The creditable service established under this Section may be used for all purposes under this Article and the Retirement Systems Reciprocal Act, except for the computation of highest average annual salary under Section 12-133 or the determination of salary under this or any other Article of this Code.
If a person who retires dies before all payments of the employee contribution have been made, the remaining payments shall be deducted from any survivor or death benefits payable to the employee's surviving spouse or beneficiary.
Notwithstanding any provision in this Article to the contrary, all employee contributions paid under this Section shall not be deemed employee contributions for the purpose of determining the tax levy under Section 12-149. Notwithstanding any provision in this Article to the contrary, the employer shall not make a contribution for any credit established by an employee under subsection (b) of this Section. Employee contributions made under this Section may be refunded under the same terms and conditions as other employee contributions under this Article.
40 ILCS 5/12-133.6