This final rule makes several revisions to the regulations for the Indian Housing Block Grant (IHBG) program allocation formula. Through the IHBG program, HUD provides federal housing assistance to Indian tribes in a manner that recognizes the right of Indian self- determination and tribal self-government. This final rule follows publication of a February 25, 2005, proposed rule and takes into consideration the public comments received on the proposed rule. Other than one conforming change, this final rule adopts the February 25, 2005, proposed rule without change. HUD negotiated the proposed rule and final rule with active tribal participation and using the procedures of the Negotiated Rulemaking Act of 1990.