Pub. L. 115-123, div. D, tit. I, subtit. B, sec. 40302
EXTENSION OF RAILROAD TRACK MAINTENANCE CREDIT.
SEC. 40302. EXTENSION OF RAILROAD TRACK MAINTENANCE CREDIT.(a) In General.—Section 45G(f) is amended by striking “January 1, 2017” and inserting “January 1, 2018”.(b) Effective Date.—(1) In general.—The amendment made by this section shall apply to expenditures paid or incurred in taxable years beginning after December 31, 2016.132 STAT. 146(2) Safe harbor assignments.—Assignments, including related expenditures paid or incurred, under paragraph (2) of section 45G(b) of the Internal Revenue Code of 1986 for taxable years ending after January 1, 2017, and before January 1, 2018, shall be treated as effective as of the close of such taxable year if made pursuant to a written agreement entered into no later than 90 days following the date of the enactment of this Act.