30 ILCS 20/1
It is hereby made the duty of all officers or agents of public or municipal bodies of this state, who receive any funds, monies, or other things of value, by virtue of their offices or positions, except treasurers, to keep an account of all such receipts, by entries on written or printed forms, to be provided for the purpose by the public bodies or municipalities by the authority of which their offices or positions are held. Said forms shall provide for an original and at least two copies of each entry, to be made by the same operation, and shall show the date and amount of each receipt, and the account for which the payment or delivery was made.
Each month's receipts shall be separately paid over or delivered to the treasurer not later than the middle of the next succeeding month, and therewith one copy of the record of receipts shall be delivered to the treasurer; provided that such receipts shall be paid and corresponding record of receipts shall be delivered oftener if required by the governing body of the public body concerned. A copy of said record shall be delivered to the governing body of the public body concerned, or to such officer thereof as may be directed by such governing body, not later than five days after the time required for the payment to the treasurer. One copy shall be retained by the officer or agent making the payment or report, as a permanent record.
All funds, monies, or other things of value, received by virtue of such office or position, shall be included in the first payment and report made under this act, itemized as near as may be in accordance with payments and reports made under this act. All such funds, monies, and things of value, shall be held by the treasurer, subject to the rights of all persons or public bodies therein, and shall be paid out, disbursed or delivered by the treasurer as provided by law.
30 ILCS 20/1