Section 13208 of the Omnibus Budget Reconciliation Act of 1993 (“Section 13208” of “OBRA 1993”), Pub.L. No. 103-66, 107 Stat. 312, 469 (1993), set the maximum federal estate and gift tax rates at 53 % and 55 %. Section 13208 was enacted on August 10, 1993, and provided that these rates apply to the estates of decedents dying and gifts made after December 31, 1992. See id. This case presents the question of whether the application of these tax rates during the eight-month period prior to the statute’s enactment violates the Due Process Clause or Takings Clause of the Fifth Amendment of the United States Constitution, or the Constitution’s prohibition on direct taxation without apportionment. See U.S. Const, art I, § 2, cl. 3 & § 9, cl. 4. The district court held that the retroactive application of these tax rates was constitutional; accordingly, it granted the government’s motion to dismiss this tax refund suit. We have jurisdiction under 28 U.S.C. § 1291 and we'affirm.
I.
For nine years prior to January 1, 1993, the maximum federal estate and gift tax rates were 53 % and 55
%. See National Taxpayers Union, Inc. v. United States,
68
*964
F.3d 1428, 1430 n. 1 (D.C.Cir.1995). These rates were originally “enacted to be in effect only for calendar year 1984, after which the top rate was to drop to 50
Id.
at 1430 n. 1 (citing Economic Recovery Act of 1981, Pub.L. No. 97-34, § 402(a), (b), 95 Stat. 172, 300 (1981)). In 1984, however, Congress extended the 53
%
and 55 % tax rates through 1987.
See
Deficit Reduction Act of 1984, Pub.L. No. 98-369, § 21, 98 Stat. 494, 506 (1984). In 1987, Congress again extended these rates through January 1, 1993.
See
Omnibus Budget Reconciliation Act of 1987, Pub.L. No. 100-203, § 10401, 101 Stat. 1330-430 (1987);
National Taxpayers,
In February 1993, shortly after taking office, President Clinton proposed restoring the 53 % and 55 % tax rates, effective January 1, 1993. See id. On August 10, 1993, President Clinton signed OBRA 1993, which included this proposal. Specifically, Section 13208 of OBRA 1993 increased the highest federal estate and gift tax rates to 53 % for transfers over $ 2.5 million but less than $ 3 million, and 55 % for transfers over $ 3 million, retroactively effective January 1, 1993. See 26 U.S.C. § 2001(e)(1) (West Supp.1998).
The Report of the House Budget Committee provided the following reasons for enacting Section 13208; “To raise revenue to address the Federal deficit, to improve tax equity, and to make the tax system more progressive, the committee believes that the top two estate and gift tax rates which expired at the end of 1992 should be reinstated.” H.R.Rep. No. 103-111, at 644 (1993), reprinted in 1993 U.S.C.C.A.N. 378, 875. The House Conference Report made no allusion to the provision’s retroactive application and provided no commentary justifying it. See H.R. Conf. Rep. No. 103-213, at 581 (1993), reprinted in 1993 U.S.C.C.A.N. 1088, 1270.
The Third Circuit has upheld Section 13208’s retroactive application from due process and Takings Clause challenges.
See Kane v. United States,
The tax liabilities of both the Estate of Angele C. Quarty and Elizabeth B. Cherne (“Taxpayers”) were increased as a result of the retroactive application of Section 13208’s increase in estate and gift tax rates. Mrs. Quarty died on January 12,1993; her taxable estate was greater than $3 million. At the time of her death, the maximum federal estate tax rate imposed on such estates was 50 %. As a result of Section 13208’s retroactive application, Mrs. Quarty’s estate was assessed $228,682.98 more in estate taxes than it would have been under a 50 % tax rate. Similarly, as a result Section 13208’s retroac-tivity, Mrs. Cherne was required to pay $110,000 more in gift taxes on gifts she made on January 8,1993 than she would have paid if the 1992 tax rates had not been reinstated.
