In the DOL, in addition to the guidance contained in 2 CFR 200.1 , a questioned cost means a cost that is questioned by an auditor, Federal Project Officer, Grant Officer, or other authorized Awarding agency representative because of an audit or monitoring finding:
(a) Which resulted from a violation or possible violation of a statute, regulation, or the terms and conditions of a Federal award, including for funds used to match Federal funds;(b) Where the costs, at the time of the audit, are not supported by adequate documentation; or(c) Where the costs incurred appear unreasonable and do not reflect the actions a prudent person would take in the circumstances.(d) Questioned costs are not an improper payment until reviewed and confirmed to be improper as defined in OMB Circular A-123 Appendix C (see also the definition of improper payment in 2 CFR 200.1 ) .79 FR 76081, Dec. 19, 2014, as amended at 80 FR 81440, Dec. 30, 2015; 86 FR 22108, Apr. 27, 2021