MR. JUSTICE HARLAN delivered the opinion of the Court.This case, presenting a difficult question of bankruptcy law on which the circuits have differed, arises out of the following facts.  On September 27, 1961, voluntary bankruptcy petitions were filed in a federal court in Texas by Gerald Segal, Sam Segal, and their business partnership, Segal Cotton Products.  A single trustee, Rochelle, was designated to serve in all three proceedings.  After the close of that calendar year, loss carryback tax refunds were sought and obtained from the United States on behalf of Gerald and Sam Segal under Internal Revenue Code § 172.  The losses underlying the refunds had been suffered by the partnership during 1961 prior to the filing of the bankruptcy petitions; the losses were carried back to the years 1959 and 1960 to offset net income on which the Segals had both paid taxes.  By agreement, Rochelle deposited the refunds in a special account, and the Segals applied to the referee in bankruptcy to award the refunds to them on the ground that bankruptcy had not passed the refund claims to the trustee. Page 382 U. S. 377Concluding that the refund claims had indeed passed under § 70a(5) of the Bankruptcy Act [Footnote 1] as "property . . . which prior to the filing of the petition . . . [the bankrupt] could by any means have transferred," the referee denied the Segals' application.  The District Court affirmed the denial, and the Segals and their partnership appealed to the Court of Appeals for the Fifth Circuit. [Footnote 2]  That court too rejected the Segals' contention.As the Court of Appeals here recognized, the Court of Appeals for the First Circuit, in Fournier v. Rosenblum, 318 F.2d 525, and the Court of Appeals for the Third Circuit in In re Sussman, 289 F.2d 76, have both ruled squarely that a bankrupt's loss carryback refund claims based on losses in the year of bankruptcy do not pass to the trustee, but, instead, the bankrupt is entitled to the refunds when they are ultimately paid.  Concededly, under § 70a(5), the trustee must acquire the bankrupt's "property" as of the date the petition is filed, and property subsequently acquired belongs to the bankrupt.  See note 1 supra; 4 Collier, Bankruptcy 70.09 (14th ed. 1962).  Since the tax laws allow a loss carryback refund claim to be made only when the year Page 382 U. S. 378 has closed, see I.R.C. §§ 172(a), (c), 6411, both the First and Third Circuits reasoned that, prior to the year's end, a loss carryback refund claim was too tenuous to be classed as "property" which would pass under § 70a(5).  Alternatively, the Third Circuit stated that, because of the federal anti-assignment statute, [Footnote 3] inchoate refund claims were not in any event property "which prior to the filing of the petition . . . [the bankrupt] could by any means have transferred," as § 70a(5) also requires.  Both circuits felt the result to be unfortunate, not least because the very losses generating the refunds often help precipitate the bankruptcy and injury to the creditors, but both believed the statutory language left no option.After detailed discussion of the problems, the Court of Appeals in this case resolved that the loss carryback refund claims were both "property" and "transferable" at the time of the bankruptcy petition, and hence had passed to the trustee.  336 F.2d 298.  We granted certiorari because of the conflict and the significance of the issue in bankruptcy administration. [Footnote 4]  380 U. S. 931.  Page 382 U. S. 379 Conceding the question to be close, we are persuaded by the reasoning of the Fifth Circuit, and we affirm its decision.IWe turn first to the question whether, on the date the bankruptcy petitions were filed, the potential claims for loss carryback refunds constituted "property" as § 70a(5) employs that term.  Admittedly, in interpreting this section,"[i]t is impossible to give any categorical definition to the word 'property,' nor can we attach to it in certain relations the limitations which would be attached to it in others."Fisher v. Cushman, 103 F. 860, 864, 51 L.R.A. 292.  Whether an item is classed as "property" by the Fifth Amendment's Just Compensation Clause or for purposes of a state taxing statute cannot decide hard cases under the Bankruptcy Act, whose own purposes must ultimately govern.The main thrust of § 70a(5) is to secure for creditors everything of value the bankrupt may possess in alienable or leviable form when he files his petition.  To this end, the term "property" has been construed most generously, and an interest is not outside its reach because it is novel or contingent or because enjoyment must be postponed.  E.g., Horton v. Moore, 110 F.2d 189 (contingent, postponed interest in a trust); Kleinschmidt v. Schroeter, 94 F.2d 707 (limited interest in future profits of a joint venture); see 3 Remington, Bankruptcy §§ 1177-1269 (Henderson ed. 1957).  However, limitations on the term do grow out of other purposes of the Act; one purpose which is highly prominent and is relevant in this case is to leave the bankrupt free after the date of his petition to accumulate new wealth in the future.  Accordingly, future wages of the bankrupt do not constitute "property" at the time of bankruptcy nor, analogously, does an intended bequest to him or a promised gift -- even though state law might permit all of these Page 382 U. S. 380 to be alienated in advance.  E.g., In re Coleman, 87 F.2d 753; see 4 Collier, Bankruptcy 70.09, 70.27 (14th ed. 1962).  