448
Opinion of the Court
tion of expenditures in computing CTI in certain specific contexts. See, e. g., §§ 994(b)(1)-(2). Yet in promulgating 26 CFR § 1.861-8 (1979), the Secretary of the Treasury exercised his rulemaking authority under 26 U. S. C. § 7805(a), which gives the Secretary general authority to "prescribe all needful rules and regulations for the enforcement" of the Internal Revenue Code. See 41 Fed. Reg. 49160 (1976) ("The proposed regulations are to be issued under the authority contained in section 7805 of the Internal Revenue Code"). Even if we regard the challenged regulation as interpretive because it was promulgated under § 7805(a)'s general rulemaking grant rather than pursuant to a specific grant of authority, we must still treat the regulation with deference. See Cottage Savings Assn. v. Commissioner, 499 U. S. 554, 560-561 (1991).
The words that we have emphasized in the statutory text do place some limits on the Secretary's interpretive authority. First, the "does not exceed" phrase places an upper limit on the share of the export profits that can be assigned to a DISC and also gives the taxpayer an unfettered right to select any of the three methods of setting a "transfer price." Second, the use of the term "combined taxable income" in subsection (a)(2) makes it clear that the taxable income of the domestic parent is a part of the equation that should produce the CTI. As Boeing recognizes, even a charitable contribution to the Seattle Symphony that reduces its domestic earnings from sales of 767's must be treated as a cost that is not definitely related to any particular category of income and thus must be apportioned among all categories of income, including income from export sales. See Brief for Petitioners in No. 01-1209, p. 8, n. 7. Third, the word "attributable" places a limit on the portion of the domestic parent's taxable income that can be treated as a part of the CTI. It is this word that provides the statutory basis for Boeing's position.
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