45 CFR §286.65

1. (a)Any eligible Indian tribe, Alaska Native organization, or intertribal consortium that wishes to administer a Tribal TANF program must submit a three-year TFAP to the Secretary of the Department of Health and Human Services. The original must be submitted to the appropriate ACF Regional Office with a copy to the ACF Central Office.
2. (b)A Tribe currently operating a Tribal TANF program must submit to the appropriate ACF Regional Office, with a copy to the ACF Central Office, no later than 120 days prior to the end of the three-year grant period, either—
   1. (1)A letter of intent, with a copy to the affected State or States, which specifies they do not intend to continue operating the program beyond the end of the three-year grant period; or
   2. (2)A letter of intent, with a copy to the affected State or States, which specifies they intend to continue program operations with no changes to the geographic service area or service population; or
   3. (3)A new three-year plan which indicates a change in either the geographic service area or service population.
3. (c)For Tribes choosing option (b)(2) above, a new three-year plan must be submitted to the appropriate ACF Regional Office, with a copy to the ACF Central Office, no later than 60 days before the end of the current three-year grant period.