Merchants and consumers in Illinois face a split payment system starting July 1, 2026, when the state’s Interchange Fee Prohibition Act takes effect but applies only to state-chartered banks. The Office of the Comptroller of the Currency has already declared that national banks and federal savings associations are exempt from the Illinois law, setting up a two-tier fee structure that could reshape how card-processing business flows between federally and state-supervised institutions.
Why the OCC’s preemption order changes the math for card networks
The OCC released two coordinated interim final actions this spring. One is an interim final order on the preemption of the Illinois statute, and the other is an interim final rule covering national bank non-interest charges and fees. Both appear on the agency’s 2026 bulletin index. Together, the actions confirm that federally chartered institutions can continue collecting interchange fees at existing rates even after the Illinois restrictions kick in.
The practical result is straightforward. A retailer in Chicago running a transaction through a national bank’s card program will still pay the same swipe fee on July 2 that it paid on June 30. But if that same retailer processes a transaction routed through a state-chartered Illinois bank, the new state cap applies. That gap creates a direct incentive for payment networks and acquiring banks to steer volume toward OCC-supervised issuers, where fee revenue remains uncapped.
State-chartered banks that comply with the Illinois law lose pricing flexibility on every in-state card transaction. National banks do not. Over time, that asymmetry could concentrate card-issuing activity among federally chartered institutions, especially for high-volume merchant accounts where even small per-transaction differences compound quickly. Card networks and large merchants are likely to run detailed cost analyses, weighing any operational friction of favoring national issuers against the savings from avoiding capped-fee transactions.
Smaller community banks could feel competitive pressure on both sides of their balance sheets. On the revenue side, capped interchange reduces fee income that helps subsidize free checking, rewards programs, and fraud prevention tools. On the customer side, merchants may gravitate toward acquiring relationships that minimize exposure to capped transactions, while consumers may respond to richer rewards and smoother acceptance tied to national issuers.
The OCC’s stated rationale and the documents behind it
In News Release NR 2026-32, the OCC explained why it moved before the Illinois law’s effective date. The agency said the state act “would be unworkable for payment-card systems,” according to the official announcement. That language signals the regulator views state-level interchange caps as incompatible with the national scope of card networks, where a single transaction can involve an issuing bank in one state, an acquiring bank in another, and a network headquartered in a third.
Bulletin 2026-17 is explicit that national banks and federal savings associations “are neither subject to nor required to comply with” the Illinois statute. The order does not merely suggest optional compliance or offer a grace period. It removes the obligation entirely for every institution the OCC supervises, asserting the agency’s authority to shield national banks from state laws that interfere with their powers to charge fees and set terms for card products.
The 2026 bulletin list situates the Illinois action alongside other guidance on safety and soundness, underscoring that the OCC views interchange as part of core banking operations rather than a peripheral line of business. By framing the Illinois law as a threat to the functionality of nationwide card systems, the agency also signals to other states that similar statutes could face the same fate.
No publicly available OCC data quantify how many card transactions currently pass through national versus state-chartered issuers in Illinois, and no state banking regulator statements in the record address enforcement plans or expected compliance conflicts. Those gaps matter because the real-world impact of the preemption depends on market share splits that neither side has disclosed. Without them, it is difficult to estimate how much merchant cost will actually shift, or how quickly competitive dynamics will force state-chartered banks to reconsider their product offerings.
Open questions after the July 1 split takes hold
The first open question is how aggressively card networks will move to re-route transactions. Networks could adjust default routing logic, pricing incentives, or co-brand partnerships to favor national issuers, but doing so risks political and public-relations backlash if state-chartered banks argue they are being sidelined by design rather than market preference.
A second uncertainty is how merchants will respond once they see the new fee differentials on their statements. Large chains with sophisticated treasury operations may quickly renegotiate acquiring contracts or push for routing options that minimize exposure to capped-fee transactions if those caps trigger offsetting costs elsewhere. Smaller merchants, by contrast, may lack the leverage or data to optimize routing and could simply absorb whatever blend of fees their processors pass through.
Regulatory reaction at the state level is another unknown. Illinois lawmakers could revisit the statute to narrow its scope, adjust caps, or address the competitive imbalance between charter types. They could also explore disclosure-based approaches that highlight interchange costs without attempting to regulate them directly. For now, however, no official statements outline a contingency plan if the law ends up primarily constraining state banks while leaving national banks untouched.
Finally, the Illinois experiment may influence policy debates beyond state borders. Other states considering interchange legislation will be watching to see whether the OCC’s preemption stands unchallenged and how markets adapt to a split regime. If national banks gain measurable share at the expense of state-chartered institutions, that outcome could either deter similar laws elsewhere or prompt calls for a broader federal framework that addresses interchange more uniformly.
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.
