Chase Bank USA, N. A. v. McCoy
The Supreme Court ruled that Chase did not have to warn a credit card holder in advance before raising his interest rate as a penalty for default, because the increase merely carried out a rate ceiling the cardholder agreement had already disclosed.
The Court reached that result by deferring to the Federal Reserve Board's own reading of its now-outdated disclosure rule, reinforcing that agencies get significant deference when courts can't tell what an agency's own regulation means.
How it got here: McCoy sued in state court; Chase removed to federal court; the trial court dismissed his claim, the Ninth Circuit reversed, and Chase asked the Supreme Court to resolve a split with the First Circuit.
The Case in Depth
What happened
James McCoy held a Chase credit card that offered a lower "Preferred" rate as long as he stayed current on payments; if he defaulted, Chase could raise his rate up to a preset maximum. When McCoy defaulted, Chase raised his rate and applied it retroactively without telling him beforehand. McCoy sued, claiming federal disclosure rules required advance notice of the increase.
The question before the Court
Did federal credit card rules require Chase to warn a cardholder before raising his interest rate for missing a payment, or was it enough that the contract already spelled out the maximum penalty rate?
The Court's answer
No — at the time McCoy's rate was raised, the old version of Regulation Z did not require Chase to warn him beforehand, because raising his rate to the previously disclosed maximum penalty rate did not count as changing a contract term; it simply carried out a term already spelled out in the agreement. The Court reached this conclusion by deferring to the Federal Reserve Board's own explanation of its ambiguous rule, offered in a legal brief at the Court's invitation.
The Court found the regulation's text genuinely unclear on this point, so it looked to the Board's interpretation rather than deciding the question itself. Because the Board's reading was reasonable, consistent with its past positions, and not crafted to defend its own past conduct, the Court accepted it as controlling, even though the Official Staff Commentary did not independently resolve the ambiguity.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Cardholders whose agreements set a maximum penalty rate in advance were not entitled to a separate warning before that rate kicked in under the old rule, affecting how disputes over that era's credit card practices are resolved. The decision also illustrates how much weight courts give a regulatory agency's own explanation of an unclear regulation, even when offered through a legal brief rather than formal rulemaking.
What changes now
The case goes back to the Ninth Circuit for further proceedings consistent with the Supreme Court's reading of the old Regulation Z. Because Congress and the Board later changed the underlying rules through the Credit CARD Act and updated regulations requiring 45 days' advance notice, this ruling mainly resolves disputes over credit card practices from before those changes took effect.
What this does not decide
The Court did not decide what the current disclosure rules require, since Congress and the Board have since adopted stricter 45-day advance-notice requirements. It also did not decide which side's reading of the old rule was the only reasonable one — only that the Board's own interpretation controlled.
How the Court got there
The legal reasoning, step by step
- The Court first asked whether the old version of Regulation Z's text clearly answered the question of whether a preset penalty-rate increase counts as a 'change in terms' requiring notice, and concluded the text could reasonably be read either way.
- Because the regulation was genuinely ambiguous, the Court applied Auer deference — the rule that courts defer to an agency's own reading of its unclear regulation, even one offered in a legal brief, unless that reading is plainly wrong or contradicts the rule's language.
- The Court found the Federal Reserve Board's amicus brief reliable because the Board was not a party defending its own past conduct, and its position matched views the Board had expressed years earlier in rulemaking documents, showing it reflected genuine, considered judgment rather than a litigation tactic.
- The Court considered whether the Board's Official Staff Commentary pointed a different way, but concluded the Commentary repeated the same ambiguity as the regulation itself and therefore gave no reason to reject the Board's litigation-brief interpretation.
- Applying the Board's view, the Court concluded that raising McCoy's rate to a previously disclosed maximum implemented an existing contract term rather than changing one, so no advance notice was legally required under the version of the rule in effect at the time.
Doctrinal impact
Cases affected by this decision
Reaffirms Auer v. Robbins (519 U. S. 452)
The Court relied on Auer's rule that courts defer to an agency's own reasonable reading of its ambiguous regulation.
Distinguishes Gonzales v. Oregon (546 U. S. 243)
The Court said that case involved a regulation that just restated the statute, unlike the genuinely ambiguous rule here.
Distinguishes Christensen v. Harris County (529 U. S. 576)
The Court said deference was refused there because the regulation was clear, unlike the ambiguous rule in this case.