beginning after the date of the enactment of the Affordable Housing Credit Improvement Act of 2023 , the preceding sentence shall be applied by substituting 25 percent for 50 percent . . (b) Effective date The amendment made by this section shall apply to any building some portion of which, or of the land on which the building is located, is financed by an obligation which is described in section 42(h)(4)(A) of the Internal Revenue Code of 1986 and which is part of an issue the issue date of which is after December 31, 2023. IV Reforms relating to Native American assistance 401. Selection criteria under qualified allocation plans (a) In general Subparagraph (C) of section 42(m)(1) of the Internal Revenue Code of 1986, as amended by section 312, is further amended by striking and at the end of clause (x), by striking the period at the end of clause (xi) and inserting , and , and by adding at the end the following new clause: (xii) the affordable housing needs of individuals in the State who are— (I) enrolled members of a tribe with respect to an Indian tribal government (including any agencies or instrumentalities of an Indian tribal government and any Alaska Native regional or village corporation, as defined in, or established pursuant to, the Alaska Native Claims Settlement Act ( 43 U.S.C. 1601 et seq. ), or (II) described in section 801(9) of the Native American Housing Assistance and Self-Determination Act of 1996 ( 25 U.S.C. 4221(9) ). . (b) Effective date The amendments made by this section shall apply to allocations of credits under section 42 of the Internal Revenue Code of 1986 made after December 31, 2023. 402. Inclusion of Indian areas as difficult development areas for purposes of certain buildings (a) In general Subclause (I) of section 42(d)(5)(B)(iii) of the Internal Revenue Code of 1986 is amended by inserting before the period the following: , and any Indian area . (b) Indian area Clause (iii) of section 42(d)(5)(B) of the Internal Revenue Code of 1986 is amended by redesignating subclause (II)