Tex. Prop. Code § 61.004
The amount of the lien is the lesser of:
Added by Acts 1989, 71st Leg., ch. 171, Sec. 1, eff. Sept. 1, 1989.
Amended by Acts 1993, 73rd Leg., ch. 48, Sec. 11, eff. Sept. 1, 1993.