Mr. Justice White
delivered the opinion of the Court.
The Internal Revenue Code of 1954 requires that, for estate tax purposes, the “value” of all property held by a decedent at the time of death be included in the gross estate. 26 U. S. C. § 2031. By regulation, the Secretary of the Treasury has determined that shares in open-end investment companies, or mutual funds, are to be valued at their public offering price or “asked” price at the date [547]*547of death. Treas. Reg. on Estate Tax § 20.2031-8 (b) (1963). The question this case presents is whether that determination is reasonable in the context of the market for mutual fund shares.
At the time of her death in 1964, Ethel B. Bennett owned approximately 8,700 shares of three mutual funds that are regulated by the Investment Company Act of 1940, 54 Stat. 789, as amended, 15 U. S. C. § 80a-1 et seq.1 The 1940 Act seeks generally to regulate publicly held companies that are engaged in investing in securities. Open-end investment companies, or mutual funds, “dominate” this industry. 1966 SEC Report 43. Unquestionably, the unique characteristic of mutual funds is that they are permitted, under the Act, to market their shares continuously to the public, but are required to be prepared to redeem outstanding shares at any time. §80a-22(e). The redemption “bid” price that a shareholder may receive is set by the Act at approximately the fractional value per share of the fund’s net assets at the time of redemption. § 80a-2 (a) (32). In contrast, the “asked” price, or the price at which the fund initially offers its shares to the public, includes not only the net asset value per share at the time of sale, but also a fixed sales charge or “sales load” assessed by the fund’s principal underwriter who acts as an agent in marketing the fund’s shares. § 80a-2 (a) [548]*548(35).2 Sales loads vary within fixed limits from mutual fund to mutual fund, but all are paid to the fund’s underwriters; the charges do not become part of the assets of the fund.3 The sales loads of the funds held by the decedent ranged from seven and eight percent to one percent of the fractional net asset value of the funds’ shares.
[549]*549Private trading in mutual fund shares is virtually nonexistent.4 Thus, at any given time, under the statutory scheme created by the Investment Company Act, shares of any open-end mutual fund with a sales load are being sold at two distinct prices. Initial purchases by the public are made from the fund, at the “asked” price, which includes the load. But shareholders “sell” their shares back to the fund at the statutorily defined redemption or bid price.
Respondent is the executor of the decedent's estate. On the federal estate tax return, he reported the value of the mutual fund shares held by the decedent at their redemption price, which amounted to about $124,400. The Commissioner assessed a deficiency based upon his valuation of the shares at their public offering or asked price, pursuant to Treas. Reg. § 20.2031-8 (b).5 Valued [550]*550on that basis, the shares were worth approximately $133,300. Respondent paid the deficiency of about $3,100, including interest, filed a timely claim for a refund, and, when that claim was denied, commenced a refund action in Federal District Court on the ground that the valuation based on § 20.2031-8 (b) was unreasonable. The District Court agreed with respondent and held the Regulation invalid. 323 F. Supp. 769. The Court of Appeals affirmed. 457 F. 2d 567. We granted the Government’s petition for certiorari, 409 U. S. 840, because of the conflict among the circuits.6
We recognize that this Court is not in the business of administering the tax laws of the Nation. Congress has delegated that task to the Secretary of the Treasury, 26 U. S. C. § 7805 (a), and regulations promulgated under his authority, if found to “implement the congressional mandate in some reasonable manner,” must be upheld. United States v. Correll, 389 U. S. 299, 307 (1967). See Bingler v. Johnson, 394 U. S. 741, 749-751 (1969); Commissioner v. South Texas Lumber Co., 333 U. S. 496, 501 (1948). But that principle is to set the framework for judicial analysis; it does not displace it. We find that the contested regulation is unrealistic and unreasonable, and therefore affirm the judgment of the Court of Appeals.
In implementing 26 U. S. C. § 2031, the general principle of the Treasury Regulations is that the value of [551]*551property is to be determined by its fair market value at the time of the decedent’s death. “The fair market value is the price at which the property would change hands between a willing buyer and a willing seller, neither being under any compulsion to buy or to sell and both having reasonable knowledge of relevant facts.” Treas. Reg. § 20.2031-1 (b). The willing buyer-willing seller test of fair market value is nearly as old as the federal income, estate, and gifts taxes themselves, and is not challenged here.7 Under this test, it is clear that if the decedent had owned ordinary corporate stock listed on an exchange, its “value” for estate tax purposes would be the price the estate could have obtained if it had sold the stock on the valuation date, that price being, under Treas. Reg. § 20.2031-2 (b), the mean between the highest and lowest quoted selling prices on that day. Respondent urges that similar treatment be given mutual fund shares and that, accordingly, their value be measured by the redemption price at the date of death, the only price that the estate could hope to obtain if the shares had been sold.
