In this appeal from the Tax Court decision, 71 T.C. 618, sustaining the Commissioner’s finding of deficiency, petitioner-appellant Pledger questions whether the full value of corporate stock purchased pursuant to an employee stock option and subject to certain securities restrictions can constitutionally be taxed as income under Section 83(a) of the Internal Revenue Code. The taxpayer also challenges the decision of the Tax Court that the term “any restriction” in section 83(a) includes the restrictions of an investment letter. Responding to these challenges, we affirm the decision of the Tax Court below.
The stipulated facts in this dispute reveal that Thomas R. Pledger1 (Appellant) purchased 30,000 shares of common stock of Burnup & Sims, Inc. pursuant to an option given to him in the previous year by Mr. Riley V. Sims, the president of the company, as compensation for services. Appellant purchased 6,000 shares in October of. 1971 and purchased the remaining 24,000 shares in November. Upon acquiring the stock appellant executed and delivered to Mr. Sims an investment letter indicating that the stock was acquired for investment and not for sale.2 The letter also stated that the stock certificates were to be stamped with a legend indicating that the shares were not registered under the Securities Act of 1933 and could not be sold absent an effective registration or a “no action” letter from the SEC.
Because of the restrictions imposed by the investment letter, the shares of stock were worth as stipulated only 65 percent of their fair market value if sold pursuant to *289another private placement during a two-year period after purchase. The taxpayer for the taxable year 1971 calculated the excess of the discounted value of the stock over the amount paid for the stock and reported as income $195,363.3 The Commissioner on audit increased the amount of compensation by $239,137 based on the difference between the amount the full fair market value exceeded the taxpayer’s cost and the amount of taxes the taxpayer had paid.4 From this the Commissioner determined a deficiency in the amount of $155,-416 and accordingly adjusted the taxpayer’s basis in the stock.
Appellant filed a petition for a redetermination of deficiency in the United States Tax Court. The Tax Court upheld the deficiency and the taxpayer appealed to this court.
I.
The first issue raised by the appellant presents the recurring question of what is income. All parties agree that the option to purchase stock was compensation for services and that the purchase of the stock was a taxable event. Taxpayer asserts, however, that the government is utilizing Section 83(a) of the Internal Revenue Code 5 to tax a nonexisting value, i. e., the excess of the fair market value of the stock over the discounted value. Section 83(a) provides that the value of compensation in the form of stock or other property for purposes of income taxation is to be determined by reference to the fair market value of the property “without regard to any restriction other than a restriction which by its terms will never lapse.” 26 U.S.C. § 83(a). To the degree this statute allows taxation of an amount in excess of the value for which taxpayer could sell the stock during the time of restriction, taxpayer argues that the statute exceeds the powers of Congress to tax under the Sixteenth Amendment and Article 1, Section 8 of the Constitution.6 Relying on the classic defini*290tion of income as presented in Eisner v. Macomber7 252 U.S. 189, 207, 40 S.Ct. 189, 193, 64 L.Ed. 521 (1920), taxpayer argues that the excess value is not realized gain or “something of exchangeable value ... derived from property.” Id. With these contentions, we disagree.
First, we note that the Sixteenth Amendment did not limit or expand the power of Congress to tax under Article 1, Section 8 of the Constitution. See Brushaber v. Union Pac. R. R., 240 U.S. 1, 36 S.Ct. 236, 60 L.Ed. 493 (1916). The Sixteenth Amendment simply provided for taxation of income without apportionment. In Eisner v. Macomber, supra, 252 U.S. 189, 40 S.Ct. 189, 64 L.Ed. 521, the Court attempted to define the term “income” used, but left undefined, in the Sixteenth Amendment. In that case, the court struck down a taxing statute on the ground that it attempted to tax stock dividends which were not income within the meaning of the Sixteenth Amendment. The case distinguished between income and capital without focusing particularly on the issue of compensation presented in this case. In defining income as “something of exchangeable value,” the Court was stating what was income, not defining the amount of income received. Later developments in the tax law reveal that the definition was not intended as an all-encompassing implication of income. See Commissioner v. Glenshaw Glass Co., 348 U.S. 426, 431, 75 S.Ct. 473, 476, 99 L.Ed. 483 (1955). See generally Note, “Apparent Abandonment of a Definitive Concept of Income,” 45 Harv.L.Rev. 1072 (1923). The parties in this case agree that income was received; the only question is whether 65 percent of the fair market value or the full fair market value was received for purposes of taxation. The language of Eisner does not control this case. The taxing scheme does not contravene the language of Eisner defining income under the Sixteenth Amendment, and even if it did, the language of Eisner is not controlling where a different issue of income is presented.
