Tex. Insurance Code - Not Codified § 5.34

(a) The Board shall have authority after having given reasonable notice, not exceeding thirty (30) days, of its intention to do so, to alter, amend or revise any rates of premium fixed and determined by it in any schedules of such rates promulgated by it, and to give reasonable notice of such alteration, amendment or revision to the public, or to any company or companies affected thereby. Such altered, amended or revised rates shall be the rates thereafter to be charged and collected by all fire insurance companies affected by this subchapter. No policy in force prior to the taking effect of such changes or amendments shall be affected thereby, unless there shall be a change in the hazard of the risk, necessitating a change in the rate applicable to such risk, in which event such policy shall be subject to the new rates.

(b) Notwithstanding Subsection (a) of this article, on and after the effective date of S.B. No. 14, Acts of the 78th Legislature, Regular Session, 2003, rates for homeowners and residential fire and residential allied lines insurance coverage under this subchapter are determined as provided by Subchapter Q of this chapter, and rates for other lines of insurance subject to this subchapter are determined as provided by Article 5.13-2 of this code, except that on and after December 1, 2004, rates for all lines of insurance subject to this subchapter are determined as provided by Article 5.13-2 of this code.