Except as set forth in subsections (a-1) and (a-2), the refund shall be the sum of the accumulated normal, additional, and survivors insurance contributions, plus the entire contribution made by the participant under Section 15-113.3, less the amount of interest credited on these contributions each year in excess of 4 1/2% of the amount on which interest was calculated.
may make a one-time, irrevocable election to repay the refund or additional annuity payments received under subsection (c), together with compound interest thereon at the actuarially assumed rate of return from the date the refund was issued or the date each additional annuity payment was issued to the date of repayment. The annuitant shall submit proof of party status for item (1), (2), or (3) in the form of a valid marriage certificate or a civil union certificate with any additional requirements the Board prescribes by rulemaking. The election must be received by the System (i) within a period of one year beginning 5 months after the effective date of this amendatory Act of the 99th General Assembly and (ii) prior to the date of death of the annuitant.
To the extent permitted under the Internal Revenue Code of 1986, as amended, the full repayment shall be made within a period beginning on the date of the election and ending on the earlier of the 24th month thereafter or the date of the annuitant's death. If an annuitant fails to make the repayment within the required period, any payments made shall be returned, without interest, to the annuitant (or to the annuitant's estate if the payments ceased due to death), and survivors insurance benefits under Section 15-145 shall not be payable upon the annuitant's death.
Upon such repayment, all forfeited survivors insurance benefit rights and credits under Section 15-145 shall be restored. This repayment right shall not alter or modify any eligibility requirement for survivors insurance beneficiaries under this Article applicable upon the annuitant's death. The repayment shall be irrevocable. No person shall have a claim or right to the repaid amounts in a manner not otherwise provided for under this Article in the event that: the marriage, civil union, or other legal relationship described in this subsection is dissolved, annulled, or declared invalid by a court of competent jurisdiction; or the other party to the marriage, civil union, or other legal relationship predeceases the annuitant or otherwise fails to qualify as a survivors insurance beneficiary upon the annuitant's death.
For purposes of this subsection (c-5), the term "annuitant" shall include an annuitant who resumed his or her status as a participating employee under Section 15-139(c).
40 ILCS 5/15-154