Texas Education Code - EDUC § 13.006. Taxing Authority Transfer

(a) If all or part of the territory of a school district is annexed to another district, the receiving district may levy taxes at the rate established in accordance with law for the district as a whole and is not required to conduct an election for the purpose of taxing the territory received.

(b) Conversion of a common school district or rural high school district to an independent school district or separation from municipal control does not affect the taxes levied for school purposes.  The new district may levy and collect taxes at the same rate at which the taxes were previously levied and is not required to conduct an election for that purpose.