1. Refundable tax credit for certain home accessibility improvements (a) In general Subpart C of part IV of subchapter A of chapter 1 of the Internal Revenue Code of 1986 is amended by adding at the end the following new section: 36C. Credit for certain home accessibility improvements (a) In general In the case of an individual, there shall be allowed as a credit against the tax imposed by this subtitle for any taxable year an amount equal to 35 percent of the qualified home accessibility improvement expenditures paid or incurred during such taxable year with respect to a qualified individual of the taxpayer. (b) Limitations (1) Dollar limitation The aggregate amount of qualified home accessibility improvement expenditures taken into account under subsection (a) by any taxpayer for any taxable year shall not exceed the excess (if any) of— (A) $15,000, over (B) the aggregate amount of such expenditures so taken into account for all prior taxable years. (2) Income limitation (A) In general The amount allowable as a credit under subsection (a) for any taxable year shall be reduced (but not below zero) by an amount which bears the same ratio to the amount so allowable (determined without regard to this paragraph but with regard to paragraph (1)) as— (i) the amount (if any) by which the taxpayer’s modified adjusted gross income exceeds the applicable threshold amount, bears to (ii) the applicable phaseout range. (B) Applicable threshold amount For purposes of this paragraph, the term applicable threshold amount means, with respect to any taxpayer— (i) $400,000, in the case of a joint return or surviving spouse (as defined in section 2), (ii) $200,000, in the case of a head of household, and (iii) $200,000, in any other case. (C) Applicable phaseout range For purposes of this paragraph, the term applicable phaseout range means, with respect to any taxpayer— (i) $100,000, in the case of a joint return or surviving spouse (as defined in section 2), (ii) $75,000, in the case of a head of household, and (iii) $50,000, in