Tax information authorization.
(15) Tax information authorization. A document signed by the taxpayer authorizing any individual or entity (e.g., corporation, partnership, trust or organization) designated by the taxpayer to receive and/or inspect confidential tax information in a specified matter. (See section 6103 of the Internal Revenue Code and the regulations thereunder.)
26 CFR § 601.501
Scope of rules. The rules prescribed in this subpart concern, among other things, the representation of taxpayers before the Internal Revenue Service under the authority of a power of attorney. These rules apply to all offices of the Internal Revenue Service in all matters under the jurisdiction of the Internal Revenue Service and apply to practice before the Internal Revenue Service (as defined in 31 CFR 10.2(a) and 10.7(a)(7). For special provisions relating to alcohol, tobacco, and firearms activities, see 601.521 through 601.527. These rules detail the means by which a recognized representative is authorized to act on behalf of a taxpayer. Such authority must be evidenced by a power of attorney and declaration of representative filed with the appropriate office of the Internal Revenue Service. In general, a power of attorney must contain certain information concerning the taxpayer, the recognized representative, and the specific tax matter(s) for which the recognized representative is authorized to act. (See 601.503(a).) A declaration of representative is a written statement made by a recognized representative that he/she is currently eligible to practice before the Internal Revenue Service and is authorized to represent the particular party on whose behalf he/she acts. (See 601.502(c).)