Cite as: 513 U. S. 251 (1995)
Opinion of the Court
respect to his deliberative conclusions as to the meaning of these laws.' " Clarke v. Securities Industry Assn., 479 U. S. 388, 403-404 (1987) (quoting Investment Company Institute v. Camp, 401 U. S. 617, 626-627 (1971)).
Under the formulation now familiar, when we confront an expert administrator's statutory exposition, we inquire first whether "the intent of Congress is clear" as to "the precise question at issue." Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837, 842 (1984). If so, "that is the end of the matter." Ibid. But "if the statute is silent or ambiguous with respect to the specific issue, the question for the court is whether the agency's answer is based on a permissible construction of the statute." Id., at 843. If the administrator's reading fills a gap or defines a term in a way that is reasonable in light of the legislature's revealed design, we give the administrator's judgment "controlling weight." Id., at 844.
In authorizing NationsBank to broker annuities, the Comptroller invokes the power of banks to "broker a wide variety of financial investment instruments," Comptroller's Letter 38a, which the Comptroller considers "part of [banks'] traditional role as financial intermediaries," ibid., and therefore an "incidental powe[r] . . . necessary to carry on the business of banking." 12 U. S. C. § 24 Seventh; see also Interpretive Letter No. 494 (Dec. 20, 1989) (discussing features of financial investment instruments brokerage that bring this activity within the "business of banking") (cited in Comptroller's Letter 38a). The Comptroller construes the § 24 Seventh authorization of "incidental powers . . . necessary to carry on the business of banking" as an independent grant of authority; he reads the specific powers set forth thereafter as exemplary, not exclusive.
VALIC argues that the Comptroller's interpretation is contrary to the clear intent of Congress because the banking power on which the Comptroller relies—"broker[ing] financial investment instruments"—is not specified in § 24 Sev-
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