Understanding interchange fees without the jargon
Interchange is the biggest slice of what you pay to take cards, and it's the slice nobody explains. Interchange fees are what the card-issuing bank collects every time a customer pays with its card, usually a percentage of the sale plus a fixed few cents. Your processor doesn't keep that money; the bank behind the card does.
Once you see how it works, your statement gets a lot less mysterious. So here it is, without the industry vocabulary lesson.
Who actually collects interchange?
Follow one sale. A customer buys $40 of groceries with a credit card. For the sake of easy math, pretend the interchange rate on that particular card is 1.5% plus ten cents; real rates vary, this is just to show the shape. That's 70 cents. It doesn't go to your processor and it doesn't go to the card network. It goes to the issuing bank, the bank that gave the customer the card.
The card networks set the interchange rates and publish the schedules, but they collect their own separate, smaller fees, called assessments. Your processor earns its money on top of both, through markup. So the fee line on your statement is really three layers: interchange to the issuing bank, assessments to the network, markup to the processor.
Why does interchange exist at all? It compensates the issuing bank for fronting the money instantly, taking the fraud risk, and running the card program. You can think it's too high, plenty of store owners do, but it isn't arbitrary.
Why is the rate different from card to card?
Because the card itself sets the category. A basic debit card generally carries lower interchange than a credit card. A premium rewards card carries more than a plain one. Business cards run higher still. Those airline miles your customer is earning are funded partly from fees on the store side of the counter, which is worth remembering next time someone taps a shiny metal card for a bag of chips.
How the card is taken matters too. A card that's tapped or dipped in person generally costs less than a number typed in by hand, because in-person transactions carry less fraud risk. Same customer, same card, different rate.
Can you negotiate interchange?
No. The networks set the schedules, and they don't take calls from corner stores or from giant processors on your behalf. Anyone who claims they'll get you a special interchange rate is either confused or hoping you are.
What you can negotiate is everything stacked on top: the processor's markup, monthly fees, and which pricing model you're on. That's where quotes genuinely differ, and it's the honest reason to shop around.
What can a store owner actually control?
More than you'd think. Take cards in person with a tap or a dip whenever possible, and save hand-keyed entry for the rare card that won't read; keyed transactions tend to clear at higher rates. Close your batch daily, since stale transactions can settle at worse rates. Pick a pricing model you can actually audit, so the markup stays visible.
And know your alternatives. A cash discount program, where posted prices reflect card costs and cash payers get a discount at the register, changes how the whole equation lands on your margin. NRS Pay offers plans built around that model, and the NRS Pay team can walk through whether it fits your store.
Frequently asked questions
Do debit cards have lower interchange fees than credit cards?
Generally yes. Debit transactions tend to carry lower interchange than credit, and rewards or business credit cards tend to sit at the higher end. The exact rate depends on the card and how it's accepted, which is why identical sale amounts can cost you slightly different fees.
Is interchange the same no matter which processor I use?
Yes. Interchange rates are set by the card networks and apply industry-wide, so no processor pays a different base cost than another. What differs between processors is the markup, the monthly fees, and the pricing model. That's the part worth comparing when you look at quotes.
Does the customer or the store pay the interchange fee?
The store does, as part of its processing costs. The customer pays the posted price and their bank collects interchange from the transaction flow. Some stores offset card costs through a cash discount program, where cash payers receive a discount at the register and posted prices reflect card acceptance.
If you want to see how the math shapes up for your counter, NRS Pay will lay it out in plain numbers.