25 C.F.R. § 1000.2125 – How do OMB circulars and the Act apply to funding agreements?

(a) A Tribe/Consortium shall apply cost principles under the applicable OMB circular, except as modified by:
1. (1) Any provision of law, including 25 U.S.C. 5325; or
2. (2) Any exemptions or exceptions granted by OMB.
(b) In any circumstances where the provisions of Federal statutes or this part differ from the provisions of 2 CFR part 200, the provisions of the Federal statutes or this part govern. This includes the provisions of Public Law 93-638, including 25 U.S.C. 5325 and 5365(c).