Capital One has quietly moved 25 million debit cards off Visa’s network and onto Discover’s payment rails — not primarily to improve card acceptance, but to escape a federal law that caps the fees merchants pay every time a customer swipes a debit card. The company announced on its Q2 2026 earnings call on July 22, 2026, that the migration is complete and confirmed it is already testing the same move on its credit card portfolio. JPMorgan Chase, Bank of America, Wells Fargo, and PNC have noticed — and are now in preliminary talks to buy their own network and run the same play.
The mechanism is a regulatory gap that has existed in plain sight since the Durbin Amendment was written in 2010. Large banks that issue debit cards on Visa or Mastercard’s four-party networks face a federal cap under Regulation II of $0.21 per transaction plus 0.05% of the transaction value. Discover, however, operates what lawyers call a three-party, or closed-loop, network — the same entity acts as both card issuer and transaction processor — and the Federal Reserve has held that no “routing” occurs in such systems, making the interchange cap inapplicable. By owning the Discover Network outright through its $35.3 billion acquisition that closed in May 2025, Capital One can now collect unregulated fees on those 25 million debit card swipes. Deutsche Bank analyst Mark DeVries estimated the shift raised average interchange fees paid by merchants by approximately 0.7% per transaction. Spread across more than $100 billion in annual debit purchase volume, Truist analyst Brian Foran calculated that translates to nearly $1 billion in annualized revenue gains.
Merchants — and, through them, ordinary consumers — are absorbing that cost. Exchange rate as of July 23, 2026; all figures in this article are in USD.
What Merchants Are Actually Paying Now
Before Capital One migrated its debit cards, merchants who accepted a Capital One debit swipe paid the Durbin cap: roughly $0.21 to $0.22 per transaction plus a fraction of a percent. Once a card moved to Discover’s rails, the cap stopped applying. Merchant payments consulting firm Optimized Payments modeled the impact for a typical merchant doing $1 billion in annual card volume with a 12% Capital One share: at full debit migration, annual interchange costs rise by approximately $72,000 — a 26% increase on that segment of payments. For smaller independent businesses running $50,000 to $500,000 in monthly volume, the dollar amount scales down but the percentage increase does not. Merchant Cost Consulting reported that Capital One-branded debit interchange fees can increase by more than 20 times per transaction in certain categories after the migration.
Merchants cannot opt out. They cannot refuse Capital One debit cards without refusing Capital One customers entirely, which is practically untenable for most businesses. As attorney Eamonn Moran of Holland & Knight told American Banker: “The logic is regulatory driven. Own the network and the cap disappears. Capital One demonstrated the play with its purchase of Discover, which handed it a network, and with it, an exemption its competitors don’t have.”
Capital One CFO Andrew Young confirmed on the Q2 2026 earnings call that the company has achieved the full quarterly run-rate of debit revenue synergies — the financial milestone that validates the core economic logic of the entire acquisition.
The Discover Network Has a Documented History With Merchants
Capital One inherited more than a payments network when it acquired Discover. It also inherited a $1.225 billion legal obligation.
For approximately 17 years — from 2007 through 2023 — Discover Bank misclassified roughly five million consumer credit cards as commercial credit cards in its processing system, according to the Federal Deposit Insurance Corporation. Commercial interchange rates are higher than consumer rates, so for each affected transaction, merchants were charged more than they legally owed. The misclassification resulted in more than $1 billion in overcharges to merchants and their acquirers, the FDIC determined, with approximately 98% of the excess revenue going to Discover Bank. The FDIC imposed a $150 million civil money penalty and ordered at least $1.225 billion in restitution. The Federal Reserve separately fined Discover Financial Services $100 million and entered a consent order requiring corrective action as a condition of approving Capital One’s acquisition.
Capital One accepted those obligations as part of the deal. The restitution program remains ongoing under Capital One’s ownership.
How the Durbin Loophole Actually Works
To understand why owning a payment network changes the economics so dramatically, it helps to understand what the Durbin Amendment actually regulates.
When a customer uses a debit card at a grocery store, the typical transaction flows through four parties: the customer’s issuing bank, the card network (Visa or Mastercard), the merchant’s acquiring bank, and the merchant itself. The Durbin Amendment — formally Section 1075 of the 2010 Dodd-Frank Act, implemented by the Federal Reserve as Regulation II — caps how much the issuing bank can receive in interchange for each transaction at large banks: no more than $0.21 plus 0.05% of the transaction, plus an additional $0.01 if the bank meets fraud-prevention standards.
The Discover Network (and American Express before it) operates differently. There is no separate issuer and no separate network: a single entity handles both sides. The Federal Reserve’s implementing commentary holds that there is no “routing” in a three-party system — the transaction simply does not travel from one institution to another — so the cap does not apply. Payment attorney Eric Grover of Intrepid Ventures explained the distinction to American Banker: “The Federal Reserve, in implementing the Durbin Amendment, held that the debit transaction has to be ‘routed’ from a network that is independent of the issuer to a separate issuer” — and in a three-party system, that routing never occurs.
