delivered the opinion of the Court.
Thе Tax Injunction Act, 28 U. S. C. § 1341, restricts the power of federal district courts to prevent collection or enforcement of state taxes. It states: “The district courts shall not enjoin, suspend or restrain the assessment, levy or collection of any tax under State law where a plain, speedy and effiсient remedy may be had in the courts of such State.” The statute, on its face, yields no exception to the jurisdictional bar save where the state remedy is wanting, but at least one other exception is established by our cases: The statute does not constrain the power of federal courts if the
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Umted States sues to protect itself or its instrumentalities from state taxation.
Department of Employment
v.
United States,
I
Production Credit Associations (PCAs) are corporations chartered by the Farm Credit Administration under the Farm Credit Act of 1971, 85 Stat. 583, as amended, 12 U. S. C. § 2001 et seq. A PCA is a corporate financial institution organized by 10 or more farmers and designed in large part to make loans to farmers. §§2071, 2075. PCA’s have had differing tax-exempt status at different times, depending оn whether the United States owned shares of their stock. See, e. g., Farm Credit Act of 1933, 48 Stat. 267. In the period relevant here (when all PCA stock has been in private hands) they have been exempted, by explicit federal statute, from state taxes on their “notes, debentures, and other obligations.” 12 U.S.C. §2077.
Four PCA’s, respondеnts here, brought suit in the United States District Court for the Eastern District of Arkansas claiming a tax exemption going beyond the express statutory language of § 2077. They assert immunity not only from the taxes described in the exemption statute we have quoted but also from Arkansas sales and income taxes. They seek a deсlaratory judgment and an injunction prohibiting the State from levying the taxes against them. The District Court granted the PCAs’ motion for summary judgment, and a di
*825
vided panel of the United States Court of Appeals for' the Eighth Circuit affirmed.
Entitlement to the immunity is the underlying substantive issue, were we to reach it. The Tax Injunction Act, however, is an initial оbstacle, for by its terms it would bar the relief the PCA’s seek absent some exception. Seeking to overcome the bar under the Tax Injunction Act, the PCA’s, first in the trial court and now here, contended that they are instrumentalities of the United States and so not subject to the provisions of the Act any more than the United States itself. The first point is correct: PCA’s are instrumentalities of the United States because the statute which charters them says so. 12 U. S. C. §§ 2071(b)(7), 2077. The PCAs’ argument about what follows from the designation, however, is incorrect. Instrumentalities of the United States, by virtue of that designation alone, do not have the same right as does the United States to avoid the prohibitions of the Tax Injunction Act.
An observation is proper respecting our consideration of this threshold question. Although the trial court addressed the meaning and operation of the Tax Injunction Act, in the Court of Appeals the whole question seemed to disappear, though it goes to the heart of judicial authority. Neither party, we are advised, addressed the point and neither opinion in the Court of Appeals, majority or dissent, mentions it. While the question of the Act’s applicability was not raised in the State’s petition for certiorari, the United States, in an
amicus
brief in support of the petition, called our attention to the point. In granting the petition, we asked the parties to address, in addition to the merits, whether the District Court should have dismissed the case for lack of subject-matter jurisdiction in light of the Act.
We have interpreted and applied the Tаx Injunction Act as a “jurisdictional rule” and a “broad jurisdictional barrier.”
Moe
v.
Confederated Salish and Kootenai Tribes of Flathead Reservation,
II
The federal balance is well served when the several States dеfine and elaborate their own laws through their own courts and administrative processes and without undue interference from the Federal Judiciary. The States’ interest in the integrity of their own processes is of particular moment respecting questions of state taxation. In our constitutional system, the рower of the State to tax is a concurrent power. “That the power of taxation is one of vital importance; that it is retained by the States; that it is not abridged by the grant of a similar power to the government of the Union; that it is to be concurrently exercised by the two governments: are truths which have never been denied.”
McCulloch
v.
