This case presents, once again, questions concerning the constitutionality of the Energy Policy Act of 1992, Pub.L. No. 102-486, 106 Stat. 2776 (codified as amended in various sections of 42 U.S.C.) (“EPACT”). EPACT imposes special monetary assessments on domestic utility companies that have purchased government-enriched uranium for the purpose of commercial electricity generation, 42 U.S.C. § 2297g-1(c) (2000). In three previous decisions we rejected claims for recovery of EPACT assessments based on theories that (a) the assessments violated prior contracts between the utilities and the government and constituted takings of those contract rights,
Yankee Atomic Elec. Co. v. United States,
*1294 BACKGROUND
We have considered in detail the history and purpose of EPACT in our prior cases.
See Yankee Atomic,
The special assessment imposed on a particular utility was based on the percentage of the total number of government-produced separative work units (“SWU”) (the measurement unit used to quantify government enrichment services) that the utility purchased.
2
The Act further explained that “a utility shall be considered to have purchased a separative work unit from the Department if [it] was produced by the Department, but purchased by the utility from another source” as long as the utility had not resold the government-enriched uranium before October 24, 1992.
Id.
§ 2297g-1(c)(1)-(2). In other words, as to those utilities that submitted the uranium to the government for processing, the tax was effectively imposed on them utilization of the government enrichment services.
See Commonwealth Edison,
The relevant facts in this case are not in dispute. Union Electric is a Missouri corporation that operates various electricity-generating facilities. Prior to October 24, 1992, Union Electric owned government-enriched uranium that it had purchased both directly from the government and on the secondary market. Union Electric was liable for special assessments under EPACT, and it paid a total of *1295 $14,436,240.51 in special assessments as of the date the complaint was filed. In October of 1996 Union Electric filed a complaint in the Court of Federal Claims, claiming that it was entitled to a refund of these EPACT special assessments on a variety of theories. The Court of Federal Claims stayed the proceedings in Union Electric’s case pending the outcomes in Yankee Atomic, Commonwealth Edison, and Maine Yankee.
Following our resolution of these three cases, Union Electric filed an amended complaint in the Court of Federal Claims, where it asserted seven grounds for invalidation of the EPACT special assessments, including a claim that the special assessments violated the Direct Tax Clauses of the Constitution. 3 Union Electric claimed that the EPACT special assessments were direct taxes and therefore unconstitutional because they were not apportioned as required by sections 2 and 9 of Article I. The government filed a motion to dismiss, and the Court of Federal Claims dismissed the complaint in its entirety, finding that all the claims were governed by our court’s opinions in Yankee Atomic, Commonwealth Edison, and Maine Yankee. 4 The Court of Federal Claims held that stare decisis barred it from deciding the direct tax claim even though it had not been explicitly decided in the prior opinions. The court stated:
It is true that no Federal Circuit decision has unambiguously announced a ruling denying the unapportioned direct tax claim argued by plaintiffs. The [EPACT special assessments] litigation, however, has encompassed dozens of lawsuits, offering a spectrum of constitutional arguments against EPACT. Those arguments, including the direct tax challenge at issue here, were heard in turn by the Federal Circuit which did not regard the issue as dispositive. It cannot be assumed that the Federal Circuit has chosen to base the resolution of this complicated litigation on an unconstitutional act.... This court holds that a better reading of Commonwealth Edison, Yankee Atomic, and Maine Yankee forecloses any suit predicated on an unapportioned direct tax challenge.
Union Elec., slip op. at 6-7.
Union Electric appeals the dismissal of its direct tax claim. We have jurisdiction pursuant to 28 U.S.C. § 1295(a)(3).
DISCUSSION
We review the Court of Federal Claims’ dismissal without deference.
See First Hartford Corp. Pension Plan & Trust v. United States,
I
The first question we address is whether consideration of the direct tax issue is foreclosed by our earlier decisions. We hold that it is not.
The Court of Federal Claims declined to consider the direct tax challenge, finding *1296 that it was implicitly decided by our earlier EPACT decisions because the “[Federal Circuit] court grounded its approval of EPACT assessments on the theory that those assessments are taxes.... It is indeed untenable to assert that the court would issue that holding without simultaneously considering whether such taxes are constitutional.” Union Elec., slip op. at 6. However, the direct tax issue was not specifically argued in Yankee Atomic or Commonwealth Edison.
