Whether a federal court exercising diversity jurisdiction may disregard a state statute of limitations in an equitable action based on a state-created right.
Holding
No. A federal court sitting in diversity must apply the state statute of limitations when failure to do so would permit recovery that the state court would deny.
Reasoning
The case involved no federal claim. York's asserted rights arose under state law, and the federal court was available only because the parties were citizens of different states. The Court therefore treated the federal court, for purposes of enforcing that state-created right, as another court of the state rather than as a source of an independent body of governing law.
Erie Railroad Co. v. Tompkins rejected the idea that federal courts may develop an independent general law for diversity cases. That principle applies in equity as well as at law. Although federal equity practice has its own historic limits and procedures, it does not authorize a federal court to create rights that state law denies or to enforce state-created rights on materially different terms.
The labels "substance" and "procedure" do not resolve the question. Those terms serve different functions in different legal settings. The relevant inquiry under Erie is practical: would disregarding the state rule significantly alter the outcome of litigation compared with the result in state court?
A statute of limitations that would wholly bar the plaintiff's recovery in state court plainly affects the outcome in a vital, not merely formal, way. Allowing recovery in federal court after the state limitations period had expired would encourage litigants to choose federal court to obtain a more favorable rule of law.
Diversity jurisdiction exists to offer nonresidents a neutral forum, not a different body of law. For the same transaction, the accident that one party can sue in federal court rather than in a state court nearby should not produce a substantially different result. Accordingly, the Second Circuit's contrary rule was incompatible with Erie, and the judgment was reversed and remanded.