This is an appeal by the executors of the will of Giovanni (John) Vai from an order fixing an inheritance tax and overruling objections to a report of the inheritance tax appraiser imposing a tax on property placed in trust for John’s daughter under the terms of his will. The question for determination is whether an inheritance tax may be levied on property which a testator leaves to a daughter by will pursuant to a valid contract entered into during his lifetime. We hold, for reasons which shall hereinafter appear, that such a bequest is not subject to an inheritance tax if the testator has received full consideration in money or money’s worth, within the meaning of the inheritance tax law, for the promised bequest.
John and Tranquilla Vai were married in 1907. They had one daughter, Madeline (now 40 years old) who is mentally arrested and requires constant care and attention. After a period of marital discord, Tranquilla filed an action for separate maintenance against John. In March 1953 they entered into a property settlement agreement through which Tranquilla was to receive less than half the community property but John undertook to support Madeline during his lifetime, to hold his wife harmless for Madeline’s support, and to provide in his will that a sufficient amount of property he left in trust for Madeline to support her as long as she lived.1
*147Subsequently, Tranquilla’s action for separate maintenance was abandoned, but she left the family home and moved to another residence.
In April 1953 John executed a will in which he carried out the obligations imposed upon him by the agreement and left the residue of his estate in a trust under the terms of which the income would be paid to Madeline’s guardian for her support and maintenance. He died on February 14,1957.
It is estimated that the cost of supporting Madeline is $2,500 a month and, when this amount is capitalized, it represents a liability of $515,341.56 as of the date of John’s death. The value of the residue considerably exceeded the amount necessary for Madeline’s support, but the issue in controversy here is confined to the taxability of the $515,341.56. The inheritance tax appraiser representing the Controller, petitioner in this proceeding, imposed a tax on the entire residue, and the executors objected to his report, claiming that $515,341.56 should be allowed as a deduction for the purpose of calculating the inheritance tax due because assertedly this sum was left by John in satisfaction of a valid obligation, supported by adequate consideration. The probate court overruled the objections, and the executors appeal from the court’s order.
Shortly after John’s death, Tranquilla brought an action to rescind the property settlement agreement on the ground that John had fraudulently concealed community assets from her. We held, in Vai v. Bank of America (1961) 56 Cal.2d 329 [15 Cal.Rptr. 71, 364 P.2d 247], that John had committed constructive fraud as a matter of law and that Tranquilla was entitled to rescind the agreement.2 This decision and its consequences will be discussed in the portion of this opinion concerned with the question of consideration.
*148Section 13601 of the Revenue and Taxation Code provides, “A transfer by will or the laws of succession of this State from a person who dies seized or possessed of the property transferred while a resident of this State is a transfer subject to this part.” (Italics added.) The executors, in contending that the money left for Madeline’s support is not taxable, assert that it was transferred to her pursuant to the property settlement agreement between John and Tranquilla rather than “by will,” that as soon as the agreement was signed Madeline had a vested right to support from her father which she could have enforced as a third party beneficiary in an action for damages or quasi-specific performance without regard to the will, and that the will was merely the instrument by which John’s obligation under the agreement was performed. They place reliance primarily upon Estate of Belknap (1944) 66 Cal.App.2d 644 [152 P.2d 657]. In discussing this contention, we shall first assume arguendo that John received adequate consideration within the meaning of the inheritance tax law for his bequest to Madeline and that the property settlement agreement is valid and sufficiently certain in all respects.
In Estate of Belknap (1944) supra, 66 Cal.App.2d 644, a husband and wife entered into a property settlement agreement which provided that the wife was to receive a stipulated monthly sum during the husband’s lifetime and that he would authorize his executor by the terms of his will to purchase a $20,000 annuity for her, from which she would receive the income. It was held that the value of the annuity bonds was not subject to inheritance tax because the transfer was effected by virtue of the property settlement agreement rather than by means of the will. The court found that the will was merely the conduit through which the husband’s obligations under the agreement were fulfilled, that the amount of the wife’s interest in the husband’s property was fixed by the agreement and was not changed by the will, that the provision in the will for the purchase of the bonds merely secured the vested interests transferred by the agreement, and that the agreement was enforceable by the wife without regard to the will.
