Interchange and assessment fees are two charges that drive most of what a business pays to accept credit cards, and both are treated as pass-through costs printed on every merchant statement. Merchants are quick to blame their payment processor for the high fees, but that isn't often the case.
Neither of these charges can be negotiated. Interchange is set by the card networks and paid to the bank that issued the customer's card, whereas assessment fees are lower and go directly to Visa and Mastercard.
This guide covers what separates interchange from assessment fees, how interchange drives your monthly statement math, and how to tell a genuine pass-through cost from processor markup that can be recovered.
What is the difference between interchange and assessment fees?
Interchange is the fee the card networks set and route to the bank that issued the customer's card. It is the largest single component of card-processing cost for most merchants, and it varies by card type, transaction size, industry and how the payment was entered. Assessment fees are the networks' own cut, charged by Visa and Mastercard on total volume and published in their fee schedules. They sit in a narrow, fixed band and barely move.
Both are pass-through costs; the processor collects them and forwards them to the networks, the processor cannot discount them, and no amount of shopping around changes them. What a processor can change is its own markup, the layer added on top of interchange and assessments. That markup is the negotiable part of a statement, and it is where fee padding hides. This is why Verisave often recommends optimizing a merchant account first before too quickly going down the route of switching processors.
| Fee | Set by | Paid to | Typical range | Negotiable |
|---|---|---|---|---|
| Interchange | Visa, Mastercard, Discover, Amex networks | The customer's card-issuing bank | Roughly 1% to more than 3% per transaction, by card and entry method | No |
| Assessment fees | Visa and Mastercard | The card networks | About 0.13% to 0.15% of volume | No |
| Processor markup | The processor | The processor | Varies widely | Yes |
How does interchange show up on your merchant statement?
On an interchange-plus statement, interchange is itemized: you see the network's category, the rate, and the markup listed separately. However, on a bundled statement, interchange is folded into blended buckets labeled "qualified," "mid-qualified," and "non-qualified," which hide the underlying rate and make padding almost impossible to spot. The pricing model on your statement decides how much you can see in the first place.
Interchange is also why two businesses with identical revenue can pay very different effective rates. A company taking mostly keyed-in commercial cards pays far more interchange than one taking swiped consumer debit, because commercial and rewards cards carry higher interchange categories and card-not-present entry downgrades a transaction to a more expensive rate. None of that is markup, it is the card mix and the way transactions are captured.
The practical read: interchange is the biggest number on the statement and the one that moves most once an account is corrected. Verisave's published case studies show accounts that started near a 3% overall effective rate optimized down toward 2%, with most of that gap closed by fixing interchange rather than renegotiating the processor. When interchange runs higher than it should, the cause is usually a fixable setup problem, not the headline processor rate.
| Non-optimized account | Optimized account | |
|---|---|---|
| Overall effective rate | Roughly 3% or higher | About 2% (mid-market B2B) |
| Interchange | Downgraded categories, missing Level 2 and Level 3 data | Correct categories, complete data passed |
| Statement type | Often tiered or blended, so the rate is hidden | Interchange-plus, so the rate is visible |
| Processor markup | Padded and hard to isolate | Separated and reviewable |
Identifying a pass-through cost from processor markup
Every merchant statement carries costs a business cannot change and costs it can, and the key is to identify and separate the two. As outlined earlier, interchange and assessments are fixed by the networks and the issuing banks, but everything else, the discount rate, per-item fees, monthly fees, statement fees, gateway fees, PCI charges and vaguely named "service" or "network" line items, is set by the processor or introduced somewhere in the account setup.
There are a few recognizable patterns which may signal recoverable cost rather than genuine pass-through:
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Interchange downgrades. Transactions fall to more expensive categories because required data, such as invoice detail or Level 2 and Level 3 fields, were never submitted to the processor. This is a data-flow problem between the gateway, ERP and processor, and it is fixable without touching interchange itself.
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Padded interchange. On tiered pricing, the "qualified" rate charged to the merchant sits above the true network rate, and the gap is silent margin.
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Duplicate or mislabeled fees. Assessment-style line items charged above the published network band, or the same fee appearing twice under two names.
None of these require switching processors to fix and they live in how the merchant account is configured and how transaction data moves. A basic audit of a merchant account will look for these patterns first.
Why is the effective rate so important and what does it tell you?
The effective rate is the one number that cuts through statement complexity. It is calculated by taking the total processing fees divided by total card volume for the month. It rolls interchange, assessments, and markup into a single figure you can benchmark.
The Nilson Report puts the average U.S. merchant effective rate near 1.57%. Mid-market B2B merchants usually run higher, often in the 2% to 2.5% range even when well optimized, because commercial cards and keyed transactions carry heavier interchange. An effective rate above 3% is worth investigating. That alone does not prove overcharging, since card mix and ticket size move the number, but it is the clearest sign that a statement deserves a line-by-line review.
Frequently asked questions
Are interchange and assessment fees the same as processing fees?
They are two parts of it. "Processing fees" is the umbrella term for everything on a merchant statement: interchange paid to the issuing bank, assessments paid to the card networks, and the processor's own markup. Interchange and assessments are the pass-through parts.
Can a processor lower my interchange rate?
No. Interchange is set by Visa, Mastercard, Discover and American Express and paid to the card-issuing bank, so no processor can discount it. A processor can lower its own markup, and an account can be configured so transactions qualify for cheaper interchange categories, but the published interchange rate itself does not change.
How do I know if I am overpaying on my merchant statement?
Start with the effective rate, then check whether interchange is itemized or blended. A tiered, blended statement combined with an effective rate well above the benchmark for your business type are the two most common signs that a professional review is worth the time.
Read your next statement differently
Most merchant statements are not overpriced at the headline rate. The cost leakage sits somewhere else: interchange categories that quietly downgraded, invoice data that never reached the processor, and markup buried inside blended pricing. Verisave reviews merchant statements to find exactly that, working inside your existing account with no processor switch. Send a recent statement for a free audit and see what your effective rate is really telling you.