Turning to the loss carryback refund claim in this case, we believe it is sufficiently rooted in the pre-bankruptcy past and so little entangled with the bankrupts' ability to make an unencumbered fresh start, that it should be regarded as "property" under § 70a(5).Temporally, two key elements pointing toward realization of a refund existed at the time these bankruptcy petitions were filed:  taxes had been paid on net income within the past three years, and the year of bankruptcy at that point exhibited a net operating loss.  The Segals stress in this Court that, under the statutory scheme, no refund could be claimed from the Government until the end of the year, but, as cases already cited indicate, postponed enjoyment does not disqualify an interest as "property."  That earnings by the bankrupt after filing the petition might diminish or eliminate the loss carryback refund claim does further qualify the interest, but we have already noted that contingency in the abstract is no bar, and the actual risk that the refund claims may be erased is quite far from a certainty. [Footnote 5]  Unlike a pre-bankruptcy promise of a gift or bequest, passing title to the trustee does not make it unlikely the gift or bequest will be effected.  Nor does passing the claim hinder the bankrupt from starting out on a clean slate, for any administrative inconvenience to the bankrupt will not be prolonged, see 110 U.Pa.L.Rev., at 279-280, and the bankrupt without a refund claim to preserve has more reason to earn income, rather than less. Page 382 U. S. 381We are told that, if this loss carryback refund claim is "property," that label must also attach to loss carryovers, that is, the application of pre-bankruptcy losses to earnings in future years.  Since losses may be carried forward five years and, in some cases, even seven or ten years, I.R.C. §§ 172(b)(1)(B)-(D), great hardship for the estate is foreseen by petitioners in keeping it open for this length of time.  While in fact the trustee can obviate this detriment to the estate -- by selling a contingent claim in some instances or simply forgoing it -- inconvenience and hindrance might be caused for the bankrupt individual.  Without ruling in any way on a question not before us, it is enough to say that a carryover into post-bankruptcy years can be distinguished conceptually, as well as practically.  The bankrupts in this case had both prior net income and a net loss when their petitions were filed, and apparently would have deserved an immediate refund had their tax year terminated on that date; by contrast, the supposed loss carryover would still need to be matched in some future year by earnings, earnings that might never eventuate at all.IIHaving concluded that the loss carryback refund claims in this case constituted "property" at the time of the bankruptcy petitions, it remains for us to decide whether in addition they were property "which prior to the filing of the petition . . . [the bankrupt] could by any means have transferred. . . ." [Footnote 6]  The prime obstacle Page 382 U. S. 382 to an affirmative answer is 31 U.S.C. § 203, which renders "absolutely null and void" all transfers of any claim against the United States unless among other conditions the claim has been allowed and the amount ascertained.  See n 3, supra.  Plainly, since the tax laws calculate the refund only on the full year's experience after the year has closed, the claims in the present instance could not have been allowed or ascertained at the time the petitions were filed.The respondent argues that the transferability requirement of § 70a(5) can be met by relying on the long established rule that § 203 does not apply to prevent transfers by "operation of law."  See United States v. Aetna Cas. & Surety Co., 338 U. S. 366,  338 U. S. 373-374; Goodman v. Niblack, 102 U. S. 556,  102 U. S. 560. [Footnote 7]  The phrasing of § 70a(5), however, suggests that it contemplates a voluntary transfer and is not satisfied simply because property could have been transferred by operation of law, such as by death, bankruptcy, or judicial process.  Not only is there practically no form of property that would not be transferable under the broader reading, but such a reading also makes redundant the alternative route for complying with § 70a(5) through showing that the property "might have been levied upon and sold under judicial process. . . ." [Footnote 8]  Admittedly, the Bankruptcy Act defines the word "transfer" in its general definitional section to include at least certain transfers that are "involuntary," [Footnote 9] Page 382 U. S. 383 but legislative history indicates that the introduction of this latter term into the Act 40 years after its framing was not aimed at § 70a(5) at all.  See H.R.Rep. No. 1409, 75th Cong., 1st Sess., p. 5; Analysis of H.R. 12889, 74th Cong., 2d Sess., p. 7 House Judiciary (Comm. Print).Difficulty in defining the term "transfer" is enhanced by the absence of any explanation for Congress' having made transferability a condition in the first place.  Bankruptcy Acts prior to the present one enacted in 1898 had no like limitation on the trustee's succession to property, see Bankruptcy Acts of 1867, § 14, 14 Stat. 522; of 1841, § 3, 5 Stat. 442; and of 1800, §§ 5, 13, 2 Stat. 23, 25, and under the predecessor Act claims against the Government passed without impediment to the trustee.  See, e.g., Erwin v. United States, 97 U. S. 392.  This history and the chance that the 1898 limitation sought only to respect state policies against alienating property such as a contingent remainder or spendthrift trust fund argue for flatly ignoring the limitation in this instance.  