(1) Section 501(a) provides an exemption from income taxes for organizations which are described in section 501 (c) or (d) and section 401(a), unless such organization is a feeder organization (see section 502), or unless it engages in a transaction described in section 503. However, the exemption does not extend to unrelated business taxable income of such an organization (see part III (Section 511 and following), subchapter F, chapter 1 of the Code).

(2) An organization, other than an employees' trust described in section 401(a), is not exempt from tax merely because it is not organized and operated for profit. In order to establish its exemption, it is necessary that every such organization claiming exemption file an application form as set forth below with the district director for the internal revenue district in which is located the principal place of business or principal office of the organization. Subject only to the Commissioner's inherent power to revoke rulings because of a change in the law or regulations or for other good cause, an organization that has been determined by the Commissioner or the district director to be exempt under section 501(a) or the corresponding provision of prior law may rely upon such determination so long as there are no substantial changes in the organization's character, purposes, or methods of operation. An organization which has been determined to be exempt under the provisions of the Internal Revenue Code of 1939 or prior law is not required to secure a new determination of exemption merely because of the enactment of the Internal Revenue Code of 1954 unless affected by substantive changes in law made by such Code.

(3) An organization claiming exemption under section 501(a) and described in any paragraph of section 501(c) (other than section 501(c)(1) shall file the form of application prescribed by the Commissioner and shall include thereon such information as required by such form and the instructions issued with respect thereto. For rules relating to the obtaining of a determination of exempt status by an employees' trust described in section 401(a), see the regulations under section 401.

(1) Organizations mentioned below shall submit with and as a part of their applications the following information:

(2) In addition to the information specifically called for by this section, the Commissioner may require any additional information deemed necessary for a proper determination of whether a particular organization is exempt under section 501(a), and when deemed advisable in the interest of an efficient administration of the internal revenue laws, he may in the cases of particular types of organizations prescribe the form in which the proof of exemption shall be furnished.

(3) An organization claiming to be specifically exempted by section 6033(a) from filing annual returns shall submit with and as a part of its application a statement of all the facts on which it bases its claim.