Eighth Circuit Strikes Federal Reserve 21-Cent Debit Card Fee Cap

• The Eighth Circuit Court of Appeals has invalidated the Federal Reserve's 21-cent cap on debit card interchange fees.
• The court ruled that the Fed overstepped its authority by including fixed costs, such as hardware and fraud prevention, in its fee calculation.
• The Durbin Amendment, enacted in 2010, mandates that these fees be proportional only to the "incremental cost" or "marginal cost" of a transaction.
• The ruling stems from a 2021 lawsuit filed by Corner Post, a North Dakota convenience store, which argued the cap benefited larger banks.
• The Federal Reserve is now required to rework its fee cap methodology, focusing solely on variable costs directly associated with individual debit transactions.

The Federal Reserve must now develop a new rule that strictly adheres to the court's interpretation of 'incremental cost,' focusing solely on marginal expenses directly tied to individual transactions.

The Eighth Circuit Court of Appeals has mandated that the Federal Reserve Board revise its long-standing regulation governing the fees banks can charge for processing debit card transactions. This significant ruling, delivered on Monday, effectively nullifies the existing 21-cent interchange fee cap that has been in place for over a decade, impacting how banking and retail industries operate. The appellate court determined that the Fed exceeded its statutory authority by incorporating fixed costs into the formula used to calculate this cap, leaving the central bank without legal deference to support its previous methodology.

U.S. Circuit Judge David Stras, who authored the 11-page decision, explicitly stated that the Federal Reserve had no legal basis to include such costs. The case originated from a lawsuit filed in 2021 by Corner Post, a convenience store based in North Dakota. Corner Post challenged the 21-cent rate, contending that the Federal Reserve's approach went beyond the scope permitted by the relevant statute and disproportionately benefited larger financial institutions. The U.S. District Court for the District of North Dakota initially sided with the store in 2025, declaring the 21-cent cap illegal, a judgment now affirmed by the Eighth Circuit.

The invalidated 21-cent cap stemmed from the Durbin Amendment, enacted in 2010, which was designed to curb rapidly increasing "swipe fees" by requiring the Federal Reserve to ensure that interchange fees are "reasonable and proportional" to the "incremental cost" a bank genuinely incurs for a specific transaction. Following extensive lobbying efforts from the financial sector, the Fed established the nationwide limit at 21 cents. This figure was derived by including various general, fixed expenditures, such as hardware infrastructure and fraud prevention measures, in its cost calculations.

Despite not being a mandatory charge, this 21-cent limit quickly became the de facto standard rate for banks with over $10 billion in assets. However, Judge Stras's ruling clarified that Congress's intent in the Durbin Amendment was precise. He emphasized that the concept of "incremental cost" should be understood as "marginal cost," meaning only the additional expense directly attributable to one particular debit transaction. This interpretation explicitly excludes fixed costs like hardware, software, labor, and network connectivity from any future fee cap calculations, a critical aspect of US banking regulation changes.

In his detailed reasoning, Judge Stras underscored that the Federal Reserve lacked any administrative or statutory deference for its previous interpretation. He asserted that "zero deference from the Administrative Procedure Act, plus zero deference under the statute we are interpreting, still adds up to nothing," indicating a clear overreach by the board. The court rejected the Fed's defense, which was presented in May, where it argued that the cap successfully halved pre-regulation rates, thereby meeting Congress's objective of reducing fees while still allowing issuers to recoup basic transaction costs.

The Federal Reserve also raised concerns that certain expenses, such as in-house fraud detection versus outsourced per-transaction services, could be considered fixed for some banks and incremental for others. However, Stras dismissed this argument, stating that the statute treats both scenarios identically. He firmly declared that "No matter how much some banks and payment networks disagree with approaching the problem this way, the Federal Reserve does not get to revise Congress’ work," further noting that establishing a uniform cap exceeded the board's authority.

Despite the strict interpretation, the Eighth Circuit did grant the Federal Reserve some operational flexibility. The court acknowledged that achieving "perfection" in calculating exact penny costs for every transaction nationwide is unrealistic. Consequently, the Fed is permitted to utilize economic shortcuts to determine an average variable cost, as the term "proportional" does not necessitate absolute precision. This allowance suggests a path forward for the Fed to develop a revised methodology.

The immediate consequence of this ruling is the invalidation of the Federal Reserve's 21-cent debit fee cap, necessitating a complete overhaul of its regulatory framework for interchange fees. While the court has provided a clear definition of "incremental cost" and the types of expenses that can be included, the precise method by which the Fed will rework the cap remains uncertain. Corner Post, in its May arguments, suggested that the Fed could implement tiered standards based on factors such as banks’ asset size, transaction volume, and geographical location, aiming to mitigate potential administrative complexities.

This decision marks a significant development in US banking regulation changes, particularly concerning debit card interchange fees. The Federal Reserve must now develop a new rule that strictly adheres to the court's interpretation of "incremental cost," focusing solely on marginal expenses directly tied to individual transactions. The outcome will undoubtedly reshape revenue streams for financial institutions and operational costs for payment processors, as the industry awaits the Fed's revised methodology.

The invalidation of the Federal Reserve's 21-cent debit card fee cap means banks and payment processors must anticipate new regulations. Compliance officers should monitor the Fed's revised methodology for calculating interchange fees, which will now strictly adhere to "incremental cost" as defined by the court, potentially impacting revenue streams and operational costs for debit card transactions.

Source: Original reporting via news agency dispatches