(I), multiplied by the rate of tax under section 11(b). (iii) Election An election under this subparagraph for any taxable year shall be made not later than the time for filing the return of tax for such year (including extensions), shall be made on such return, and shall be made in such manner as the Secretary may prescribe. Such an election, once made, shall be irrevocable. (C) Controlled groups Paragraph (3) of section 280C(b) shall apply for purposes of this paragraph. (i) Coordination with long-term contract rules For purposes of determining percentage of completion under section 460(b)(1)(A), any research or experimental expenditures paid or incurred by the taxpayer in connection with the taxpayer’s trade or business shall be taken into account as a cost allocated to the contract for the taxable year in which so paid or incurred. (j) Coordination with certain other provisions A reference to the corresponding provision of this section shall be treated as included in any reference to section 174 in section 56(b), 59(e), 144(a), 168(i), 170(e), 195(c), 263(a), 263A(c), 469(c), 543(d), 864(g), 993(d), 1016(a)(14), 1202(a), or 1298(e). (k) Termination (1) In general This section shall not apply to amounts paid or incurred in taxable years beginning after December 31, 2025. (2) Change in method of accounting Paragraph (1) (and the corresponding application of section 174) shall be treated as a change in method of accounting for purposes of section 481 and— (A) such change shall be treated as initiated by the taxpayer, (B) such change shall be treated as made with the consent of the Secretary, and (C) such change shall be applied only on a cut-off basis for any research or experimental expenditures paid or incurred in taxable years beginning after December 31, 2025, and no adjustment under section 481(a) shall be made. . (c) Coordination of amortization with certain other provisions Section 174 , as amended by subsection (a), is amended by redesignating subsection (e) as subsection (f) and by inserting after