Understanding Interchange Fees Without the Confusion
f you have ever looked at your merchant statement and felt like interchange was written in another language, you are not alone. It is one of the most misunderstood parts of payment processing, yet it is also the largest portion of what most businesses pay when they accept cards.
Let’s simplify it.
Interchange is a fee that goes to the bank that issued your customer’s card. Not your processor. Not your POS company. The customer’s bank. When someone pays you with a credit or debit card, their bank is either extending credit or releasing funds on their behalf. Interchange compensates that bank for the risk, fraud protection, infrastructure, and cardholder benefits tied to that transaction.
Your processor does not create interchange rates. The card networks publish them, and every processor in the country pays the same base interchange costs.
So why does it feel like rates are all over the place?
Because interchange is not one number. It changes depending on the card used and how the transaction is processed.
For example, a basic debit card usually has a much lower interchange rate than a premium rewards credit card. Rewards cards fund airline miles, cash back, hotel points, and other perks. Those benefits are not free. Part of the funding comes from interchange. So when a customer pulls out a high end travel card, that transaction typically costs more than if they used a standard debit card.
How the card is run also matters. When a card is tapped or inserted in person, it is considered lower risk. The chip technology reduces fraud. Lower risk usually means lower interchange. When a card is keyed in manually or processed online, it is considered higher risk because fraud is more likely in card not present environments. Higher risk transactions generally carry higher interchange rates.
You can see how this creates variation. You might process two transactions for the exact same dollar amount, yet they cost you different amounts in fees simply because the customer used a different type of card or payment method.
Now let’s talk about how this shows up in your pricing model.
With interchange plus pricing, you pay the true interchange cost for each transaction, plus a fixed markup from your processor. For example, if interchange is 1.80 percent on a transaction and your processor charges 0.30 percent on top, you pay 2.10 percent plus any per transaction fee. If interchange on another transaction is 0.80 percent, you pay 0.80 percent plus the same 0.30 percent markup.
The advantage here is transparency. You can see what the actual cost of the card was and what your processor is earning. Your overall rate may change month to month depending on your card mix, but the structure is clear.
Flat rate pricing works differently. Instead of passing through the actual interchange cost, the provider charges one blended rate for everything. You might pay 2.6 percent plus 10 cents no matter what type of card is used. That makes statements simple and predictable, but it also means that when a low cost debit card is used, you may be paying more than the underlying interchange would have required. The provider builds in enough margin to cover higher cost transactions and still protect their revenue.
Neither model is automatically right or wrong. It depends on your volume, average ticket size, and customer card mix. The key difference is transparency. Interchange plus shows you the wholesale cost and the markup. Flat rate hides the moving parts in exchange for simplicity.
When business owners feel confused about interchange, it is usually because no one has explained that there are multiple entities getting paid in every transaction. The issuing bank receives interchange. The card network collects assessment fees. The processor earns its markup. Once you understand that structure, the statement starts to make more sense.
Interchange is not a mystery fee. It is the foundational cost of participating in the card network system. The more you understand how it works, the better questions you can ask, and the more confident you can be that your pricing structure actually fits your business.
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