Taxpayers filed individual claims for refunds with the Internal Revenue Service (“IRS”) to recover the additional taxes that they were required to pay as a result of the retroactive tax rate increases provided by Section 13208. In their respective refund claims, Taxpayers asserted that Section 13208’s retroactivity was unconstitutional on the grounds that it violated the Fifth Amendment’s Due Process and Takings Clauses, and constituted a direct tax without apportionment. 1
After their refund claims were denied, Taxpayers filed separate complaints in district court. In their complaints, Taxpayers *965 asserted the three constitutional challenges specified in their refund claims, plus a claim that Section 13208 violated the ex post facto prohibition in Article I, § 9, el. 3. After the district court consolidated these cases, the government filed a motion to dismiss the complaints for failure to state a claim pursuant to Rule 12(b)(6) of the Federal Rules of Civil Procedure, and Taxpayers filed a joint motion for summary judgment pursuant to Rule 56 of the Federal Rules of Civil Procedure. The district court granted the government’s motion to dismiss, and denied Taxpayers’ motion for summary judgment. The district court held that Taxpayers’ four constitutional challenges raised in their complaints failed to state a claim. The district court did not address whether Taxpayers’ failure to include the ex post facto claim in their refund claim filed with the IRS deprived it of jurisdiction over that claim. This appeal ensued.
II.
Whether the district court properly granted the government’s motion to dismiss Taxpayers’ constitutional challenges to Section 13208 presents a question of law that we review de novo.
See Licari v. Commissioner,
III.
A
The Supreme Court “repeatedly has upheld retroactive tax legislation against a due process challenge.”
United States v. Carlton,
In
Carlton,
the Supreme Court left no doubt as to the deferential due process standard applicable to challenges to retroactive tax legislation. “The due process standard to be applied to tax statutes with retroactive effect ... is the same as that generally applicable to retroactive economic legislation.”
Carlton,
Provided that the retroactive application of a statute is supported by a legitimate legislative purpose furthered by rational means, judgments about the wisdom of such legislation remain within the exclusive province of the legislative and executive branches....
To be sure, ... retroactive legislation does have to meet a burden not faced by legislation that has only future effects.... “The retroactive aspects of legislation, as well as the prospective aspects, must meet the test of due process, and the justifications for the latter may not suffice for the former”- But that burden is met simply by showing that the retroactive application of the legislation is itself justified by a rational legislative purpose.
*966
Id.
at 30-31,
In
Carlton,
the Court applied this familiar standard to a statute that amended, and limited the availability of, an estate tax deduction that Congress had enacted fourteen months earlier; the amendment was made effective as of the original enactment date of the deduction.
See id.
at 29,
Relying on § 2057 as enacted, executor Carlton used estate funds to purchase stock in MCI Communications Corporation, sold that stock two days later at a loss to the MCI ESOP, and claimed a deduction for half of the proceeds from the sale.
See id.
at 28,
In rejecting executor Carlton’s suggestion that the 1987 amendment’s retroactive application violated due process, the Court primarily relied on two considerations. First, the Court concluded that Congress’s purpose in enacting the 1987 amendment was neither illegitimate nor arbitrary, noting that Congress acted “to correct what it reasonably viewed as a mistake in the original 1986 provision that would have created a significant and unanticipated revenue loss.”
Id.
at 32,
Before we consider whether the retroactive application of the tax rates in Section 12308 is rationally related to a legitimate legislative purpose, we first address Taxpayers’ argument that this standard stated in
Carlton
does not govern the question of whether Section 13208’s retroactivity comports with due process because its tax rate change is tantamount to the enactment of a “wholly new tax.” This argument is an attempt to gain succor from whatever vitality remains in
Blodgett v. Holden,
Those cases were decided during an era characterized by exacting review of economic legislation under an approach that ‘has long since been discarded.’ Ferguson v. Skrupa,372 U.S. 726 , 730,83 S.Ct. 1028 ,10 L.Ed.2d 93 (1963). To the extent that their authority survives, they do not control here. Blodgett and Untermyer, which involved the Nation’s first gift tax, essentially have been limited to situations involving ‘the creation of a wholly new tax,’ and their ‘authority is of limited value in *967 assessing the constitutionality of subsequent amendments that bring about certain changes in the operation of the tax laws.’ United States v. Hemme, 476 U.S. [558, 568,106 S.Ct. 2071 ,90 L.Ed.2d 588 (1986) ].
