Opinion of the Court
The IRS addressed the availability of tax credits by promulgating a rule that made them available on both State and Federal Exchanges. 77 Fed. Reg. 30378 (2012). As relevant here, the IRS Rule provides that a taxpayer is eligible for a tax credit if he enrolled in an insurance plan through "an Exchange," 26 CFR §1.36B–2 (2013), which is defined as "an Exchange serving the individual market . . . regardless of whether the Exchange is established and operated by a State . . . or by HHS," 45 CFR §155.20 (2014). At this point, 16 States and the District of Columbia have established their own Exchanges; the other 34 States have elected to have HHS do so.
D
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 their income,which would exempt them from the Act’s coverage requirement. 26 U. S. C. §5000A(e)(1).
Under the IRS Rule, however, Virginia’s Exchange would qualify as "an Exchange established by the State under [42 U. S. C. §18031]," so petitioners would receive tax credits. That would make the cost of buying insurance less than eight percent of petitioners' income, which would subject them to the Act's coverage requirement. The IRS Rule therefore requires petitioners to either buy health insurance they do not want, or make a payment to the IRS.
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. King v.
