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 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 (yrade association)