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139 STAT. 224 PUBLIC LAW 119–21—JULY 4, 2025 (4) LIMITATION ON NUMBER OF DESIGNATIONS.—Section 1400Z-1(d)(1) is amended— (A) in paragraph (1)— (i) by striking ‘‘and subsection (b)(3)’’, and (ii) by inserting ‘‘during any period’’ after ‘‘the number of population census tracts in a State that may be designated as qualified opportunity zones under this section’’, and (B) in paragraph (2), by inserting ‘‘during any period’’ before the period at the end. (5) EFFECTIVE DATES.— (A) IN GENERAL.—Except as provided in subparagraph (B), the amendments made by this subsection shall take effect on the date of the enactment of this Act. (B) PUERTO RICO.—The amendment made by para- graph (3) shall take effect on December 31, 2026. (b) QUALIFICATION FOR DESIGNATIONS.— (1) DETERMINATION OF LOW-INCOME COMMUNITIES.—Section 1400Z-1(c) is amended by striking all that precedes paragraph (2) and inserting the following: ‘‘(c) OTHER DEFINITIONS.—For purposes of this section— ‘‘(1) LOW-INCOME COMMUNITIES.—The term ‘low-income community’ means any population census tract if— ‘‘(A) such population census tract has a median family income that— ‘‘(i) in the case of a population census tract not located within a metropolitan area, does not exceed 70 percent of the statewide median family income, or ‘‘(ii) in the case of a population census tract located within a metropolitan area, does not exceed 70 percent of the metropolitan area median family income, or ‘‘(B) such population census tract— ‘‘(i) has a poverty rate of at least 20 percent, and ‘‘(ii) has a median family income that— ‘‘(I) in the case of a population census tract not located within a metropolitan area, does not exceed 125 percent of the statewide median family income, or ‘‘(II) in the case of a population census tract located within a metropolitan area, does not exceed 125 percent of the metropolitan area median family income.’’. (2) REPEAL OF RULE FOR CONTIGUOUS CENSUS TRACTS.— Section 1400Z-1 is amended by striking subsection (e) and by redesignating subsection (f) as subsection (e). (3) PERIOD FOR WHICH DESIGNATION IS IN EFFECT.—Section 1400Z-1(e), as redesignated by paragraph (2), is amended to read as follows: ‘‘(e) PERIOD FOR WHICH DESIGNATION IS IN EFFECT.— ‘‘(1) IN GENERAL.—A designation as a qualified opportunity zone shall remain in effect for the period beginning on the applicable start date and ending on the day before the date that is 10 years after the applicable start date. ‘‘(2) APPLICABLE START DATE.—For purposes of this section, the term ‘applicable start date’ means, with respect to any qualified opportunity zone designated under this section, the Definition. 26 USC 1400Z–1 note.