(a) The filing of a return with the director of taxation under article 15, 32, 33, 34, 36, 37, 41, 42 or 47 ofchapter 79 of the Kansas Statutes Annotated, and amendments thereto, shall not be deemed an application for an order under the Kansas administrative procedure act.

(b) A determination by the division of taxation or the audit services bureau of the department of revenue concerning tax liability under article 15, 32, 33, 34, 36, 37, 41, 42 or 47 ofchapter 79 of the Kansas Statutes Annotated, and amendments thereto, which is made prior to the opportunity for a hearing or prior to the opportunity for an informal conference before the secretary or the secretary’s designee on such tax liability, shall not require an adjudicative proceeding under the Kansas administrative procedure act.

(c) For purposes of administrative proceedings of the division of taxation under the Kansas administrative procedure act, the secretary of revenue may designate the director of the division of taxation as agency head.

(d) Final orders of the director of taxation pursuant to Kan. Stat. Ann. § 77-526, and amendments thereto, shall be rendered in writing and served within 120 days after conclusion of the hearing or after submission of proposed findings in accordance with subsection (f) of Kan. Stat. Ann. § 77-526, and amendments thereto, unless this period is waived or extended with the written consent of all parties or for good cause shown. If extended for good cause, such good cause shall be set forth in writing on or before the expiration of the 120 days.