Justice Stevens
delivered the opinion of the Court.
The owner of an economic interest in a mineral deposit is allowed a special deduction from taxable income measured by a percentage of his gross income derived from exhaustion of the mineral. This deduction, codified in §§611 and 613 of the Internal Revenue Code of 1954, is designed to compensate such owners for the exhaustion of their interest in a wasting asset, the mineral in place.1 This case presents the question [573]*573whether that “percentage depletion” allowance must be denied to otherwise eligible lessees of underground coal because their leases were subject to termination by the lessor on 30 days’ notice.
This question arises out of three different tax refund suits that were decided by the Court of Claims in a single opinion. 221 Ct. Cl. 246, 602 F. 2d 348. The controlling facts are essentially the same in all three cases. Each taxpayer operated a coal mine pursuant to a written lease; in exchange for a fixed royalty per ton, the lessor granted the lessee the right to extract coal and to sell it at prices determined by the lessee. Each lease contained a clause permitting the lessor to terminate the lease on 30 days’ notice. In fact, however, none of the lessors exercised that right; each lessee mined a substantial tonnage of coal during an uninterrupted operation that continued for several years. The proceeds from the sale of the coal represented the only revenue from which the lessees recovered the royalties paid to the lessors.
In each of the cases, certain additional facts help to illuminate the issue. In the Black Hawk 2 case the lease was to continue “during the term commencing on the first day [574]*574of March, 1964, and terminating when LESSEE shall have exhausted all of The Feds Creek (or Clintwood) Seam of coal, ... or until said tenancy shall be earlier terminated . . . .” App. 77a. The lease required Black Hawk to pay a royalty of 25 cents per ton of coal or $5,000 per year, whichever was larger. Id., at 77a-78a. In addition, the lease required Black Hawk to pay all taxes on the underground coal, as well as the taxes on its plant and equipment and on mined coal. Id., at 79a. Black Hawk paid independent contractors a fixed price per ton to remove the coal, and Black Hawk was free to sell the coal to any party at whatever price it could obtain. Black Hawk mined the seam to exhaustion, operating continuously under the lease for 13 years. Id., at 70a-71a. The Government stipulated that Black Hawk was the sole claimant to the percentage depletion deduction; no claim had been made by the lessor or by any independent mining contractor employed by Black Hawk. Id., at 71a.
The Swank case involves two separate leases executed by Swank and Northumberland County, Pa., pursuant to which Swank operated mines on land owned by the county. The first lease, a deep-mining lease executed in 1964, was terminated in 1968 after a mountain slide forced Swank to close the mine. Id., at 52a. The second, a strip-mining lease executed in 1966, was still being operated by Swank’s successor in interest in 1977 when the case was tried. During the tax years in dispute, Swank’s royalty payments to the county at the rate of 35 cents per ton amounted to $7,545.10 in 1966 and $6,854.05 in 1967. Id., at 53a. The deduction for depletion, which was based on the gross income received from the sale of the coal, was significantly larger.3 The record also indicates that Swank invested significant sums in the construc[575]*575tion of access roads, the acquisition of equipment, and the purchase and improvement of a “tipple” — the surface structure that is used to remove slate and rock from the mined product and to sort the coal into specific sizes for marketing. Id., at 55a-56a.
