Also known as:Erie analyses · Erie doctrine · Erie rule
Written by attorneys · grounded in primary & secondary sources — see below
A doctrinal framework used by federal courts sitting in diversity to determine whether state or federal law governs an issue when no federal rule or statute directly addresses the point and the substantive or procedural character of the state rule is unclear. The court weighs the competing interests of the state and the federal judicial system to decide which law to apply.
Sources & Authorities
How it applies
Common Examples
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Balance Test for Contract Clause
Ella Emerson, a State A resident, sued Eclipse Manufacturing in federal court in State A over a revenue-sharing clause in an endorsement contract negotiated and performed in State A. Eclipse argued that a uniform federal common-law rule should govern because the league operated nationwide. The court weighed State A's strong interest in regulating local contract formation and performance against any federal interest in uniformity and concluded that State A law controlled the enforceability of the clause.
Federal Rule Displaces State Service Rule
Eileen Epstein served process on Eastern Electric's compliance officer under Federal Rule of Civil Procedure 4. Eastern moved to dismiss under a stricter state rule requiring service only on designated officers. Because the federal rule directly addressed service of process and was validly promulgated, the court applied the federal rule without conducting an Erie interest balance.
Select any source to read its text and confirm it supports the definition.
Cases
Casebooks
Course Outlines
Hanna v. Plumer380 U.S. 460 (1965)
Outcome-Determinative Tolling Rule
Ezra Eastman discovered a concealed surgical error after the ordinary limitations period had run but within the state's concealment-tolling window. The defendant moved to dismiss in federal diversity court. The court held that the tolling provision was outcome-determinative and therefore substantive, requiring application of the state rule so that the result would match what a state court would reach.
Guaranty Trust Co. v. York[326 U.S.] at 110
State Choice-of-Law Rules Control
Ethan Evans sued Equinox Energy in federal court in State A over a contract signed in State B. The defendant urged the court to apply its own multi-factor conflicts analysis. The court rejected the invitation and applied State A's choice-of-law rules to select the governing substantive law, treating those rules as part of the substantive law required by Erie.
Commissioner of Internal Revenue v. Estate of Bosch387 U.S. 456, 465 (1967)
De Novo Review of State-Law Issues
Evelyn Ellison appealed a district court's interpretation of unsettled State A contract doctrine in a diversity case. The court of appeals reviewed the state-law question de novo rather than deferring to the district judge's familiarity with forum law. The appellate court explained that no special deference attaches to a district judge's reading of state law under Erie analysis.
Salve Regina College v. Russell499 U.S. 225, 238 (1991)
Valid Federal Rule Preempts State Penalty Bar
Edward Everett filed a class action in federal court seeking statutory damages under a state insurance statute that barred class actions for penalties. The defendant invoked the state prohibition. Because Federal Rule of Civil Procedure 23 directly addressed class certification and was valid, the court applied the federal rule and permitted the class action to proceed.
Shady Grove Orthopedic Associates, P.A. v. Allstate Insurance Co.559 U.S. 393 (USSC 2010)
Common questions
Frequently Asked
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When does a federal court apply the balance-of-interests test rather than a federal rule?+
The balance-of-interests test applies only when no valid federal rule of civil procedure directly addresses the issue. If a federal rule covers the point and was promulgated under the Rules Enabling Act, the federal rule controls without further weighing of state and federal interests.
Supporting sources
Why are statutes of limitations and tolling rules treated as substantive under Erie analysis?+
Statutes of limitations and tolling provisions decide whether a claim can proceed at all and therefore affect the outcome of the litigation. Because applying a different rule would produce a different result than a state court would reach, these rules are substantive and must be followed in diversity cases.
Supporting sources
What happens to choice-of-law rules after a section 1404(a) transfer between proper venues?+
The transferee court must apply the same state substantive law and choice-of-law rules that the transferor court would have applied. The transfer changes only the courtroom, not the governing state-law framework, to prevent plaintiffs from manipulating the choice of law by seeking a convenience transfer.
Supporting sources
380 U.S. 460 (1965)Conflict of Laws
…exerted strong inherent power, completely aside from the powers Congress expressly conferred in the Rules. The purpose of the Erie doctrine, even as extended in York and Ragan, was never to bottle up federal courts with outcome-determinative' and integral-relations' stoppers— when there are affirmative countervailing…