550
Opinion of the Court
II
An oil and gas producer cannot ordinarily depreciate or otherwise recover (before disposition) his investment in land on which he drills wells because the process of producing his taxable income does not wear out or use up the land. See, e. g., Treas. Reg. § 1.167(a)-2 (disallowing a depreciation deduction for "land apart from the improvements or physical development added to it"). Part of the purchase price of a fee simple interest in the land, however, represents investment in the right to extract any oil and gas from subsurface deposits, which (unlike the land) are "wasting assets," gradually depleted as the minerals are removed. An owner of such wasting assets, according to basic income tax theory, should accordingly be allowed a "reasonable allowance for depletion," 26 U. S. C. § 611(a) (1976 ed.), "to compensate [him] for the part exhausted in production, so that when the minerals are gone, the owner's capital and his capital assets remain unimpaired." Paragon Jewel Coal Co. v. Commissioner, 380 U. S. 624, 631 (1965).
To a degree, however, practice and theory have drifted apart. The Code and associated Treasury Department regulations require taxpayers to calculate depletion allowances by whichever of two methods produces the larger deduction for the current taxable year. Treas. Reg. § 1.611-1(a)(1); see also 26 U. S. C. § 613(a) (1976 ed.) ("In no case shall the allowance for depletion under section 611 be less than it would be if computed without reference to this section [concerning percentage depletion]"). The first method, "cost depletion," remains firmly moored to the rationale articulated in Paragon Jewel. Under that method, the taxpayer estimates the number of recoverable units in his mineral deposit, and deducts an appropriate portion of the deposit's adjusted basis for each unit extracted and sold. See Treas. Reg. §§ 1.611-2, 1.612-1. When the sum of prior deductions equals the cost or other basis of the deposit, plus allowable capital addi-
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