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139 STAT. 260 PUBLIC LAW 119–21—JULY 4, 2025 ‘‘(J) BEGINNING OF CONSTRUCTION.—For purposes of applying any provision under this paragraph, the beginning of construction with respect to any property shall be deter- mined pursuant to rules similar to the rules under Internal Revenue Service Notice 2013–29 and Internal Revenue Service Notice 2018-59 (as well as any subsequently issued guidance clarifying, modifying, or updating either such Notice), as in effect on January 1, 2025. ‘‘(K) REGULATIONS AND GUIDANCE.—The Secretary may prescribe such regulations and guidance as may be nec- essary or appropriate to carry out the provisions of this paragraph, including rules to prevent the circumvention of any rules or restrictions with respect to prohibited for- eign entities. ‘‘(52) MATERIAL ASSISTANCE FROM A PROHIBITED FOREIGN ENTITY.— ‘‘(A) IN GENERAL.—The term ‘material assistance from a prohibited foreign entity’ means— ‘‘(i) with respect to any qualified facility or energy storage technology, a material assistance cost ratio which is less than the threshold percentage applicable under subparagraph (B), or ‘‘(ii) with respect to any facility which produces eligible components, a material assistance cost ratio which is less than the threshold percentage applicable under subparagraph (C). ‘‘(B) THRESHOLD PERCENTAGE FOR QUALIFIED FACILITIES AND ENERGY STORAGE TECHNOLOGY.—For purposes of subparagraph (A)(i), the threshold percentage shall be— ‘‘(i) in the case of a qualified facility the construc- tion of which begins— ‘‘(I) during calendar year 2026, 40 percent, ‘‘(II) during calendar year 2027, 45 percent, ‘‘(III) during calendar year 2028, 50 percent, ‘‘(IV) during calendar year 2029, 55 percent, and ‘‘(V) after December 31, 2029, 60 percent, and ‘‘(ii) in the case of energy storage technology the construction of which begins— ‘‘(I) during calendar year 2026, 55 percent, ‘‘(II) during calendar year 2027, 60 percent, ‘‘(III) during calendar year 2028, 65 percent, ‘‘(IV) during calendar year 2029, 70 percent, and ‘‘(V) after December 31, 2029, 75 percent. ‘‘(C) THRESHOLD PERCENTAGE FOR ELIGIBLE COMPO- NENTS.— ‘‘(i) IN GENERAL.—For purposes of subparagraph (A)(ii), the threshold percentage shall be— ‘‘(I) in the case of any solar energy component (as such term is defined in section 45X(c)(3)(A)) which is sold— ‘‘(aa) during calendar year 2026, 50 per- cent, ‘‘(bb) during calendar year 2027, 60 per- cent, Time periods. Effective dates. Time periods. Effective date. Definition. Applicability. Effective date.