45 C.F.R. § 310.25 When must a Tribe or Tribal organization submit a Tribal CSE program application?
Title 45 - Public Welfare
(a) The initial application consisting of the Tribal CSE program plan that meets the requirements under subpart C of this part, and the application and budget information forms (SF 424, Application for Federal Assistance, and SF 424A, Budget Information—Non-Construction Programs) may be submitted at any time. (b) Subsequent refunding applications containing only SF 424, Application for Federal Assistance, and SF 424A, Budget Information—Non-Construction Programs, must be submitted annually at least 60 days before the beginning of the next budget period if the Tribe or Tribal organization wishes to receive its funding on time. (c) If a Tribe or Tribal organization intends to make any substantial or material change in any aspect of the Tribal CSE program: (1) A Tribal CSE plan amendment must be submitted at the earliest reasonable time for approval under §310.35. The plan amendment must describe and, as appropriate, document the changes the Tribe or Tribal organization proposes to make to its CSE plan, consistent with the requirements under §310.65. (2) Any amendment of an approved Tribal CSE plan may, at the option of the Tribe or Tribal organization, be considered as a submission of a new Tribal CSE plan. If the Tribe or Tribal organization requests that such amendments be so considered, they must be submitted no less than 90 days before the proposed effective date of the new plan. (d) [Reserved] (e) The effective date of a plan amendment may not be earlier than the first day of the calendar quarter in which an approvable plan is submitted.
Title 45: Public Welfare
PART 310—COMPREHENSIVE TRIBAL CHILD SUPPORT ENFORCEMENT (CSE) PROGRAMS
Subpart B—Tribal CSE Program Application Procedures
§ 310.25 When must a Tribe or Tribal organization submit a Tribal CSE program application?