Respondent’s argument has the clear ring of common sense to it, but the United States maintains that the redemption price does not reflect the price that a willing buyer would pay, inasmuch as the mutual fund is under a statutory obligation to redeem outstanding shares whenever they are offered. According to the Government, the only market for mutual fund shares that has both willing buyers and willing sellers is the public offering market. Therefore, the price in that market, the asked [552]*552price, is an appropriate basis for valuation. The central difficulty with this argument is that it unrealistically bifurcates the statutory scheme for the trading in mutual fund shares. To be sure, the fund is under an obligation to redeem its shares at the stated price. 15 U. S. C. § 80a-22 (e). But, at the time of the original purchases, both the fund and the purchasers are aware of that duty and both willingly enter into the sale transactions nonetheless. As Judge Winner correctly observed in Hicks v.
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Mr. Justice White
delivered the opinion of the Court.
The Internal Revenue Code of 1954 requires that, for estate tax purposes, the “value” of all property held by a decedent at the time of death be included in the gross estate. 26 U. S. C. § 2031. By regulation, the Secretary of the Treasury has determined that shares in open-end investment companies, or mutual funds, are to be valued at their public offering price or “asked” price at the date [547]*547of death. Treas. Reg. on Estate Tax § 20.2031-8 (b) (1963). The question this case presents is whether that determination is reasonable in the context of the market for mutual fund shares.
At the time of her death in 1964, Ethel B. Bennett owned approximately 8,700 shares of three mutual funds that are regulated by the Investment Company Act of 1940, 54 Stat. 789, as amended, 15 U. S. C. § 80a-1 et seq.1 The 1940 Act seeks generally to regulate publicly held companies that are engaged in investing in securities. Open-end investment companies, or mutual funds, “dominate” this industry. 1966 SEC Report 43. Unquestionably, the unique characteristic of mutual funds is that they are permitted, under the Act, to market their shares continuously to the public, but are required to be prepared to redeem outstanding shares at any time. §80a-22(e). The redemption “bid” price that a shareholder may receive is set by the Act at approximately the fractional value per share of the fund’s net assets at the time of redemption. § 80a-2 (a) (32). In contrast, the “asked” price, or the price at which the fund initially offers its shares to the public, includes not only the net asset value per share at the time of sale, but also a fixed sales charge or “sales load” assessed by the fund’s principal underwriter who acts as an agent in marketing the fund’s shares. § 80a-2 (a) [548]*548(35).2 Sales loads vary within fixed limits from mutual fund to mutual fund, but all are paid to the fund’s underwriters; the charges do not become part of the assets of the fund.3 The sales loads of the funds held by the decedent ranged from seven and eight percent to one percent of the fractional net asset value of the funds’ shares.
[549]*549Private trading in mutual fund shares is virtually nonexistent.4 Thus, at any given time, under the statutory scheme created by the Investment Company Act, shares of any open-end mutual fund with a sales load are being sold at two distinct prices. Initial purchases by the public are made from the fund, at the “asked” price, which includes the load. But shareholders “sell” their shares back to the fund at the statutorily defined redemption or bid price.
Respondent is the executor of the decedent's estate. On the federal estate tax return, he reported the value of the mutual fund shares held by the decedent at their redemption price, which amounted to about $124,400. The Commissioner assessed a deficiency based upon his valuation of the shares at their public offering or asked price, pursuant to Treas. Reg. § 20.2031-8 (b).5 Valued [550]*550on that basis, the shares were worth approximately $133,300. Respondent paid the deficiency of about $3,100, including interest, filed a timely claim for a refund, and, when that claim was denied, commenced a refund action in Federal District Court on the ground that the valuation based on § 20.2031-8 (b) was unreasonable. The District Court agreed with respondent and held the Regulation invalid. 323 F. Supp. 769. The Court of Appeals affirmed. 457 F. 2d 567. We granted the Government’s petition for certiorari, 409 U. S. 840, because of the conflict among the circuits.6
We recognize that this Court is not in the business of administering the tax laws of the Nation. Congress has delegated that task to the Secretary of the Treasury, 26 U. S. C. § 7805 (a), and regulations promulgated under his authority, if found to “implement the congressional mandate in some reasonable manner,” must be upheld. United States v. Correll, 389 U. S. 299, 307 (1967). See Bingler v. Johnson, 394 U. S. 741, 749-751 (1969); Commissioner v. South Texas Lumber Co., 333 U. S. 496, 501 (1948). But that principle is to set the framework for judicial analysis; it does not displace it. We find that the contested regulation is unrealistic and unreasonable, and therefore affirm the judgment of the Court of Appeals.
