25 CFR § 1000.171
When should a Tribe/Consortium submit a letter of interest?
February 24, 2021
A letter of interest may be submitted at any time. To meet the negotiation deadlines below, letters should be submitted to the appropriate non-BIA bureaus by March 1; letters should be submitted to BIA by April 1 for fiscal year Tribes/Consortia or May 1 for calendar year Tribes/Consortia.