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Rh enforce it according to its terms. Hardt v. ''Reliance Standard Life Ins. Co.'', 560 U. S. 242, 251 (2010). But often-times the "meaning—or ambiguity—of certain words or phrases may only become evident when placed in context.” Brown & Williamson, 529 U. S., at 132. So when deciding whether the language is plain, we must read the words "in their context and with a view to their place in the overall statutory scheme." Id., at 133 (internal quotation marks omitted). Our duty, after all, is "to construe statutes, not isolated provisions." Graham County Soil and Water Conservation Dist. v. United States ex rel. Wilson, 559 U. S. 280, 290 (2010) (internal quotation marks omitted).

We begin with the text of Section 36B. As relevant here, Section 36B allows an individual to receive tax credits only if the individual enrolls in an insurance plan through "an Exchange established by the State under [42 U. S. C. §18031]." In other words, three things must be true: First, the individual must enroll in an insurance plan through "an Exchange." Second, that Exchange must be "established by the State." And third, that Exchange must be established "under [42 U. S. C. §18031]." We address each requirement in turn.

First, all parties agree that a Federal Exchange qualifies as "an Exchange" for purposes of Section 36B. See Brief for Petitioners 22; Brief for Respondents 22. Section 18031 provides that "[e]ach State shall . . . establish an American Health Benefit Exchange . . . for the State." §18031(b)(1). Although phrased as a requirement, the Act gives the States "flexibility" by allowing them to "elect" whether they want to establish an Exchange. §18041(b). If the State chooses not to do so, Section 18041 provides that the Secretary “shall. . . establish and operate such Exchange within the State." §18041(c)(1) (emphasis added).