the individual's spouse file a joint return for the taxable year. (7) Adjustment for inflation In the case of any taxable year beginning after December 31, 2024, each of the dollar amounts in paragraphs (1), (2)(A)(ii), and (3)(C)(i) shall be increased by an amount equal to— (A) such dollar amount, multiplied by (B) 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 2023 for calendar year 2016 in subparagraph (A)(ii) thereof. Any increase determined under the preceding sentence shall be rounded to the next lowest multiple of $50. (c) Definitions For purposes of this section— (1) First-time homebuyer (A) In general The term first-time homebuyer means any individual who acquires a principal residence located in the United States by purchase if such individual (and, if married, such individual's spouse)— (i) has not claimed any credit or deduction under this title for any previous taxable year with respect to the purchase or ownership of any residence or residential real estate (including for any expenditures relating to the placing in service of any property on, in connection with, or for use in such a residence or real estate), and (ii) attests under penalty of perjury that— (I) the individual (and, if married, the individual's spouse) has not owned a principal residence at any time prior to the purchase of the principal residence to which this section applies, and (II) the principal residence to which this section applies was not acquired from a person related to such individual or spouse. (B) Waiver in case of certain changes in status The Secretary may, in such manner as the Secretary may prescribe, waive the requirements of subparagraph (A) for a taxable year in the case of an individual who is not eligible to file a joint return for the taxable year, and who was married at the time the individual or the individual's former spouse purchased a previous residence. (2) Principal residence The term