Understanding the Rising Cost of Credit Card Processing for U.S. Merchants
In 2025, U.S. merchants paid a staggering $198.25 billion in credit and debit card processing fees, marking a 219% increase since 2009. This jump, as reported by the Nilson Report and highlighted by the Merchants Payments Coalition, positions card acceptance as the largest operating cost for many businesses after labor. Such figures naturally raise the question: Have the card networks dramatically increased their rates to justify this surge?
Surprisingly, the answer is no. When the Government Accountability Office (GAO) examined interchange fees in 2009, Mastercard’s highest interchange rate stood at 3.25%. Seventeen years later, it has inched up only slightly to 3.30%. Visa’s top rate was 2.95% then, and while it has recently risen to 3.15%, most transactions still clear at 2.95% or less. This suggests that the sheer increase in card usage largely drives the total fees paid by merchants, rather than skyrocketing base rates.
So, why do many merchants notice their effective card processing costs increasing year after year despite stable interchange rates? The culprit lies in the processor’s markup and additional fees layered on top of interchange. Having spent over a decade in the credit card processing division of a commercial bank—including leadership roles at Fifth Third Processing Solutions, Vantiv, and Worldpay (now part of Global Payments)—I have firsthand experience with these practices.
During the Great Recession, when transaction volumes declined, revenue for processors dropped. Instead of absorbing the loss, processors introduced new fees. For example, an $8.95 monthly charge per merchant ID was rolled out with enthusiasm at board meetings, despite its impact on merchants. This approach motivated me to leave the industry in early 2009, as I could no longer align my work with my personal values.
The Hidden Costs and Why They Matter
Interchange—the wholesale cost processors pay to card networks—accounts for roughly 80% to 90% of what merchants should expect to pay. A competitive processor markup over interchange can be as low as 0.02% to 0.05%. However, markups commonly range from 0.15% to 0.90%. To put this into perspective, on $2 million in annual card sales, the difference between a 0.50% markup and a 0.05% markup could cost a merchant $9,000 annually, excluding additional “junk” fees.
Unfortunately, audits conducted by firms I co-founded reveal overbilling in approximately 99% of merchant statements reviewed. Moreover, over 90% of merchant accounts are improperly set up from the start, leaving businesses vulnerable to excessive charges.
Five Essential Questions to Ask Your Credit Card Processor
Before signing any agreement, merchants should obtain clear, written answers—signed by an authorized company officer—to the following five questions. This documentation not only exposes hidden markups but also protects businesses from unexpected charges down the line.
1. Is my rate fixed, or can you raise it without my signature?
Most merchant agreements permit processors to change fees and terms unilaterally, typically with little more than a notice buried in fine print on monthly statements. Since Visa and Mastercard roll out hundreds of rate and rule changes semi-annually, processor increases often go unnoticed. A signed rate is merely a starting point, not a guarantee.
2. Will you show me your markup separately from interchange?
This question is critical. Interchange-plus pricing clearly itemizes interchange fees and processor markups separately, revealing exactly what processors retain. Conversely, tiered or flat-rate pricing bundles these costs, obscuring true markup. If a processor refuses to unbundle, it is deliberately concealing its profit. Follow up by asking whether interchange is passed through at cost or padded.
3. What happens if I want to leave?
Review the contract for early termination fees, liquidated damages clauses, and equipment leases that may survive contract expiration. Auto-renewal clauses often require cancellation within narrow windows, sometimes extending to 90 days before renewal. Missing these windows can lock merchants into extended terms unknowingly.
4. Which fees on my statement do you control?
While card brands set interchange and network assessments, processors control many additional fees—even those labeled to sound official, such as “Annual PCI Fee” or “Regulatory Compliance Fee.” These are often pure profit. Request that your processor clearly label each fee as either a pass-through or processor-controlled. Anything under their control is open to negotiation.
5. Will you put every verbal promise in writing?
Verbal assurances of low rates or price matching mean nothing unless included in the contract. Many sales reps offer enticing terms that vanish after a promotional period or cannot be substantiated later. Ensure all promises are documented in the agreement.
The Contract Is Your Only Protection
Even the best rates are meaningless if the contract allows processors to alter fees at will. Merchants should negotiate contracts as rigorously as pricing—limiting or eliminating termination fees, curtailing auto-renewals, and locking in markups in writing.
Vigilance is key. Processors rely on merchants’ lack of understanding of complex billing statements and the daily demands of running a business to let accounts drift, resulting in overcharging. Unlike typical vendor agreements, merchant processing gives the processor direct access to your bank account—the so-called “keys to the kingdom.” They withdraw funds first, then send a statement that is often difficult to decipher or verify.
Whether negotiating a new contract or reviewing an existing one, consider using a firm specializing in credit card processing audits to protect your business. Be cautious and research thoroughly; avoid firms masquerading as auditors but operating as processors. Check credentials such as Better Business Bureau ratings and LinkedIn profiles. Also, avoid contracts that lack month-to-month terms or money-back guarantees.
By asking the right questions, demanding transparency, and understanding the fine print, merchants can regain control over one of their largest expenses and significantly improve their bottom line.
