under subsection (a), and (4) with respect to the application of the credit to third party payors (including professional employer organizations, certified professional employer organizations, or agents under section 3504 of such Code), including to allow such payors to submit documentation necessary to substantiate eligibility for, and the amount of, the credit allowed under this section. (i) Application of section This section shall apply only to qualified pandemic-related employee benefit expenses paid after March 12, 2020, and before January 1, 2021. (j) Transfers to certain trust funds There are hereby appropriated to the Federal Old-Age and Survivors Insurance Trust Fund and the Federal Disability Insurance Trust Fund established under section 201 of the Social Security Act ( 42 U.S.C. 401 ) and the Social Security Equivalent Benefit Account established under section 15A(a) of the Railroad Retirement Act of 1974 ( 45 U.S.C. 231n–1(a) ) amounts equal to the reduction in revenues to the Treasury by reason of this section (without regard to this subsection). Amounts appropriated by the preceding sentence shall be transferred from the general fund at such times and in such manner as to replicate to the extent possible the transfers which would have occurred to such Trust Fund or Account had this section not been enacted. B Tax credits to prevent business interruption 20211. Improvements to employee retention credit (a) Increase in credit percentage Section 2301(a) of the CARES Act is amended by striking 50 percent and inserting 80 percent . (b) Increase in per employee limitation Section 2301(b)(1) of the CARES Act is amended by striking for all calendar quarters shall not exceed $10,000. and inserting shall not exceed— (A) $15,000 in any calendar quarter, and (B) $45,000 in the aggregate for all calendar quarters. . (c) Modification of threshold for treatment as a large employer (1) In general Section 2301(c)(3)(A) of the CARES Act is amended— (A) by striking for which the average number of full-time