Ed. Code, § 45061

The governing board of each school district when drawing an order for the salary or wage payment due to a certificated employee of the district shall, with or without charge, reduce the order for the payment of service fees to the certified or recognized organization as required by an organizational security arrangement between the exclusive representative and a public school employer as provided under Chapter 10.7 (commencing with Section 3540) of Division 4 of Title 1 of the Government Code. However, the organizational security arrangement shall provide that any employee may pay service fees directly to the certified or recognized employee organization in lieu of having such service fees deducted from the salary or wage order.

If the employees of a district do not authorize the board to make a deduction to pay their pro rata share of the costs of making deductions for the payment of service fees to the certificated or recognized organization, the board shall deduct from the amount transmitted to the organization on whose account the payments were deducted the actual costs, if any, of making the deduction. No charge shall exceed the actual cost to the district of the deduction. These actual costs shall be determined by the board and shall include startup and ongoing costs.