At&T Mobility LLC v. Concepcion
The Court ruled that a federal arbitration law overrides a California rule that had let courts refuse to enforce arbitration clauses banning group (class) claims in consumer contracts.
The decision makes it much harder for consumers and employees to challenge companies through class-wide arbitration, because businesses can now write contracts requiring people to arbitrate disputes one at a time.
How it got here: A federal district court denied AT&T's motion to compel arbitration, the Ninth Circuit affirmed, and AT&T asked the Supreme Court to review whether federal arbitration law preempted California's rule.
The Case in Depth
What happened
Vincent and Liza Concepcion signed a cell-phone service contract with AT&T that required arbitration of disputes but barred class or representative proceedings. After being charged sales tax on phones advertised as free, they sued, and their case was folded into a broader class action accusing AT&T of false advertising and fraud over the same practice.
The question before the Court
Could California refuse to enforce a cell-phone contract's arbitration clause just because it barred customers from bringing claims as a group?
The Court's answer
No — the Supreme Court ruled that California could not refuse to enforce AT&T's arbitration agreement just because it required customers to bring claims individually rather than as a class. The Court held that the Federal Arbitration Act requires courts to enforce arbitration agreements as written, and while states may still apply general contract defenses like fraud or duress, they cannot impose rules that, in practice, single out arbitration for disfavored treatment or change its fundamental nature.
Because California's Discover Bank rule effectively forced companies to accept classwide arbitration procedures whenever contract terms met certain conditions, the Court found that this interfered with arbitration's core benefits — informality, speed, and limited judicial review — and therefore stood as an obstacle to the federal law's purposes. The rule was preempted, and the Concepcions' case must proceed through individual arbitration as their contract specified.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Millions of consumer and employment contracts contain arbitration clauses; this ruling lets companies bar customers from banding together to pursue small claims, even when doing so on their own is impractical. Businesses gained a powerful tool to limit class-action exposure, while individual consumers with small-dollar claims may find it harder to get a lawyer or pursue relief at all.
What changes now
The case returns to the lower courts, which must now enforce AT&T's arbitration agreement as written, without a classwide arbitration requirement. Because this is a final merits ruling, the decision immediately governs how courts nationwide treat state rules that condition arbitration enforceability on availability of class procedures, reshaping the landscape for consumer and employment arbitration clauses going forward.
What this does not decide
The Court did not decide whether parties who voluntarily agree to class arbitration can have that agreement enforced, nor did it address arbitration clauses outside the consumer adhesion-contract context. Justice Thomas's concurrence flagged an alternative, narrower textual theory the majority did not adopt.
Concurrences and dissents
Concurrence — Justice Thomas
Justice Thomas agreed with the outcome but proposed a different, narrower textual test: that Section 2's saving clause only preserves defenses relating to the formation of the arbitration agreement itself, like fraud or duress, not general public-policy defenses like California's exculpatory-contract rule. He said this reading hadn't been briefed and reluctantly joined the majority's broader purposes-based approach instead.
Dissent — Justice Breyer
“We do not honor federalist principles in their breach.”Breyer's closing objection that the majority struck down a legitimate state consumer-protection rule.
Justice Breyer argued the Discover Bank rule was a neutral, generally applicable unconscionability doctrine that applied equally to contracts with and without arbitration clauses, so it did not discriminate against arbitration and should survive under the Act's saving clause. He contended class arbitration is not fundamentally incompatible with arbitration, disputed the majority's comparisons on cost and complexity, and warned that without class procedures, small-dollar consumer claims like the Concepcions' $30.22 dispute would go unpursued.
How the Court got there
The legal reasoning, step by step
- The Court read Section 2 of the Federal Arbitration Act as reflecting a strong federal policy favoring arbitration and requiring courts to enforce arbitration agreements according to their terms, treating them the same as other contracts.
- It acknowledged that Section 2's saving clause lets courts strike down arbitration clauses using generally applicable contract defenses, such as fraud or unconscionability, but not rules that specifically target or disproportionately burden arbitration.
- The Court held that even a facially general doctrine like California's unconscionability rule is preempted if applying it in practice creates an obstacle to the Act's objectives — a form of preemption that looks at whether a state rule undermines Congress's purposes, not just whether it discriminates on its face.
- Applying that framework, the Court found that forcing classwide procedures onto arbitration fundamentally changes the process, sacrificing the informality, speed, and lower cost that make bilateral arbitration attractive, and increasing risk to defendants because arbitral awards get only limited judicial review under 9 U.S.C. §10.
- Because classwide arbitration, when imposed rather than agreed to, conflicts with these core features of arbitration, the Court concluded that California's Discover Bank rule stood as an obstacle to the Act's purposes and could not survive alongside it.
Doctrinal impact
Cases affected by this decision
Abrogates Discover Bank v. Superior Court (36 Cal. 4th 148)
The California rule making most consumer class-arbitration waivers unconscionable is displaced by federal arbitration law.