Tex. Tax Code § 26.043

(a) In the tax year in which a city has set an election on the question of whether to impose a local sales and use tax under Subchapter H, Chapter 453, Transportation Code, the officer or employee designated to make the calculations provided by Section 26.04 may not make those calculations until the outcome of the election is determined. If the election is determined in favor of the imposition of the tax, the designated officer or employee shall subtract from the city's voter-approval and no-new-revenue tax rates the amount that, if applied to the city's current total value, would impose an amount equal to the amount of property taxes budgeted in the current tax year to pay for expenses related to mass transit services.

(b) In a tax year to which this section applies, a reference in this chapter to the city's no-new-revenue or voter-approval tax rate refers to that rate as adjusted under this section.

(c) For the purposes of this section, "mass transit services" does not include the construction, reconstruction, or general maintenance of municipal streets.