All U.S. employers, including tax-exempt organizations that hire workers, must verify the employment and identity of all employees hired to work in the United States. Both the tax-exempt organization and the employee must complete the U.S. Citizenship and Immigration Services (USCIS) Employment Eligibility Verification" Form I-9. PDF Employers must maintain completed Forms I-9 in their files for three years after the date of hire or one year after the date employment ends, whichever is later. The form can be obtained from the IRS by calling 800-829-3676 or by visiting the USCIS Web site. EOs may contact the USCIS at 800-375-5283 for more information about employers’ responsibilities. Interactive training Learn more about the benefits, limitations and expectations of tax-exempt organizations by attending 10 courses at the online Small to Mid-Size Tax Exempt Organization Workshop. Return to Life Cycle of a Public Charity Return to Life Cycle of a Private Foundation Return to Life Cycle of a Social Welfare Organization Return to Life Cycle of a Labor Organization Return to Life Cycle of an Agricultural or Horticultural Organization Return to Life Cycle of a Business League (Trade Association)