AT&T Mobility LLC v. Concepcion
The Supreme Court ruled that federal arbitration law overrides a California rule that had let courts throw out contract clauses banning class-wide arbitration, because that rule got in the way of arbitration's basic purpose of resolving disputes quickly and informally.
The decision means companies can generally use standard contracts to force customers into one-on-one arbitration instead of group lawsuits or group arbitration, even when the disputes involve small amounts of money, reshaping how consumers can challenge corporate practices nationwide.
“Requiring the availability of classwide arbitration interferes with fundamental attributes of arbitration and thus creates a scheme inconsistent with the FAA.”
The majority's core reasoning for why California's rule conflicts with federal arbitration law.
How it got here: AT&T moved to compel individual arbitration; the district court and the Ninth Circuit both refused, citing California's Discover Bank unconscionability rule, and AT&T appealed to the Supreme Court.
The Case in Depth
What happened
The Concepcions signed up for AT&T cell phone service that included supposedly free phones, but they were charged sales tax on the phones' retail value. They joined a broader lawsuit accusing AT&T of false advertising and fraud. Their service contract required disputes to go to individual arbitration and barred class or representative claims.
The question before the Court
Can a state make it illegal for companies to require consumers to give up their right to join a class-action arbitration, even though the consumers signed a contract agreeing to arbitrate individually?
The Court's answer
No — a state cannot use its unconscionability law to strike down class-action waivers in arbitration contracts, because doing so conflicts with the federal Arbitration Act. The Court held that California's Discover Bank rule, which had voided many class-waiver clauses in consumer contracts as unconscionable, stood as an obstacle to the Act's goal of ensuring that arbitration agreements are enforced according to their terms.
The Court explained that forcing classwide procedures onto arbitration fundamentally changes it — making it slower, more formal, and riskier for companies — so a state cannot require it even under a neutral-sounding contract doctrine like unconscionability. Because arbitration agreements must be enforced as written, AT&T's individual-arbitration clause with the Concepcions had to be honored, and the lower courts' refusal to compel arbitration was reversed.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Millions of consumer contracts — for cell phones, credit cards, and other everyday services — contain arbitration clauses that bar class actions. This ruling makes those clauses easier to enforce nationwide, meaning individual customers with small claims often must arbitrate alone rather than banding together, which can make some claims too costly to pursue at all.
What changes now
The case goes back to the lower courts, which must now enforce AT&T's arbitration agreement with the Concepcions on an individual basis rather than allowing the class action to proceed. This is a final merits ruling, not a temporary order, and it set the framework courts nationwide now use to evaluate whether state contract-law rules can be applied to void class-action waivers in arbitration agreements.
What this does not decide
The Court did not hold that all state contract defenses conflict with the FAA — only that states cannot use even generally worded rules like unconscionability to force classwide procedures onto arbitration when doing so undermines arbitration's basic features. States remain free to apply ordinary contract defenses that do not specifically target or effectively gut arbitration.
Concurrences and dissents
Concurrence — Justice Thomas
Justice Thomas agreed with the outcome but would have used a narrower textual reading of the FAA: courts can refuse to enforce an arbitration agreement only based on defects in how the agreement was formed (fraud, duress, mistake), not on public-policy grounds like unconscionability aimed at the contract's terms. Under his view, California's Discover Bank rule fails because it targets exculpatory terms, not contract formation, so it is preempted regardless of the majority's obstacle-preemption analysis. He called his own approach undeveloped by the parties but joined the majority for the sake of giving lower courts clear guidance.
Dissent — Justice Breyer
Justice Breyer argued that California's Discover Bank rule is an ordinary, evenhanded unconscionability rule that applies equally to litigation and arbitration contracts, so it does not discriminate against arbitration and fits comfortably within the FAA's saving clause. He contended the majority wrongly compared class arbitration to bilateral arbitration instead of to class litigation, and that class procedures actually help resolve small-dollar claims that would otherwise go unpursued. He would have affirmed the Ninth Circuit and let California's rule stand.
How the Court got there
The legal reasoning, step by step
- The Court applied the FAA's saving clause, which lets states void arbitration agreements only using 'generally applicable contract defenses' like fraud or unconscionability, but not rules that single out or specially burden arbitration.
- The Court reasoned that even a facially neutral doctrine like unconscionability can be applied in a way that discriminates against arbitration if it demands procedures — like classwide proceedings — that are fundamentally incompatible with arbitration as Congress envisioned it.
- Comparing bilateral and class arbitration, the Court found that class arbitration requires much more formal procedures (certifying a class, protecting absent parties, more discovery) and takes far longer to resolve than individual arbitration, based on data from the American Arbitration Association.
- The Court concluded that class arbitration also exposes companies to much larger, harder-to-review awards with only limited judicial review under 9 U.S.C. § 10, making it unlikely Congress intended states to be able to force this risk onto parties who agreed to individual arbitration.
- Because requiring the availability of classwide arbitration interferes with these fundamental features of arbitration, the Court held that California's Discover Bank rule creates an obstacle to the FAA's purposes and is therefore preempted.
Doctrinal impact
Cases affected by this decision
Abrogates Discover Bank v. Superior Court (36 Cal. 4th 148)
The Court held this California rule against class-arbitration waivers is preempted by federal arbitration law.
Reaffirms Stolt-Nielsen S. A. v. AnimalFeeds Int'l Corp. (559 U.S. 662)
The Court relied on this earlier ruling that shifting from bilateral to class arbitration is a fundamental, consequential change.