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139 STAT. 264 PUBLIC LAW 119–21—JULY 4, 2025 enactment of this paragraph), the certification referred to in subclause (II)(bb) shall— ‘‘(aa) include— ‘‘(AA) the supplier’s employer identi- fication number, or ‘‘(BB) any such similar identification number issued by a foreign government, ‘‘(bb) be signed under penalties of perjury, ‘‘(cc) be retained by the supplier and the taxpayer for a period of not less than 6 years and shall be provided to the Secretary upon request, and ‘‘(dd) be from the supplier from which the taxpayer purchased any manufactured product, eligible component, or constituent ele- ments, materials, or subcomponents of an eligible component, stating— ‘‘(AA) that such property was not pro- duced or manufactured by a prohibited foreign entity and that the supplier does not know (or have reason to know) that any prior supplier in the chain of produc- tion of that property is a prohibited for- eign entity, ‘‘(BB) for purposes of section 45X, the total direct material costs for each compo- nent, constituent element, material, or subcomponent that were not produced or manufactured by a prohibited foreign entity, or ‘‘(CC) for purposes of section 45Y or section 48E, the total direct costs attrib- utable to all manufactured products that were not produced or manufactured by a prohibited foreign entity. ‘‘(iv) EXISTING CONTRACT.—Upon the election of the taxpayer (in such form and manner as the Sec- retary shall designate), in the case of any manufac- tured product, eligible component, or constituent ele- ment, material, or subcomponent of an eligible compo- nent which is— ‘‘(I) acquired by the taxpayer, or manufactured or assembled by or for the taxpayer, pursuant to a binding written contract which was entered into prior to June 16, 2025, and ‘‘(II)(aa) placed into service before January 1, 2030 (or, in the case of an applicable facility, as defined in section 45Y(d)(4)(B), before January 1, 2028) in a facility the construction of which began before August 1, 2025, or ‘‘(bb) in the case of a constituent element, material, or subcomponent, used in a product sold before January 1, 2030, the cost to the taxpayer with respect to such product, component, element, material, or subcomponent shall not be included for purposes of determining the mate- rial assistance cost ratio under this subparagraph. Designation. Effective dates. Time period.