Texas Local Government Code - LOC GOV'T § 152.035. Reimbursement for Mileage Expenses

(a) The commissioners court of a county may reimburse the county auditor for expenses incurred in traveling to and from the county seat in the auditor's personal automobile to perform official duties and to attend conferences and seminars relating to the performance of official duties. However, the commissioners court may not reimburse the auditor for expenses incurred in traveling between the auditor's personal residence and county office or for expenses incurred in any other travel of a personal nature.

(b) The commissioners court of a county with a population of 3.3 million or more may reimburse an assistant of a county auditor for the assistant's expenses that are the same kind as those for which the county auditor may be reimbursed under Subsection (a).

(c) The commissioners court by order shall set the reimbursement at a reasonable rate.

(d) Reimbursement shall be paid monthly on submission of a sworn expense report by the person seeking the reimbursement.