Tex. Fin. Code § 348.109
A retail installment contract may not authorize the holder to accelerate the maturity of all or a part of the amount owed under the contract unless:
Acts 1997, 75th Leg., ch. 1008, Sec. 1, eff. Sept. 1, 1997.
Acts 2009, 81st Leg., R.S., Ch. 238 (S.B. 1965), Sec. 9, eff. September 1, 2009.
Acts 2011, 82nd Leg., R.S., Ch. 117 (H.B. 2559), Sec. 13, eff. September 1, 2011.