Interchange Explained: What It Is and Why It Determines Your Rates

Here is something that surprises most business owners: the rate your processor charges you is not a single thing. It is actually two things bundled together—a cost the processor pays to the card networks called interchange, and a markup the processor adds on top of that. Most pricing conversations focus entirely on the second part while leaving the first completely unexplained. That is a problem, because interchange is where the majority of your credit card rates live.

Understanding interchange is not just an academic exercise. It determines whether you can evaluate a competing processor’s quote, understand why different card types cost different amounts to accept, and make smarter decisions about your pricing structure. Once you get it, everything about payment processing costs makes more sense.

What Interchange Actually Is

Interchange fees are set by the card networks—Visa, Mastercard, American Express, and Discover—and they represent a per-transaction fee paid by your acquiring processor to the card-issuing bank whenever a customer uses their card at your business. The issuing bank (the bank that gave the customer their credit card) receives this fee as compensation for the risk of extending credit and for funding the rewards programs attached to those cards.

Neither you nor your processor sets interchange rates. They are published by the card networks and revised twice a year, typically in April and October. Visa alone publishes hundreds of interchange categories, each with its own rate. The category that applies to any given transaction depends on several variables: the type of card used, the industry your business is in, how the transaction was processed, and what data accompanied it.

Why Interchange Varies So Much

Two customers can walk into your store on the same day, buy the same item for the same price, and you will pay different interchange fees to accept their cards. This happens because the card type matters enormously.

A basic Visa debit card, processed with a PIN, carries some of the lowest interchange rates available—often under 0.5% plus a small fixed fee. A premium travel rewards credit card from the same network might carry interchange of 2.0% or higher. The difference reflects the economics of the rewards program: the more valuable the rewards, the more expensive the card is to accept.

Transaction type affects interchange too. A card physically swiped, dipped, or tapped at a terminal carries lower interchange than a card number manually keyed in. Why? Fraud risk. Card-present transactions have lower fraud rates, so the networks price them more favorably. This is one reason businesses with high card-not-present volume, like e-commerce or phone order operations, see higher effective rates than in-person retailers.

Your industry matters as well. Certain merchant category codes carry preferential interchange rates—nonprofits, utilities, and government agencies often see reduced rates as a matter of card network policy.

The Difference Between Interchange-Plus and Tiered Pricing

This is where merchant services pricing gets either transparent or murky, depending on how your processor chooses to bill you.

Under interchange-plus pricing, your processor passes through the actual interchange cost and adds a fixed markup—expressed as a percentage plus a per-transaction fee. A typical markup might be 0.20% + $0.10 per transaction. Your statement shows these two components separately, so you can see exactly what the card networks charged and exactly what your processor added. This model rewards you when interchange is low (on debit cards or simple purchases) and costs more only when interchange is genuinely higher.

Under tiered pricing, your processor assigns every transaction to one of three buckets—qualified, mid-qualified, or non-qualified—at rates they define. The qualified rate is what gets advertised. The problem is that the majority of real-world transactions often land in higher tiers because of card type or transaction method, and the statement tells you almost nothing about why. Tiered pricing can obscure a significant markup because the processor’s profit is baked into the tier structure rather than shown as a separate line.

For most businesses, interchange-plus pricing is more transparent and, over time, more cost-effective—assuming the markup itself is reasonable.

What Merchants Can and Cannot Control

You cannot change interchange rates. They are non-negotiable, set by networks, and identical for every processor. What you can control is how you process transactions and who you pay a markup to.

Swiping, dipping, or tapping a card at a terminal rather than manually entering a number keeps interchange in the lower card-present category. Ensuring your terminal is set up correctly so that all required transaction data passes to the networks—address verification, card security codes, industry-specific fields—prevents expensive interchange downgrades. Choosing a pricing model where the markup is transparent makes it possible to evaluate and negotiate fairly.

One merchant we worked with was processing most of their transactions as manually keyed entries because their staff found it easier. Moving to a terminal that captured the card chip reduced their average interchange by over 0.4%. On their volume, that was a meaningful number.

How to Use This Knowledge When Evaluating Processors

When a processor quotes you a rate, ask whether it is interchange-plus or tiered, and what the markup component is. On interchange-plus, a competitive markup for a typical small business is roughly 0.15%–0.30% plus $0.05–0.15 per transaction. Anything significantly higher deserves scrutiny. On tiered pricing, ask what percentage of your transactions have historically landed in the qualified tier—a question most processors will be uncomfortable answering honestly.

Comparing processors on the basis of their stated rate alone is meaningless without knowing the pricing model. Two processors quoting the same percentage number might have very different effective costs depending on how interchange is handled.

The Bottom Line

Interchange is the floor of your payment processing costs—the amount that flows to the card networks regardless of which processor you choose. Your processor’s markup sits on top of that floor, and it is the only part of your rate that is actually negotiable. Understanding the difference between the two puts you in a position to evaluate quotes accurately, ask better questions, and make sure the markup you’re paying reflects the value you’re receiving.