The Chickasaw Nation owns and operates the Chickasaw Motor Inn in Sulphur, Oklahoma. At the inn, the Tribe conducts bingo games and sells cigarettes. Oklahoma filed a complaint against the Chickasaw Tribe and Jan Graham, who managed the enterprise for the Tribe, to collect unpaid state excise taxes on the sale of cigarettes and taxes on the receipts from the bingo games. The Chickasaw Nation, asserting federal-question jurisdiction under 28 U. S. C. § 1381, removed the action from the State District Court in Murray County to the United States District Court for the Eastern District of Oklahoma. The State moved to remand the case, arguing in part that the complaint alleged on its face only state statutory violations and state tax liabilities. The District Court, however, denied the motion. It noted that the complaint sought to apply Oklahoma law to an Indian Tribe and so implicated the federal question of tribal immunity. App. to Pet. for Cert. A25-A26. Shortly thereafter the District Court dismissed the State’s suit, finding it barred by tribal sovereign immunity. Id., at A27-A30.
A divided panel of the Tenth Circuit affirmed.
Oklahoma ex rel. Oklahoma Tax Comm’n
v.
Graham,
We vacated the Tenth Circuit’s decision and remanded for reconsideration in light of our discussion of removal jurisdiction and the well-pleaded complaint rule in
Caterpillar Inc.
v.
Williams,
We think the decision of the Court of Appeals is plainly inconsistent with
Caterpillar
and reverse it. “Except as otherwise expressly provided by Act of Congress,” a case is not properly removed to federal court unless it might have been brought there originally. 28 U. S. C. § 1441(a). In the present case, the sole alleged basis of original federal jurisdiction is 28 U. S. C. § 1331, giving district courts “original jurisdiction of all civil actions arising under the Constitution, laws, or treaties of the United States.” The presence or absence of federal-question jurisdiction is governed by the “well-pleaded complaint” rule. “[Wjhether a case is one aris
*841
ing under [federal law], in the sense of the jurisdictional statute, . . . must be determined from what necessarily appears in the plaintiff’s statement of his own claim in the bill or declaration, unaided by anything alleged in anticipation of avoidance of defenses which it is thought the defendant may interpose.”
Taylor
v.
Anderson,
In
Caterpillar,
we ruled that the application of the well-pleaded complaint rule defeated federal-question jurisdiction, and therefore removability, in a case in which employees sued on personal, state-law employment contracts. We refused to characterize these state-law claims as arising under federal law even though an interpretation of the collective-bargaining agreement might ultimately provide the employer a complete defense to the individual claims, and even though employee claims on the collective-bargaining agreement would have been the subject of original federal jurisdiction.
Caterpillar, supra,
at 396-398. The state-law tax claims in the present case must be analyzed in the same manner. Tribal immunity may provide a federal defense to Oklahoma’s claims. See
Puyallup Tribe, Inc.
v.
Washington Game Dept.,
The jurisdictional question in this case is not affected by the fact that tribal immunity is governed by federal law. As the dissent below observed, Congress has expressly provided by statute for removal when it desired federal courts to adjudicate defenses based on federal immunities. See
*842
Willingham
v.
Morgan,
As this case was improperly removed from the Oklahoma courts, the merits of the claims of tribal immunity were not properly before the federal courts, and we express no opinion on that question.
The judgment of the Court of Appeals is
Reversed.
