; inflation adjustment Subsection (b) of section 9004 of such Code is amended to read as follows: (b) Inflation adjustment (1) In general In the case of any applicable period beginning after 2019, the $300,000,000 dollar amount in subsection (a) 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 following the year which such applicable period begins, determined by substituting calendar year 2018 for calendar year 1992 in subparagraph (B) thereof. (2) Applicable period For purposes of this subsection, the term applicable period means the 4-year period beginning with the first day following the date of the general election for the office of President and ending on the date of the next such general election. (3) Rounding If any amount as adjusted under paragraph (1) is not a multiple of $10,000, such amount shall be rounded to the nearest multiple of $10,000. . (3) Conforming amendment Section 9005(a) of such Code is amended by adding at the end the following new sentence: The Commission shall make such additional certifications as may be necessary to receive payments under section 9004. . (b) Matchable contribution Section 9002 of such Code, as amended by section 2002, is amended by adding at the end the following new paragraph: (14) Matchable contribution The term matchable contribution means, with respect to the election to the office of President of the United States, a contribution by an individual to a candidate or an authorized committee of a candidate with respect to which the candidate has certified in writing that— (A) the individual making such contribution has not made aggregate contributions (including such matchable contribution) to such candidate and the authorized committees of such candidate in excess of $1,000 for the election