What federal form is used to verify a potential employee's eligibility to work in the United States?

The I-9 form is the correct form used to verify a potential employee's eligibility to work in the United States. This form, officially known as the Employment Eligibility Verification form, is required by the U.S. Citizenship and Immigration Services (USCIS) for all employees hired after November 6, 1986. Employers must complete the form to confirm that the employee has the legal right to work in the U.S. This involves providing identification and documentation that establishes both identity and employment authorization.

Other forms listed have different purposes and do not serve to verify eligibility for employment. The W-2 form is used by employers to report wages paid to employees and the taxes withheld. The 1040 form is an individual income tax return form used by U.S. taxpayers to report their annual income. The SS-5 form is an application for a Social Security card, which is not specifically tied to employment eligibility verification. Thus, the I-9 form stands out as the essential document for ensuring compliance with U.S. immigration law regarding employment.