shall apply for purposes of subparagraph (A). (C) Coordination with small employer health insurance credit The payroll taxes taken into account under this section with respect to any tax-exempt eligible employer for any taxable year shall be reduced by the amount of any credit allowable to such employer under section 45R(f). . (b) Effective date The amendments made by this section shall apply to taxable years beginning after December 31, 2017. 5. Increase in corporate income tax rate (a) In general Section 11(b) of the Internal Revenue Code of 1986 is amended by striking 21 percent and inserting 21.06 percent . (b) Effective date The amendment made by this section shall apply to taxable years beginning after December 31, 2019.