Rev. Rul. 58-617

Rulings and determinations letters granting exemption from Federal income tax to an organization described in section 501(a) of the Internal Revenue Code of 1954, to which contributions are deductible by donors in computing their taxable income in the manner and to the extent provided by section 170 of the Code, are effective only so long as there are no material changes in the character of the organization, the purposes for which it was organized, or its methods of operation. The District Director of Internal Revenue for the district in which the organization is located must be advised immediately of any such changes in order that a determination may be made as to the effect the changes may have upon the exempt status of the organization. See generally sections 1.501(a)-1 and 1.6033-1 of the Income Tax Regulations. Failure to comply with this requirement may result in serious consequences to the organization for the reason that the ruling or determination letter holding the organization exempt may be revoked retroactively to the date of the changes affecting its exempt status, depending upon the circumstances involved, and subject to the limitations on retroactivity of revocation found in section 503 of the Code.