Tex. Gov't Code § 660.018
Current with legislation from the 2023 Regular and Special Sessions signed by the Governor as of November 21, 2023.
A state employee may not accept a reimbursement or advance for a travel expense from more than one source. A state employee who anticipates receiving or actually receives a reimbursement or advance for a travel expense from a person other than a state agency may seek an advance or reimbursement for the expense from a state agency only to the extent that the amount of the employee's advance or reimbursement from the other source is less than the amount of the total expense incurred.
Tex. Gov't. Code § 660.018