INDUSTRYPAYMENT PROCESSING
Debit interchange in 2026: the federal cap survives because a judge stayed his own order
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Payment Review Editorial Team
Payment Review Editorial Team
Debit is the card most American businesses accept most often, and it is the one whose price is set least by the market. Since 2011 a federal rule has capped what large banks may charge to accept it. As of September 2026 that rule is technically dead — a federal judge vacated it — and simultaneously in force, because the same judge stayed his own order while the Federal Reserve appeals.
That is an unusual place for a cost line to sit, and it has produced a lot of speculative advice. The useful exercise is narrower: work out what the cap is worth to your business today. For a large share of small merchants the honest answer is nothing at all, and the reason has nothing to do with the courts.
Regulation II implements the Durbin Amendment. It applies only to debit cards issued by banks and credit unions that, with their affiliates, hold $10 billion or more in assets — the regulation calls these covered issuers. For those cards the interchange fee may not exceed 21 cents plus 0.05 percent of the transaction, and an issuer that meets the Board's fraud-prevention standards may add a further 1 cent. On a $50 debit sale that is a ceiling of about 24.5 cents.
Everything else is uncapped. In the Federal Reserve's biennial report covering 2023, covered transactions averaged $0.23 in interchange while exempt transactions — cards from institutions under the $10 billion line — averaged $0.52, more than double. Covered transactions were roughly 61 percent of the volume. The network data for 2024 tells the same story: $0.23 per covered transaction, or 0.47 percent of value, against $0.51 and 1.21 percent for exempt cards.
The number the litigation turns on is smaller than both. The Fed reported that the average cost of authorization, clearing and settlement for a covered transaction was $0.041 in 2023 — about half what it was in 2009. The cap sits several times above that figure because the Board allowed issuers to recover more than bare processing cost. That decision is the whole case.
Corner Post is a truck stop and convenience store in Watford City, North Dakota. It incorporated in 2017 and opened in 2018, seven years after the interchange standard took effect, and it was added as a plaintiff to a challenge North Dakota retail and petroleum trade associations had already filed in 2021. That timing is the whole reason the case first reached the Supreme Court in 2024 on a deadline question rather than on debit: the Court held on 1 July 2024 that an Administrative Procedure Act claim accrues when the plaintiff is injured, not when the rule was issued. A business that did not exist in 2011 could therefore still attack a 2011 rule, and the merits were finally heard.
On 6 August 2025 the US District Court for the District of North Dakota granted Corner Post summary judgment. The court held that the Board exceeded its statutory authority by including in the fee standard a category of costs that were not incremental costs of authorizing, clearing and settling a particular transaction. It vacated Regulation II — and then stayed its own vacatur pending appeal, expressly to avoid leaving interchange an entirely unregulated market in the meantime.
The Federal Reserve appealed to the Eighth Circuit. The Board filed its opening brief on 30 December 2025, Corner Post responded on 13 February 2026, banking trade groups filed amicus briefs urging reversal, and the panel heard oral argument in May 2026 — where, by the accounts of people in the room, the judges pressed the Board hard on whether fixed costs can sensibly be called incremental. No decision had issued as of early September 2026.
Two outcomes are possible and they are not symmetrical. If the Eighth Circuit reverses, nothing changes. If it affirms, the cap falls and large-issuer debit interchange becomes an unregulated price until the Board writes a new rule that survives review — and the obvious reference point for where that price goes is the exempt half of the market, which charges roughly twice as much.
Running underneath the case is a rulemaking that points the other way. In October 2023 the Board proposed lowering the cap: a base component of 14.4 cents, an ad valorem component of 4.0 basis points and a fraud-prevention adjustment of 1.3 cents, with the whole standard reset every other year from issuer cost data. In the Board's own illustration, the ceiling on an average-sized $50 debit transaction would fall from 24.5 cents to 17.7 cents. Banking and credit union trade groups have repeatedly asked the Board to withdraw the proposal. As of September 2026 it has been neither finalised nor withdrawn.
So a merchant planning for 2027 is looking at a rule that could be struck down entirely, or cut by roughly a third, and no way to know which. That is a good argument for not planning around either.
Here is the part that gets skipped. A change in interchange only reaches a merchant whose price varies with interchange. A great many small businesses are not on such a contract, and for them the entire dispute is a spectator sport.
Flat-rate processors charge one price per card, whatever the card is. Square lists 2.6% plus 15 cents for a tapped, dipped or swiped payment on its free plan, 3.3% plus 30 cents online — the same for a regulated debit card as for a premium rewards credit card. Stripe prices domestic online card payments at 2.9% plus 30 cents on the same basis, and PayPal works the same way. If the cap were repealed tomorrow, none of those published rates would move, and if the cap were cut to 14.4 cents, none of them would move either. The saving, or the cost, lands on the processor.
Cost-plus pricing does the opposite. Helcim publishes interchange plus 0.40% and 8 cents in person for merchants under $50,000 a month and states outright that if the bank's cost goes down, your cost goes down automatically. Dharma Merchant Services runs the same model at a margin of 0.15% and 8 cents card-present. Payment Depot is interchange-plus with a published markup and no monthly subscription, and Stax charges a monthly subscription of $99 to $199 and passes interchange through at zero markup, which behaves identically for this purpose. On any of these, a cap change shows up on the next statement without anyone renegotiating anything.
There is an uncomfortable corollary. A debit-heavy business on flat-rate pricing is already the merchant paying the most for the cap's existence, because the low regulated interchange is being collected by the processor rather than passed on. Before worrying about the Eighth Circuit, it is worth calculating your effective rate on debit specifically — the statement will tell you how — because that number is under your control and the litigation is not.
Regulation II has a second half that nobody is litigating, and it is the half merchants can actually use. Every debit card must be enabled to process on at least two unaffiliated payment card networks, and an issuer or network may not restrict the merchant's ability to choose between them. In October 2022 the Board finalised a rule confirming that this requirement applies to card-not-present transactions as well, effective 1 July 2023 — which is what opened online debit to routing choice.
Enabling is not routing. The issuer must make two networks available; nothing makes your acquirer send the transaction over the cheaper one. That is a commercial layer your processor or gateway either built or did not. Three questions settle it:
Treat any generic savings percentage with suspicion, including the ones in vendor marketing. Debit network pricing mixes a percentage and a fixed fee in different proportions, so the cheaper network for a $120 ticket can be the dearer one for a $6 ticket, and a routing strategy that ignores ticket size can cost money. Ask for the analysis to be run on your own transaction file, and ask to see it.
It is worth remembering how slowly the last big change in card economics actually reached merchants: the Visa and Mastercard swipe fee settlement was reported for years as a rate cut and delivered, for most small businesses, something far more modest. A vacated cap would be a genuinely large change to debit pricing. It would still arrive on your statement only through the contract you happen to be on.