The Bull Run4 case involves a 5-year lease executed in 1967 and renewed in 1972. Id., at 90a-91a. Unlike the leases in the other cases, it gave the lessor a right of first purchase if it was willing to meet the lessee’s price, and in the tax year in dispute the lessor did purchase all of the coal mined by Bull Run. 221 Ct. Cl., at 249, n. 4, 602 F. 2d, at 350, n. 4. The lease did not, however, limit the lessee’s right to set selling prices or to sell to others who were willing to pay more than the lessor. Ibid. Like the lease in Black Hawk, the lease provided for a royalty of 25 cents per ton. App. 91a. As is also true in both Black Hawk and Swank, there is no suggestion that any other party has made any claim to any part of the percentage depletion allowance at issue in this case.5 See id., at 92a. The Bull Run lease, like the others, contained a provision giving the lessor the right to cancel on 30 days’ written notice.6
[576]*576I
Since 1913 the Internal Revenue Code or its predecessors have provided special deductions for depletion of wasting assets. We have explained these deductions as resting “on the theory that the extraction of minerals gradually exhausts the capital investment in the mineral deposit/’ and therefore the depletion allowance permits “a recoupment of the owner’s capital investment in the minerals so that when the minerals are exhausted, the owner’s capital is unimpaired.” Commissioner v. Southwest Exploration Co., 350 U. S. 308, 312.7 The percentage depletion allowance, however, is clearly more than a method of enabling the operator of a coal mine to recover the amount he has paid for the unmined coal. Because the deduction is computed as a percentage of his gross income from the mining operation and is not computed with reference to the operator’s investment, it provides a special incentive for engaging in this line of business that goes well beyond a purpose of merely allowing the owner of a wasting asset to recoup the capital invested -in that asset.8 As the Court said in Southwest Exploration Co., supra:
“The present allowance, however, bears little relation[577]*577ship to the capital investment, and the taxpayer is not limited to a recoupment on his original investment. The allowance continues so long as minerals are extracted, and even though no money was actually invested in the deposit. The depletion allowance in the Internal Revenue Code of 1939 [the forerunner of the present statute] is solely a matter of congressional grace . . . .” 350 U. S., at 312.9
Hence eligibility for the deduction is determined not by the amount of the capital investment but by the mine operator’s “economic interest” in the coal.10
A recognition that the percentage depletion allowance is more than merely a recovery of the cost of the unmined coal is especially significant in this case. The question here is [578]*578whether a deduction for the asset depleted by respondents will be received by anyone.11 The tax consequences of the lessors’ receipt of royalties will not be affected, either favor[579]*579ably or unfavorably, by our decision in this case.12
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Justice Stevens
delivered the opinion of the Court.
The owner of an economic interest in a mineral deposit is allowed a special deduction from taxable income measured by a percentage of his gross income derived from exhaustion of the mineral. This deduction, codified in §§611 and 613 of the Internal Revenue Code of 1954, is designed to compensate such owners for the exhaustion of their interest in a wasting asset, the mineral in place.1 This case presents the question [573]*573whether that “percentage depletion” allowance must be denied to otherwise eligible lessees of underground coal because their leases were subject to termination by the lessor on 30 days’ notice.
This question arises out of three different tax refund suits that were decided by the Court of Claims in a single opinion. 221 Ct. Cl. 246, 602 F. 2d 348. The controlling facts are essentially the same in all three cases. Each taxpayer operated a coal mine pursuant to a written lease; in exchange for a fixed royalty per ton, the lessor granted the lessee the right to extract coal and to sell it at prices determined by the lessee. Each lease contained a clause permitting the lessor to terminate the lease on 30 days’ notice. In fact, however, none of the lessors exercised that right; each lessee mined a substantial tonnage of coal during an uninterrupted operation that continued for several years. The proceeds from the sale of the coal represented the only revenue from which the lessees recovered the royalties paid to the lessors.
In each of the cases, certain additional facts help to illuminate the issue. In the Black Hawk 2 case the lease was to continue “during the term commencing on the first day [574]*574of March, 1964, and terminating when LESSEE shall have exhausted all of The Feds Creek (or Clintwood) Seam of coal, ... or until said tenancy shall be earlier terminated . . . .” App. 77a. The lease required Black Hawk to pay a royalty of 25 cents per ton of coal or $5,000 per year, whichever was larger. Id., at 77a-78a. In addition, the lease required Black Hawk to pay all taxes on the underground coal, as well as the taxes on its plant and equipment and on mined coal. Id., at 79a. Black Hawk paid independent contractors a fixed price per ton to remove the coal, and Black Hawk was free to sell the coal to any party at whatever price it could obtain. Black Hawk mined the seam to exhaustion, operating continuously under the lease for 13 years. Id., at 70a-71a. The Government stipulated that Black Hawk was the sole claimant to the percentage depletion deduction; no claim had been made by the lessor or by any independent mining contractor employed by Black Hawk. Id., at 71a.
The Swank case involves two separate leases executed by Swank and Northumberland County, Pa., pursuant to which Swank operated mines on land owned by the county. The first lease, a deep-mining lease executed in 1964, was terminated in 1968 after a mountain slide forced Swank to close the mine. Id., at 52a. The second, a strip-mining lease executed in 1966, was still being operated by Swank’s successor in interest in 1977 when the case was tried. During the tax years in dispute, Swank’s royalty payments to the county at the rate of 35 cents per ton amounted to $7,545.10 in 1966 and $6,854.05 in 1967. Id., at 53a. The deduction for depletion, which was based on the gross income received from the sale of the coal, was significantly larger.3 The record also indicates that Swank invested significant sums in the construc[575]*575tion of access roads, the acquisition of equipment, and the purchase and improvement of a “tipple” — the surface structure that is used to remove slate and rock from the mined product and to sort the coal into specific sizes for marketing. Id., at 55a-56a.