In implementing 26 U. S. C. § 2031, the general principle of the Treasury Regulations is that the value of [551]*551property is to be determined by its fair market value at the time of the decedent’s death. “The fair market value is the price at which the property would change hands between a willing buyer and a willing seller, neither being under any compulsion to buy or to sell and both having reasonable knowledge of relevant facts.” Treas. Reg. § 20.2031-1 (b). The willing buyer-willing seller test of fair market value is nearly as old as the federal income, estate, and gifts taxes themselves, and is not challenged here.7 Under this test, it is clear that if the decedent had owned ordinary corporate stock listed on an exchange, its “value” for estate tax purposes would be the price the estate could have obtained if it had sold the stock on the valuation date, that price being, under Treas. Reg. § 20.2031-2 (b), the mean between the highest and lowest quoted selling prices on that day. Respondent urges that similar treatment be given mutual fund shares and that, accordingly, their value be measured by the redemption price at the date of death, the only price that the estate could hope to obtain if the shares had been sold.
Respondent’s argument has the clear ring of common sense to it, but the United States maintains that the redemption price does not reflect the price that a willing buyer would pay, inasmuch as the mutual fund is under a statutory obligation to redeem outstanding shares whenever they are offered. According to the Government, the only market for mutual fund shares that has both willing buyers and willing sellers is the public offering market. Therefore, the price in that market, the asked [552]*552price, is an appropriate basis for valuation. The central difficulty with this argument is that it unrealistically bifurcates the statutory scheme for the trading in mutual fund shares. To be sure, the fund is under an obligation to redeem its shares at the stated price. 15 U. S. C. § 80a-22 (e). But, at the time of the original purchases, both the fund and the purchasers are aware of that duty and both willingly enter into the sale transactions nonetheless. As Judge Winner correctly observed in Hicks v. United States, 335 F. Supp. 474, 481 (Colo. 1971):
“Viewing the contract in this light meets every test of the ‘willing buyer-willing seller’ definition usually applied in the determination of market value. The ‘willing buyer’ is the fully informed person who agrees to buy the shares, agreeing at that time to sell them to the fund' — -the only available repurchaser — -at the redemption price. The ‘willing seller’ is the fund which sells the shares at market value plus a load charge, and which agrees to buy the shares back at market less the load charge. That is the market, and it is the only market. It is a market made up of informed buyers and an informed seller, all dealing at arm’s length.”
In the context of the Investment Company Act, the redemption price may thus be properly viewed only as the final step in a voluntary transaction between a willing buyer and a willing seller. As a matter of statutory law, holders of mutual fund shares cannot obtain the “asked” price from the fund. That price is never paid by the fund; it is used by the fund when selling its shares to the public — and even then the fund receives merely the net asset value per share from the sale, with the sales load being paid directly to the underwriter. In short, the only price that a shareholder may realize and that the fund — the only buyer — will pay is the redemption [553]*553price. In the teeth of this fact, Regulation § 20.2031-8 (b) purports to assign a value to mutual fund shares that the estate could not hope to obtain and that the fund could not offer.
In support of the Regulation, the Government stresses that many types of property are taxed at values above those which could be realized during an actual sale. For example, ordinary corporate stock is valued at its fair market price without taking into account the brokerage commission that a seller must generally pay in order to sell the stock. Respondent does not contend that that approach is inappropriate or that, for example, the value of ordinary stock in an estate should be the market price at the time less anticipated brokerage fees. But § 20.2031-8 (b) operates in an entirely different fashion. The regulation includes as an element of value the commission cost incurred in the hypothetical purchase of the mutual fund shares already held in the decedent’s estate. If that principle were carried over to the ordinary stock situation, then a share traded at $100 on the date of death would be valued, not at $100 as it now is, but at, say, $102, representing the "value” plus the fee that a person buying the stock on that day would have to pay. It hardly need be said that such a valuation method is at least inconsistent with long-established Treasury practice and would appear at odds with the basic notions of valuation embodied in the Internal Revenue Code.8 See Estate of Wells v. Commissioner, 50 T. C. 871, 880 (1968) (Tannenwald, J., dissenting).
Even if it were assumed that the public offering price were somehow relevant to the value of mutual fund shares [554]*554privately held, there would still be the difficulty that shares so held are, in important respects, similar to ordinary corporate stock held subject to a restrictive agreement (such as a first-refusal right at a specified price). With respect to the value of such stock, the Treasury Regulations have provided that the price that may be obtained in the marketplace does not control. Rather, so long as the restriction is a bona fide one, the value of the shares in the hands of the restricted stockholder is determined in accordance with the terms of the restriction. Treas. Reg. § 20.2031-2 (h). Outstanding mutual fund shares are likewise held subject to a restriction, as the Court of Appeals noted. 457 F. 2d, at 571. Those shares may not be “sold” at the public offering price. By statute, they may be “sold” back to the mutual fund only at the redemption price. We see no valid justification for disregarding this reality connected with the ownership of mutual fund shares.
