Form I-9 is a federal document used to verify the identity and employment authorization of individuals hired to work in the United States. All employers are required to have new employees complete Form I-9 within three days of hire. The form requires employees to provide documentation, such as a passport, driver’s license, or Social Security card, to prove their eligibility to work. Employers must retain these forms and make them available for inspection by U.S. Immigration and Customs Enforcement (ICE) or other government agencies to ensure compliance with immigration laws.