of section 42(d)(5)(B) of the Internal Revenue Code of 1986, as amended by subsection (b), is amended by adding at the end the following new subclause: (IV) Special rule for buildings in Indian areas In the case of an area which is a difficult development area solely because it is an Indian area, a building shall not be treated as located in such area unless such building is assisted or financed under the Native American Housing Assistance and Self Determination Act of 1996 ( 25 U.S.C. 4101 et seq.) or the project sponsor is an Indian tribe (as defined in section 45A(c)(6)), a tribally designated housing entity (as defined in section 4(22) of such Act ( 25 U.S.C. 4103(22) )), or wholly owned or controlled by such an Indian tribe or tribally designated housing entity. . (d) Effective date The amendments made by this section shall apply to buildings placed in service after December 31, 2017. V Affordable housing tax credit 501. Affordable housing tax credit (a) In general The heading of section 42 of the Internal Revenue Code of 1986 is amended by striking Low-income and inserting Affordable . (b) Conforming amendments (1) Subsection (a) of section 42 of the Internal Revenue Code of 1986 is amended by striking low-income and inserting affordable . (2) Paragraph (5) of section 38(b) of such Code is amended by striking low-income and inserting affordable . (3) The heading of subparagraph (D) of section 469(i)(3) of such Code is amended by striking low-income and inserting affordable . (4) The heading of subparagraph (B) of section 469(i)(6) of such Code is amended by striking low-income and inserting affordable . (5) Paragraph (7) of section 772(a) of such Code is amended by striking low-income and inserting affordable . (6) Paragraph (5) of section 772(d) of such Code is amended by striking low-income and inserting affordable . (c) Clerical amendment The item relating to section 42 in the table of sections for subpart D of part IV of subchapter A of chapter 1 of the Internal Revenue Code of 1986 is amended to read