Government Code §26.006

(a) A county judge is entitled to an annual salary supplement from the state in an amount equal to 18 percent of the annual compensation provided for a district judge in the General Appropriations Act if at least 40 percent of the functions that the judge performs are judicial functions. (b) To receive a supplement under Subsection (a), a county judge must file with the comptroller's judiciary section an affidavit stating that at least 40 percent of the functions that the judge performs are judicial functions. (c) The commissioners court in a county with a county judge who is entitled to receive a salary supplement under this section may not reduce the county funds provided for the salary or office of the county judge as a result of the salary supplement required by this section.