Any employee who withdraws from service after completion of at least 10 years of service but before age 55 shall be entitled to a refund upon request, provided such request is made before he attains such age.
Any employee who withdraws from service on or after age 60 with less than 5 years of service may elect to receive either a refund or an annuity.
The refund shall consist of the accumulation from employee contributions for service annuity, annual increase in basic retirement annuity, surviving spouse's service annuity, and interest deficiency, if any, without interest for employee contributions for the period on and after August 1, 1947. For the period prior to August 1, 1947, the refund of employee contributions shall be improved by interest at 4% per annum only. Contributions by the employer for military or naval service shall not be included in any refund but shall be considered for all other purposes of this Article except service for disability benefits. Credits in lieu of salary deductions during ordinary disability or duty disability shall be refundable.
Probate of the estate of an employee may be waived when and in the manner provided by statute. Payment to the person appointed by a court of competent jurisdiction to administer the testate or intestate estate of a deceased employee or employee annuitant, or to the person filing a small estate affidavit as prescribed by law, shall be a complete discharge of the board's obligations under this Article.
The board may at its discretion defer payment of refunds for a period not to exceed one year. If at the end of the year suit is pending to determine the employee's right to retain his or her former position, payment of refunds shall be suspended until final disposition of the suit.
Any employee who receives a refund shall forfeit all rights to annuity for himself or herself and for any one who may have any right to annuity through him or her, and credit for service rendered by him or her before refund was made. If he or she re-enters service, his or her status shall be that of an employee who enters service for the first time but he or she may regain the credits so forfeited by fulfilling the requirements specified elsewhere in this Article.
The board is hereby authorized to write off on its books of account any pending claim subject to the provisions of this section which remains unpaid for 2 years or more from the date of death of the employee or annuitant; provided, however, that when a valid claim is subsequently filed to the satisfaction of the board in the case of any account so written off the amount shall be paid in the manner prescribed herein.
40 ILCS 5/12-147