evidence that— (i) the eligible dwelling unit meets the lead hazard reduction criteria defined by the Secretary, in consultation with the Administrator of the Environmental Protection Agency, or (ii) the eligible dwelling unit meets lead hazard evaluation criteria established under an authorized State or local program, and (B) documentation showing that the lead hazard reduction activity meets the requirements of this section. (5) Basis reduction The basis of any property for which a credit is allowable under subsection (a) shall be reduced by the amount of such credit. (6) No double benefit Any deduction allowable for costs taken into account in computing the amount of the credit for lead-based abatement shall be reduced by the amount of such credit attributable to such costs. (d) Inflation adjustment In the case of any taxable year beginning in a calendar year after 2018, each of the dollar amounts in subsections (b) and (c)(2)(A)(iii) shall be increased by an amount equal to— (1) such dollar amount, multiplied by (2) the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins, determined by substituting ‘calendar year 2017’ for ‘calendar year 1992’ in subparagraph (B) thereof. Any increase determined under the preceding sentence shall be rounded to the nearest multiple of $100. . (b) Conforming amendments (1) Section 1324(b)(2) of title 31, United States Code, is amended by inserting “, 36C” after “36B”. (2) The table of sections for subpart C of part IV of subchapter A of chapter 1 of the Internal Revenue Code of 1986 is amended by inserting before the item relating to section 37 the following new item: Sec. 36C. Home lead hazard reduction activity. . (c) Effective date The amendments made by this section shall apply to lead hazard reduction activity costs incurred after December 31, 2017, in taxable years ending after that date.