Texas Government Code - GOV'T § 659.018. Compensatory Time:  Place Where Work Performed

(a) Except under circumstances specified in the General Appropriations Act or as provided by Subsection (b), an employee of a state agency as defined by Section 658.001 may not, for hours worked during any calendar week, accumulate compensatory time off under Section 659.015(f) or 659.016 to the extent that the hours are attributable to work performed at a location other than the employee's regular or temporarily assigned place of employment.

(b) An employee may accumulate compensatory time off for hours worked during any calendar week at the employee's personal residence if the employee obtains the advance approval of the administrative head of the agency for which the employee works or that person's designee.