In a challenge similar to the one in this case the Second Circuit held in Sakol v. Commissioner, 574 F.2d 694 (2d Cir.), cert. denied 439 U.S. 859, 99 S.Ct. 177, 58 L.Ed.2d 168 (1978), that Section 83(a) did not violate the Sixteenth Amendment. In that case the taxpayer received as compensation what she claimed to be a lesser value than the fair market value of stock purchased pursuant to a stock option plan and subject to contractually imposed restrictions on the sale. The court considered that the language of Eisner requiring “gain” to be realized for “income” to exist had been modified by subsequent decisions upholding the accrual method of accounting, Burnet v. Sanford & Brooks Co., 282 U.S. 359, 51 S.Ct. 150, 75 L.Ed. 383 (1931), the doctrine of constructive receipt, Corliss v. Bowers, 281 U.S. 376, 50 S.Ct. 336, 74 L.Ed. 916 (1930), and the tax rules prohibiting assignment of income, Helvering v. Horst, 311 U.S. 112, 61 S.Ct. 144, 85 L.Ed. 75 (1940). Id. at 700. The court concluded that the power of Congress to create a realistic and workable tax scheme to prevent tax avoidance was sufficiently broad to permit the taxation scheme of Section 83(a).7 8
In this case when the taxpayer obtained the stock option, he received some*291thing of value. When he purchased the stock, the value of his compensation for purposes of taxation could be determined by reference to the fair market value of the stock on the day of purchase. Although taxpayer argues that the stock subject to the securities restrictions was worth only 65 percent of its fair market value, taxpayer ignores the fact that the stipulation regarding the 65 percent value pertained only to the discounted value if the stock were sold in another private placement sale.9 A stipulation as to the value of property if sold under certain circumstances does not necessarily reflect the value of the property in the hands of the current owner.10 Although the taxpayer could receive only 65 percent of the fair market value of the stock if sold during the period of the restriction, it does not necessarily follow that the only value the taxpayer received as compensation was 65 percent of the stock’s fair market value. The full value of the stock existed from the moment of purchase; it was only temporarily subject to a diminution in value if exchanged because of the securities restrictions. Despite taxpayer’s claim to the contrary, there was no nonexistent value upon which he was taxed.
The problem in this case is primarily one of timing rather than value of what was received. If taxpayer were taxed on only 65 percent of the fair market value at the time of purchase, but held the stock until the restrictions lapsed, the remaining 35 percent of the fair market value which was also compensation to the taxpayer would be taxed upon sale at the more favorable capital gains rate. This 35 percent value is not an investment increase that the capital gains tax was designed to benefit. Assuming that the stock maintained its value, the 35 percent value was certain to accrue when the restriction lapsed. Appellant, however, argues that if the stock decreased in value, the taxpayer would initially be taxed at ordinary income rates for the full value but would only be allowed to deduct any decrease in value as a capital loss. This fact is arguably true11 but is part of the risk any stockholder encounters when he purchases stock. A corporate employee purchasing stock pursuant to a stock option is not entitled to receive special tax benefits that a general purchaser of stock cannot receive, and indeed the corporate employee should not be heard to complain that he is unfairly taxed on the full fair market value of his compensation when the stock, with his knowledge and implicit consent, is subject to temporary restrictions. In order to achieve a workable and practical solution for taxation, Congress may constitutionally tax the full fair market value at the time of purchase without regard to the temporary restriction. Sakol v. Commissioner, supra, 574 F.2d at 700. Although this value is not the value taxpayer can receive upon immediate sale, Congress may establish this value as the taxable value without contravening the Sixteenth Amendment.
II.