In
Yankee Atomic
we considered whether the EPACT tax breached the domestic utilities’ contracts with the government by “retroactively increasing the price [of] previously supplied uranium enrichment services,”
So too, we affirmed the constitutionality of the EPACT assessments in our en banc decision in
Commonwealth Edison
without considering the direct tax issue. The tax was challenged as violating Edison’s contracts with the government as well as the Takings Clause and the Due Process Clause of the Fifth Amendment. We rejected Edison’s contract claims, relying on
Yankee Atomic. Commonwealth Edison,
In
Maine Yankee
we again upheld the constitutionality of the EPACT assessments. We held that the EPACT assessments did not violate the Equal Protection Clause, rejecting the -utility companies’ argument that the foreign utility exemption of the statute unconstitutionally disadvantaged them.
Maine Yankee,
*1297
Even if
Maine Yankee
were viewed as implicitly rejecting the direct tax argument, we have repeatedly held that the disposition of an issue by an earlier decision does not bind later panels of this court unless the earlier opinion explicitly addressed and decided the issue.
See, e.g., Boeing N. Am., Inc. v. Roche,
In the circumstances of this case, we conclude that it is appropriate to decide the merits without remand. The issues are purely legal and require no fact-finding by the Court of Federal Claims. Both parties urge us to decide on the merits, and having received briefing and argument on the constitutional question, it will conserve judicial resources to decide the merits at this time. Thus, this panel will address Union Electric’s direct tax challenge on the merits.
II
Although our prior case law has definitively established that the EPACT special assessments are properly characterized as taxes,
Commonwealth Edison,
The direct tax provisions appear in Article I of the Constitution. Section 2, clause 3 provides that “direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers.” U.S. Const., art. I, § 2, cl. 3. In section 9, clause 4, the Constitution elaborates on the direct tax requirements, explaining that “[n]o Capitation, or other direct, Tax shall be laid, unless in Proportion to the Census or Enumeration herein before directed to be taken.” Id. art. I, § 9, cl. 4. The Constitution treats excise taxes differently, stating that “Duties, Imposts and Excises shall be uniform throughout the United States.” Id. art. I, § 8, cl. 1. Neither the record of the constitutional convention nor the state ratification debates defines with any clarity the meaning of the term “direct tax” in the context of personal property. See Bruce Ackerman, Taxation & the Constitution, 99 Colum. L.Rev. 1, 9-11 (1999); see also 2 The Records of the Federal Convention of 1787, at 350 (Max Farrand ed., Yale Univ. Press, 1966) (Aug. 20, 1787) (“Mr. King [a delegate to the constitutional convention] asked what was the precise meaning of direct taxation? No one answ[ere]d.”). Over the years, litigants have frequently challenged specific taxes as unapportioned direct taxes in violation of Article I, sections 2 and 9. The Constitution’s contrast of direct taxes with excise taxes has generally provided the framework for constitutional analysis in this area. 6
*1298
The first direct tax case to come before the Supreme Court was
Hylton,
which upheld an unapportioned tax on carriages.
The Court has never overruled
Hylton.
In fact, in the years since
Hylton,
the Supreme Court has repeatedly cited
Hylton
with approval in rejecting direct tax challenges.
See, e.g., Fernandez v. Wiener,
Ill
The appellant places its primary reliance on the Supreme Court decisions in
Pollock v. Farmers’ Loan & Trust Co.,
Pollock
came twice before the Court. Initially, in
Pollock I
the Court invalidated an income tax insofar as it was a tax upon the income from real property.
The appellant admits that the Sixteenth Amendment overruled the
Pollock
decisions (collectively
“Pollock”)
in part by explicitly authorizing a federal income tax “on incomes, from whatever source derived, without apportionment among the several States, and without regard to any census or enumeration,” U.S. Const. amend. XVI;
see also Utah v. Evans,
In
Pollock I
the Supreme Court confronted a federal income tax for the years 1895-1900 “upon the gains, profits, and income received in the preceding calendar year by every citizen of the United States ... whether ... derived from any kind of property, rents, interests, dividends, or salaries, or
from
any profession, trade, employment, or vocation.”
On rehearing, in
Pollock II,
the Court held that the tax on income from personal property was also an invalid direct tax.
Pollock II,
The Court, however, was clear that not all unapportioned taxes on personal property constituted invalid direct taxes. Throughout the
Pollock II
opinion the Court was careful to describe the income tax at issue as a general tax on the whole of an individual’s personal property.
