(1) Except as provided in subsections (2), (3), and (4) of this section, the right of any person to a retirement allowance or optional retirement allowance under the provisions of this chapter and all moneys and investments and income thereof are exempt from any state, county, municipal, or other local tax and shall not be subject to execution, garnishment, attachment, the operation of bankruptcy or the insolvency laws, or other processes of law whatsoever whether the same be in actual possession of the person or be deposited or loaned and shall be unassignable except as herein specifically provided.
(2) Subsection (1) of this section shall not prohibit the department of retirement systems from complying with (a) a wage assignment order for child support issued pursuant to chapter
26.18 RCW, (b) a notice of payroll deduction issued under chapter
26.23 RCW, (c) an order to withhold and deliver issued pursuant to chapter
74.20A RCW, (d) a mandatory benefits assignment order issued pursuant to chapter
41.50 RCW, (e) a court order directing the department of retirement systems to pay benefits directly to an obligee under a dissolution order as defined in RCW
41.50.500(3) which fully complies with RCW
41.50.670 and
41.50.700, or (f) any administrative or court order expressly authorized by federal law.
(3) Subsection (1) of this section shall not be deemed to prohibit a beneficiary of a retirement allowance from authorizing deductions therefrom for payment of premiums due on any group insurance policy or plan issued for the benefit of a group comprised of public employees of the state of Washington.
(4) Deductions made in the past from retirement benefits are hereby expressly recognized, ratified, and affirmed. Future deductions may only be made in accordance with this section.