In addition to his argument based on the Sixteenth Amendment, appellant chal*292lenges the application of Section 83(a) under the due process clause of the Fifth Amendment. Relying primarily on Heiner v. Donnan, 285 U.S. 312, 52 S.Ct. 358, 76 L.Ed. 772 (1932), and Schlesinger v. Wisconsin, 270 U.S. 230, 46 S.Ct. 260, 70 L.Ed. 557 (1926), two cases which struck down statutes conclusively presuming certain gifts-were made in contemplation of death, taxpayer argues that Section 83(a) operates as a conclusive presumption that “lettered” stock received as compensation has the same value as its registered counterpart. Because this value is a fiction, taxpayer argues, the statute deprives the taxpayer of property without due process of law.
The standard of review in the Fifth Circuit governing a due process challenge to a taxing statute is, as taxpayer concedes, whether the taxing statute is so arbitrary and capricious as to amount to a denial of due process. Carr Staley, Inc. v. United States, 496 F.2d 1366, 1375 (5th Cir.), cert. denied, 420 U.S. 963, 95 S.Ct. 1355, 43 L.Ed.2d 441 (1975). See also Brushaber v. Union Pac. R. R., supra, 240 U.S. at 24-25, 36 S.Ct. at 244. The cases upon which taxpayer primarily relies, Heiner v. Donnan, supra, 285 F.2d 312, and Schlesinger v. Wisconsin, supra, 270 U.S. 230, 46 S.Ct. 260, 70 L.Ed. 557, applied this standard, holding that the creation of an irrebuttable presumption in the legislation in question was arbitrary and capricious. The court in Carr Staley, Inc. v. United States, supra, 496 F.2d at 1374, considered these cases but held in that case that the earlier cases were not controlling and that a “reasonable basis in fact” would justify the statutory scheme. Thus, the irrebuttable presumption doctrine, to the degree it exists in taxing cases, clearly does not require a holding that any irrebuttable presumption is per se unconstitutional as an arbitrary and capricious statutory scheme. This view received further support from the Supreme Court’s subsequent pronouncements concerning the irrebuttable presumption doctrine in Weinberger v. Salfi, 422 U.S. 749, 95 S.Ct. 2457, 45 L.Ed.2d 522 (1975), and Usery v. Turner Elkhorn Mining Co., 428 U.S. 1, 96 S.Ct. 2882, 49 L.Ed.2d 752 (1976), indicating that in “purely economic matters” the rational relationship test shall apply as the standard of review. At least one commentator12 and one court13 have recognized that these recent irrebuttable presumption cases have probably eroded the validity of Heiner and Schlesinger. Nevertheless, under either the Fifth Circuit or the Supreme Court standard, it is clear that the statutory scheme established by Congress for taxation is entitled to great deference by the courts and shall not be disturbed unless arbitrary and capricious and without a reasonable basis in fact. See Sakol v. Commissioner, supra, 574 F.2d at 698.
In applying the applicable standard to the facts of the case before the Court, we first note that the statutory scheme in question does not necessarily fall within the parameters of the irrebuttable presumption doctrine. The statute does not establish an irrebuttable presumption on its face, and arguably does not establish an irrebuttable presumption at all. The statute does not dictate the actual value of the property held by the taxpayer, but simply provides as a matter of substantive law the manner in which it shall be taxed. Taxation of income is an area in which Congress is allowed great flexibility in order to eliminate tax avoidance. Nevertheless, assuming that the statute does establish an irrebuttable presumption, we hold that the statutory scheme is not arbitrary and capricious and is supported by a reasonable basis in fact.
