42 CFR 457.226 - Fiscal policies and accountability.
(a) Maintain an accounting system and supporting fiscal records to assure that claims for Federal funds are in accord with applicable Federal requirements;
(b) Retain records for 3 years from date of submission of a final expenditure report;
(c) Retain records beyond the 3-year period if audit findings have not been resolved; and
(d) Retain records for nonexpendable property acquired under a Federal grant for 3 years from the date of final disposition of that property.