This legal gap was always visible in the text of the statute. What changed in May 2025 was that a large bank actually owned a three-party network and had the card volume to make exploiting the gap economically meaningful.
What Does This Mean for Discover Cardholders?
While merchants absorb the fee increase on the bank side of the ledger, Discover credit cardholders will begin to feel the Capital One transition directly — and the main friction point is not fees. It is account migration.
Starting July 27, the existing Discover credit card portfolio — the so-called back book — will begin transferring to Capital One’s technology stack. Additional waves are scheduled for October 2026 and January 2027, with full migration targeted for completion by Q1 2027. Discover cardholders will be required to set up new accounts through Capital One’s website and mobile app — the single largest customer-facing friction point in the entire integration, because consumers often resist change in their financial relationships.
Some benefits change in the process. Savor cardholders who were on Mastercard previously are losing World Elite Mastercard perks, including certain travel and purchase protections, because Discover’s network has no equivalent tiered structure. Capital One has said it plans to introduce replacement benefits.
Acceptance gaps also exist. During the debit migration, some customers encountered rejected transactions at merchants that do not accept Discover — including Costco, which does not process Discover cards at all. Internationally, Discover’s acceptance varies significantly more than Visa or Mastercard, particularly outside tourist centers in markets including France and parts of Africa. Capital One has said it is working to expand Discover’s global acceptance, with near-term focus on Mexico, the Caribbean, Canada, and the United Kingdom.
Premium travel cards are being handled separately. The flagship Venture X consumer card and business cards including Spark and Venture X Business will remain on Visa and Mastercard for now. Co-branded partner cards — T-Mobile, Kohl’s, Bass Pro Shops/Cabela’s — are also staying on existing networks at least initially. Capital One explained that the Venture X’s value proposition depends on broad international acceptance that Discover cannot yet match.
How Complex Is This Integration?
Brian Riley, Director of Credit at Javelin Strategy & Research, pushed back on any suggestion that a 24-month integration timeline is slow: “Capital One is undertaking the largest card integration in the payments industry. It is complicated by the assimilation of the Discover network, more than 71 million cards, plus the debit function and the Pulse Network. And the Diners Card, which is a global ecosystem unto itself.”
The Diners Club reference captures a layer of complexity that rarely surfaces in coverage of this merger. Discover’s international brand carries a web of licensing relationships across dozens of countries, and integrating those relationships adds cross-border complexity that has no clean analog in prior bank mergers.
Fourteen months into what management has framed as a roughly 24-month integration, Capital One has captured approximately one-third of the $2.5 billion in operating expense synergies it committed to delivering by the second half of 2027. The back-office consolidation of Discover’s credit card technology stack onto Capital One’s platform — 50% of Discover front-book originations are already on Capital One’s systems as of Q2 2026 — is expected to contribute roughly $1.5 billion of that total. Full benefit is not expected until mid-to-late 2027.
On a consolidated basis, Q2 2026 results were strong. Capital One reported net income of $3 billion, or $4.73 per diluted share, with adjusted earnings per share of $5.81 after acquisition-related items. Revenue rose 4% quarter over quarter to $15.85 billion, and the net interest margin expanded to 8.01%, up 14 basis points from Q1. Against the consensus estimate of $4.85, the adjusted EPS beat was substantial.
The legacy Discover card business itself showed a different picture. Discover card loans declined 1.5% year over year, and legacy Discover purchase volume grew less than 2%. Capital One executives characterized this growth “brownout” as temporary — a consequence of Discover’s pre-acquisition pullback on new originations — and said the trough should arrive around Q4 2026 before recovery begins.
Do Other Banks Try to Follow?
The more consequential development may be what Capital One’s success is triggering across the rest of the industry.
On July 7, 2026, The Wall Street Journal reported that JPMorgan Chase, Bank of America, Wells Fargo, and PNC Financial Services have held preliminary discussions about acquiring Fiserv’s Star and Accel debit networks. The deal under discussion is valued at approximately $15 billion. The strategic logic is identical to Capital One’s: own the network, escape the cap.
If successful, the transaction would threaten to render the Durbin Amendment functionally inoperative for the largest U.S. banks. “If any of the top debit card issuers owned a debit network, the pressure for the others to get one would be very strong,” Grover told American Banker. “Imagine a world in which Bank of America, Chase, and Wells Fargo each own their own debit network. Effectively, that would make the Durbin Amendment a dead letter, because the significant majority of debit volume would then not be subject to the debit interchange price cap.”