As the Second Circuit noted in Sakol v. Commissioner, supra, 574 F.2d at 698, applying the rational relationship test of Usery v. Turner Elkhorn Mining Co., supra, 428 U.S. 1, Congress could legitimately have enacted Section 83(a) to eliminate income tax avoidance through the use of restricted stock options. Although in a case such as the present one the sole motive for utilizing *293a stock option plan may not be tax avoidance, the issuance of “lettered” stock allows a corporation to compensate an employee with tax-favored income, except for Section 83(a). The corporation’s choice of the use of a “lettered” stock plan may include both the motive of avoiding securities registration and the motive of providing tax-favored compensation. Thus, the rationale in Sakol regarding the purpose of Section 83(a) applies in this case as well. Congress may legitimately attempt to eliminate tax avoidance by taxing the full fair market value of stock purchased pursuant to the stock option plan without regard to any restrictions, whether contractually imposed or imposed under securities regulations.14 Taxpayers in both situations choose to participate in the stock option plan presumably with full awareness of the tax consequences under Section 83(a). See Sakol v. Commissioner, supra, 574 F.2d at 699. No legitimate reason exists for making a sharp line distinction between the types of restrictions.
The tax scheme imposed under Section 83(a) has a reasonable basis in fact in that the full value of the property purchased or given as compensation is indeed income subject only to temporary restrictions and diminution in value. As we explained in Section I of this opinion, the 65 percent stipulated value was only the monetary amount that taxpayer could receive if the property was immediately sold. The taxpayer, however, received more than the 65 percent stipulated value. The taxing scheme imposed by Congress more accurately reflects what taxpayer received as compensation than a scheme that taxes the taxpayer on merely a portion of the compensation. Thus the taxing scheme has a reasonable basis in fact. As the Second Circuit stated in Sakol v. Commissioner, supra, 574 F.2d at 701, “Congress may clothe the tax incidental to [nonqualified stock plans] with a ready-made, rather than custom-tailored, suit.”
III.
In addition to his constitutional claims, taxpayer makes the final argument that the statutory term “any restriction” does not include restrictions on “lettered” stock imposed under the federal securities laws. Taxpayer argues that the statute applies only to contractually imposed restrictions such as those under consideration in Sakol v. Commissioner, supra, 574 F.2d 694.
First, the plain language of the statute seems to apply to security restrictions as well as contractually imposed restrictions. Secondly, we note that the Treásury Regulations specifically include restrictions under federal and state securities laws as restrictions to be disregarded under Section 83(a). Treas.Reg. § 1.83(h), § 1.83-5(c), Example (3). These regulations must be sustained unless plainly unreasonable or inconsistent with the language of the statute. Fulman v. United States, 434 U.S. 528, 533, 98 S.Ct. 841, 845, 55 L.Ed.2d 1 (1978). These regulations are both reasonable and comport with the language of the statute referring to “any restriction.”
Finally, the legislative history makes no distinction between contractually imposed and legally imposed restrictions. See H.R.Rep.No. 91-413, 91st Cong., 1st Session, reprinted in [1969] U.S.Code Cong. & Ad. News 1645; S.Rep.No. 91-552, 91st Cong., 1st Session, reprinted in [1969] U.S.Code Cong. & Ad. News 2027; Cong.Rep.No. 91-782, 91st Cong., 1st Session, reprinted in [1969] U.S.Code Cong. & Ad. News 2392. Although the committee reports refer primarily to contractually imposed restrictions, the statute was enacted to prevent tax avoidance. Whether this occurs through the use of contractually imposed restrictions or through utilization of securities restrictions in issuing “lettered” stock, the intent of Congress was to prohibit tax abuses. The language of Section 83(a) concerning “any restriction,” therefore, includes restrictions imposed by the federal and state securities laws, such as the restrictions im*294posed in this case. The decision of the Tax Court is
AFFIRMED.
. This case is brought in the name of the appellant and his wife, Phyllis R. Pledger, because they filed jointly with the Internal Revenue Service in the tax years in question. Because Thomas R. Pledger is the primary party in this case, this opinion will hereinafter refer to him as the taxpayer.
. This action was taken in order for the transaction to qualify as a private offering, exempted from registration requirements under the Securities Act of 1933 by § 4(2) of that act. 15 U.S.C. § 77d(2). Stock issued in these private offerings is commonly referred to as “lettered” stock, and is subject to certain restrictions regarding sale under the rules and regulations of the securities laws. This stock may be sold after a two year holding period without regard to restrictions if other conditions are met. Rule 144(d)(1), 17 C.F.R. § 203.144 (1980).