Carlton,
The government asserts that the legitimate purposes of the retroactive application of Section 13208’s tax rates are, as the House Report states, “[t]o raise revenue, to address the Federal deficit, to improve tax equity, and to make the system more progressive.” H.R.Rep. No. 103-111, at 644, reprinted in 1993 U.S.C.C.A.N. at 875. The government further suggests that the eight-month period of retroactivity, making the rates applicable to the entire calendar year, is less extensive than other retroactivity periods upheld by the courts, and rationally related to its stated purposes. We agree.
There can be no dispute that the purpose of raising government revenue is a legitimate legislative purpose.
See
U.S. Const. art. I, § 8 & amend. XVI;
Carlton,
Taxpayers and their amici attempt to resist the conclusion that Section 13208’s retroactive application is a rational means to legitimate purposes through two different arguments: first, that Section 13208’s retro-activity is not “curative” of a congressional “mistake” as the Supreme Court characterized the retroactive amendment in
Carlton,
*968
Taxpayers and amici are correct that the tax rates imposed retroactively by Section 13208 are not “curative” of a congressional “mistake” in the same way that the retroactive amendment upheld in
Carlton
was. The retroactive amendment upheld in
Carlton
prevented the deduction that Congress enacted to encourage employee ownership Of stock in their companies from being obtained by any executor using estate funds to purchase and resell such stock to the decedent’s employee stock ownership plan.
See id.
at 31-32,
Taxpayers’ and amici’s arguments based on Section 13208’s alleged consequences are also unavailing. They fear that upholding Section 13208 will mean that “no executor can ever finally determine the amount of tax for which the estate is liable,” (see Taxpayers’ Opening Br. at 37), and that no estate can ever be “fully administered and closed,” (id at 39), thereby undermining state policies favoring expeditious administration of decedents’ estates, (id. at 39). They also suggest that upholding Section 13208’s retroactive application is inconsistent with the rule of law.
Because Section 13208 imposes only an eight-month period of retroactivity, upholding it does not present the specter of making an estate (its executor and beneficiaries) forever subject to the possibility of additional tax liability. It fits squarely within the judicial deference to periods of retroactivity in tax legislation “confined to short and limited periods.”
Carlton,
B.
Taxpayers claim that the application of the tax rates set by Section 13208 to the eight-month period before its enactment consti *969 tutes a taking of property without just compensation under the Fifth Amendment’s Takings Clause. See U.S. Const, amend V (“[N]or shall private property be taken for public use, without just compensation.”).
It is well established that Congress’s general exercise of its taxing power does not violate the Fifth Amendment’s prohibition on takings without just compensation.
See Brushaber v. Union Pac. R.R. Co.,
The Supreme Court has “eschewed the development of any set formula for identifying a ‘taking1 forbidden by the Fifth Amendment, and [has] relied instead on ad hoc, factual inquiries into the circumstances of each particular case.”
Connolly,
Even under the reasoning of the takings analysis of the
Eastern Enterprises
plurality opinion, it is clear that Section 13208’s retroactivity does not effect a taking. First, as noted above, Section' 13208 imposes a short period of retroactivity and restores the previously existing tax rates. Thus, in terms of the impact on the instant Taxpayers, its retroactive application imposes neither “severe retroactive liability,” nor liability “substantially disproportionate with the parties’ experience.”
Id.
at 2149;
cf. id.
at 2151 (Coal Act effecting unconstitutional taking reached back 30 to 50 years in imposing liability based on activities in 1946 and 1965). Second, because the tax rates in Section 13208 are the same as those existing prior to January 1993, and in 1992 Congress had passed a bill to retain those rates, any disruption of their expectations does not provide a strong argument for finding a taking. Further, Taxpayers’ expectations in the rate of taxation have been given little weight: “Nobody has a vested right in the rate of taxation, which may be retroactively changed at the will of Congress at least for periods of less than twelve months.”
Darusmont,
C.
