after the date of the enactment of this Act, the taxpayer does not use a normalization method of accounting, the taxpayer’s tax for the taxable year shall be increased by the amount by which it reduces its excess tax reserve more rapidly than permitted under a normalization method of accounting. 13002. Reduction in dividend received deductions to reflect lower corporate income tax rates (a) Dividends received by corporations (1) In general Section 243(a)(1) is amended by striking 70 percent and inserting 50 percent . (2) Dividends from 20-percent owned corporations Section 243(c)(1) is amended— (A) by striking 80 percent and inserting 65 percent , and (B) by striking 70 percent and inserting 50 percent . (3) Conforming amendment The heading for section 243(c) is amended by striking Retention of 80-percent dividend received deduction and inserting Increased percentage . (b) Dividends received from FSC Section 245(c)(1)(B) is amended— (1) by striking 70 percent and inserting 50 percent , and (2) by striking 80 percent and inserting 65 percent . (c) Limitation on aggregate amount of deductions Section 246(b)(3) is amended— (1) by striking 80 percent in subparagraph (A) and inserting 65 percent , and (2) by striking 70 percent in subparagraph (B) and inserting 50 percent . (d) Reduction in deduction where portfolio stock is debt-financed Section 246A(a)(1) is amended— (1) by striking 70 percent and inserting 50 percent , and (2) by striking 80 percent and inserting 65 percent . (e) Income from sources within the United States Section 861(a)(2) is amended— (1) by striking 100/70th and inserting 100/50th in subparagraph (B), and (2) in the flush sentence at the end— (A) by striking 100/80th and inserting 100/65th , and (B) by striking 100/70th and inserting 100/50th . (f) Effective date (1) In general The amendments made by this section (other than subsection (c) thereof) shall apply to dividends received by a corporation after December 31, 2018, in taxable years ending after such date. (2) Limitation The amendments