31 C.F.R. § 10.7 : Money and Finance: Treasury — OFFICE OF THE SECRETARY OF THE TREASURY — PRACTICE BEFORE THE INTERNAL REVENUE SERVICE — RULES GOVERNING AUTHORITY TO PRACTICE — Representing oneself; participating in rulemaking; limited practice; and special appearances

(a) Representing oneself. Individuals may appear on their own behalf before the Internal Revenue Service provided they present satisfactory identification.
(b) Participating in rulemaking. Individuals may participate in rulemaking as provided by the Administrative Procedure Act. See 5 U.S.C. 553.
(c) Limited practice -
(1) In general. Subject to the limitations in paragraph (c)(2) of this section, an individual who is not a practitioner may represent a taxpayer before the Internal Revenue Service in the circumstances described in this paragraph (c)(1), even if the taxpayer is not present, provided the individual presents satisfactory identification and proof of his or her authority to represent the taxpayer. The circumstances described in this paragraph (c)(1) are as follows:
(i) An individual may represent a member of his or her immediate family.
(ii) A regular full-time employee of an individual employer may represent the employer.
(iii) A general partner or a regular full-time employee of a partnership may represent the partnership.
(iv) A bona fide officer or a regular full-time employee of a corporation (including a parent, subsidiary, or other affiliated corporation), association, or organized group may represent the corporation, association, or organized group.
(v) A regular full-time employee of a trust, receivership, guardianship, or estate may represent the trust, receivership, guardianship, or estate.
(vi) An officer or a regular employee of a governmental unit, agency, or authority may represent the governmental unit, agency, or authority in the course of his or her official duties.
(vii) An individual may represent any individual or entity, who is outside the United States, before personnel of the Internal Revenue Service when such representation takes place outside the United States.
(2) Limitations.
(i) An individual who is under suspension or disbarment from practice before the Internal Revenue Service may not engage in limited practice before the Internal Revenue Service under paragraph (c)(1) of this section.
(ii) The Commissioner, or delegate, may, after notice and opportunity for a conference, deny eligibility to engage in limited practice before the Internal Revenue Service under paragraph (c)(1) of this section to any individual who has engaged in conduct that would justify a sanction under §10.50.
(iii) An individual who represents a taxpayer under the authority of paragraph (c)(1) of this section is subject, to the extent of his or her authority, to such rules of general applicability regarding standards of conduct and other matters as prescribed by the Internal Revenue Service.
(d) Special appearances. The Commissioner, or delegate, may, subject to conditions deemed appropriate, authorize an individual who is not otherwise eligible to practice before the Internal Revenue Service to represent another person in a particular matter.
(e) Fiduciaries. For purposes of this part, a fiduciary (for example, a trustee, receiver, guardian, personal representative, administrator, or executor) is considered to be the taxpayer and not a representative of the taxpayer.
(f) Effective/applicability date. This section is applicable beginning August 2, 2011.

31 C.F.R. § 10.7

T.D. 9011, 67 FR 48765, 7/26/2002, as amended by T.D. 9359, 72 FR 54544, 54547, 9/26/2007; T.D. 9527, 76 FR 32305, 6/3/2011