[306]*306Justice Stevens
delivered the opinion of the Court.
A trust beneficiary’s refusal to accept ownership of property may constitute an indirect gift to a successor in interest subject to federal gift tax liability. 26 U. S. C. §§2501, 2511. Under Treasury Regulation §25.2511-l(c), however, such a refusal is not subject to tax if it is effective under local law and made “within a reasonable time after knowledge of the existence of the transfer.” The petitioner husband (hereafter petitioner) in this case executed disclaimers of a contingent interest in a testamentary trust 33 years after that interest was created, but while it was still contingent. The narrow question presented is whether the “transfer” referred to in the Regulation occurs when the interest is created, as the Government contends, or at a later time when the interest either vests or becomes possessory, as argued by petitioner.
Petitioner’s grandmother, Margaret Weyerhaeuser Jew-ett, died in 1939 leaving the bulk of her substantial estate in a testamentary trust. Her will, executed in Massachusetts, provided that the trust income should be paid to petitioner’s grandfather during his life, and thereafter to petitioner’s parents. Upon the death of the surviving parent, the principal was to be divided “into equal shares or trusts so that there shall be one share for each child of my said son [petitioner’s father] then living and one share for the issue then living representing each child of my said son then dead.” App. 9. Petitioner’s mother is the sole surviving life tenant. Thus, under the testamentary plan, if petitioner survived his mother, he would receive one share of the corpus of the trust; if he predeceased his mother, that share would be distributed to his issue. Since petitioner’s parents had two children, his share of the trust amounted to one-half of the principal.
In 1972, when petitioner was 45 years old, he executed two disclaimers. The disclaimers each recognized that petitioner had “an interest in fifty percent (50%) of the trust estate . . . provided that he survives” his mother. Id., at 15. In the [307]*307first disclaimer, petitioner renounced his right to receive 95% “of the aforesaid fifty percent (50%) of the remainder of the trust estate,” ibid.; in the second he renounced his right to the remaining 5%. In 1972 the value of the trust exceeded $8 million.
Petitioner and his wife filed gift tax returns for the third and fourth quarters of 1972 in which they advised the Commissioner of the disclaimers, but did not treat them as taxable gifts.1 The Commissioner assessed a deficiency of approximately $750,000. He concluded that the disclaimers were indirect transfers of property by gift within the meaning of §§ 2501(a)(1)2 and 2511(a)3 of the Internal Revenue Code, and that they were not excepted from tax under Treas. Reg. §25.2511-l(c)4 because they were not made “within a [308]*308reasonable time after knowledge” of his grandmother’s transfer to him of an interest in the trust estate. Petitioner then filed this action in the Tax Court seeking a redetermination of the deficiency.
In the Tax Court and in the Court of Appeals, petitioner argued that at the time the disclaimers were made he had nothing more than a contingent interest in the trust, and that the “reasonable time” in which a tax-free disclaimer could be made did not begin to run until the interest became vested and possessory upon the death of the last surviving life tenant.5 Although a comparable argument had been accepted [309]*309by the Court of Appeals for the Eighth Circuit in Keinath v. Commissioner, 480 F. 2d 57 (1973),6 it was rejected by the Tax Court7 and by the Ninth Circuit8 in this case. We granted certiorari to resolve the conflict. 452 U. S. 904.
Petitioner relies heavily on the plain language of the Treasury Regulation and on early decisions that influenced its draftsmen. Before analyzing that language and its history, it is appropriate to review the statutory provisions that the Regulation interprets.
I
Section 2501(a)(1) of the Internal Revenue Code imposes a tax “on the transfer of property by gift.” Section 2511(a) provides that the tax shall apply “whether the gift is direct or indirect, and whether the property is real or personal, tangible or intangible.” As the Senate9 and House10 Reports explain:
“The terms ‘property,’ ‘transfer,’ ‘gift,’ and ‘indirectly’ are used in the broadest and most comprehensive sense; the term ‘property’ reaching every species of right or interest protected by law and having an exchangeable value.”
In Smith v. Shaughnessy, 318 U. S. 176, 180, the Court noted that “[t]he language of the gift tax statute, ‘property [310]*310. . . real or personal, tangible or intangible,’ is broad enough to include property, however conceptual or contingent.”
