Section 12-1a - Department of Revenue Services. Commissioner. Successor department to state Tax Department(a) There shall be a Department of Revenue Services. The department shall be under the direction of the Commissioner of Revenue Services, who shall be appointed by the Governor in accordance with the provisions of sections 4-5, 4-6, 4-7, 4-8, with the powers and duties therein prescribed.(b) The Department of Revenue Services shall constitute a successor department to the state Tax Department in accordance with the provisions of section 4-38d and section 4-39.(P.A. 77-614, S. 138, 610.)