Tex. Loc. Gov't Code § 505.259
For a tax under this subchapter at a rate that does not exceed one-half of one percent, the election requirement under Section 505.251 is satisfied and another election is not required if the voters of the authorizing municipality approved the imposition of an additional one-half cent sales and use tax at an election held before March 28, 1991, under an ordinance calling the election that:
Added by Acts 2007, 80th Leg., R.S., Ch. 885 (H.B. 2278), Sec. 3.01, eff. April 1, 2009.
Acts 2015, 84th Leg., R.S., Ch. 1246 (H.B. 157), Sec. 11, eff. September 1, 2015.