Merchant statements might be the most confusing documents in small business. Some of that is genuine complexity — interchange really does have hundreds of rate categories. But some of it is by design: a statement that's hard to read is a statement nobody questions.
You don't need to become a payments expert. You need about ten minutes, a calculator, and a short list of what to look for. Here's the walkthrough.
Start with one number: your effective rate
Ignore every advertised rate and calculate what you're actually paying. Take the total fees for the month — every fee, not just the processing charges — and divide by your total card volume. That's your effective rate.
For most small businesses, a healthy effective rate lands somewhere between 2.2% and 2.8% depending on your industry and how you accept cards. If you're above 3.5%, something on your statement deserves a closer look. If you're above 4%, you're almost certainly overpaying.
Know which pricing model you're on
Statements read differently depending on your pricing model, so identify yours first:
Interchange-plus
Fees are broken out as interchange (what the card networks charge) plus a stated markup. This is the most transparent model — you can see exactly what your processor keeps.
Tiered pricing
Transactions get sorted into buckets like "qualified," "mid-qualified," and "non-qualified." Watch how many transactions land in the expensive tiers — processors control the sorting, and it rarely favors you.
Flat rate
One rate for everything. Simple, but you pay the same on a low-cost debit card as on a premium rewards card — and at meaningful volume, that simplicity gets expensive.
The fees worth circling in red
Once you know your model, scan the fee section for these common margin-eaters:
Padded interchange
On some statements, the line labeled "interchange" quietly includes a markup above the true network cost. If your "interchange" rates don't match the published Visa and Mastercard tables, that gap is your processor's margin in disguise.
PCI non-compliance fees
Often $30–$100 per month for doing nothing. Completing your annual PCI questionnaire usually makes this fee disappear — and some processors don't go out of their way to tell you that.
Monthly junk fees
Statement fees, batch fees, "regulatory" fees, annual fees split into monthly installments. Individually small, collectively hundreds of dollars a year for nothing.
Surprise rate increases
Processors can raise markups with a fine-print notice on the statement itself. Compare your effective rate to three months ago — if it drifted up and your card mix didn't change, you got a quiet increase.
What to do with what you find
If your statement checks out, great — you're in the minority, and now you know how to keep verifying it. If it doesn't, you have two options: call your processor and negotiate (they'll often trim fees the moment you show you're paying attention), or get a competing review and let the numbers decide.
If you're a B2B business, there's often an extra layer of savings hiding in how your transactions are submitted — see our guide to Level 3 processing.
Want a second set of eyes? Send us a recent statement and we'll walk through it with you line by line — what's fair, what's padded, and what you'd save. No pressure, no jargon. Or call 718-702-0186.