The rationale of Belknap is apposite here. If John had failed to carry out his obligations under the property settlement agreement Madeline could have enforced her rights as a third party beneficiary by an action at law for damages or by an equitable action for quasi-specific performance. (Brown v. *149Superior Court (1949) 34 Cal.2d 559, 563-564 [212 P.2d 878].) The will could neither add to nor subtract from the benefits to which she was entitled by the agreement and, as in Belknap, the will was merely the conduit through which John’s obligations under the agreement were performed. While the enjoyment of the benefits Madeline was to receive under the will and the actual transfer of the property to her were postponed until John’s death, her right to receive such benefits upon his death arose immediately upon the signing of the agreement, and the will was merely the instrumentality through which he fulfilled his obligations. Madeline’s interest cannot be rendered taxable by the mere fact that John performed, by a provision in his will, an obligation for which his estate would have been liable in any event.
The Controller argues that Belknap is distinguishable because there the amounts the husband agreed to pay were specified in the agreement, whereas in the present case the sums which John was to provide for Madeline’s support during her lifetime and at his death were not specified and could vary, depending upon the size of John’s estate and Madeline’s needs.3 This argument goes to the question whether the property settlement agreement in the present ease is enforceable and sufficiently certain, but does not relate to whether, assuming the enforceability of the agreement, the life estate must nevertheless be deemed taxable as a transfer by will.4 Moreover, the amount which Madeline needed for her support readily could have been made certain by being reduced to a monetary sum, as was done in the present proceeding, and John’s promise in the agreement to leave her an amount of money in his will which would be necessary for her support was not made contingent upon the size of his estate.
*150In re Howell’s Estate (1931) 255 N.Y. 211 [174 N.E. 457], cited by the Controller, is distinguishable. There, the separation agreement provided that the wife would receive under her husband’s will one-third of the net income from his estate. The court held that the agreement did not recognize the existence of a specific debt and that the husband agreed only to devise a portion of his estate if he had one. In the present case, John agreed to provide sufficient funds in his will for Madeline’s support, regardless of the size or character of his estate.
The Controller relies principally on the case of Estate of Grogan (1923) 63 Cal.App. 536 [219 P. 87], in support of his claim that Madeline’s interest is subject to a tax. In Grogan a husband and wife entered into a property settlement agreement which provided that the husband would pay his wife $3,000 a year during his lifetime and that, after his death, she would receive the income from a trust fund created by his will, which would consist of one-half of his estate, but not exceeding $50,000. The parties were subsequently divorced, and the husband made a will in conformity with the agreement. A tax was imposed on the value of the life estate created in the will and the wife claimed, as do the executors in the present case, that the will merely operated as the fulfillment of the obligation of the husband under the agreement and did not constitute a bequest or transfer within the meaning of the statutes governing inheritance taxes. Section 2 of the inheritance tax act provided at the time, “A tax shall be, and is, hereby imposed upon the transfer of any property . . . (1) When the transfer is by will.” The court, after reviewing authorities from a number of jurisdictions, held that every transfer in the nature of a change of ownership effected through a will was subject to an inheritance tax under the statute.
The Grogan opinion states, at page 544, “No exception of the character claimed by appellant here is mentioned in the California statute. Nothing is said about any transfer by will arising out of an agreement, or as compensation for service, or in consideration of anything whatsoever. It matters not whether the legacy be a gratuity or ‘for money’s worth.’ There is nothing in the statute which would indicate an intention on the part of the legislature that there should be any limitation on the apparently plain language contained therein, or that there should be any exception whatsoever thereto. Everything in the nature of a change of ownership effected through a will is apparently included. The reason for such *151transfer is not taken into consideration. The result is all that is considered; that is, the transfer itself. Viewed from one standpoint, it might be said that Mrs. Grogan’s right was one which rested in the agreement entered into between her and her husband; that she had in effect bought and paid for everything that she was to receive, and that nothing remained to be done but the turning over of the property to her through the medium of the will. But even that does not surmount the obstacle. . . . The statute here does not provide for a tax because someone has a right arising out of a debt or otherwise, but only when a transfer of property is brought about by means of a will is a tax imposed. It is a tax upon the vehicle carrying the right, rather than a tax upon the right itself. It is in effect a declaration of law that when a will is used as a means of conveyance of property a tax must he paid for that privilege.” (Accord, In re Gould’s Estate (1898) 156 N.V. 423 [51 N.E. 287].)
