A lawsuit filed by a single North Dakota truck stop could end up costing small businesses more money at the register, not less. That's the strange twist buried inside Corner Post, Inc. v. Board of Governors of the Federal Reserve System — a case that started as an attempt to lower debit card swipe fees and may now be on track to eliminate the fee cap altogether.
If you run a business that takes debit cards — which is to say, almost every business — this case is worth fifteen minutes of your attention. Here's what's actually happening, why it matters more than the average regulatory dispute, and what to do about it while the courts sort it out.
The Fee You've Been Paying Without Really Choosing
Every time a customer taps, swipes, or dips a debit card in your store, your payment processor routes a small "interchange fee" back to the bank that issued the card. You never see this fee itemized on a receipt, but it's baked into your processing statement, usually as a per-transaction cost plus a percentage of the sale.
Before 2011, banks set these fees however they wanted, and interchange averaged around 1.15% of the transaction. Then Congress passed the Durbin Amendment to Dodd-Frank, which told the Federal Reserve to cap debit interchange fees for large banks (those with more than $10 billion in assets) at a "reasonable and proportional" level tied to the actual cost of processing a transaction. The Fed implemented that mandate as Regulation II, setting the cap at 21 cents plus 0.05% of the transaction, with a small additional allowance for fraud prevention.
That cap has applied to large-bank debit cards for over a decade. Small community banks and credit unions under the $10 billion threshold are exempt by statute, which is part of why swipe fee costs still vary so much depending on which bank issued a customer's card.
How a Convenience Store Chain Ended Up at the Center of a Federal Case
Corner Post is a truck stop and convenience store in Watford City, North Dakota. In 2021, it sued the Federal Reserve, arguing that Regulation II set the interchange cap too high. Specifically, Corner Post claimed the Fed improperly folded in costs — fraud losses, network processing fees, transaction-monitoring systems — that go beyond the "incremental cost" of authorizing a single transaction, which is the narrow standard the Durbin Amendment actually specifies. In plain terms: merchants argued they were being overcharged relative to what the law allowed.
The case almost didn't get a hearing at all. Regulation II was finalized in 2011, and federal law generally gives plaintiffs six years to challenge a rule after it takes effect — Corner Post didn't open until 2018, well past that window under the government's reading. In 2024, the U.S. Supreme Court sided with Corner Post on this procedural question, ruling that the six-year clock starts when a business is actually injured by a rule, not when the rule was published. That decision reopened the door for Corner Post's underlying challenge to proceed — and, more broadly, made it easier for newer businesses to challenge long-standing federal regulations they never had a chance to contest before.
The Ruling That Could Backfire on Merchants
With the procedural fight settled, the case went to trial on the merits. In August 2025, a federal district court in North Dakota agreed with Corner Post: the Federal Reserve had exceeded its authority by including costs beyond the narrow "incremental cost" standard. But instead of ordering the Fed to simply recalculate a lower cap, the court vacated Regulation II outright — effectively erasing the debit interchange rule from the books. The judge stayed that vacatur pending appeal, specifically to avoid interchange fees becoming "a completely unregulated market" in the meantime.
That's the twist. A win for the merchant that sued over fees being too high could, if it survives appeal, result in no cap at all — leaving debit interchange fees to be set purely by banks and card networks, the way they were before 2011. To complicate things further, a separate district court in Kentucky ruled the opposite way in a related case, finding Regulation II lawful and reasonable. The Federal Reserve appealed the North Dakota ruling to the U.S. Court of Appeals for the Eighth Circuit, which heard oral arguments in May 2026. Both the National Federation of Independent Business and the American Bankers Association have filed dueling amicus briefs, with NFIB defending merchants' interest in a properly calculated (i.e., lower) cap and banking groups pushing the Eighth Circuit to reverse the vacatur and keep Regulation II intact.
Meanwhile, the Fed's Own Proposal Is Still Sitting on a Shelf
Separately from the lawsuit, the Federal Reserve has had its own plan to lower the interchange cap in motion since October 2023. That proposal would cut the base component roughly 30%, from 21 cents to 14.4 cents, while slightly raising the fraud-prevention allowance. After an extended public comment period that drew thousands of responses, the rule still hasn't been finalized — and the pending litigation now makes it unclear whether the Fed will finish that rulemaking, rewrite it, or shelve it entirely depending on how the Eighth Circuit rules.
So a small business owner watching this space is looking at three possible outcomes, not one:
- The Eighth Circuit reverses the vacatur — Regulation II survives, and the Fed's long-delayed proposal to lower the cap to 14.4 cents could still move forward.
- The vacatur stands and the Fed writes a new, narrower rule — a lower, more defensible cap gets adopted, closer to what Corner Post originally asked for.
- The vacatur stands with no replacement rule — debit interchange becomes unregulated for large-bank cards, and fees could rise instead of fall.
Nobody — including the parties in the case — knows which of these will happen yet.
What This Means for Your Business Right Now
You can't control how the Eighth Circuit rules, but you can control how exposed your business is to whatever comes next.
Know your actual blended rate. Most processing statements bury interchange inside a flat "discount rate," making it hard to see how much you're really paying per transaction. Ask your processor for an interchange-plus statement, which separates the interchange fee (set by banks, largely outside your control) from your processor's markup (which you can negotiate). If you don't know your blended debit rate today, you won't notice if it moves.
Model both directions. If you process a high volume of small-ticket debit transactions — coffee shops, quick-service restaurants, convenience stores — a per-transaction fee increase of even a few cents adds up fast, precisely because the fixed portion of the fee already eats a disproportionate share of a $4 sale. Run the math on what a 20–30% swing in the fixed component would do to your margins in either direction.
Watch for surcharge and discount rule changes. Several states have recently passed their own rules on debit surcharges and cash-discount programs, layered on top of whatever the Fed and card networks require. If interchange costs shift, expect processors and state legislatures to revisit those rules too.
Don't assume this resolves quickly. Regulatory litigation like this can run for years, and a ruling from the Eighth Circuit is unlikely to be the final word — the losing side has every incentive to seek further review. Build your pricing and vendor negotiations around the assumption that debit processing costs are a moving target for the foreseeable future, not a fixed line item you can set and forget.
Keep Your Books Ready for Whatever Happens Next
Whichever way this case breaks, the businesses best positioned to react are the ones who can already see their processing costs clearly — not the ones digging through a year of statements after the fact. Beancount.io offers plain-text accounting that gives you complete transparency and control over your financial data, so tracking a line item like debit interchange costs over time is straightforward rather than a forensic exercise. Get started for free and keep your books ready for whatever the courts decide.