Maryland,
Enactment of the Tax Injunction Act of 1937 reflects a congressional concern to confine federal-court intervention
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in state government, a concern prominent after the Court’s ruling in
Ex parte Young,
Where the Government of the United States is a party, of course, the other side of the federal balancе must be considered. In our constitutional system the National Government has sovereign interests of its own. The necessity to respect the authority and prerogatives of the National Government underlies the now settled rule that the Tax Injunction Act is not a constraint on federal judicial power when the United States sues to protect itself and its instrumentalities from state taxation. The importance of allowing the United States to proceed in federal court to determine tax immunity questions is no doubt one reason why the exception was established with little discussion in
Department of Employment
v.
United States.
There the Court indicated the exсeption was consistent with a well-settled understanding that the Government is not bound by its own legislative restrictions on the exercise of remedial rights unless the intent to bind it is express.
We have not before now considered whether federal in-strumentalities fall under the exception to the Tax Injunction Act when they sue without the United States as co-plaintiff. In
Moe
v.
Confederated Salish and Kootenai Tribes,
we reasoned that when the United States is not a party, the mere fact that a party challenging the tax has interests closely related to those of the Federal Government is not enough, in and of itself, to avoid the bar of the Act. We considered whether the Act barred the exercise of federal judicial power when Indian tribes were challenging the lawfulness and constitutionality of certain state taxes. Although the tribes did not have formal designations as instru-mentalities of the United States, we assumed the interests they asserted were aligned with the interests of the Federal Government. Reserving the question of the precise significance of a federal instrumentality designation, the Court said this congruence of interests was not sufficient to give the tribes an exemption from the Act.
True, important consequences flow from the congressional decision to designate a PCA formed pursuant to statute as “an instrumentality of the United States.” 12 U. S. C. § 2071(b)(7). The tax immunity a PCA has under § 2077 is a permitted consequence of its status as a federal instrumentality. An instrumentality of the United States can enjoy the benefits and immunities conferred by explicit statutes, however, without the further inference that the instrumentality has all of the rights and privileges of the National Government.
Respondents attempt to counter this point by arguing that
NLRB
v.
Nash-Finch Co.,
As to the Tax Injunction Act itself, the Courts of Appeals have adopted different standards over time for deciding whether a federal instrumentality may sue in federal court to enjoin state taxation where the United States is not a co-plaintiff. Under the most restrictive approach, there is no exception to the Tax Injunction Act for federal instrumentalities unless the United States sues as a co-plaintiff. See,
e. g., United States
v.
State Tax Commission,
Under any of the tests we have described, PCA’s would not be exempt from the restrictions of the Tax Injunction Act. The United States has not joined as a co-plaintiff and indeed opposes the District Court’s exercise of jurisdiction. We need not inquire whether the holding of
Nash-Finch
— to the effect that an agency with broad regulatory power is exempt from §2283 when it sues in its own name and not through the Attorney General or in the name of the United States — is applicable as well to the Tax Injunction Act. Whatever may be the rule under the Tax Injunction Act where a federal agency or body with substantial regulatory authority brings suit, PCA’s are not entities of that description. PCA’s are not granted thе right to exercise government regulatory authority but rather serve specific commercial and economic purposes long associated with various corporations chartered by the United States. Other examples include the Atlantic and Pacific Railroad Company (chartеred under an Act of 1866 to construct and maintain a railroad and telegraph line from Springfield, Missouri, to the Pacific Ocean, see
Smith
v.
Reeves,
The PCAs’ business is making commercial loans, and all their stock is owned by private entities. Their interests are not coterminous with thosе of the Government any more than most commercial interests. Despite their formal and undoubted designation as instrumentalities of the United *832 States, and despite their entitlement to those tax immunities accorded by the explicit statutory mandate, PCA’s do not have or exercise power analogous to that of the NLRB or any of the departments or regulatory agencies of the United States. This suffices for us to conclude that instrumentality status does not in and of itself entitle an entity to the same exemption the United States has under the Tax Injunction Act.
The Tax Injunction Act is grounded in the need of States to administer their fiscal affairs without undue interference from federal courts. As all parties concede, respondents have a “speedy, plain, and efficient remedy” in state court. In holding that the PCA’s are subject to the Act’s restriction on federal-court jurisdiction, we further the State’s interests without sacrificing those of the Government of the United States.
The judgment of the Court of Appeals is reversed.
It is so ordered.
