35 ILCS 620/12
The Department may make, promulgate and enforce such reasonable rules and regulations relating to the administration and enforcement of this Act as may be deemed expedient.
Whenever notice to a taxpayer is required by this Act, such notice may be given by United States certified or registered mail, addressed to the taxpayer concerned at his or her last known address, and proof of such mailing shall be sufficient for the purposes of this Act. In the case of a notice of hearing, such notice shall be mailed not less than 7 days prior to the day fixed for the hearing.
All hearings provided for in this Act with respect to a taxpayer having his or her principal place of business in any of the several counties of this State shall be held in the county wherein the taxpayer has his or her principal place of business. If the taxpayer does not have his or her principal place of business in this State, such hearings shall be held in Sangamon County.
Notwithstanding any other provision of law, all hearings held before the Illinois Independent Tax Tribunal shall be held in accordance with the Illinois Independent Tax Tribunal Act of 2012.
Except with respect to matters under the jurisdiction of the Illinois Independent Tax Tribunal, the Circuit Court of the county wherein a hearing is held shall have power to review all final administrative decisions of the Department in administering this Act. If, however, the administrative proceeding which is to be reviewed judicially is a claim for refund proceeding commenced in accordance with Section 6 of this Act and Section 2a of "An Act in relation to the payment and disposition of moneys received by officers and employees of the State of Illinois by virtue of their office or employment", approved June 9, 1911, as amended, the Circuit Court having jurisdiction of the action for judicial review under this Section and under the Administrative Review Law, as amended, shall be the same court that entered the temporary restraining order or preliminary injunction which is provided for in Section 2a of "An Act in relation to the payment and disposition of moneys received by officers and employees of the State of Illinois by virtue of their office or employment", and which enables such claim proceeding to be processed and disposed of as a claim for refund proceeding rather than as a claim for credit proceeding.
Except as otherwise provided in this Section, the provisions of the Administrative Review Law, and the rules adopted pursuant thereto, shall apply to and govern all proceedings for the judicial review of final administrative decisions of the Department under this Act. The term "administrative decision" is defined as in Section 3-101 of the Code of Civil Procedure.
Notwithstanding any other provision of law, the provisions of the Illinois Independent Tax Tribunal Act of 2012, and the rules adopted pursuant thereto, shall apply to and govern judicial review of final administrative decisions that are subject to the Illinois Independent Tax Tribunal Act of 2012.
Service upon the Director or Assistant Director of the Department of Revenue of summons issued in any action to review a final administrative decision is service upon the Department. The Department shall certify the record of its proceedings if the taxpayer pays to it the sum of 75 per page of testimony taken before the Department and 25 per page of all other matters contained in such record, except that these charges may be waived where the Department is satisfied that the aggrieved party is a poor person who cannot afford to pay such charges.
Whenever any proceeding provided by this Act is begun by the Department or by a person subject thereto and such person thereafter dies or becomes a person under legal disability before such proceeding is concluded, the legal representative of the deceased or the person under legal disability shall notify the Department of such death or legal disability. Such legal representative, as such, shall then be substituted by the Department for such person. Within 20 days after notice to the legal representative of the time fixed for that purpose, the proceeding may go forward in all respects and with like effect as though the person had not died or become a person under legal disability.
35 ILCS 620/12