Visa Debit Case Turns On Whether Routing Counts As Its Own Market

The Justice Department's debit-card antitrust case against Visa is moving toward a discovery deadline with the core dispute focused on how broadly the US debit-processing market should be defined, Payments Dive reported.

The market-definition fight sits at the centre of an accusation that Visa preserved an illegal debit-network monopoly through contracts with merchants, acquirers and issuers.

Visa has denied the government's allegations, and an earlier dismissal bid challenged the complaint's narrow treatment of debit processing.

Debit-Market Boundary Drives The Case

The Justice Department filed the case in September 2024 under former Attorney General Merrick Garland, and President Donald Trump's administration has continued it.

The complaint says Visa handles more than 60% of US debit-card transactions on its network and collects more than $7 billion in annual processing-fee revenue.

The government complaint assigns Mastercard less than a quarter of debit processing, leaving it well behind the card network.

That framing gives the government a concentrated-market argument, while Visa can press for a broader view that includes alternatives such as ACH, pay-by-bank systems and newer payment networks.

Two attorneys following the case pointed to market definition as the issue likely to shape trial strategy.

Gregory Dickinson of the University of Nebraska College of Law described the expert phase as a fight over substitution, while Fox Rothschild's Stephen Aschettino said the side that wins the market-definition argument is positioned to win the case.

Contracts Replace Merger Evidence

The alleged monopolisation does not centre on a merger or a product-design choice.

It runs through private agreements that the government says boxed out competitors from debit routing, making the case a test of how older antitrust law applies to payment-network conduct.

The lawsuit also revives questions left by the Durbin Amendment, the 2010 measure that capped debit interchange costs and required at least two competing networks to be available for a transaction.

Dickinson argued that the current case reflects the limits of that statutory approach because the industry could shift through contract design after the rule addressed a snapshot of the market.

Visa had no comment on the case through a spokesperson.

The Justice Department did not respond to requests for comment.

Discovery Schedule Leaves Trial Timing Open

The litigation has a near-term procedural marker rather than a trial date.

The sides are due to exchange final witness lists this month and discovery is scheduled to close on Oct. 16, roughly 16 months after it began.

U.S. District Judge John Koeltl has already limited one government request tied to separate merchant antitrust litigation that Visa and Mastercard have defended since 2005.

Visa must turn over materials from parties that do not object, but it does not have to negotiate on the Justice Department's behalf with parties that oppose release.

Settlement remains possible before trial, but the source does not identify a deal or court timetable.

For now, the case turns on whether debit routing is judged as a narrow network market dominated by Visa or as part of a broader payments market with more substitutable rails.