The Fund shall allow the annuitant to repay the total amount of the refund, plus interest, over a period not to exceed 24 months. To the extent permitted by the Internal Revenue Code of 1986, as amended, and for federal and State tax purposes, if a member pays in monthly installments by reducing the monthly annuity by the amount of the otherwise applicable contribution, the monthly amount by which the annuitant's benefit is reduced shall not be treated as a contribution by the annuitant, but rather as a reduction of the annuitant's monthly annuity. In the event of the death of the annuitant prior to repayment of the total amount of the refund, plus interest, the amount owed as of the date of death shall be deducted from the spouse annuity by a reduction in the surviving spouse's monthly annuity. The death of the spouse or civil union partner prior to the annuitant's death shall not void the election.
If a personal representative of the estate has not been appointed within 90 days from the date on which a refund became payable, the refund may be applied, in the discretion of the Board, toward the payment of the employee's or the surviving spouse's burial expenses. Any remaining balance shall be paid to the heirs of the employee according to the law of descent and distribution of the State of Illinois.
Whenever the total accumulations to the account of an employee from employee contributions other than the contribution for the cost of living increase, including interest to the employee's date of withdrawal, have not been paid to the employee and surviving spouse as a retirement or spouse's annuity before the death of the employee and spouse, a refund shall be paid as follows: an amount equal to the excess of such amounts over the amounts paid on such annuities without interest on either such amount.
If a reversionary annuity becomes payable under Section 13-303, the refund provided in this section shall not be paid until the death of the reversionary annuitant and the refund otherwise payable under this section shall be then further reduced by the amount of the reversionary annuity paid.
40 ILCS 5/13-601