30 ILCS 105/30c
The acceptance of a reduction in earnings or the foregoing of an increase in earnings by an employee in consideration for which an employer pays the amount of the adjustment in earnings to an insurance company or companies selected by the employer to be applied as a premium on an annuity contract, with or without incidental life insurance benefits, under which the employee's rights are non-forfeitable except for failure to pay future premiums may be permitted in the following cases:
The State may enter into agreements whereby individual employees elect to receive, in lieu of salary or wages, benefits which are not taxable under the federal Internal Revenue Code. Such agreements may include the acceptance of a reduction in earnings or the foregoing of an increase in earnings by an employee and the employer's payment of such amounts, as employer contributions, for benefits which the employee selects from a list of employee benefits offered by the employer.
The selection of the insurance company or companies, health care provider or organization and the purchase of the contracts shall not be subject to "The Illinois Purchasing Act".
Each employer, or Department, as specified in this Section, the Department of Children and Family Services with the Comptroller, the Department of Human Services with the Comptroller or the Department of Corrections with the Comptroller or the State Board of Education with the Comptroller, as the case may be, may adopt rules to implement this Act including, but not by way of limitation, (a) the method of filing an election to accept an adjustment in earnings and revocation of the election, (b) the effective date of an election, (c) changes in the amount of the adjustment in earnings, and (d) selection of the organization, company or companies from which contracts are to be purchased.
30 ILCS 105/30c