The table of sections for subchapter B of chapter 65 of such Code is amended by inserting after the item relating to section 6428 the following new item: Sec. 6429. Advance refund of certain net operating losses, research credit, and orphan drug credit. . (d) Effective date The amendments made by this section shall apply to taxable years beginning after December 31, 2019. 3. Enhanced research credit for COVID–19 expenditures (a) In general Section 41 of the Internal Revenue Code of 1986 is amended by adding at the end the following: (i) Enhanced credit for COVID–19 research expenditures (1) In general For purposes of determining the amount of qualified research expenses under subsection (b) for the taxable year, the amount of any qualified COVID–19 research expenditures paid or incurred by a taxpayer on or after February 15, 2020, and before January 1, 2022, shall be equal to 200 percent of the amount paid or incurred. (2) Qualified COVID–19 research expenditures The term qualified COVID–19 research expenditures has the meaning given such term by section 172(g)(2). . (b) Effective date The amendment made by this section shall apply to taxable years beginning after December 31, 2019.