Our expansive reading of the statutory language in Smith unquestionably encompasses an indirect transfer, effected by means of a disclaimer, of a contingent future interest in a trust.11 Congress enacted the gift tax as a “corollary” or “supplement” to the estate tax.12 In Estate of Sanford v. Commissioner, 308 U. S. 39, 44, the Court explained that “[a]n important, if not the main, purpose of the gift tax was to prevent or compensate for avoidance of death taxes by taxing the gifts of property inter vivos which, but for the gifts, would be subject in its original or converted form to the tax laid upon transfers at death.” Since the practical effect of petitioner’s disclaimers was to reduce the expected size of his taxable estate and to confer a gratuitous benefit upon the natural objects of his bounty, the treatment of the disclaimers as taxable gifts is fully consistent with the basic purpose of the statutory scheme.
II
The controlling Treasury Regulation provides that a refusal to accept ownership of property transferred from a decedent does not constitute a gift if two conditions are met. First, the refusal must be effective under the law governing the administration of the decedent’s estate. Second, the re[311]*311fusal must be made “within a reasonable time after knowledge of the existence of the transfer.”
There is no dispute in this case that the first requirement has been satisfied; the disclaimers were effective under Massachusetts law. The controversy arises from the second requirement; specifically, it is over the meaning of the word “transfer,” which may be read to refer to the creation of petitioner’s remainder interest by his grandmother’s will, or to either the vesting of that interest or the distribution of tangible assets upon the death of the life tenant. Both positions find support in the language of the Regulation.
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[306]*306Justice Stevens
delivered the opinion of the Court.
A trust beneficiary’s refusal to accept ownership of property may constitute an indirect gift to a successor in interest subject to federal gift tax liability. 26 U. S. C. §§2501, 2511. Under Treasury Regulation §25.2511-l(c), however, such a refusal is not subject to tax if it is effective under local law and made “within a reasonable time after knowledge of the existence of the transfer.” The petitioner husband (hereafter petitioner) in this case executed disclaimers of a contingent interest in a testamentary trust 33 years after that interest was created, but while it was still contingent. The narrow question presented is whether the “transfer” referred to in the Regulation occurs when the interest is created, as the Government contends, or at a later time when the interest either vests or becomes possessory, as argued by petitioner.
Petitioner’s grandmother, Margaret Weyerhaeuser Jew-ett, died in 1939 leaving the bulk of her substantial estate in a testamentary trust. Her will, executed in Massachusetts, provided that the trust income should be paid to petitioner’s grandfather during his life, and thereafter to petitioner’s parents. Upon the death of the surviving parent, the principal was to be divided “into equal shares or trusts so that there shall be one share for each child of my said son [petitioner’s father] then living and one share for the issue then living representing each child of my said son then dead.” App. 9. Petitioner’s mother is the sole surviving life tenant. Thus, under the testamentary plan, if petitioner survived his mother, he would receive one share of the corpus of the trust; if he predeceased his mother, that share would be distributed to his issue. Since petitioner’s parents had two children, his share of the trust amounted to one-half of the principal.
In 1972, when petitioner was 45 years old, he executed two disclaimers. The disclaimers each recognized that petitioner had “an interest in fifty percent (50%) of the trust estate . . . provided that he survives” his mother. Id., at 15. In the [307]*307first disclaimer, petitioner renounced his right to receive 95% “of the aforesaid fifty percent (50%) of the remainder of the trust estate,” ibid.; in the second he renounced his right to the remaining 5%. In 1972 the value of the trust exceeded $8 million.
Petitioner and his wife filed gift tax returns for the third and fourth quarters of 1972 in which they advised the Commissioner of the disclaimers, but did not treat them as taxable gifts.1 The Commissioner assessed a deficiency of approximately $750,000. He concluded that the disclaimers were indirect transfers of property by gift within the meaning of §§ 2501(a)(1)2 and 2511(a)3 of the Internal Revenue Code, and that they were not excepted from tax under Treas. Reg. §25.2511-l(c)4 because they were not made “within a [308]*308reasonable time after knowledge” of his grandmother’s transfer to him of an interest in the trust estate. Petitioner then filed this action in the Tax Court seeking a redetermination of the deficiency.
