If a taxing unit adopts, amends, or repeals an exemption that the unit by law has the option to adopt or not, the taxing unit shall notify the appraisal office of its action and of the terms of the exemption within 30 days after the date of its action. Acts 1979, 66th Leg., p. 2227, ch. 841, Sec. 1, eff. Jan. 1, 1980.
Texas Legal Code