(as so determined) as— (A) the amount by which the taxpayer’s adjusted gross income exceeds the applicable threshold, bears to (B) $20,000. (2) Applicable threshold For purposes of this subsection, the applicable threshold is— (A) except as provided in subparagraph (B) or (C), $40,000, (B) in the case of a joint return, 200 percent of the amount in effect for the taxable year under subparagraph (A), or (C) in the case of a head of household, 150 percent of the amount in effect for the taxable year under subparagraph (A). (3) Inflation adjustment In the case of any taxable year beginning in a calendar year after 2021, the $40,000 dollar amount in paragraph (2) 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 2020 for calendar year 2016 in subparagraph (A)(ii) thereof. Any increase determined under the preceding sentence shall be rounded to the nearest multiple of $500. . (c) Saver’s credit The heading for section 25B of such Code is amended to read as follows: Saver’s credit . . (d) Saver’s credit promotion (1) In general The Secretary of the Treasury (or the Secretary’s delegate) shall take such steps as the Secretary (or delegate) determines are necessary and appropriate to increase public awareness of the credit provided under section 25B of such Code (as amended by this section). (2) Report Not later than 1 year after the date of the enactment of this Act, the Secretary (or delegate) shall submit to Congress a report detailing the steps taken under paragraph (1). (e) Clerical amendment The table of sections for subpart A of part IV of subchapter A of chapter 1 of such Code is amended by striking the item relating to section 25B and inserting the following new item: Sec. 25B. Saver’s credit. . (f) Effective date The amendments made by this section shall apply to taxable years beginning after the date of the enactment