In the Tax Court and in the Court of Appeals, petitioner argued that at the time the disclaimers were made he had nothing more than a contingent interest in the trust, and that the “reasonable time” in which a tax-free disclaimer could be made did not begin to run until the interest became vested and possessory upon the death of the last surviving life tenant.5 Although a comparable argument had been accepted [309]*309by the Court of Appeals for the Eighth Circuit in Keinath v. Commissioner, 480 F. 2d 57 (1973),6 it was rejected by the Tax Court7 and by the Ninth Circuit8 in this case. We granted certiorari to resolve the conflict. 452 U. S. 904.
Petitioner relies heavily on the plain language of the Treasury Regulation and on early decisions that influenced its draftsmen. Before analyzing that language and its history, it is appropriate to review the statutory provisions that the Regulation interprets.
I
Section 2501(a)(1) of the Internal Revenue Code imposes a tax “on the transfer of property by gift.” Section 2511(a) provides that the tax shall apply “whether the gift is direct or indirect, and whether the property is real or personal, tangible or intangible.” As the Senate9 and House10 Reports explain:
“The terms ‘property,’ ‘transfer,’ ‘gift,’ and ‘indirectly’ are used in the broadest and most comprehensive sense; the term ‘property’ reaching every species of right or interest protected by law and having an exchangeable value.”
In Smith v. Shaughnessy, 318 U. S. 176, 180, the Court noted that “[t]he language of the gift tax statute, ‘property [310]*310. . . real or personal, tangible or intangible,’ is broad enough to include property, however conceptual or contingent.”
Our expansive reading of the statutory language in Smith unquestionably encompasses an indirect transfer, effected by means of a disclaimer, of a contingent future interest in a trust.11 Congress enacted the gift tax as a “corollary” or “supplement” to the estate tax.12 In Estate of Sanford v. Commissioner, 308 U. S. 39, 44, the Court explained that “[a]n important, if not the main, purpose of the gift tax was to prevent or compensate for avoidance of death taxes by taxing the gifts of property inter vivos which, but for the gifts, would be subject in its original or converted form to the tax laid upon transfers at death.” Since the practical effect of petitioner’s disclaimers was to reduce the expected size of his taxable estate and to confer a gratuitous benefit upon the natural objects of his bounty, the treatment of the disclaimers as taxable gifts is fully consistent with the basic purpose of the statutory scheme.
II
The controlling Treasury Regulation provides that a refusal to accept ownership of property transferred from a decedent does not constitute a gift if two conditions are met. First, the refusal must be effective under the law governing the administration of the decedent’s estate. Second, the re[311]*311fusal must be made “within a reasonable time after knowledge of the existence of the transfer.”
There is no dispute in this case that the first requirement has been satisfied; the disclaimers were effective under Massachusetts law. The controversy arises from the second requirement; specifically, it is over the meaning of the word “transfer,” which may be read to refer to the creation of petitioner’s remainder interest by his grandmother’s will, or to either the vesting of that interest or the distribution of tangible assets upon the death of the life tenant. Both positions find support in the language of the Regulation.
To a layman the word “transfer” would normally describe a change in ownership of an existing interest rather than the creation of a new interest. Moreover, the reference to a transfer of “ownership of a decedent’s property” suggests that the transferee must acquire property that once had been owned by the decedent; petitioner’s grandmother never owned the future interests that her will created, but she once did own the assets (or their equivalent) that the remainder-men will acquire when their interests become possessory in character. Thus, language in the Regulation implies that the relevant “transfer” had not yet occurred when petitioner renounced his interest in the trust.
Other language, however, indicates that the relevant “transfer” occurs at the time of the testator’s death. The word “transfer” is the basic term used in the gift tax provisions to describe any passage of property without consideration that may have tax consequences. See 26 U. S. C. §§2501, 2511, quoted in nn. 2, 3, supra.13 The Regulation [312]*312describes a transfer that “is effected by the decedent’s will” (or by the law of descent and distribution of intestate property), not by a subsequent vesting event or distribution of property. The property must be transferred “from a decedent,” not from an estate executor or trust administrator. The lack of any reference in the Regulation to future interests or contingent remainders, and the consistent focus on transfers effected by the decedent by will or through the laws of intestate distribution, undermine the suggestion that the relevant transfer occurs other than at the time of the testator’s death. The Regulation also requires “knowledge of the existence of the transfer”; since a person to whom assets have actually been distributed would seldom, if ever, lack knowledge of the existence of such a transfer, it seems more likely that this provision was drafted to protect persons who had no knowledge of the creation of an interest.
