Tex. Labor Code § 506.001: LATE PAYMENT OF JUDGMENT BY THE STATE.

(a) In a workers' compensation case in which a claimant is awarded a judgment against the state or a political subdivision of the state under Chapter 501, 502, 503, 504, or 505, the state or political subdivision shall comply with the judgment not later than the 30th day after the judgment is entered.

(b) If the state or a political subdivision of the state fails or refuses to comply with a judgment as provided under Subsection (a) and the claimant secures a mandamus order against the state or political subdivision to force compliance with the judgment, the claimant is also entitled to an award of:

(1) a penalty of 12 percent of the amount of compensation recovered in the judgment; and

(2) reasonable attorney's fees for prosecution of the mandamus action.

Acts 1993, 73rd Leg., ch. 269, Sec. 1, eff. Sept. 1, 1993.