Tex. Gov't Code § 659.020
Current with legislation from the 2023 Regular and Special Sessions signed by the Governor as of November 21, 2023.
A state employee employed by a state agency as defined by Section 658.001 whose position is classified under Chapter 654 or whose exempt position is funded by the General Appropriations Act may not receive a salary supplement from any source unless a specific grant of authority to do so is provided by the General Appropriations Act or other law.
Tex. Gov't. Code § 659.020