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and 400 percent of the federal poverty line. §36B.

In addition to those three reforms, the Act requires the creation of an "Exchange" in each State—basically, a marketplace that allows people to compare and purchase insurance plans. The Act gives each State the opportunity to establish its own Exchange, but provides that the Federal Government will establish "such Exchange" if the State does not. 42 U. S. C. §§18031, 18041. Relatedly, the Act provides that tax credits "shall be allowed" for any "applicable taxpayer," 26 U. S. C. §36B(a), but only if the taxpayer has enrolled in an insurance plan through "an Exchange established by the State under [42 U. S. C. §18031],” §§36B(b)–(c). An IRS regulation interprets that language as making tax credits available on “an Exchange,” 26 CFR §1.36B–2, “regardless of whether the Exchange is established and operated by a State . . . or by HHS,” 45 CFR §155.20.

Petitioners are four individuals who live in Virginia, which has a Federal Exchange. They do not wish to purchase health insurance. In their view, Virginia’s Exchange does not qualify as "an Exchange established by the State under [42 U. S. C. §18031]," so they should not receive any tax credits. That would make the cost of buying insurance more than eight percent of petitioners' income, exempting them from the Act’s coverage requirement. As a result of the IRS Rule, however, petitioners would receive tax credits. That would make the cost of buying insurance less than eight percent of their income, which would subject them to the Act's coverage requirement.

Petitioners challenged the IRS Rule in Federal District Court. The District Court dismissed the suit, holding that the Act unambiguously made tax credits available to individuals enrolled through a Federal Exchange. The Court of Appeals for the Fourth Circuit affirmed. The Fourth Circuit viewed the Act as ambiguous, and deferred to the IRS's interpretation under Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837.

Held: Section 36B’s tax credits are available to individuals in States that have a Federal Exchange. Pp. 7–21.

(a) When analyzing an agency’s interpretation of a statute, this Court often applies the two-step framework announced in Chevron, 467 U. S. 837. But Chevron does not provide the appropriate framework here. The tax credits are one of the Act’s key reforms and whether they are available on Federal Exchanges is a question of deep "economic and political significance"; had Congress wished to assign that question to an agency, it surely would have done so expressly. And it is especially unlikely that Congress would have delegated this decision to the IRS, which has no expertise in crafting health insurance policy of this sort.

It is instead the Court’s task to determine the correct reading of