The 21-Cent Debit Cap Lost in Court. Fees Haven't Moved.

A federal appeals court has upheld the ruling that vacates the Federal Reserve's 21-cent debit swipe fee cap. It hasn't taken effect, and the Fed hasn't adopted a replacement.

On October 26, 2026, the Eighth Circuit wrote in Corner Post v. Board of Governors, "We accordingly affirm the judgment of the district court," and sent the rule back so the Fed can build a fee structure that reflects the statute. Merchants are cheering. Before you rewrite a budget, read the part about timing.

Vacated Isn't the Same as Gone

Regulation II is the Fed's rule capping interchange on debit cards, the per-transaction fee a card-issuing bank charges the merchant. The rule set the cap at 21 cents plus 0.05% of the sale, and banks that followed fraud-prevention standards could add a penny. "Vacated" means a court wipes the rule off the books.

Corner Post, the merchant behind the case, filed its complaint in North Dakota federal court on April 29, 2021. It argued the rule is contrary to law and beyond the Fed's authority. In the court's telling, "in at least one merchant’s eyes, the 21-cent cap still allowed cardholder banks to charge too much." On July 1, 2024, the Supreme Court revived the case, which had been thrown out, and returned it to the lower courts. That is five years of litigation over a few cents a swipe.

Here is the sequence that matters now. On August 6, 2025, the district court said it would vacate the rule but stay that vacatur while any appeal played out, to avoid an unregulated market. The Eighth Circuit has now affirmed. But the opinion says the decision becomes effective only when the mandate issues, which happens seven days after the rehearing deadline passes, or after an order denying rehearing.

The opinion cites a 45-day rehearing window in cases involving federal agencies. Forty-five days from October 26 is December 10, 2026, and seven days after that is December 17. That is the earliest path, and anyone who files for rehearing moves it.

Then comes the gap. The remand language sets no deadline for the Fed. The district court's stay was granted pending the outcome of the appeal, and the opinion doesn't say what happens to it once the mandate issues. So the 21-cent cap may keep operating while the Fed rewrites it. As of October 2026, the Fed's Regulation II page still lists 21 cents plus 0.05% of the sale, plus one cent for issuers eligible for the fraud adjustment.

The Fed Counted the Wrong Costs

The court's reasoning is about method, not the number. It read the Durbin Amendment to point the Fed at the marginal cost of a single transaction, meaning the cost of handling one more, and to leave fixed costs out. On what that incremental cost is, the court wrote that "The Federal Reserve never decided what it is, opting instead for a 21-cent per-transaction cap."

The court also said the Fed admitted during rulemaking that some fixed costs factored into the cap. At oral argument, the Fed candidly admitted there was disagreement about what incremental cost includes.

The Fed's argument, as ABA Banking Journal summarizes its opening brief, was that the Durbin Amendment gave it "broad discretion," that it counted the right costs and that its uniform fee standards were proper. The court didn't give it the benefit of the doubt. It said deferring to an agency's reading of a statute ended with the Supreme Court's Loper Bright decision, so the panel used its own judgment.

Here is what the ruling doesn't do: pick a new number. The court said the Fed "must sort the costs into those that are transaction-specific and those that are not." Beyond that, the Fed may use a stand-in, perhaps average variable cost, as long as it tracks marginal cost reasonably closely, and fees needn't match marginal cost exactly. The court also left Corner Post's other arguments alone because it was setting the rule aside.

The Fed has been handed a math assignment with no due date.

Merchants Cheer, Banks Push Back

The Merchants Payments Coalition (MPC) says the cap applies to banks with at least $10 billion in assets, so cards from smaller issuers sit outside it. Check the Regulation II text for the current threshold before you rely on that number. MPC also argues the 2011 rate was set higher than intended by Congress.

NACS, the convenience store association, called the ruling "a step forward in a process that should lead to much lower debit card swipe fee rates." Note the word should. The statement attaches no dollar figure.

