80 Ill. Adm. Code 2900.90
Receipts Required
Section 2900.90Â Receipts Required
Receipts are required for any transportation, lodging or
miscellaneous expense that individually exceeds $10. Â If the receipts are not
available, a signed affidavit by the traveler certifying the amount may be
acceptable. Agencies are responsible for proper monitoring of claims under this
Section.