We conclude that the foregoing unequivocal rule of Grogan must he disapproved, for it makes the imposition of the tax dependent upon form rather than substance. The inheritance tax is imposed on the beneficial succession to property. (Estate of Barter (1947) 30 Cal.2d 549, 557 [184 P.2d 305] ; Estate of Madison (1945) 26 Cal.2d 453, 458 [159 P.2d 630].) Grogan holds that everything in the nature of a change of ownership effected through a will is taxable because the tax is on the vehicle carrying the right rather than on the right itself and that, therefore, a bequest in a will in payment of a debt is subject to a tax. The anomalous result of this rule is that a tax must be levied whenever a testator provides in his will that a creditor is to receive a stated sum in payment of a debt owed by the testator, whereas the tax would be avoided by the mere failure of the testator to specify that the debt be paid, requiring the creditor to receive payment by means of filing a claim against the estate. The Legislature could not have intended to make the imposition of the tax depend upon such fortuitous considerations.
Moreover, as the executors correctly argue, acceptance of the rule in Grogan would place a premium on the violation of agreements similar to the one involved here. If John had breached his agreement and failed to provide in his will for Madeline’s support and she had recovered the value of her life estate in an action for damages against the estate, the amount of her recovery would not be, under Grogan, a transfer of property “brought about by means of a will” and, presum*152ably no tax liability would attach. 5 . As suggested above when the testator provides in his will for the payment of a valid obligation supported by adequate consideration within the meaning of the inheritance tax law and the obliga tion would have been enforceable without regard to the provi sions of the will it is erroneous to conclude that the payment is taxable as a "transfer by wilL" The case of Estate of Grogan (1923) supra 63 Cal.App. 536 is disapproved insofar as it is incoiisiatent with the views expressed herein. 6
As a result of this conclusion, we must also hold that the provisions of sections 13601-13603 (a) of title 18 of the California Administrative Code, which are in accord with the Grogan rule, do not represent a correct interpretation of legislative intent.7
*153Another contention made by the Controller is that Madeline’s life estate must be held subject to taxation under the provisions of section 13981 of the Revenue and Taxation Code. The section provides, “This article [article 2, relating to deductions] is a limitation on deductions allowable. It is not intended by this article to allow as a deduction anything that does not actually reduce the amount of an inheritance or transfer.” It is the Controller’s claim that, whether Madeline takes the value of her life estate as a creditor or as a legatee she gets the same amount of money from the estate, and that the value of the life estate cannot be allowed as a deduction because it “does not actually reduce the amount of an inheritance or transfer. ’ ’
It is true that Madeline’s resources would be the same whether she is a creditor or a legatee, but only because in the present case she fortuitously occupies the role of residuary legatee and at the same time a posture similar to that of a creditor insofar as John received consideration for his promise to leave property to her. Section 13981 could not have been intended to penalize her merely because she receives property in this dual capacity. We conclude, therefore, that the word “transfer” as used in the section was not intended to relate to a situation in which the beneficiary has a right to receive the transfer independently of the will.
The property left by John for Madeline’s support is free from taxation only if the circumstances indicate that he received adequate consideration for his promise to leave it to her. We come, therefore, to the question whether such consideration is present here. The executors urge that we must assume that John received consideration for his promise to support Madeline because the property settlement agreement was in writing (Civ. Code, § 1614), and that, therefore, John left the amount in question to Madeline in satisfaction of a valid obligation supported by an adequate consideration.
The difficulty with this contention is the assumption that, merely because there may be sufficient consideration as between the spouses in a property settlement agreement, it necessarily follows that there is also consideration for purposes of determining whether an inheritance tax is due. This conclusion is unwarranted. While a grossly disproportionate division of property between spouses does not render the agreement void for inadequate consideration, since intangible
*154factors as well as the property received by the parties are weighed in the balance in determining the adequacy of consideration as between spouses, the tax consequences of the contract are another matter. (Cf. Chemical Bank New York Trust Co. v. United States (1966) 249 E.Supp. 450, 459-460.) Obviously, there are unlimited contrivances for avoidance of the inheritance tax by the device of a bequest in fulfillment of an obligation undertaken in a property settlement agreement, for which the testator does not receive a full consideration in money or money’s worth.
We are aided in determining what constitutes consideration for tax purposes by the provisions of the Revenue and Taxation Code relating to inter vivos transfers. (Rev. & Tax. Code, §§ 13641-13648.) These sections provide that where a testator has made an actual transfer of property during his lifetime, the transfer is taxable under the inheritance tax law to the extent that it was made without a valuable consideration, if the testator retained certain specified incidents of ownership over the property while he was alive.8 The purpose of these provisions is to prevent evasion of the inheritance tax. (Estate of Madison (1945) supra, 26 Cal.2d 453, 463.) At the time of John’s death, section 13641 of the code provided that as to inter vivos transfers, a valuable and adequate consideration was consideration in money or money’s worth to the full value of the property transferred9 and sections 13641-13648 (a) of title 18 of the California Administrative Code provide that consideration in money or money’s worth does not include any consideration which is not reducible to money or a money value, such as love or affection or a promise of marriage.
