Ill. Admin. Code tit. 74, § 320.50
b) The cost effectiveness test will be met where the total collection cost expended or anticipated will exceed the amount of the claim that would reasonably be expected to be realized as a result of those collection costs. The determination of "collection costs expended" shall include the direct costs for processing the Agency's offset claims. For the purposes of this Section, direct costs shall include, at a minimum the following: personnel and related fringe benefits, office space, equipment, supplies, and any other expenses determined by the agency to be directly associated with the processing offsets by the Agency. The estimation of future collections shall be based upon the historical collection efficiency of the Comptroller's Offset System for the particular type of receivable. The following examples set forth circumstances where referral for offset would not be cost effective: