Definition
Form I-9, Employment Eligibility Verification, is required for every new employee in the United States, citizen or not. The worker completes Section 1 no later than the first day of work. The employer reviews original documents from the lists of acceptable documents and completes Section 2 within three business days of the start date. The employee chooses which acceptable documents to present. Employers keep I-9s for a set period and must make them available for inspection. When an agency employs you on W-2, the agency completes your I-9.
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This definition is general information, not legal, tax or financial advice. Rules vary by state and change over time.