On balance, we believe that the text of the Regulation supports the Commissioner’s interpretation. Because that text is not entirely clear, however, it is appropriate to examine briefly the Regulation’s history.
Ill
Treasury Regulation §25.2511-l(c) has not been changed since it was promulgated on November 15, 1958. The form of the Regulation, however, is somewhat different from a draft that was first proposed on January 3, 1957. That draft required a renunciation to be made “within a reasonable time after knowledge of the existence of the interest,” rather than [313]*313after knowledge of the existence of the “transfer.”14 The word “interest” unquestionably would encompass a contingent remainder even if the word “transfer” arguably would not. Thus, if the initial draft had been adopted without change, petitioner’s disclaimers certainly would be subject to tax. Petitioner contends that the drafting change must have been intended to avoid this consequence.
An assessment of petitioner’s argument requires an examination of the reason for the change in the Regulation’s language. The explanation of the change rendered by the Commissioner in 1958 indicates that it was intended to accomplish a purpose quite different from that suggested by petitioner.
A Memorandum from the Commissioner to the Secretary of the Treasury submitted on October 1,1958, explained that the change in language was intended to capture “the proper distinction” between two early court decisions that the Regulation had attempted to codify.15 In both of these cases the [314]*314transferee had renounced a fee interest before the administration of the decedent’s estate had been completed. In the earlier case, Brown v. Routzahn, 63 F. 2d 914 (CA6 1933), cert. denied, 290 U. S. 641, a husband refused to accept a bequest under his wife’s will. Under Ohio law the disclaimer was effective because it preceded the distribution of his wife’s estate. Since the husband had never acquired ownership of the property, his disclaimer was held not to constitute the transfer of an interest; rather, it was deemed an exercise of a right to refuse a gift of property. Accordingly, the renunciation was held not be a gift in contemplation of death for purposes of determining the husband’s estate tax. In the second case, Hardenbergh v. Commissioner, 198 F. 2d 63 (CA8 1952), cert. denied, 344 U. S. 836, the decedent died intestate leaving a wife, a daughter, and a son by a prior marriage. To effectuate the decedent’s intent to equalize the wealth of the three, the wife and daughter relinquished their rights to their intestate shares. Under Minnesota law, however, “title to an interest in decedent’s estate vested in the taxpayers by operation of law which neither had the power to prevent.” 198 F. 2d, at 66. Since local law denied them the power to renounce the interest, the taxpayers’ disclaimers were not effective and constituted gifts subject to the federal gift tax.
As indicated in the Commissioner’s Memorandum, Treas. Reg. §25.2511-l(c) sought to preserve the distinction between these two cases. Originally, the Regulation tracked language in the Hardenbergh opinion and provided that a disclaimer was taxable only if title to the property had “vested” under state law. On consideration, however, the Commissioner recognized that this language did not capture “the [315]*315proper distinction between these two court cases”; indeed, in Brown v. Routzahn, the property interest had fully “vested” at the time of the taxpayer’s renunciation.16 Thus, to incorporate the proper distinction, the Commissioner changed the “vesting” requirement to a requirement that “the law governing the administration of the decedent’s estate” must give a right to “refuse to accept ownership of property transferred from a decedent.” Having eliminated the “vested property interest” language from the first part of the Regulation, the Commissioner correspondingly changed the second part to read “within a reasonable time after knowledge of the existence of the transfer,” rather than “within a reasonable time after knowledge of the existence of the interest.”
Thus, the purpose of the change in the Regulation was not to exclude contingent remainders. Neither Brown nor Hardenbergh concerned contingent interests. Since the original draft of the Regulation supports the Commissioner’s position in this case, and since the change in its form was made for a reason that is unrelated to the issue presented, the Regulation’s history buttresses the Commissioner’s position.
