(a) The rate of assessment set by the commissioner may not exceed 1.25 percent of the gross premiums subject to taxation under Section 252.003.
(b) The commissioner shall annually adjust the rate of assessment of the maintenance tax so that the tax imposed that year, together with any unexpended funds produced by the tax, produces the amount the commissioner determines is necessary to pay the expenses during the succeeding year of regulating all classes of insurance specified under:
(1) Chapters 1807, 2001-2006, 2171, 6001, 6002, and 6003;
(2) Subchapter C, Chapter 5;
(3) Subchapter H, Chapter 544;
(4) Subchapter D, Chapter 1806;
(5) Section 403.002;
(6) Sections 417.007, 417.008, and 417.009, Government Code; and
(7) Chapter 2154, Occupations Code.