Legal experts caution that the Star/Accel situation differs from Discover’s in a potentially important way. KBW analyst Vasundhara Govil noted that Star and Accel were “established as four-party network models issued by thousands of financial institutions in the U.S.” — meaning they were not originally structured as three-party systems the way Discover was, and regulators might view an ownership change as an attempt to circumvent Durbin’s intent rather than comply with its text. Mizuho analyst Dan Dolev pointed to ChaseNet, a prior closed-loop attempt by JPMorgan that did not succeed, as evidence that the play is harder to execute than it looks on paper. Both Govil and Dolev were quoted in American Banker.
Regulatory resistance is also possible. Daniela Hawkins of Capco noted that even under a business-friendly administration, banks pursuing such a strategy need to consider long-term regulatory risk: “Just because this administration is friendly to it doesn’t mean that the next one will be.” Senator Elizabeth Warren had already argued — before the Discover deal closed — that the combination gave Capital One the “market power to increase interchange fees charged to merchants and reduce rewards and other benefits for consumers.” DOJ declined to challenge the merger in April 2025 under the Trump administration.
Is the Durbin Amendment Effectively Dead?
Whether the Durbin Amendment survives as meaningful protection for merchants will depend on whether the Federal Reserve, Congress, or the courts draw a line somewhere between the letter of the three-party exemption and the economic reality that exemption now creates.
The law’s text has not changed. Capital One has not violated it. But the effect — a large bank routing the majority of its debit volume through an exempt network it owns, collecting uncapped interchange, and simultaneously inspiring the country’s largest banks to attempt the same — is not what Congress described when it enacted the amendment. Eric Grover’s verdict: “Capital One showed the industry how to do it, and conceptually it’s not complicated.”
For merchants — particularly smaller ones who cannot negotiate their own interchange rates — the practical result is that debit interchange, once capped, is now uncapped on cards issued by the largest credit card company in the United States. Whether it will remain uncapped on cards issued by JPMorgan, Bank of America, and Wells Fargo as well is the industry’s central payments question for the next 12 months.
Frequently Asked Questions
What is the Durbin Amendment, and why does Capital One’s Discover deal let it bypass the cap?
The Durbin Amendment is a 2010 provision of the Dodd-Frank Act, implemented by the Federal Reserve as Regulation II, that caps the interchange fee large banks can collect per debit card transaction at roughly $0.21 plus 0.05% of the purchase amount. The cap applies to four-party networks like Visa and Mastercard, where the issuing bank and the card network are separate entities. Discover operates a three-party network, in which the same entity serves as both issuer and network operator. The Federal Reserve held that no “routing” occurs in such a system, so the Durbin cap does not apply. Capital One, by acquiring Discover in May 2025, became the owner of that exempt network and can now collect unregulated interchange on the 25 million debit cards it has migrated to Discover’s rails.
What does this mean for merchants — and for prices consumers pay?
Every time a customer uses a Capital One debit card at a merchant since the migration, the merchant’s bank pays an unregulated interchange fee rather than the Durbin-capped rate. According to Deutsche Bank analyst Mark DeVries, average interchange on affected transactions rose approximately 0.7%. Merchant Cost Consulting reported that in some transaction categories the increase is more than 20 times the prior per-transaction cost. Merchants who cannot absorb the increase typically pass it on in the form of higher prices, meaning consumers who pay in any form — cash, credit, or a competitor’s debit card — may pay slightly more to subsidize Capital One’s interchange gain.
What changes for people who have a Discover credit card?
Starting July 27, Discover credit card accounts will begin migrating to Capital One’s technology platform in waves, with additional migrations planned for October 2026 and January 2027, and full completion targeted for Q1 2027. Cardholders will be required to create Capital One accounts to manage their cards. Existing rewards balances and card terms are expected to carry over, and Capital One has committed to notifying cardholders before any changes to their specific accounts. The most significant practical disruption is the account-setup requirement — and, for some cards on Mastercard previously, the loss of certain network-specific benefits that Discover’s rails do not replicate.
Should merchants or consumers be worried about the banks now trying to buy the Fiserv Star network?
Preliminary discussions are underway between JPMorgan Chase, Bank of America, Wells Fargo, and PNC about acquiring Fiserv’s Star debit network — valued at approximately $15 billion — which would potentially exempt them from Durbin caps the same way Capital One’s Discover ownership does. Legal experts disagree about whether Star and Accel, which were established as four-party networks, would actually qualify for the three-party exemption under a new ownership structure. Regulatory and antitrust scrutiny of any such deal would be intense, and legal experts have warned that a consortium ownership structure would face different — and potentially less favorable — legal analysis than Capital One’s direct single-entity ownership of Discover. If the deal did proceed and the exemption held, the Durbin Amendment would apply to a shrinking fraction of U.S. debit card volume.