The Bull Run4 case involves a 5-year lease executed in 1967 and renewed in 1972. Id., at 90a-91a. Unlike the leases in the other cases, it gave the lessor a right of first purchase if it was willing to meet the lessee’s price, and in the tax year in dispute the lessor did purchase all of the coal mined by Bull Run. 221 Ct. Cl., at 249, n. 4, 602 F. 2d, at 350, n. 4. The lease did not, however, limit the lessee’s right to set selling prices or to sell to others who were willing to pay more than the lessor. Ibid. Like the lease in Black Hawk, the lease provided for a royalty of 25 cents per ton. App. 91a. As is also true in both Black Hawk and Swank, there is no suggestion that any other party has made any claim to any part of the percentage depletion allowance at issue in this case.5 See id., at 92a. The Bull Run lease, like the others, contained a provision giving the lessor the right to cancel on 30 days’ written notice.6
[576]*576I
Since 1913 the Internal Revenue Code or its predecessors have provided special deductions for depletion of wasting assets. We have explained these deductions as resting “on the theory that the extraction of minerals gradually exhausts the capital investment in the mineral deposit/’ and therefore the depletion allowance permits “a recoupment of the owner’s capital investment in the minerals so that when the minerals are exhausted, the owner’s capital is unimpaired.” Commissioner v. Southwest Exploration Co., 350 U. S. 308, 312.7 The percentage depletion allowance, however, is clearly more than a method of enabling the operator of a coal mine to recover the amount he has paid for the unmined coal. Because the deduction is computed as a percentage of his gross income from the mining operation and is not computed with reference to the operator’s investment, it provides a special incentive for engaging in this line of business that goes well beyond a purpose of merely allowing the owner of a wasting asset to recoup the capital invested -in that asset.8 As the Court said in Southwest Exploration Co., supra:
“The present allowance, however, bears little relation[577]*577ship to the capital investment, and the taxpayer is not limited to a recoupment on his original investment. The allowance continues so long as minerals are extracted, and even though no money was actually invested in the deposit. The depletion allowance in the Internal Revenue Code of 1939 [the forerunner of the present statute] is solely a matter of congressional grace . . . .” 350 U. S., at 312.9
Hence eligibility for the deduction is determined not by the amount of the capital investment but by the mine operator’s “economic interest” in the coal.10
A recognition that the percentage depletion allowance is more than merely a recovery of the cost of the unmined coal is especially significant in this case. The question here is [578]*578whether a deduction for the asset depleted by respondents will be received by anyone.11 The tax consequences of the lessors’ receipt of royalties will not be affected, either favor[579]*579ably or unfavorably, by our decision in this case.12 The Government therefore is not contending that the wrong party is claiming the percentage depletion allowance. Rather, the Government takes the position that no such deduction shall be allowed to any party if the legal interest of the lessee-operator is subject to cancellation on short notice.13
II
The language of the controlling statute makes no reference to the minimum duration of the interest in mineral deposits on which a taxpayer may base his claim to percentage depletion.14 The relevant Treasury Regulation merely requires the taxpayer to have an “economic interest” in the unmined coal.15 That term is broadly defined by regulation as follows:
“(b) Economic interest. (1) Annual depletion deduc[580]*580tions are allowed only to the owner of an economic interest in mineral deposits or standing timber. An economic interest is possessed in every case in which the taxpayer has acquired by investment any interest in mineral in place or standing timber and secures, by any form of legal relationship, income derived from the extraction of the mineral or severance of the timber, to which he must look for a return of his capital.” 16
The Government’s argument that the termination clause deprived the lessees of an economic interest is advanced in two forms. First, the Government notes that the regulation distinguishes a mere “economic advantage” 17 from a depleta-ble “economic interest,” and argues that two cases — Parsons v. Smith, 359 U. S. 215, and Paragon Jewel Coal Co. v. Commissioner, 380 U. S. 624 — in which the Court concluded that mining contractors had only an “economic advantage” rather than an “economic interest” in coal deposits — support the conclusion that these lessees also had a mere “economic advantage.” Second, the Government argues as a matter of “practical economics” that the right to terminate gives the lessor the only significant economic interest in the coal. Neither submission is persuasive.
