(a) The adoption of the tax or the change in the rate of the tax takes effect on the first day of the first calendar quarter occurring after the expiration of the first complete calendar quarter occurring after the date on which the comptroller receives notice of the results of the election.
(b) If the comptroller determines that an effective date provided by Subsection (a) will occur before the comptroller can reasonably take the action required to begin collecting the tax, the effective date may be extended by the comptroller until the first day of the next succeeding calendar quarter.
Official text of the Texas Tax Code as published by the Texas Legislative Council.