49 CFR §29.504

1. (a)A Tribe must apply the applicable cost principles of the Office of Management and Budget's Uniform Administrative Requirements, Cost Principles, and Audit Requirements for Federal Awards, 2 CFR part 200, except as modified by:
   1. (1)25 U.S.C. 5325(k), which sets forth certain categories of allowable uses of funds that a Tribe may include in a funding agreement provided that such use supports implementation of a PSFA;
   2. (2)Other provisions of Federal law; or
   3. (3)Any subsequent exemptions granted by the Office of Management and Budget.
2. (b)The Department may not require a Tribe to apply other audit or accounting standards.