When Maria Gonzalez rings up a $48 lunch tab at her taqueria on Chicago’s West Side, roughly $1.20 disappears before she can count the drawer. That cut, called an interchange fee, goes to the bank that issued the customer’s credit card. “I budget for rent, I budget for produce, but I can’t budget for a fee that changes with every swipe,” Gonzalez told a panel at the Illinois Restaurant Association’s spring conference in May 2026. She is not alone. Across the U.S., interchange on credit and debit transactions totals well over $100 billion a year, according to Federal Reserve payments data, with industry estimates for credit cards alone running far higher. Illinois tried to shrink that number. On May 20, 2026, the Office of the Comptroller of the Currency made sure it couldn’t.
The OCC issued an interim final rule that takes effect June 30, 2026, exactly one day before Illinois becomes the first state to enforce restrictions on interchange charges under the Illinois Interchange Fee Prohibition Act. But the federal action reaches well beyond one state. It sets a nationwide baseline that blocks every state legislature from capping or restricting the non-interest fees that nationally chartered banks charge on credit card transactions.
What the OCC rule actually does
The OCC released two related actions in a single announcement. The first is an interim final rule covering non-interest charges and fees at national banks. The second is an interim final order aimed directly at the Illinois law. Both respond to the Illinois IFPA, enacted as Article 150 of Public Act 104-0004, which prohibits interchange fees on the tax and tip portions of card transactions starting July 1, 2026.
By setting its own effective date one day earlier, the OCC built a federal shield before the state law can take hold. In its official announcement, the agency warned that if other states followed Illinois, the resulting patchwork of fee restrictions could be “complex, potentially unworkable, and destabilizing.” That framing treats the Illinois law not as an isolated experiment but as a precedent the OCC wants to stop before it spreads.
The legal backbone here is federal preemption. National banks operate under charters granted by the OCC, a bureau of the U.S. Treasury. Under the National Bank Act, those charters give federally chartered institutions uniform powers that state legislatures cannot override when it comes to core banking activities, including setting fees. The interim final rule codifies that principle for non-interest charges specifically, closing the opening Illinois tried to use by regulating interchange at the state level.
A companion supervisory bulletin spells out the scope: the rule covers any non-interest fees that are “part of or incidental to” the business of banking, including charges tied to credit card transactions. The wording is deliberate. It tells banks, courts, and state regulators that interchange-related fees fall within the preempted category regardless of how a state statute labels them, whether as consumer protections, merchant protections, or something else entirely.
Why this matters for merchants and state legislatures
For the small-business owners who lobbied for the Illinois law, the practical result is stark: the banks that issue the vast majority of U.S. credit cards hold national charters and will continue setting their own interchange rates after July 1. The Illinois IFPA may still technically apply to state-chartered banks and credit unions, and some sizable card issuers, including certain credit unions and state-chartered community banks, do fall outside OCC jurisdiction. But those institutions account for a minority share of credit card transaction volume nationwide, which sharply limits the real-world reach of any state-only cap.
Federal law has drawn lines around interchange before. The Durbin Amendment, passed as part of the 2010 Dodd-Frank Act, already caps debit card interchange fees for banks with more than $10 billion in assets. Congress considered extending similar caps to credit cards during the Dodd-Frank debate but ultimately left credit card interchange unregulated at the federal level. The OCC’s new rule reinforces that gap by asserting that states cannot fill it on their own. Any state legislature that passes a credit card interchange cap will face the same preemption wall Illinois just hit.
The OCC’s bulletin confirmed June 30 as the operative date and noted that a 30-day public comment window, running from the date of Federal Register publication, gives stakeholders a chance to weigh in. Because the rule is already in force on an interim basis, those comments can shape the final version but will not delay enforcement or buy states extra time.
For legislators in states that have been drafting their own interchange bills, the calculus has changed overnight. Any law they enact will be unenforceable against the banks processing most of the country’s credit card swipes. That does not necessarily stop a state from passing such a bill as a political statement or as leverage in broader negotiations with federal regulators, but it strips the effort of most practical effect.
What merchants can still do
Without effective state-level caps, merchants have a narrower set of tools. They can negotiate directly with payment processors for lower rates, a strategy that works better for large retailers with volume leverage than for independent shops. They can support or join ongoing class-action litigation against card networks; the long-running Visa-Mastercard merchant settlement, which has gone through multiple rounds of court review and remains contested by some merchant groups, is the highest-profile example. And they can lobby Congress for a national interchange law that would override the OCC’s interpretation, though as of June 2026 no bill on that front has attracted enough co-sponsors to move through committee.
“Interchange fees are a hidden tax on every American consumer, and the OCC just made sure no state can do anything about it,” Doug Kantor, general counsel for the National Association of Convenience Stores, said in a statement responding to the rule. The National Retail Federation echoed that position, calling the OCC’s timing “a deliberate effort to nullify the will of Illinois lawmakers before the ink is dry.” The OCC’s move does not address the consumer-cost argument directly. It simply declares that the question of what banks charge belongs to federal regulators, not state lawmakers.
The timing underscores a structural reality: states that try to regulate card fees without a clear green light from federal authorities will keep running into preemption. Repeated requests for comment from the IFPA’s lead sponsors in the Illinois General Assembly went unanswered as of early June 2026. Whether the state attorney general will file a legal challenge, or whether supporters will try to narrow the law’s application to state-chartered institutions only, remains an open question.
Where the preemption fight goes after June 30
A court challenge is possible but would likely take years to resolve. In the meantime, national banks can point to the interim final rule as an immediate defense against any state-level attempt to cap or redirect interchange revenue. The OCC’s comment period offers one channel for opponents to argue that certain aspects of interchange regulation fall outside core banking powers and should remain within state authority, but the agency’s language so far leaves little room for that reading.
For merchants who had pinned their hopes on the Illinois law, the OCC’s action shifts the battlefield to Washington, where the banking industry’s lobbying infrastructure is far more entrenched than in any statehouse. The 41-day countdown to June 30 is not just a compliance deadline. It marks the moment the federal government asserts, in binding regulatory language, that state-by-state interchange reform is off the table. Reversing that will require either Congress writing a new law or a federal court striking the rule down. Neither path is short, and neither is guaranteed.
David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
