42 CFR § 137.123
Once stable base funding is negotiated, do funding amounts change from year to year?
June 11, 2020
Stable base funding amounts are subject to adjustment:
(a) Annually only to reflect changes in Congressional appropriations by sub-sub activity excluding earmarks;
(b) By mutual agreement of the Self-Governance Tribe and the Secretary; or
(c) As a result of full or partial retrocession or reassumption.