What is the effect of automatic revocation on an organization? An organization that has lost its tax-exempt status through automatic revocation may be required to file one of the following federal income tax returns and pay any applicable income taxes: Form 1120, U.S. Corporation Income Tax ReturnPDF, due by the 15th day of the 3rd month after the end of an organization’s tax year, or Form 1041, U.S. Income Tax Return for Estates and TrustsPDF, due by the 15th day of the 4th month after the end of an organization’s tax year. In addition, a section 501(c)(3) organization that loses its tax-exempt status cannot receive tax-deductible contributions and will not be identified in the IRS Business Master File extract as eligible to receive tax-deductible contributions, or be included in Tax Exempt Organization Search. To have its tax-exempt status reinstated, the organization must file an application for exemption. An organization may also request retroactive reinstatement as part of its application.