Analogism dictates that we apply the same standard of *155consideration in the situation involved here, where no actual transfer of property occurred during the testator’s lifetime but the right to the transfer upon the testator’s death is based on a valid contract into which he had entered. If we accepted the view that what is consideration between the parties to an agreement in the situation involved here must also be deemed consideration for the purpose of determining whether an inheritance tax is payable, it would mean that property transferred by a testator who makes an actual transfer during his lifetime but retains some incidents of control over it, is subject to a greater tax burden than property over which a decedent has retained complete ownership during his life. The Legislature could not have intended such an anomalous result.
We must determine, therefore, whether John received consideration in money or money’s worth under the definition set forth above, for his promise to leave money in his will for Madeline’s support, for it is only to this extent that the amount in question is free from the inheritance tax. As stated above, a short time after John’s death, Tranquilla brought an action to rescind the property settlement agreement on the ground that John had fraudulently concealed community assets from her. The trial court found against Tranquilla, but in Vai v. Bank of America (1961) supra, 56 Cal.2d 329, we held that she was entitled to rescind the agreement. Subsequently, Tranquilla entered into a stipulation with the executors under which she received $500,000 as damages for John’s fraud. She also waived her rights under the property settlement agreement, except the right to have John carry out his obligations for Madeline’s support. Judgment by stipulation was entered, setting forth the terms of the settlement and decreeing that the agreement between John and Tranquilla was valid.
In determining whether John received consideration for his promise, we cannot ignore events which occurred after his death, insofar as they affected the terms of the original agreement. In addition to the amount specified in the original agreement,10 Tranquilla received $500,000 as compensation for John’s fraud. However, if she had rescinded the original agreement, as she was entitled to do, she would in all likelihood have been entitled to considerably more than these sums, since John’s estate at the time of his death amounted to over *156$1,800,000. The estate was enriched, therefore, to the extent that she received less than she was entitled to by rescission. Under these unusual circumstances, the question of the extent to which John received consideration for the $515,341.56 must be measured by the difference between what Tranquilla would have received, had she rescinded the agreement, and what she actually received under the agreement and the subsequent compromise settlement. This is the measure of the consideration received by John for his promise to leave money in trust for Madeline’s support and is, accordingly, the limit of the deduction allowable. The record does not contain information sufficient to permit this court to make the necessary calculations, and the matter must therefore be returned to the probate court for the purpose of ascertaining the deduction allowable.
The executors contend that consideration for John’s promise to support Madeline may be found in the provisions of the agreement that he would only be liable for $10,000 of Tranquilla’s attorney’s fees, that he could retain all income from tax refunds as his separate property, and that he was free from liability for Tranquilla’s obligations. There is no indication in the record as to the amount of Tranquilla’s attorney’s fees and no claim that she had any unpaid obligations or that John expected to or did receive any tax refunds. The fact that John was entitled to Madeline’s custody cannot be viewed as consideration “in money or money’s worth’ ’ as that term is defined above.
The order is reversed for further proceedings consistent with the views expressed herein.
McComb, J., Peters, J., Tobriner, J., Peek, J., and Burke, J., concurred.
Article IV of the property settlement agreement provides in part, ‘ ‘ The Husband covenants and agrees to assume full responsibility for the support, maintenance and care of said Madeline Vai and represents that he has heretofore made a Will wherein and whereby a trust is created for the support, maintenance and care of said Madeline Vai after the death of the Husband. The Husband hereby covenants and agrees and binds himself to maintain in full force and effect, a Last Will and Testament which shall provide for the distribution into a trust of which such trust said Madeline Vai or her duly appointed guardian shall be the beneficiary, an amount of money or property as will, upon the Husband’s death, fairly and adequately pay for and discharge any and all expense for the care, support and maintenance of said Madeline Vai during the remainder of her lifetime. The Hus*147band further covenants and agrees to hold harmless the Wife during the balance of the lives of the parties hereto, for the care, support and maintenance of said Madeline Vai.” The will ‘ ‘heretofore made” referred to in this provision was apparently revoked and a new will executed by John in April 1953.
The executors claim that we merely held in the Vai ease that Tranquilla was not barred from rescinding the agreement by laches. However, the opinion, after holding that John was guilty of constructive fraud as a matter of law, states, "It is manifest from the foregoing that plaintiff is neither estopped nor barred by laches from seeking to rescind the property settlement agreement, and that she is entitled to the relief sought because of the constructive fraud of her husband.” (Italics added.) (56 Cal.2d at p. 344.) The relief Tranquilla sought is described at page 333 of the opinion as rescission of the agreement on the ground of fraud, recovery of part of the property received by John under the agreement, and damages in the event recovery thereof cannot be obtained.
