(a) A school district employee is entitled to have an amount deducted from the employee's salary for membership fees or dues to a professional organization or an entity providing services to classroom teachers under Section 21.417. The employee must:
(1) file with the district a signed written request identifying the organization or entity; and
(2) inform the district of the total amount of the fees and dues for each year or have the organization or entity notify the district of the amount.
(b) The district shall deduct the total amount of the fees or dues for a year in equal amounts per pay period. The district shall notify the employee not later than the 45th day after the district receives a request under Subsection (a) of the number of pay periods annually from which the district will deduct the fees or dues. The deductions shall be made until the employee requests in writing that the deductions be discontinued.
(c) The school district may charge an administrative fee for making the deduction. A fee imposed for making a salary deduction under this section may not exceed either the actual administrative cost of making the deduction or the lowest fee the district charges for similar salary deductions, whichever is less.