 filing options to CPAs, accountants, enrolled agents, and individuals who process W-2s. Legitimate employers will require you to provide both your SSN and a photo ID when they fill out the I9 form. On-Campus Employer Letter. Share the On-Campus Employer Letter link with your supervisor who will complete and sign the fillable form. Worker's Social Security Claim Number. Name of employed or self-employed beneficiary. Complete the Social Security related questions on the Form I-765, an application form you must submit to the US government for your employment application. If the employee did provide an SSN in Section 1, then: Complete a new Form I9.