The Government nevertheless argues that Treas. Reg. § 20.2031-8 (b) reasonably values the “bundle of rights” that is transferred with the ownership of the mutual fund shares.9 For this argument, heavy reliance is placed on this Court’s decisions in Guggenheim v. Rasquin, 312 U. S. 254 (1941); Powers v. Commissioner, 312 U. S. 259 (1941); United States v. Ryerson, 312 U. S. 260 (1941), which held that the cash-surrender value of a single-premium life insurance policy did not necessarily represent its only taxable value for federal gift tax pur[555]*555poses.10 In Guggenheim,, the lead case, the taxpayer purchased single-premium life insurance policies with an aggregate face value of one million dollars for approximately $852,000 and, shortly thereafter, gave the policies to her children. On the gift tax return, the policies were listed at their cash-surrender value of about $717,000— admittedly the only amount the donor or the donees could receive, if the policies were surrendered. But the Commissioner valued the gift at the cost of the policies, and this Court upheld that valuation: “the owner of a fully paid life insurance policy has more than the mere right to surrender it; he has the right to retain it for its investment virtues and to receive the face amount of the policy upon the insured’s death. That these latter rights are deemed by purchasers of insurance to have substantial value is clear from the difference between the cost of a single-premium policy and its immediate or early cash-surrender value . . . .” 312 U. S., at 257. Because the “entire bundle of rights in a single-premium policy” is so difficult to give a realistic value to, the Court deferred to the Commissioner’s determination and permitted valuation to be based on cost: “Cost is cogent evidence of value.” Id., at 258. But as the District Court observed, 323 F. Supp., at 773, shares in mutual funds are quite unlike insurance policies, particularly in light of the policyowner’s right to receive the full face value of the policy upon the insured’s death. Moreover, mutual fund shares present no analogous difficulties in [556]*556valuation. On any given day, their commercial value may be determined by turning to the financial pages of a newspaper. Obviously, with respect to mutual funds, there are “investment virtues” and the prospects of capital gains or dividends. But that is true of any corporate security. Nonetheless, shareholders in mutual funds are singled out by the Regulation and their holdings valued at an unrealistic replacement cost — -which includes “brokers’ commissions” — while other shareholdings are valued without regard to such commissions.
The unrealistic nature of this difference in treatment may be demonstrated by comparing the treatment of shares in load funds, such as the decedent’s, with shares in no-load funds. Obviously, even if it could be argued that there are relevant differences between mutual fund shares generally and corporate stock, there are no differences in terms of “investment virtues” or related interests between no-load and load fund shares. Indeed, as the terms imply, the only real distinction between the two is that one imposes an initial sales charge and the other does not.11 Nonetheless, under the Regulation, a share in a no-load fund is valued at its net asset value while a share in a load fund is valued at net asset value plus sales charge. To further illustrate, consider a decedent who had purchased one share in each of two no-load mutual funds, at $100 per share. The decedent died before either appreciated, but after one of the funds had changed to a load fund. Although both shares are still worth $100, and could be redeemed for only that amount, the Regulation would require that one be valued at $100 and the other at $100 plus the new load charge. A regulation that results in such differing treatment of identical property should be supported by something more than a transparent analogy to life insurance.
[557]*557We recognize that normally “Treasury regulations must be sustained unless unreasonable and plainly inconsistent with the revenue statutes.” Commissioner v. South Texas Lumber Co., 333 U. S., at 501. But even if the Regulation contested here is not, on its face, technically inconsistent with § 2031 of the Internal Revenue Code, it is manifestly inconsistent with the most elementary provisions of the Investment Company Act of 1940 and operates without regard for the market in mutual fund shares that the Act created and regulates. Cf. L. E. Shunk Latex Products, Inc. v. Commissioner, 18 T. C. 940 (1952). Congress surely could not have intended § 2031 to be interpreted in such a manner. The Regulation also imposes an unreasonable and unrealistic measure of value. We agree with Judge Tannenwald, who stated at the very outset of the dispute over Regulation § 20.2031-8 (b), that “it does not follow that, because [the Commissioner] has a choice of alternatives, his choice should be sustained where the alternative chosen is unrealistic. In such a situation the regulations embodying that choice should be held to be unreasonable.” Estate of Wells v. Commissioner, 50 T. C., at 878 (dissenting opinion).
The judgment of the Court of Appeals is affirmed.
It is so ordered.