Petitioner also contends that the history of the Regulation demonstrates that its draftsmen merely intended to codify the rules of Brown v. Routzahn and Hardenbergh v. Commissioner, and that under those cases state law controlled both the “right” to renounce and the “timeliness” of the renunciation. Although petitioner accurately interprets [316]*316these two eases, his interpretation of the Regulation would render half of it superfluous. The Regulation explicitly imposes two requirements: (1) the disclaimer must be effective as a matter of local law; and (2) the disclaimer must be made within a reasonable time. If timeliness were governed solely by local law, the second requirement would be redundant. ’WTiile it is possible that local law may require a disclaimer to be timely to be effective, such a requirement would not absolve the taxpayer from the separate timeliness requirement imposed by the federal Regulation. Otherwise, the Regulation would be complete with a single requirement that the disclaimer be effective under local law.17
> h-4
Petitioner s remaining arguments may be answered quickly. In the Tax Reform Act of 1976, Congress established specific standards for determining whether a disclaimer constitutes a taxable gift; those new standards would support the Commissioner’s position in this case if the original transfers had occurred after the effective date of the Act.18 Petitioner argues that the legislative decision not to [317]*317apply those standards retroactively is evidence that a different rule was previously effective. It is clear, however, that Congress expressed no opinion on the proper interpretation of the Regulation at issue in this case; it merely established an unambiguous rule that should apply in the future.19
Petitioner also argues that it is unfair to apply the 1958 Regulation “retroactively” to an interest that had been created previously; petitioner asserts that, by the time the Regulation was adopted, it was already too late — according to the Commissioner’s view — to disclaim the interest.20 The argument lacks merit. It is based on an assumption that petitioner had a “right” to renounce the interest without tax consequences that was “taken away” by the 1958 Regulation. Petitioner never had such a right. Indeed, petitioner does not argue that taxation of the disclaimers is inconsistent with the statutory provisions imposing a gift tax, which were enacted long before petitioner’s interest in the trust was created. The 1958 Regulation was adopted well in advance of the disclaimers in this case; we see no “retroactivity” problem.
Finally, petitioner argues that the disclaimer of a contingent remainder is not a taxable event by analogizing it to an [318]*318exercise of a special power of appointment, which generally is not considered a taxable transfer. 26 U. S. C. §2514. As the Commissioner notes in response, however, a disclaim-ant’s control over property more closely resembles a general power of appointment, the exercise of which is a taxable transfer. Ibid. Unlike the holder of a special power — but like the holder of a general power — a disclaimant may decide to retain the interest himself. It is this characteristic of the control exercised by a disclaimant that makes a disclaimer a “transfer” within the scope of the gift tax provisions.
V
The Commissioner’s interpretation of the Regulation has been consistent over the years and is entitled to respect. This canon of construction, which generally applies to the Commissioner’s interpretation of the Internal Revenue Code, see Commissioner v. Portland Cement Co. of Utah, 450 U. S. 156, 169, is even more forceful when applied to the Commissioner’s interpretation of his own Regulation.
Since the relevant “transfer” in this case occurred when petitioner’s grandmother irrevocably transferred her assets to a testamentary trust, petitioner’s disclaimers of the rights created by that trust were not made within a reasonable time. Even accepting petitioner’s argument that the clock did not begin to run until he reached the age of majority, the disclaimers were made after the passage of 24 years. As the Tax Court explained:
“The petitioner possessed, for 24 years, the effective right to determine who should ultimately receive the benefits of a 50-percent remainder interest of a trust which, in 1972, had a corpus of approximately $8 million. He waited to act in respect of that remainder interest until the surviving life beneficiary was over 70 years of age and until he himself was 45 and, it appears, a man of [319]*319substantial means. In 1972, by the execution of two disclaimers, he elected to let the property pass according to the alternative provisions of his grandmother’s will — to the natural objects of his bounty. This, we hold, was an exercise of control over the disposition of property subject to the gift tax imposed by section 2501.” 70 T. C. 430, 438 (1978) (footnote omitted).
We agree. The Commissioner’s assessment of a tax was proper, both under the statute and the Regulation.
The judgment of the Court of Appeals is affirmed.
It is so ordered.