Texas Transportation Code - TRANSP § 451.555. Added Territory:  Effective Date of Taxes

(a) Except as provided by Subsection (b), a tax imposed by an authority takes effect in territory added to the authority when the addition takes effect.

(b) A sales and use tax imposed by an authority under Subchapter I takes effect in territory added to the authority under this subchapter on the first day of the first calendar quarter that begins after the date the comptroller receives:

(c) The presiding officer of the board shall send the order and map required under Subsection (b) to the comptroller by certified or registered mail.

(d) The order must include the effective date of the tax.

(e) The comptroller may delay implementation of the sales and use tax in the added territory for one calendar quarter by notifying the presiding officer of the board before the 11th day after the date the comptroller receives the order and map under this section that the comptroller requires more time.  If implementation is delayed, the tax takes effect on the first day of the second calendar quarter that begins after the date the comptroller receives the order and map.