The agreement provided only that the will would leave in trust for Madeline's benefit "an amount of money or property as will . . . fairly and adequately pay for and discharge any and all expense ’ ’ for Madeline's care and support.
The Controller also contends that there is language in the agreement in Belknap which distinguishes it from the contract involved here. In Belknap it was provided, "Said party of the first part does by these presents, promise and agree by and through his Last Will and Testament and does hereby authorise, empower, direct and command the Executor of his said Last Will and Testament, to purchase immediately upon his appointment an annuity . . . .” While it is true that this provision purported to give a present direction to the executor to carry out the terms of the agreement, and article IV of the agreement between John and Tranquilla, quoted in footnote 1, only recites that John shall keep in full force and effect a will which would carry out his obligations, this difference seems of little significance.
The Controller relies on In re Kidd’s Estate (1907) 188 N.Y. 274 [80 N.E. 924], for the proposition that if Madeline had sued the estate to recover the amount to which she would have been entitled under the property settlement agreement, she would nevertheless have been required to pay an inheritance tax on the sum she recovered. In Kidd, a testator failed to carry out the terms of an agreement to leave property to a stepdaughter in Ms will, and she successfully prosecuted an action to recover the property which he had agreed to convey to her. It was held that she was required to pay an inheritance tax on the amount of the judgment because she would have been subject to the tax if the decedent had performed his agreement. If Grogan is correct in holding that the basis on wMch the inheritance tax is imposed is that a will is used as the means of carrying out the testator’s intention, it would seem to follow that if the beneficiary receives the property by means of a court judgment rather than under the will, the property is not taxable as a transfer Toy •will. This distinction was recognized in In re Gould’s Estate (N.Y. 1898) supra, 51 N.E. 287, a ease upon which the Controller also relies, in which it was stated that if the beneficiary of a contract to make a will had elected to recover by bringing a suit against the estate on the basis of the contract rather than by accepting the bequest in the will, the amounts recovered in such a suit would not have been subject to the tax because there would have been no transfer by will.
It has been suggested that Grogan has been overruled in Estate of Rath (1937) 10 Cal.2d 399 [75 P.2d 509, 115 A.L.R. 836]. However, that ease involved a different factual situation and Grogan was specifically mentioned as being distinguishable. In Bath, a husband and wife entered into an agreement under which the wife agreed to leave her separate property to her husband if he survived her, and the husband agreed to leave so much of the property as was not necessary for his support to the wife’s nephews, upon his death. The husband carried out his promise, and the court held that the property was not taxable as a transfer from the husband to the nephews, since he was merely a trustee of the property for them, but was taxable as a transfer from the wife’s estate to the nephews. The opinion distinguishes Grogan on the ground that it involved a situation in which the testator disposed of Ms own property, not property held by him in trust for others. (10 Cal.2d at p. 407.)
The section provides: “A transfer by will is subject to the Inheritance Tax Law even though made pursuant to an agreement between the transferee and the decedent for an adequate and full consideration in money or money’s worth which was received by the decedent. In such ease, the trans*153feree takes from the decedent under the will and not by virtue of the agreement. ’ ’
JFor example, an inter vivos transfer is taxable to the extent that the testator has failed to receive consideration for it where the transfer is made in contemplation of death (Rev. & Tax. Code, § 13642), whore possession or enjoyment does not take place until after the death of the testator (Rev. & Tax. Code, § 13643), where he has retained a life interest in the income (Rev. & Tax. Code, § 13644), and where the transfer was made by means of a revocable trust (Rev. & Tax. Code, § 13646).
Section 13641 was amended in 1959, after John’s death, to provide as follows: ‘ ‘ If a transfer specified in this article is made during lifetime by a resident . . . for a consideration in money or money’s worth, but the transfer is not a bona fide sale for an adequate and full consideration in money or money’s worth, the amount of the transfer subject to this part shall be the excess of (a) The value, at the date of the transferor’s death, of the property transferred, over (b) An amount equal to the same proportion of the value, at the time of the transferor’s death, of the property transferred which the consideration received in money or money’s worth for the property transferred bears to the value, at the date of transfer, of the property transferred. ’ ’
Tranquilla received only a fraction of the community property in the original agreement, as shown by our opinion in Vai v. Bank of America (1961) supra, 56 Cal.2d 329.