Id.
at 622,
Elsewhere in the opinion, the Court again made clear that its reasoning reached only general taxes on personal property. The Court approvingly quoted Alexander Hamilton’s definition of direct taxes, which he championed in his successful litigation of Hylton:
The following are presumed to be the only direct taxes. Capitation or poll taxes. Taxes on lands and buildings. General assessments, whether on the whole property of individuals, or on their whole real or personal estate; all else must of necessity be considered as indirect taxes.
Id.
at 625,
In addition to
Hylton, Pollock
discussed other cases that rejected direct tax challenges to taxes on particular items of personal property, such as
Scholey v. Rew,
Pollock, therefore, does not teach that the EPACT special assessments are direct taxes requiring apportionment. We agree with Pollock’s conclusion that the only impermissible direct tax on personal property is a general tax on broad classes of personal property. 11 Unlike the income tax at issue in Pollock, the tax at issue here is not a general tax on the whole of one’s personal property or even a tax on a broad class of personal property. Rather, it is a carefully tailored tax, like the one sustained in Hylton and other cases, levied upon only one particular kind of personal property, government-enriched uranium. It is therefore not a direct tax.
IV
A
There is an alternative reason why the EPACT special assessments are not direct taxes. Excises are not direct taxes, and the tax at issue here is clearly an excise. The Constitution conceives of excise taxes in contradistinction to direct taxes, requiring “direct Taxes” to be “apportioned among the several States,” U.S. Const., art. I, § 2, cl. 3, while requiring “Excises [to] be uniform throughout the United States,”
id.
art. I § 8, cl. 1. Both
The Federalist
and the Supreme Court have recognized that excise taxes are not direct taxes. In
The Federalist,
Hamilton stated that “internal taxes may be subdivided into those of the direct and those of the indirect kind ... [and] the latter ... must be understood [as] duties and excises on articles of consumption.”
The Federal
*1303
ist
No. 36, at 219 (Alexander Hamilton) (Clinton Rossiter ed., 1961);
see also id.
No. 21 at 142-43. Likewise, the Supreme Court has referred to excise taxes “as the antithesis” of direct taxes.
Knowlton,
First, the EPACT tax is an excise because it taxes consumables. As
The Federalist
notes, indirect taxes include “excises on articles of consumption.”
The Federalist
No. 36, at 219;
see also id.
No. 21, at 142 (including “[i]mposts, excises, and in general, all duties upon articles of consumption” in the category of taxes not requiring apportionment). In determining that the carriage tax was an excise,
see Pollock II,
The Court embraced this consumability reasoning again in
Patton,
a case that arose well after
Pollock.
The contested statute in
Patton
imposed a tax on “tobacco and snuff, however prepared, manufactured and sold, for consumption or sale.”
Patton,
Second, the EPACT tax is an excise because its incidence falls on a particular activity related to property — here the purchase of enrichment services or enriched
*1304
uranium — as opposed to the mere ownership of property. The Court has “consistently held, almost from the foundation of the government, that a tax imposed upon a particular use of property or the exercise of a single power over property incidental to ownership, is an excise which need not be apportioned.”
Bromley,
The EPACT special assessments fall within this definition of excise taxes as well. The EPACT tax was not imposed on the mere ownership of enriched uranium. Rather, the tax was limited to purchases of government enrichment services or government-enriched uranium “for the purpose of [domestic] commercial electricity generation” prior to October 24, 1992. 42 U.S.C. § 2297g-1(c). These qualifications make clear that the special assessments were not, as the appellant urges, imposed on the mere “ownership of the uranium itself.” (Br. for Appellant at 11.)
B
We conclude that an excise tax (in contradistinction to a direct tax) is a tax imposed on the acquisition, ownership, or use of particular kinds of categories of property that falls short of being a general tax on the whole of an individual’s personal property. Also, the tax here on the ownership of government-enriched uranium purchased directly or indirectly from the government is indistinguishable from taxes on carriages, tobacco, yachts and other types of personal property that have long been accepted as excise taxes. The EPACT tax is not therefore a direct tax, and does not require apportionment.
