limitation on pass-Thru of research credit Subsection (g) of section 41 of such Code is amended by adding at the end the following: Paragraphs (2) and (4) shall not apply with respect to any specified medical research small business pass-thru entity (as defined in section 469(c)(4)). . (e) Effective date The amendments made by this section shall apply to losses and credits arising in taxable years beginning after December 31, 2020.