25 C.F.R. § 1000.94 What are BIA residual funds?
Title 25 - Indians
BIA residual funds are the funds necessary to carry out BIA residual functions. BIA residual functions are those functions that only BIA employees could perform if all Tribes were to assume responsibilities for all BIA programs that the Act permits.
Title 25: Indians
PART 1000—ANNUAL FUNDING AGREEMENTS UNDER THE TRIBAL SELF-GOVERNMENT ACT AMENDMENTS TO THE INDIAN SELF-DETERMINATION AND EDUCATION ACT
Subpart E—Annual Funding Agreements for Bureau of Indian Affairs Programs
Determining AFA Amounts
§ 1000.94 What are BIA residual funds?

