If you are in the Traditional plan:
Your refund is a return of your contributions and includes interest credited, but not in excess of 4.5%. Any interest previously credited to your account in excess of that amount will be forfeited.
If you are in the Portable plan and have fulfilled all the eligibility requirements:
If you have less than five years of qualified service credit, you will receive your contributions plus the full interest that has accumulated on those contributions.
If you have five or more years of qualified service credit, you will receive all your contributions and the full interest that has accumulated on those contributions, plus an equal match from the employer (the State of Illinois).
If eligibility requirements for the Portable Plan have not been met, your refund will be paid under the rules of the Traditional Plan
If you are in the Retirement Savings Plan (RSP) and have fulfilled all RSP eligibility requirements:
If you have less than five years of service credit, you will be eligible for your member contributions and investment return on them.
If you have five or more years of service credit, you will be eligible for the employer contributions and investment return on them, as well as your member contributions and investment return on them.