Taxpayers claim that Section 13208’s retroactive tax rate increases impose a direct tax upon property in violation of the constitutional requirement that direct taxes be apportioned on the basis of the population of the states.
See
U.S. Const, art. I, § 2, cl. 3 (“Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers ....”);
id.
art. I, § 9, cl. 4 (“No Capitation, or other direct, Tax shall be laid, unless in Proportion to the Census or Enumeration herein before directed to be taken.”). In contrast to an excise or indirect tax, “which is levied upon the use or transfer of property even though it might be measured by the property’s value,”
United States v. Wells Fargo Bank,
Taxpayers do not challenge the established law that the federal estate and gift taxes are indirect taxes, imposed upon the transfer of property.
See Wells Fargo Bank,
The Supreme Court rejected a similar argument in
Milliken,
The Court swiftly rejected the suggestion that application of the 1918 rates rendered the tax “invalid as an unapportioned direct tax.”
Id.
at 24,
Likewise, in
First Nat’l Bank in Dallas v. United States,
We share these views with regard to taxes collected pursuant to Section 13208. Section 13208 does not impose a new tax in the sense of taxing transfers of property not previously subject to tax, but merely increases the tax rate of an existing tax. It is the taxable transfer that occasions the federal estate and gift taxes, and the change in the tax rate applicable to those transfers, even when imposed retroactively, does not alter the fact that there would be no federal estate or gift tax imposed on the property but for the taxable transfer. The portion of taxes collected pursuant to the increased rates in Section 13208 are thus not taxes upon the property itself. 5
We are also not persuaded by Taxpayers’ attempts to distinguish the holdings of Mil-liken and First Nat’l. Taxpayers argue that they did not have the same notice of the prospect of retroactive application of the tax as the taxpayers did in Milliken and First Nat’l. But the extent of a taxpayer’s notice of a change in the tax law has no bearing on whether the tax levied is upon a transfer of property or upon the property itself. Morever, in assessing due process challenges to retroactive tax legislation, where notice considerations may have some constitutional relevance, the Supreme Court has affirmed the view that lack of notice is not dispositive:
In Welch v. Henry, the Court upheld the retroactive imposition of a tax despite the absence of advanced notice of the legislation. And in Milliken v. United States, the Court rejected a similar notice argument, declaring that a taxpayer ‘should be regarded as taking his chances of any increase in the tax burden which might result from carrying out the established policy of taxation.’
See Carlton,
D.
Taxpayers and their amici contend that Section 13208’s retroactive application violates the prohibition on Congress enacting ex post facto laws. See U.S. Const, art. I, § 9, cl. 3 (“No Bill of Attainder or ex post facto Law shall be passed.”). The district court rejected this claim on the merits, but we do not reach the merits of this claim because it was not administratively exhausted.
*972
The United States, as a sovereign, "`is immune from suit, save as it consents to be sued ... and the terms of its consent to be sued in any court define that court's jurisdiction to entertain the suit.'" United States v. Dalm,
The Internal Revenue Code provides that no suit for a refund may be maintained in any court until a claim for a refund has been filed with the Secretary of the Treasury in accordance with Treasury Regulations:
No suit or proceeding shall be maintained in any court for the recovery of any internal revenue tax alleged to have been erroneously or illegally assessed or collected, or of any penalty claimed to have been collected without authority, or of any sum alleged to have been excessive or in any manner wrongfully collected, until a claim for refund or credit has been duly filed with the Secretary, according to the provisions of law in that regard, and the regulations of the Secretary established in pursuance thereof.
26 U.S.C. § 7422(a). The regulations promulgated under this statute require the taxpayer to specify each ground for which a refund is claimed:
No refund or credit will be allowed after the expiration of the statutory period of limitation applicable to the filing of a claim therefor except upon one or more of the grounds set forth in a claim filed before the expiration of such period. The claim must set forth in detail each ground upon which a credit or refund is claimed and facts sufficient to apprise the Commissioner of the exact basis thereof. The statement of the grounds and facts must be verified by a written declaration that it is made under the penalties of perjury. A claim which does not comply with this paragraph will not be considered for any purpose as a claim for refund or credit.