The- Parsons opinion covered two consolidated cases with similar facts. In each the owner of coal-bearing land entered [581]*581into a contract with the taxpayer providing that the taxpayer would strip-mine the coal and deliver it to the owner for a fixed price per ton. Neither of the contracts purported to give the mining contractor any interest in the coal, either before or after it was mined, or any right to sell it to third parties. See 359 U. S., at 216-219. The contracts were terminable on short notice and terminability was one of the seven factors the Court listed to support its conclusion that the independent contractors did not have an economic interest in the coal.18 It is perfectly clear, however, that the Court would have reached the same conclusion if that factor had not been present.
The facts in the Paragon Jewel case were much like those in Parsons, except that the mining contractors dealt with [582]*582lessees instead of the owners of the underground coal. As in Parsons, the contractors agreed to mine the coal at their own expense and deliver it to Paragon’s tipple at a fixed fee per ton.19 The contractors had no control over the coal after delivery to Paragon, had no responsibility for its sale or in fixing its price, and did not even know the price at which Paragon sold the coal. 380 U. S., at 628. The Court stated that the Commissioner took the position that
“only a taxpayer with a legally enforceable right to share in the value of a mineral' deposit has a depletable capital or economic interest in that deposit and the contract miners in this case had no such interest in the unmined coal.” Id., at 627.
The Court agreed that the miners did not have an economic interest in the coal:
“Here, Paragon was bound to pay the posted fee regardless of the condition of the market at the time of the particular delivery and thus the contract miners did not look to the sale of the coal for a return of their investment, but looked solely to Paragon to abide by its covenant.” Id., at 635.
Thus in Paragon Jewel Coal Co., as in Parsons, the termina-bility of the agreements was not the dispositive factor,20 and [583]*583neither case answers the narrow question before us in this case.21
The contrast between the interest of the contractors in Parsons and Paragon Jewel and the lessees in these cases is stark. Whereas those contractors never acquired any legal interest in the coal, the lessees in these cases had a legal interest in the mineral both before and after it was mined, and were free to sell the coal at whatever price the market could bear. Indeed, the Government does not contend that, absent the termination clauses, the lessees would not have had an economic interest in the coal. In contrast, it seems clear that the contract miners’ interest in the Parsons and Paragon Jewel cases would have been insufficient even if their agreements had been for a fixed term.
The Government, however, does argue that the lessors’ right to terminate the leases alone made the taxpayers’ interest so tenuous as to defeat a claim to the percentage depletion deduction.22 According to the Government, as a mat[584]*584ter of “practical economics” an increase in the price of the minerals will “assuredly” lead to an exercise of the lessors’ right to terminate; accordingly, the only significant economic interest is controlled by the lessor. We find this theoretical argument unpersuasive for at least three reasons.
First, the royalty rate is a relatively small element of the mine operator’s total cost.23 Therefore, even if the price of coal increases, the lessor cannot be certain that he will be able to negotiate a more favorable lease with another lessee. Moreover, the quantity of coal extracted by the operator each year may be as important in providing royalties for the lessor as the rate per ton. Purely as a theoretical matter, it therefore is by no means certain that an increase in the price of coal will induce a lessor to terminate a satisfactory business relationship. Indeed, the only evidence in the record — the history of three different operations that were uninterrupted for many years — tends to belie the Government’s entire argument.24
Second, from the standpoint of the taxpayer who did in fact conduct a prolonged and continuous operation, it would [585]*585seem rather unfair to deny him a tax benefit that is available to his competitors simply because he accepted a business risk — the risk of termination — that his competitors were able to avoid when they negotiated their mining leases. It is unlikely that Congress intended to limit the availability of the percentage depletion deduction to the mining operations with the greatest bargaining power.
Third, and most important, the Government has not suggested any rational basis for linking the right to a depletion deduction to the period of time that the taxpayer operates a mine. If the authorization of a special tax benefit for mining a seam of coal to exhaustion is sound policy, that policy would seem equally sound whether the entire operation is conducted by one taxpayer over a prolonged period or by a series of taxpayers operating for successive shorter periods. The Government has suggested no reason why the efficient removal of a great quantity of coal in less than 30 days should have different tax consequences than the slower removal of the same quantity over a prolonged period.25
The Court of Claims correctly concluded that the mere existence of the lessors’ unexercised right to terminate these leases did not destroy the taxpayers’ economic interest in the leased mineral deposits.
The judgment is