Every merchant in Illinois that accepts credit or debit cards faces a split reality starting July 1, 2026. The state’s Interchange Fee Prohibition Act, enacted as Article 150 of Public Act 104-0004, is set to take effect on that date, capping certain swipe fees that banks can charge. But the Office of the Comptroller of the Currency has already moved to block the law from applying to any national bank or federal savings association. The OCC issued both an interim final rule amending 12 CFR 7.4002 and a separate interim final order declaring that federal law preempts the Illinois statute. With 22 days until the state law activates, the federal government and Illinois are on a collision course over who controls the fees that flow through every card transaction.
Why the OCC acted before July 1 and what it means for swipe fees
The OCC’s twin actions are not advisory opinions or policy suggestions; they carry regulatory force. In a bulletin to supervised institutions, the agency concluded that the Illinois Interchange Fee Prohibition Act conflicts with powers granted to national banks under federal law and, as a result, national banks and federal savings associations are “neither subject to nor required to comply with” the state law. That language leaves little ambiguity for the largest card-issuing institutions in the country and signals that the OCC is prepared to defend its position as a matter of supervisory policy.
The practical effect is straightforward. When Article 150 takes effect on July 1, state-chartered banks and credit unions operating in Illinois will need to comply with whatever fee restrictions the law imposes on interchange and related charges. National banks will not. This two-track system creates a competitive gap: a national bank issuing a Visa or Mastercard can continue charging interchange rates set by the card networks, while a state-chartered competitor may face limits dictated by Springfield. For merchants, the card brand on a customer’s plastic will increasingly determine which legal regime governs the underlying fees.
The OCC moved before the Illinois law’s effective date in part to avoid uncertainty in the payments market. By acting now, the agency gives national banks time to adjust disclosures, update merchant agreements, and communicate with processors before Article 150 activates. The OCC’s preemption order also puts Illinois policymakers on notice that any attempt to enforce the statute against federally chartered institutions would collide with an existing federal directive, inviting a lawsuit rather than quiet compliance.
One hypothesis worth tracking is whether national banks will converge on a uniform national swipe-fee schedule within one quarter after July 1, visible through aggregated card-network pricing filings. If the OCC’s preemption holds and no court intervenes, national banks have little reason to voluntarily match Illinois’s caps. The incentive runs the other direction, toward maintaining or even standardizing higher fee schedules across all 50 states, since federal authority now explicitly shields those pricing decisions. State-chartered banks, by contrast, may have to weigh lower interchange revenue against the reputational and customer-relations benefits of complying with a law marketed as merchant-friendly.
The federal preemption standard and 12 CFR 7.4002
The OCC grounded its preemption order in 12 U.S.C. Section 25b, the Dodd-Frank provision that codified the Barnett Bank test. Under that standard, a state consumer financial law is preempted when it “prevents or significantly interferes” with a national bank’s exercise of its powers. The OCC determined that the Illinois IFPA crosses that threshold by restricting how national banks set and collect interchange fees, which the agency characterizes as a core banking function under federal rules. In the OCC’s view, dictating the structure of those fees substitutes state judgment for bank management’s discretion, in a way Congress has already addressed through federal banking law.
The interim final rule amending 12 CFR 7.4002 reinforces that point. That regulation has long treated non-interest charges, fees, and the methods used to calculate them as business decisions of national banks, subject to safety-and-soundness oversight but not state-by-state price controls. By updating the rule, the OCC strengthens the link between its preemption analysis and an existing regulatory framework that expressly reserves fee-setting authority to national banks themselves. The amended text clarifies that state laws like the Illinois IFPA, which target the amount and allocation of interchange, fall squarely within the category of measures that “significantly interfere” with federally granted powers.
The OCC’s accompanying news release presents the move as a necessary step to preserve a uniform national banking system. According to the agency, allowing individual states to cap or redirect interchange fees for national banks would fragment the market, complicate compliance, and potentially undermine the economics of card issuance. Illinois lawmakers, however, framed Article 150 as a way to reduce costs for small merchants and prevent banks from collecting fees on portions of transactions that represent taxes or government-imposed charges.
Those competing narratives foreshadow the next phase of the conflict. Illinois regulators could attempt to enforce Article 150 against state-chartered institutions only, betting that competitive pressure will eventually force national banks and card networks to adjust their pricing. Or the state, merchant groups, or consumer advocates could challenge the OCC’s order in court, arguing that the Illinois law does not “significantly interfere” with national bank powers under the Barnett standard. Until such a challenge materializes and a court rules, the OCC’s interpretation governs for the banks it supervises.
For now, merchants in Illinois should prepare for a patchwork. Transactions routed through state-chartered issuers may reflect the new caps and restrictions, while the same purchase on a card issued by a national bank could carry a different interchange structure. That divergence is not a technical footnote; it is the visible result of a high-stakes fight over who gets to write the rules for the fees embedded in everyday payments.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
