Texas constitution
Article 8: taxation and revenue
Section 21

(c) The legislature by general law shall require that, subject to reasonable exceptions, a property owner be given notice of a revaluation of his property and a reasonable estimate of the amount of taxes that would be imposed on his property if the total amount of property taxes for the subdivision were not increased according to any law enacted pursuant to Subsection (a) of this section. The notice must be given before the procedures required in Subsection (a) are instituted.