(a) The board of trustees is authorized, but not required, to deduct from benefit payments the membership dues of any nonprofit organization domiciled in Georgia which requests such deductions, provided that at least 30 percent of the retired members of this retirement system belong to such organization and members of the organization request that such deduction be made as provided in subsection (b) of this Code section.

(b) Any retired member desiring the deduction provided for in subsection (a) of this Code section must so notify the board of trustees in writing in the manner specified by the board of trustees. Once begun, any such deduction may be canceled only by a request to the board of trustees in writing in a manner specified by the board of trustees.

(c) Any organization for which membership dues deductions are made as provided in this Code section shall reimburse this retirement system for the actual cost of making such deductions.

(d) Any organization requesting the deductions provided in subsection (a) of this Code section shall reimburse this retirement system for the actual cost of determining if such organization is eligible as provided in subsection (a) of this Code section.

(e) In the event a dispute arises regarding deductions provided in subsection (a) of this Code section, this retirement system shall not be liable to any party in any manner, and the matter shall be settled between the retired member and the organization involved.