(a) The Commissioner of Revenue Services shall administer and enforce the tax imposed under this chapter and is authorized to adopt regulations and to require such facts and information to be reported as may be necessary to enforce the provisions of this chapter.

(b) The commissioner may prescribe the form and contents of any return or other document required to be filed under this chapter.

(c) The commissioner may adopt regulations as to the keeping of records, the content and form of returns and statements and the filing of copies of federal income tax returns and determinations. The commissioner may require any person, by regulation or notice served on such person, to make such returns, render such statements or keep such records as the commissioner may deem sufficient to show whether or not such person is liable under this chapter for tax or for the collection of tax.

(d) The commissioner or any person authorized by him may examine the books, papers, records and equipment of any person liable under the provisions of this chapter and may investigate the activities of the person in order to verify the accuracy of any return made, or, if no return is made by the person, to ascertain and determine the amount required to be paid.

(e) The commissioner and any representative of the commissioner authorized to conduct any inquiry, investigation or hearing under this chapter may administer oaths and take testimony under oath relative to the matter of inquiry or investigation. At any hearing ordered by the commissioner, the commissioner or his representative authorized to conduct such hearing and to issue such process may subpoena witnesses and require the production of books, papers and documents pertinent to such inquiry. No witness under subpoena authorized to be issued by the provisions of this chapter shall be excused from testifying or from producing books or other documentary evidence on the grounds that the production of such books or other documentary evidence would tend to incriminate him, but such evidence or the books or documentary evidence so produced shall not be used in any criminal proceeding against him. If any person disobeys such process or, having appeared in obedience thereto, refuses to answer any pertinent question put to him by the commissioner or his authorized representative, or to produce any books and other documentary evidence pursuant thereto, the commissioner or such representative may apply to the superior court for the judicial district wherein the taxpayer resides or to any judge of said court if the same is not in session, setting forth such disobedience to process or refusal to answer, and said court or such judge shall cite such person to appear before said court or such judge to answer such question or to produce such books and other documentary evidence and, upon his refusal so to do, shall commit such person to a community correctional center until he testifies, but not for a longer period than sixty days. Notwithstanding the serving of the term of such commitment by any person, the commissioner may proceed in all respects with such inquiry and examination as if the witness had not previously been called upon to testify. Officers who serve subpoenas issued by the commissioner or under his authority and witnesses attending hearings conducted by him hereunder shall receive fees and compensation at the same rates as officers and witnesses in the courts of this state, to be paid on vouchers of the commissioner on order of the Comptroller from the appropriation for the administration of this chapter.