. Appellant calculated the amount of compensation as follows:
Value of Stock on Dates of
Exercise (per appraisals)......... $395,363
Amount Paid for Stock on Dates of Exercise ............... 200,000
Amount Determined to be Compensation (excess of value over amount paid) ......... $195,363
. The Commissioner calculated the amount of compensation as follows:
Value of Stock on Dates of Exercise (per market value) ...... $634,500
Amount Paid for Stock on Dates of Exercise ............... 200,000
Amount Determined to be Compensation.................. $434,500
Amount Reported on 1970 Form 1040 ..................... $195,363
Deficiency....................... $239,137
. 26 U.S.C. § 83(a) (as added by § 321(a) of the Tax Reform Act of 1969, P.L. 91-172, 83 Stat. 487). The statute provides in pertinent part as follows:
Property transferred in connection with performance of services.
(a) General Rule. — If, in connection with the performance of services, property is transferred to any person other than the person for whom such services are performed, the excess of—
(1) the fair market value of such property (determined without regard to any restriction other than a restriction which by its terms will never lapse) at the first time the rights of the person having the beneficial interest in such property are transferable or are not subject to a substantial risk of forfeiture, whichever occurs earlier, over
(2) the amount (if any) paid for such property, shall be included in the gross income of the person who performed such services in the first taxable year in which the rights of the person having the beneficial interest in such property are transferable or are not subject to a substantial risk of forfeiture, whichever is applicable. The preceding sentence shall not apply if such person sells or otherwise disposes of such property in an arm’s length transaction before his rights in such property become transferable or not subject to a substantial risk of forfeiture.
. The government argues that the taxpayer concedes that even if the tax is not appropriate under the Sixteenth Amendment, the tax could be upheld under the general taxing provisions of Article 1, Section 8 if the tax is uniform. The government is correct in arguing that the progressive taxation scheme of the income tax does not affect the finding that the tax imposed in this case is uniform. See Knowlton v. Moore, 178 U.S. 41, 20 S.Ct. 747, 44 L.Ed. 969 *290(1900); Penn Mutual Indem. Co. v. Commissioner, 32 T.C. 653 (1959), aff’d 277 F.2d 16 (3d Cir. 1960). However, because the real arguments in this case center on the issue of income, we base our decision on an analysis under the Sixteenth Amendment.
. Relying on two earlier cases the Court in Eisner stated:
Income may be defined as the gain derived from capital, from labor, or from both combined .... [It is] a gain, a profit, something of exchangeable value proceeding from the property, severed from the capital, however invested or employed, and coming in, being “derived” that is, received or drawn by the recipient (the taxpayer for his separate use, benefit and disposal; that is income derived from property. (Emphasis in original).
. The dissent stresses that our reliance on Sakol is misplaced because of the distinction between govemmentally imposed restrictions and contractually imposed restrictions. Although we do not solely rely on the rationale of that case, the distinction between the two cases is insufficient to require a different result. See note 14 and accompanying text infra.
. The stipulation stated as follows:
11. On the respective dates that petitioner acquired the shares of Bumup & Sims, Inc. under the option, if he had offered said shares for sale in another private placement, such shares would have been subject to a discount of 35 percent from the fair market value of Bumup & Sims, Inc. stock traded over the counter because of the restrictions imposed by the petitioner’s investment letter representations. Rec. at 71.
. At first glance the phrase “something of exchangeable value” in the definition of income under Eisner may seem to imply that the exchangeable value is the value of the property. Although this may be the standard measure for value of income, it does not apply in a case such as this where the property given as compensation is subject to temporary diminutions in value. As noted previously, the definition in Eisner did not establish how much income was received, but only whether income was received. In this case, although something of exchangeable value was received, the value of the income for purposes of taxation could not be determined by its immediate exchangeable value.
. The Second Circuit in Sakol noted that a taxpayer in such a situation would be entitled at least to a capital loss. The Internal Revenue Service has not yet published its position as to whether ordinary treatment or capital treatment would be afforded.
. See L. Tribe, American Constitutional Law § 16-32, 1095 n. 25 (1978) (the early tax cases are “plainly not good law today.)
. Sakol v. Commissioner, supra, 574 F.2d at 698 n. 10.
. See note 8 supra.