delivered the opinion of the Court.
The Export Clause of the Constitution states: “No Tax or Duty shall be laid on Articles exported from any State.’’
*363
U. S. Const., Art. I, §9, cl. 5. We held in
United States
v.
International Business Machines Corp.,
I
The HMT, enacted as part of the Water Resources Development Act of 1986, 26 U. S. C. §§4461-4462, imposes a uniform charge on shipments of commercial cargo through the Nation’s ports. The charge is currently set at 0.125 percent of the cargo’s value. Exporters, importers, and domestic shippers are liable for the HMT, § 4461(c)(1), which is imposed at the time of loading for exports and unloading for other shipments, § 4461(c)(2). The HMT is collected by the Customs Service and deposited in the Harbor Maintenance Trust Fund (Fund). Congress may appropriate amounts from the Fund to pay for harbor maintenance and development projects, including costs associated with the St. Lawrence Seaway, or related expenses. §9505.
Respondent United States Shoe Corporation (U. S. Shoe) paid the HMT for articles the company exported during the period April to June 1994 and then filed a protest with the Customs Service alleging the unconstitutionality of the toll *364 to the extent it applies to exports. The Customs Service responded with a form letter stating that the HMT is a statutorily mandated fee assessment on port users, not an unconstitutional tax on exports. On November 3,1994, U. S. Shoe brought this action against the Government in the Court of International Trade (CIT). The company sought a refund on the ground that the HMT is unconstitutional as applied to exports.
Sitting as a three-judge court, the CIT held that its jurisdiction was properly invoked under 28 U. S. C. § 1581(f); on the merits, the CIT agreed with U. S. Shoe that the HMT qualifies as a tax.
The Court of Appeals for the Federal Circuit, sitting as a five-judge panel, affirmed.
Numerous cases challenging the constitutionality of the HMT as applied to exports are currently pending in the CIT and the Court of Federal Claims.
2
We granted certiorari,
II
As an initial matter, we conclude that the CIT properly entertained jurisdiction in this case. The complaint alleged exclusive original jurisdiction in that tribunal under 28 U. S. C. § 1581(a) or, alternatively, § 1581(i). App. 26. We agree with the CIT and the Federal Circuit that § 1581(i) is the applicable jurisdictional prescription. The key directive is stated in 26 U. S. C. § 4462(f)(2), which instructs that for jurisdictional purposes, the HMT “shall be treated as if such tax were a customs duty.”
Section 1581(a) surely concerns customs duties. It confers exclusive original jurisdiction on the CIT in “any civil action commenced to contest the [Customs Service’s] denial of a protest.” A protest, as indicated in 19 U. S. C. § 1514, is an essential prerequisite when one challenges an actual Customs decision. As to the HMT, however, the Federal Circuit correctly noted that protests are not pivotal, for Customs “performs no active role,” it undertakes “no analysis [or adjudication],” “issues no directives,” “imposes no liabilities”; instead, Customs “merely passively collects” HMT payments.
Section 1581(i) describes the CIT’s residual jurisdiction over
*366 “any civil action commenced against the United States ... that arises out of any law of the United States providing for —
“(1) revenue from imports or tonnage;
“(4) administration and enforcement with respect to the matters referred to in paragraphs (1) — (3) of this subsection . . . .”
This dispute, as the Federal Circuit stated, “involve[s] the ‘administration and enforcement’ of a law providing for revenue from imports because the HMT statute, although applied to exports here, does apply equally to imports.”
Ill
Two Terms ago, in
IBM,
this Court considered the question whether a tax on insurance premiums paid to protect
*367
exports against loss violated the Export Clause. Distinguishing ease law developed under the Commerce Clause,
The HMT bears the indicia of a tax. Congress expressly described it as “a
tax
on any port use,” 26 U. S. C. § 4461(a) (emphasis added), and codified the HMT as part of the Internal Revenue Code. In like vein, Congress provided that, for administrative, enforcement, and jurisdictional purposes, the HMT should be treated “as if [it] were a customs duty.” §§ 4462(f)(1), (2). However, “we must regard-things rather than names,”
Pace
v.
Burgess,
In arguing that the HMT constitutes a user fee, the Government relies on our decisions in
United States
v.
Sperry Corp.,
IBM
plainly stated that the Export Clause’s simple, direct, unqualified prohibition on any taxes or duties distinguishes it from other constitutional limitations on governmental taxing authority. The Court there emphasized that the “text of the Export Clause ... expressly prohibits Congress from laying any tax or duty on exports.”
The guiding precedent for determining what constitutes a bona fide user fee in the Export Clause context remains our time-tested decision in
Pace. Pace
involved a federal excise tax on tobacco. Congress provided that the tax would not apply to tobacco intended for export. To prevent fraud, however, Congress required that tobacco the manufacturer planned to export carry a stamp indicating that intention. Each stamp cost 25 cents (later 10 cents) per package of tobacco. Congress did not limit the quantity or value of the tobacco packaged for export or the size of the stamped package; “[t]hese were unlimited, except by the discretion of the exporter or the convenience of handling.”
The Court upheld the charge, concluding that it was “in no sense a duty on exportation,” but rather “compensation given for services [in fact] rendered.” Ibid. In so ruling, the Court emphasized two characteristics of the charge: It “bore no proportion whatever to the quantity or value of the package on which [the stamp] was affixed”; and the fee was not excessive, taking into account the cost of arrangements needed both “to give to the exporter the benefit of exemption from taxation, and... to secure... against the perpetration of fraud.” Ibid.
Pace
establishes that, under the Export Clause, the connection between a service the Government renders and the compensation it receives for that service must be closer than is present here. Unlike the stamp charge in
Pace,
the HMT is determined entirely on an ad valorem basis. The value of export cargo, however, does not correlate reliably with the federal harbor services used or usable by the exporter. As the Federal Circuit noted, the extent and manner of port use depend on factors such as the size and tonnage of a vessel, the length of time it spends in port, and the services it requires, for instance, harbor dredging. See
*370
In sum, if we are “to guard against... the imposition of a [tax] under the pretext of fixing a fee,”
Pace
v.
Burgess,
For the foregoing reasons, the judgment of the Court of Appeals for the Federal Circuit is
Affirmed.
Notes
The Government does not here challenge the determination that the HMT applies to goods in export transit.
According to the Government, some 4,000 cases raising this claim are currently stayed in the GIT, with more than 100 additional cases stayed in the Court of Federal Claims. See Brief for United States 4.
Because we determine that the CIT has exclusive jurisdiction over challenges to the HMT wider § 1581(i)(4), it follows that the Court of Federal Claims lacks jurisdiction over the challenges to the HMT currently pending there. See 28 U. S. C. § 1491(b). The plaintiffs in these challenges may invoke § 1631, which authorizes intereourt transfers, when “in the interest of justice,” to cure want of jurisdiction. See also § 610 (as used in Title 28, the term “court” includes the Court of Federal Claims and the CIT).