See 14 Stan.L.Rev. at 383-386.  Nevertheless, we have been shown no legislative history on the point, and an uncertain guess at Congress' intent provides dubious ground for disregarding its plain language.  In any event, we are not prepared to accept this argument, just as we cannot now go beyond a narrow definition of the term "transfer," in a case in which these points have not been thoroughly briefed by the parties. Page 382 U. S. 384The Court of Appeals determined that, despite § 203, a sufficient voluntary transfer of the loss carryback refund claim could have been made prior to bankruptcy to satisfy § 70a(5), and, on balance, we share this view.  In Martin v. National Surety Co., 300 U. S. 588,  300 U. S. 596, a unanimous Court held that § 203, in spite of its broad language, "must be interpreted in the light of its purpose to give protection to the Government," so that, between the parties, effect might still be given to an assignment that failed to comply with the statute.  The opinion reasoned that, after claims have been collected by the assignor, requiring compliance with the invalid assignment by transfer of the recovery to the assignee presented no danger that the Government might become "embroiled in conflicting claims, with delay and embarrassment and the chance of multiple liability."  300 U.S. at  300 U. S. 594.  While other circumstances encouraged Martin to uphold the assignment, and this Court has not faced the problem head-on since that time, we find no reason to retreat now from the basic holding in Martin, which was both anticipated and followed by a number of other courts, state and federal.  See California Bank v. United States Fid. & Guar. Co., 129 F.2d 751; Royal Indem. Co. v. United States, 93 F. Supp. 891, 117 Ct.Cl. 736; Leonard v. Whaley, 91 Hun 304, 36 N.Y.S. 147.  Among these States is Texas, whose precedents leave little doubt that an assignment of the claims at issue would be enforced in equity in the normal case.  Trinity Univ. Ins. Co. v. First State Bank, 143 Tex. 164, 183 S.W.2d 422; see United Hay Co. v. Ford, 124 Tex. 213, 76 S.W.2d 480 (dictum).It should not be pretended that this contemplated "transfer" is one in the fullest sense that term permits.  For example, this Court has ruled that one holding a claim invalidly assigned under § 203 may not sue the Government upon it though he join his assignor as well.  Page 382 U. S. 385 United States v. Shannon, 342 U. S. 288.  Yet it remains true that a Texas court of equity could and would compel the assignment of any refund received, if indeed it might not try to compel a reluctant assignor to collect the claim or make it over by a valid assignment when that became possible.  This, we believe, suffices to make the Segals' claims transferable within the meaning of § 70a(5).  Cf. 4 Collier, Bankruptcy � 70.37, at 1293, n. 6 (14th ed. 1962).Affirmed
U.S. Supreme CourtSegal v. Rochelle, 382 U.S. 375 (1966)Segal v. RochelleNo. 44Argued November 17, 1965Decided January 18, 1966382 U.S. 375SyllabusOn September 27, 1961, the individual petitioners and their business partnership filed bankruptcy petitions.  After the end of that year, loss carryback federal income tax refunds were obtained for the individual petitioners based on the firm's losses during 1961 prior to bankruptcy which were offset against income for 1959 and 1960 on which taxes had been paid.  These refunds, on deposit in a special account by the bankruptcy trustee, are claimed by petitioners on the ground that bankruptcy had not passed the refund claims to the trustee.  The referee ruled against petitioners, as did the District Court and the Court of Appeals, the latter holding that the loss carryback refund claims were both "property" and "transferable" at the time of the bankruptcy petition, and thus had passed to the trustee.Held:1. These inchoate claims for loss carryback refunds constituted "property" as that term is used in § 70a(5) of the Bankruptcy Act.  Pp.  382 U. S. 379-381.(a) The classification as "property" is governed by the purposes of the Act.  P.  382 U. S. 379.(b) The main thrust of § 70a(5) being to obtain for creditors everything of value possessed by the bankrupt in alienable form at the time the petition was filed, the term "property" has been generously construed, and does not exclude interests which are novel or contingent or where enjoyment must be postponed.  P.  382 U. S. 379.(c) The term is limited by another purpose of the Act, which is to leave the bankrupt free after the date of the petition to acquire new wealth.  P.  382 U. S. 379.(d) The loss carryback refund claim is sufficiently rooted in the pre-bankruptcy past and so little enmeshed with the bankrupt's ability to make an unencumbered new start that it should be regarded as "property" under § 70a(5).  P.  382 U. S. 380.2. The refund claims were property which, prior to filing the petition, could have been "transferred" within the meaning of § 70a(5).  Pp.  382 U. S. 381-385. Page 382 U. S. 376(a) The Assignment of Claims Act, 31 U.S. C. § 203, does not always prevent giving effect, between the parties, to a noncomplying transfer, Martln v. National Surety Co., 300 U. S. 588.  P.  382 U. S. 384.(b) In Texas, where the petitioners resided and did business, the precedents leave little doubt that an assignment of the refund claims would normally be enforced in equity between the parties.  Pp.  382 U. S. 384-385.336 F.2d 298, affirmed.