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interpretation because it would destabilize the individual insurance market in any State with a Federal Exchange, and likely create the very "death spirals" that Congress designed the Act to avoid. Under petitioners’ reading, the Act would not work in a State with a Federal Exchange. As they see it, one of the Act’s three major reforms—the tax credits—would not apply. And a second major reform the coverage requirement would not apply in a meaningful way, because so many individuals would be exempt from the requirement without the tax credits. If petitioners are right, therefore, only one of the Act's three major reforms would apply in States with a Federal Exchange.

The combination of no tax credits and an ineffective coverage requirement could well push a State’s individual insurance market into a death spiral. It is implausible that Congress meant the Act to operate in this manner. Congress made the guaranteed issue and community rating requirements applicable in every State in the Nation, but those requirements only work when combined with the coverage requirement and tax credits. It thus stands to reason that Congress meant for those provisions to apply in every State as well. Pp. 15–19.

(d) The structure of Section 36B itself also suggests that tax credits are not limited to State Exchanges. Together, Section 36B(a), which allows tax credits for any "applicable taxpayer," and Section 36B(c)(1), which defines that term as someone with a household income between 100 percent and 400 percent of the federal poverty line, appear to make anyone in the specified income range eligible for a tax credit. According to petitioners, however, those provisions are an empty promise in States with a Federal Exchange. In their view, an applicable taxpayer in such a State would be eligible for a tax credit, but the amount of that tax credit would always be zero because of two provisions buried deep within the Tax Code. That argument fails because Congress "does not alter the fundamental details of a regulatory scheme in vague terms or ancillary provisions." Whitman v. American Trucking Assns., Inc., 531 U. S. 457. Pp. 19–20.

(e) Petitioners’ plain-meaning arguments are strong, but the Act’s context and structure compel the conclusion that Section 36B allows tax credits for insurance purchased on any Exchange created under the Act. Those credits are necessary for the Federal Exchanges to function like their State Exchange counterparts, and to avoid the type of calamitous result that Congress plainly meant to avoid. Pp. 20–21.

759 F. 3d 358, affirmed.

, delivered the opinion of the Court, in which ,