705 ILCS 505/21
The court is authorized to impose, by uniform rules, a fee of $15 for the filing of a petition in any case in which the award sought is more than $50 and less than $1,000 and $35 in any case in which the award sought is $1,000 or more; and to charge and collect for copies of opinions or other documents filed in the Court of Claims such fees as may be prescribed by the rules of the Court. All fees and charges so collected shall be forthwith paid into the State Treasury.
A petitioner who is a prisoner in an Illinois Department of Corrections facility who files a pleading, motion, or other filing that purports to be a legal document against the State, the Illinois Department of Corrections, the Prisoner Review Board, or any of their officers or employees in which the court makes a specific finding that it is frivolous shall pay all filing fees and court costs in the manner provided in Article XXII of the Code of Civil Procedure.
In claims based upon lapsed appropriations or lost warrant or in claims filed under the Line of Duty Compensation Act, the Illinois National Guardsman's Compensation Act, or the Crime Victims Compensation Act or in claims filed by medical vendors for medical services rendered by the claimant to persons eligible for Medical Assistance under programs administered by the Department of Healthcare and Family Services , no filing fee shall be required.
705 ILCS 505/21