Tax-exempt organizations are generally required to have and use an employer identification number (EIN). Tax-exempt organizations must use their EIN if required to file employment tax returns or give tax statements to employees or annuitants. (Note: The tax-exempt organization should have only one EIN. Once the organization receives an EIN, the organization will use it from one year to the next.) Return to Life Cycle of a Public CharityReturn to Life Cycle of a Private FoundationReturn to Life Cycle of a Social Welfare OrganizationReturn to Life Cycle of a Labor OrganizationReturn to Life Cycle of an Agricultural or Horticultural OrganizationReturn to Life Cycle of a Business League (Trade Association)