352
Opinion of the Court
lated to operating losses, credit carrybacks, foreign taxes, self-employment taxes, worthless securities, and bad debts); see also United States v. Dalm, 494 U. S. 596, 610 (1990) (discussing mitigation provisions set forth in 26 U. S. C. §§ 1311-1314); § 507 of the Revenue Act of 1942, 56 Stat. 961 (temporarily tolling limitations period during wartime).
To read an "equitable tolling" provision into these provisions, one would have to assume an implied exception for tolling virtually every time a number appears. To do so would work a kind of linguistic havoc. Moreover, such an interpretation would require tolling, not only procedural limitations, but also substantive limitations on the amount of recovery—a kind of tolling for which we have found no direct precedent. Section 6511's detail, its technical language, the iteration of the limitations in both procedural and substantive forms, and the explicit listing of exceptions, taken together, indicate to us that Congress did not intend courts to read other unmentioned, open-ended, "equitable" exceptions into the statute that it wrote. There are no counter-indications. Tax law, after all, is not normally characterized by case-specific exceptions reflecting individualized equities.
The nature of the underlying subject matter—tax collection—underscores the linguistic point. The IRS processes more than 200 million tax returns each year. It issues more than 90 million refunds. See Dept. of Treasury, Internal Revenue Service, 1995 Data Book 8-9. To read an "equitable tolling" exception into § 6511 could create serious administrative problems by forcing the IRS to respond to, and perhaps litigate, large numbers of late claims, accompanied by requests for "equitable tolling" which, upon close inspection, might turn out to lack sufficient equitable justification. See H. R. Conf. Rep. No. 356, 69th Cong., 1st Sess., 41 (1926) (deleting provision excusing tax deficiencies in the estates of insane or deceased individuals because of difficulties involved in defining incompetence). The nature and potential magnitude of the administrative problem suggest that Congress
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