How payment processing fees actually work

If your processing statement feels deliberately confusing, that's because, in a sense, it is. But underneath the jargon, every card payment you accept is built from the same three cost layers. Once you can name them, you can see exactly where your money goes - and which part is worth fighting over.

The three layers of every transaction

When a customer pays with a card, your processing fee is made up of interchange, assessments, and your processor's markup. Two of those are fixed for everyone. One is not.

1. Interchange - paid to the customer's bank

Interchange is the largest piece. It's set by the card networks (Visa, Mastercard, Discover) and paid to the bank that issued your customer's card. It typically runs somewhere around 1.5%–2.5% plus a small per-transaction fee, but the exact rate depends on several things:

• Card type - a basic debit card carries far lower interchange than a premium travel-rewards card.
• How the card is accepted - a physically tapped or inserted card ("card-present") is cheaper than a manually keyed or online payment ("card-not-present"), because the fraud risk is lower.
• Your business type - the networks publish different interchange categories for different industries.

Crucially, interchange is the same no matter which processor you use. Nobody can give you a "discount" on interchange - it's a pass-through cost.

2. Assessments - paid to the card networks

Assessments are the networks' own cut for running the rails your payment travels on. They're small - usually around 0.13%–0.15% - and, like interchange, they're the same for every merchant and every processor. Also non-negotiable.

3. Processor markup - the part you actually control

This is what your processor keeps for moving the money and providing your account, hardware, and support. It's the only layer that's genuinely negotiable, and it's where good and bad deals are made. Two businesses with identical sales can pay wildly different markups depending on how their pricing is structured and how closely anyone is watching.

Why "2.9%" doesn't tell you much

A headline rate like 2.9% + 30¢ bundles all three layers into one number, which hides how much of it is markup. A processor can advertise a friendly-sounding rate while burying a fat margin inside it - or add "junk" line items elsewhere on the statement that don't show up in the headline rate at all. The only way to know if you have a good deal is to separate the pass-through costs from the markup.

How to tell if you're overpaying

• Find your effective rate. Divide your total fees for the month by your total card sales. That single percentage cuts through every pricing trick.
• Look for tiered pricing. If your statement groups transactions into "qualified," "mid-qualified," and "non-qualified" buckets, you're almost certainly paying more than you need to.
• Hunt for flat monthly charges. PCI fees, statement fees, "regulatory" fees, and batch fees add up and are often pure padding.

Want the shortcut? Our effective rate calculator works it out in seconds, our guide to reading your merchant statement walks through exactly where these numbers live, and our breakdown of pricing models shows which structures keep the markup honest.

Once you know your number, two questions follow: is it normal, and what can you do about it? See what businesses actually pay in 2026 for the benchmarks, and how to lower your processing fees for the eight steps that reduce it.