To ensure that only individuals that are legally allowed to work get to work, the federal government mandates completing a Form I-9 for every new hire. The Immigration Reform and Control Act of 1986 (IRCA) requires employers to verify that the potential hire is allowed to work in the United States.
The I-9 is a federal form used to identify and verify eligibility for employment in US. The document is kept in-house by the employer in the employee’s file and attached should be photocopies of the employee’s identification/eligibility sources. This is a legal requirement for all employers.