Six bank and credit union trade groups, ABA, the Electronic Payments Coalition and America's Credit Unions among them, issued a joint statement saying they are "deeply disappointed." Their objection is that the decision risks "preventing regulated interchange fees from reflecting the real costs banks incur to process transactions, prevent fraud and protect customer data." America's Credit Unions separately said the ruling "could drastically lower interchange fee caps."

Both sides expect the next cap could be lower. Neither attaches a savings figure to it.

What a $47 Debit Sale Looks Like Under Each Number

The opinion counts more than 100 billion U.S. debit purchases in 2023, worth $4.7 trillion combined. Divide the two and the average ticket is about $47, or a bit less. Here is a $47 sale under the current standard and under the Fed's pending proposal.

The current figures come from the Fed's Regulation II page. The proposal figures come from the opinion, which notes a pending Fed proposal, not yet adopted, of 14.4 cents plus 0.04% with a possible 1.3-cent fraud adjustment, and says the rulemaking doesn't change its view of the current rule.

These are ceilings on what covered issuers can charge, not your rate and not your savings. The court didn't endorse the 14.4-cent proposal, and a final rule could differ. As for timing, the Fed's 2023 memo said the proposal, if adopted, would take effect "no sooner than 60 days after the final rule is published".

Your Processor Decides What Reaches You

This ruling is about what issuing banks may charge. Nothing in it addresses what your processor charges you. If you pay a flat rate, your processor set that price, and it may not move when the cap does.

If your statement lists interchange separately from the processor's markup, compare the regulated debit line to the current standard of 21 cents plus 0.05% of the sale, plus one cent where eligible. Processor markups, monthly fees and anything else outside interchange are untouched by this case.

Our debit routing guide covers how network choice affects debit cost, and our piece on interchange inequality explains why interchange is rarely the whole bill. Both describe the 21-cent cap as the operating limit. That is still the published standard, but a court has now affirmed its vacatur, effective when the mandate issues.

This Fight Isn't Over

The first thing to watch is whether the Fed or anyone else asks for rehearing. Whether any party goes further, to the Supreme Court, isn't known yet.

A second case adds spice. In Linney's Pizza, the merchant argued the rule "includes improper costs in its calculation, resulting in too high a fee cap." A federal court in Kentucky disagreed and ruled for the Fed on September 15, 2025, finding the regulation "not contrary to law." America's Credit Unions says the two outcomes "could set up a circuit split, setting the stage for a U.S. Supreme Court appeal."

Translation: before a lower cap reaches you, you need a rehearing window to close, a mandate, a Fed rewrite and a final rule that takes effect later. Plan on a long road.

What This Means for Your Business: Check Statements, Not Prices

If you take a lot of debit, the temptation is to pencil in savings. Resist it. The replacement cap hasn't been set, so there is no savings figure to plug in.

Don't touch your prices or surcharge policy. There's no new number to price against yet. If you want to cut debit cost, lower the cost itself before you pass it to customers.

Pull three recent statements and find your debit line. Note debit volume, transaction count, average ticket and what you paid in interchange. Keep processor markup and monthly fees on a separate line in your notes, because this ruling doesn't touch them.

Ask your processor two questions, in writing. Are you on interchange-plus, where interchange and markup are separate lines, or a blended flat rate? And how will they handle a change in the regulated cap? A vague answer tells you what you need to know.

Put the dates on your calendar. Watch the rehearing deadline (around December 10, 2026, 45 days after the ruling), then the mandate, then any Fed action. Revisit your contract when the Fed acts, not before.

Frequently Asked Questions

Is the 21-cent debit cap gone?

Not yet. The appeals court's decision takes effect only when its mandate issues, and the Fed's Regulation II page still lists the 21-cent standard.

When will my debit fees go down?

No date exists. The court set no deadline for the Fed, no replacement has been adopted, and even after one is, what you pay depends on how your processor prices.

Does this ruling change credit card fees?

No. The case is about the Fed's Regulation II cap on debit card interchange, so credit card interchange isn't part of it.