On Oct. 26, 2026, the Eighth Circuit Court of Appeals unanimously affirmed a lower court judgment that vacated the Federal Reserve's 21-cent debit card interchange fee cap. The case is Corner Post, Inc. v. Board of Governors of the Federal Reserve System. The ruling sends the rule back to the Fed. It does not set a new price, and the sources do not say whether cardholders will pay more or less.
What the appeals court decided
The district court issued its decision in August 2025. The appeals court upheld it. According to reporting by Consumer Finance Monitor and Payments Dive, the court held that the Fed did not follow the Durbin Amendment. That law directs the Fed to base regulated debit fees on the cost of authorizing, clearing, or settling an individual transaction. It does not allow costs that are not specific to that transaction.
The Durbin Amendment was enacted as part of the Dodd-Frank Act and is codified at 15 U.S.C. § 1693o-2. It requires fees that are "reasonable and proportional" to the issuer's cost of a transaction. The Fed adopted Regulation II in 2011 to carry that out. It applies to issuers with more than $10 billion in assets.
The reporting says the Fed's cap included fixed costs, network processing fees, fraud-prevention costs, and fraud losses. The court said those went beyond what the statute allows. The ABA Banking Journal reports that the Fed must now rewrite the rule.
Why Loper Bright mattered
The court relied on Loper Bright Enterprises v. Raimondo, decided in 2024. Under that decision, courts decide for themselves what a statute means. They do not defer to an agency just because the statute is ambiguous. Here, that meant the court read the Durbin Amendment on its own terms rather than accepting the Fed's reading.
The opinion also leaves the Fed some room. Per Payments Dive, the court said the Fed does not need to match marginal cost exactly. It could use a proxy, such as average variable cost, if the proxy has a reasonable relationship to the marginal costs card issuers incur. So the rewrite does not have to start from zero.
What the fee looked like and what it means at checkout
Interchange compensates the bank that issued a debit card for processing a transaction. It is generally paid through the merchant's bank. Shoppers do not usually see it as a line item at the register.
Under the Fed's rule as described by the ABA Banking Journal, covered issuers could collect three pieces:
- 21 cents per transaction
- 0.05% of the transaction amount
- An additional 1 cent for fraud prevention
That is the formula the court rejected. No source here gives a replacement figure. The sources also do not explain how interchange changes might reach cardholders through account fees, rewards, or bank services. Treat claims of immediate price changes with caution.
The sources present two camps. Bank trade groups say the ruling threatens to keep regulated fees from reflecting real costs of processing, fraud prevention, and data protection. Retailers and merchant plaintiffs call it a victory. Both are advocacy positions about consumer effects, not forecasts. This case also covers debit only. The sources do not address credit card interchange.
What to watch next
The practical effect depends on several steps. The sources do not give dates for any of them. Here is what to track:
- The appellate mandate. Check whether it has issued, since that affects when the ruling takes practical effect.
- Rehearing or Supreme Court review. Consumer Finance Monitor notes a possible petition for rehearing en banc or for certiorari. No source says whether anyone will file.
- The Fed's remand proposal. Watch what fee structure the Fed puts forward and how it defines the costs it counts. No source gives a timeline.
- The Illinois preemption order. In OCC Bulletin 2026-17, dated April 24, 2026, the OCC announced an interim final order concluding that federal law preempts the Illinois Interchange Fee Prohibition Act. The source text is truncated, so its scope is unclear. How it interacts with federal debit fee rules is an open question.
The sources describe no choices a consumer can make in response to this ruling. For now, the useful habit is to read your bank's fee notices when they arrive and to discount any claim that this case has already raised or lowered your debit costs. The rules between banks and merchants are changing. What reaches your account depends on decisions that have not been made yet.
Sources
Reporting and records used for this article:
Please seek a professional. This article is general information, not financial, tax or insurance advice. Please seek a licensed financial, tax or insurance professional about your own situation.
