The Maze: A U.S. appeals court has ordered another look at the costs merchants pay when customers use debit cards. On October 26, the Eighth Circuit upheld a judgment rejecting the Federal Reserve’s fee formula. It chose no replacement rate, and its decision does not take effect immediately.
The Details:
The disputed fee goes to the cardholder’s bank. Interchange compensates the bank that issued a debit card for handling a payment. Networks set the fee, which merchants ultimately pay. The 2011 rule permits covered issuers to receive 21 U.S. cents per transaction, plus 0.05% of the purchase value and a possible one-cent fraud-prevention adjustment. Issuers with their affiliates holding less than $10 billion in assets are exempt from that cap. This concerns debit cards, which draw on account funds. It does not set credit-card fees or the merchant’s entire payment-processing bill.
The fight is over which costs count. Congress told the Fed, the U.S. central bank, to consider the extra cost of processing a particular payment. The court interpreted that instruction as excluding fixed expenses that do not rise with each transaction. Its example is revealing: buying fraud-detection software upfront creates a fixed cost; outsourcing checks at a price per transaction can create a variable cost. The court allows a reasonable proxy for the extra cost. It does not require a perfect calculation for every payment. That distinction leaves the Fed work to do, rather than a ready-made new price to announce.
A long court fight still has more steps. Corner Post, a North Dakota truck stop and convenience store, challenged the rule. A 2024 Supreme Court decision allowed its case to proceed by resolving when the time limit to sue starts. The district court then rejected the rule in 2025 but paused that remedy during appeal. This week’s opinion says its effect waits for the mandate, the court’s formal order: ordinarily seven days after the rehearing deadline or a denial. Parties have 45 days to seek rehearing in this federal-agency case. A separate debit-fee appeal also remains pending in the Sixth Circuit.
MarketMaze Take: Merchants have won an argument about the bill’s ingredients. They have not received a new bill. The wider lesson for payment businesses is that a rule defining recoverable costs can change incentives as much as the headline fee. That lesson travels; this U.S. judgment does not change fees abroad.
The obvious comparison is still only a proposal. In 2023, the Fed illustrated a cut from 24.5 to 17.7 U.S. cents on a $50 debit purchase and proposed updates every other year. The appellate opinion confirms that proposal remained unadopted. Treating those figures as this ruling’s savings would confuse a possible price with an implemented one.
Cheaper acceptance is not automatically cheaper shopping. Merchant groups welcomed potential relief. Banking and payment groups counter that security and operating costs still need funding, and dispute whether retailers pass savings on. Neither position establishes this ruling’s eventual consumer-price effect. The meaningful next comparison is the lawful replacement formula and who ultimately bears the costs it excludes.