26 C.F.R. § 301.6402-2(b)(1). These requirements ensure that the IRS is given adequate notice of each claim and its underlying facts, so that the IRS may conduct an administrative investigation and determination. See Boyd v. United States,
"[I]n the absence of a waiver by the government, the taxpayer cannot recover in its suit for refund on a different ground than set forth in the claim for refund." Bear Valley,
The government may waive compliance with the specificity requirements of Treasury Regulation § 301.6402 — 2(b)(1) if it has investigated the merits of a claim and taken action upon it.
See Angelus Milling Co. v. Commissioner,
Nor would possible futility of Taxpayers presenting their ex post facto claim to the IRS excuse Taxpayers from stating this ground for relief in their refund claim:
An anticipated rejection of the claim, which the statute contemplates, is not a ground for suspending its operation. Even though formal, the condition upon which the consent to suit is given is defined by the words of the statute, and ‘they mark the conditions of the claimant’s right.’ Rock Island R.R. Co. v. United States,254 U.S. 141 , 143,41 S.Ct. 55 ,65 L.Ed. 188 [ (1920) ]. Compliance may be dispensed with by waiver, as an administrative act, Tucker v. Alexander, supra [275 U.S. 228 ,48 S.Ct. 45 ,72 L.Ed. 253 (1927) ]; but it is not within the judicial province to read out of the statute the requirement of its words, Rand v. United States,249 U.S. 503 , 510,39 S.Ct. 359 ,63 L.Ed. 731 [(1918)].
United States v. Felt & Tarrant Mfg. Co.,
IV.
Section 13208’s retroactive application to the eight-month period within the calendar year fits comfortably within the customary congressional practice of setting the effective dates of revenue acts prior to the dates of enactment, a practice that the Supreme Court routinely has found does not offend the Constitution. We hold that the retroactive application to Taxpayers of the tax rates set by Section 13208 neither violates due process, nor constitutes a taking, nor a direct tax requiring apportionment. In addition, we hold that the district court lacked subject matter jurisdiction over Taxpayers’ ex post facto challenge to Section 13208.
Accordingly, the judgment of the district court dismissing this action is
AFFIRMED.
Notes
. Taxpayers' refund claims did not assert violation of the Ex Post Facto Clause, art. I, § 9, cl. 3, as a ground for refund.
. The Omnibus Budget Reconciliation Act of 1989, Pub.L. 101-239, § 7304(a), 103 Stat. 2106, 2352 (1989), repealed § 2057 for estates of decedents who died after December 19, 1989.
See Carlton,
. The argument that Taxpayers did not have adequate notice of the retroactive application of Section 13208’s tax rates, a concern relevant to their due process challenge, is addressed in the discussion regarding whether Section 13208 imposes a direct tax. See infra § III, C.
. Justice Kennedy joined in the judgment that provisions of the Coal Act exceeded the legitimate authority of government, but did not agree that those provisions constituted a taking.
See id.
. Although the
National Taxpayers
court did not reach the merits of whether Section 13208's retroactive application imposed a direct tax, the court did state its view that Section 13208’s retroactive application was constitutional.
See
. Because the parties did not include the Taxpayers refund claim submitted to the IRS in the records we rely on the fact that the Taxpayers do not specifically dispute the govemment~s assertion that they did not mention their cx post facto challenge in their refund claim. (See Gov't Brief at 41; Taxpayers' Reply Brief at 11.)
. We find Taxpayers’ argument that the government waived its exhaustion argument by failing to present it to the district court wholly lacking in merit. In the government’s papers supporting its motion to dismiss, the government specifically noted that Taxpayers' refund claims did not include their claims based on the prohibition on Congress enacting ex post facto laws and argued that accordingly the district court lacked subject matter over that claim.
(See
Corr. Mem. in Support of United States’ Mtn. to Dismiss (CR 12) at 3 n.l, 10 n.4.) In addition. Taxpayers’ compliance with Treasury Regulation § 301.6402-2(b)(1) is required for federal subject matter jurisdiction, and the "[ajbsence of subject matter jurisdiction of a federal court cannot be waived and may be raised at any time.”
Dyer v. Greif Bros., Inc.,