C
The appellant alternatively argues that the EPACT tax is not an excise because it is unavoidable, the tax here having been imposed retroactively after the purchase of government enrichment services or government-enriched uranium. The appellant points out that The Federalist in general described direct taxes as being unavoidable taxes and excise taxes as being avoidable taxes. In The Federalist No. 21, Hamilton discussed the economic theory behind unapportioned “[i]mposts, excises, and, in general, all duties upon articles of *1305 consumption,” id. at 142, explaining that “[i]f duties are too high, they lessen the consumption; the collection is eluded; and the product to the treasury is not so great as when they are confined within proper and moderate bounds ... itself a natural limitation on the power of imposing them.” Id. at 142-43. Such taxes, Hamilton explained, “usually fall under the denomination of indirect taxes.” Id. at 143.
But
The Federalist
hardly describes avoidability as a necessary characteristic of indirect taxes. In
Pollock I
the Court did state that “[ojrdinarily all taxes paid primarily by persons who can shift the burden upon some one else ... are considered indirect taxes” and that general property taxes that “cannot be avoided, are direct taxes.”
Pollock I,
CONCLUSION
For the foregoing reasons, we affirm the decision of the Court of Federal Claims.
AFFIRMED
COSTS
No costs.
Notes
. The statute addressing special assessments reads:
The Secretary shall collect a special assessment from domestic utilities. The total amount collected for a fiscal year shall not exceed $150,000,000.... The amount collected from each utility ... for a fiscal year shall be in the ratio ... as the total amount of separative work units such utility has purchased from the Department of Energy for the purpose of commercial electricity generation, before October 24, 1992, bears to the total amount of separative work units purchased from the Department of Energy for all purposes ... before October 24, 1992.
42 U.S.C. § 2297g-1(c) (emphasis added).
. An SWU measures “the amount of energy required for the enrichment of each utility's uranium.”
Fla. Power & Light Co. v. United States,
. The relevant constitutional provisions read as follows:
Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers....
U.S. Const., art. I, § 2, cl. 3.
No Capitation, or other direct, Tax shall be laid, unless in Proportion to the Census or Enumeration herein before directed to be taken.
Id. art. I, § 9, cl. 4.
Duties, Imposts and Excises shall be uniform throughout the United States.
Id. art. I, § 8, cl. 1.
. Union Electric’s complaint also raised a claim that the EPACT tax violated the Ex Post Facto Clause of the Constitution. The Court of Federal Claims rejected this claim based on the Supreme Court's decision in
Calder v. Bull,
. The complaint did not raise the direct tax issue. At oral argument in the Court of Federal Claims, counsel for the appellant, Sacramento Municipal Utility District, appeared to admit that the issue had not been properly raised. He suggested the direct tax argument at oral argument in the Court of Federal Claims and explained: "I'm reluctant to thrust this on the Court because it's a little half-baked. We haven't had a chance to brief it to the Court and we’re catching [Government counsel] by surprise, and I apologize for *1297 that.” Oral Argument Transcript, Maine Yankee, Nos. 97-28C, 95-823C, 96-616C, at 82 (Fed.Cl. May 18, 1999).
. Supreme Court decisions have recognized, however, that there may be indirect taxes that are not excise taxes. For example, Justice Chase stated in
Hylton v. United States,
If there are any other species of taxes that are not direct, and not included within the words duties, imposts, or excises, they may be laid by the rule of uniformity or not, as congress shall think proper and reasonable.
*1298 If the framers of the constitution did not contemplate other taxes than direct taxes, and duties, imposts and excises, there is a great inaccuracy in their language. If these four species of taxes were all that were meditated, the general power to lay taxes was unnecessary.
Id.
at 173,
. The appellant also cites
Dawson v. Kentucky Distilleries & Warehouse Co.,
. While some earlier cases appeared to approve of the reasoning in
Pollock, see Thomas,
. Indeed,
Pollock
did not even explicitly overrule the Supreme Court's earlier decision in
Springer,
. See also Jensen, 97 Colum. L.Rev. at 2375 (Pollock was precedent shattering but, despite its logic, it had little influence outside the income-tax area. After (and despite) Pollock, the Supreme Court continued to view the direct-tax rules narrowly. Several cases made it clear that Pollock was to be given no expansive interpretation; the Pollock analysis was not to be extended to overturn other once-settled rules.” (footnote omitted)).
. In
Eisner v. Macomber,
. Union Electric requests in a footnote that "if this Court chooses to remand ... [it] make clear that the Court of Federal Claims erred in dismissing Union Electric’s contract claim.” (Br. for the Appellant at 52 n. 11.) The appellant's contract claim is foreclosed by our earlier decisions in Yankee Atomic and Commonwealth Edison.
