paragraph (1). (4) Verification A contribution to which this subsection applies shall be verified in such manner as the Secretary may provide. (5) Inflation adjustment In the case of any taxable year beginning in a calendar year after 2024, the $20 amount contained in paragraph (1) 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 which is not a multiple of $1 shall be rounded to the nearest multiple of $1. (6) Exclusion for Members of Congress Services rendered during any period with respect to which such individual is a Member of Congress (as defined in section 2106 of title 5, United States Code) shall not be treated as qualified services for purposes of this subsection. . (b) Allowance of deduction to individuals who do not elect To itemize deductions Section 63(b) of such Code is amended by striking paragraph (4) and inserting the following new paragraph: (4) so much of the deduction allowed under section 170 for the taxable year as does not exceed the amount of such deduction which would be determined if only contributions treated as made under section 170(p) by reason of services rendered during such taxable year were taken into account. . (c) Effective date The amendments made by this section shall apply to taxable years beginning after December 31, 2023.