Cite as: 535 U. S. 212 (2002)
Opinion of the Court
pected to last, for at least 12 months. Second, the Agency reads the term "expected to last" as applicable only when the "inability" has not yet lasted 12 months. In the case of a later Agency determination—where the "inability" did not last 12 months—the Agency will automatically assume that the claimant failed to meet the duration requirement. It will not look back to decide hypothetically whether, despite the claimant's actual return to work before 12 months expired, the "inability" nonetheless might have been expected to last that long.
The Court of Appeals for the Fourth Circuit held both these interpretations of the statute unlawful. We hold, to the contrary, that both fall within the Agency's lawful interpretive authority. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837 (1984). Consequently, we reverse.
I
In 1996 Cleveland Walton, the respondent, applied for both Title II disability insurance benefits and Title XVI Supplemental Security Income. The Agency found that (1) by October 31, 1994, Walton had developed a serious mental illness involving both schizophrenia and associated depression; (2) the illness caused him then to lose his job as a full-time teacher; (3) by mid-1995 he began to work again part time as a cashier; and (4) by December 1995 he was working as a cashier full time.
The Agency concluded that Walton's mental illness had prevented him from engaging in any significant work, i. e., from "engag[ing] in any substantial gainful activity," for 11 months—from October 31, 1994 (when he lost his teaching job) until the end of September 1995 (when he earned income sufficient to rise to the level of "substantial gainful activity"). See 20 CFR §§ 404.1574, 416.974 (2001). And because the statute demanded an "inability to engage in any substantial gainful activity" lasting 12, not 11, months, Walton was not entitled to benefits.
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