Tex. Fin. Code § 346.101
(a) A revolving credit account may provide for interest on an account at an annual rate that does not exceed the greater of:
Acts 1997, 75th Leg., ch. 1008, Sec. 1, eff. Sept. 1, 1997.
Amended by Acts 1999, 76th Leg., ch. 1348, Sec. 1, eff. Sept. 1, 1999;
Acts 2003, 78th Leg., ch. 887, Sec. 2, eff. Sept. 1, 2003.