Form I-9 is a document used by employers in the United States to verify the identity and employment authorization of individuals hired for employment in the country. All employers are required to complete and retain a Form I-9 for each employee they hire in order to comply with federal immigration laws. The form requires the employer to examine the employee's identity and employment authorization documents and record the information on the form. The employee must also complete and sign the form to attest to their work authorization. Form I-9 is administered by the U.S. Citizenship and Immigration Services (USCIS).