Texas Tax Code
Tex. Tax Code § 26.02 — ASSESSMENT RATIOS PROHIBITED
The assessment of property for taxation on the basis of a percentage of its appraised value is prohibited. All property shall be assessed on the basis of 100 percent of its appraised value. Acts 1979, 66th Leg., p. 2277, ch. 841, Sec. 1, eff. Jan. 1, 1981. Amended by Acts 1983, 68th Leg., p. 4827, ch. 851, Sec. 18, eff. Aug. 29, 1983.
Source: official text