At issue: Whether the state Complementary Law (LC) 1.089/2021, initiated by the State Governor, is unconstitutional, questioning in particular: (i) art. 1º, caput, and its paragraphs 1º and 2º; (ii) art. 2º, caput and paragraphs 1º and 2º; (iii) art. 15, caput and sole paragraph; (iv) art. 17, caput and its items; and (v) Annexes I, II, V, VI, VII and VII.