Texas Local Government Code - LOC GOV'T § 334.084. Rate Increase

(a) A municipality that has adopted a sales and use tax under this subchapter at any rate, and a county that has adopted a sales and use tax under this subchapter at a rate of less than one-half of one percent, may by ordinance or order increase the rate of the tax if the increase is approved by a majority of the registered voters of that municipality or county voting at an election called and held for that purpose.

(b) The county tax may be increased under Subsection (a) in one or more increments of one-eighth of one percent to a maximum of one-half of one percent. The municipal tax may be increased under Subsection (a) in one or more increments of one-eighth of one percent to any rate that the municipality determines is appropriate and that would not result in a combined rate that exceeds the maximum combined rate prescribed by Section 321.101(f), Tax Code.

(c) The ballot for an election to increase the tax shall be printed to permit voting for or against the proposition: “The adoption of a sales and use tax for the purpose of financing _______ (insert description of venue project) at the rate of _______ percent (insert appropriate rate).”