What Is Interchange? The Wholesale Cost Behind Every Card Payment

Interchange is the wholesale, non-negotiable cost set by Visa, Mastercard, Discover, and American Express that every business pays every time a customer swipes, dips, or taps a card. No processor in the US can beat it, waive it, or negotiate it on your behalf—it is the same floor price for every company in the industry. What does vary is the markup a processor adds on top of that cost. Understanding the difference is the single most important thing you can do to evaluate your card processing cost and make sure you're not overpaying.

What Interchange Actually Is

Think of interchange like the wholesale price a retailer pays to stock a product. The retailer can't sell below what they paid for it, and they can't change what the manufacturer charges. Interchange works the same way.

When a customer pays you with a credit or debit card, a small percentage of that transaction—plus sometimes a small flat fee—flows from your bank (the acquiring bank) to the customer's bank (the issuing bank). The card network, say Visa or Mastercard, sets the rules for how much that transfer costs. That transfer cost is interchange.

The issuing bank keeps the interchange revenue to cover its costs: fraud losses, rewards programs, cardholder services, and the risk of extending credit. The card network collects its own smaller assessment fee on top. Neither of those costs is set by your processor.

Why Interchange Is Non-Negotiable

The card networks publish hundreds of interchange categories in tables that are updated periodically—often twice a year. Every merchant, every bank, and every processor in the country pays from the same published schedule. Your processor did not invent these rates and cannot change them for you, no matter how large your volume or how long you've been a customer.

This is an important point because some processors imply they have special access to lower base costs. They don't. What they may legitimately offer is a lower markup on top of interchange—which is real savings—but the interchange floor itself is fixed industry-wide.

What Determines Which Interchange Rate Applies

Not every transaction hits the same interchange category. The rate that applies depends on several factors:

• Card type: A basic debit card typically carries a lower interchange rate than a premium rewards credit card. The richer the rewards, the higher the interchange, because the issuing bank needs revenue to fund those perks.
• How the card is accepted: A card physically present and chip-read at the point of sale often qualifies for a lower rate than a card number typed in manually or processed in an e-commerce environment, because card-present transactions carry less fraud risk.
• Your industry: Certain business categories—nonprofits, utilities, supermarkets—may qualify for special interchange tiers. Your MCC (merchant category code) plays a role here.
• Data passed with the transaction: Sending complete transaction data, including things like order numbers for business-to-business payments, can help a transaction qualify for lower-cost interchange categories.

Where Your Processor's Markup Comes In

Your processor is in the business of facilitating transactions—connecting your terminal or software to the card networks, handling settlement, managing risk, and providing support. They charge for that service through a markup that sits on top of interchange.

That markup is where processors actually compete with each other, and it is the number you should scrutinize when comparing quotes. Common pricing structures include:

• Interchange-plus (cost-plus) pricing: You see the wholesale interchange rate as a line item, and the processor's markup is listed separately and explicitly. This is generally considered the most transparent model because you can see exactly what you're paying for each component.
• Flat-rate pricing: You pay one blended percentage on every transaction regardless of card type. Simple to understand, but you lose visibility into what portion is interchange and what portion is profit for the processor—and you may overpay on lower-cost transactions.
• Tiered pricing: Transactions are bucketed into qualified, mid-qualified, and non-qualified tiers at different rates. This model is the least transparent and often the least favorable for merchants, because the processor controls how transactions are bucketed.

Why This Matters for Your Bottom Line

When you understand that interchange is a fixed wholesale rate, you can have a much sharper conversation with any processor you're evaluating. Ask them to show you their markup separately from interchange. A processor who is confident in their pricing will do this readily.

You should also pay attention to whether your transactions are set up to qualify for the best possible interchange categories. Poor terminal configuration, missing transaction data, or the wrong card-acceptance method can cause transactions to "downgrade"—meaning they fall into a more expensive interchange tier than they should. That's money left on the table that has nothing to do with your processor's markup.

The Bottom Line

Interchange is the unavoidable wholesale cost baked into every card transaction in the US. It is set by the card networks, applied equally to every processor, and not something any vendor can waive or uniquely reduce. Your real opportunity to manage card processing cost lies in understanding the markup your processor charges on top of interchange, choosing a transparent pricing model, and making sure your transactions are set up to qualify for the most favorable interchange categories possible.

If you'd like a plain-English review of your current processing statement to see exactly what you're paying in interchange versus processor markup, reach out to our team for a free, no-obligation quote. We're happy to walk through the numbers with you.