Credit card processing fees for small business

What do credit card processing fees for small business actually cover?

Three parties get paid on every card sale, and your statement bundles them. The card-issuing bank takes interchange, the card network takes an assessment, and the processor takes its own margin plus whatever fixed fees the agreement carries.

Interchange is the largest of the three and it is set by the card networks, not by your processor. It varies by card type, by whether the card was present, and by how the transaction was entered. Nobody can discount interchange for you, and any pitch that implies otherwise is describing something else.

What is the difference between interchange plus and flat rate?

You pay a merchant discount to your processor or bank. That discount can include interchange, network assessments and the processor's markup. Interchange plus shows the wholesale transfer and the markup as separate lines. Flat rate bundles the blend into one percentage, which is simpler to predict and often more expensive once volume and card mix drift from the blend.

• Interchange plus: more transparent, generally better at volume, harder to read on a statement
• Flat rate: predictable, easy to budget, pays a premium for that simplicity
• Tiered: transactions sorted into qualified, mid and non-qualified buckets. The tiers are defined by the processor, which is what makes it the hardest to compare

Whichever you are on, the comparison that survives is your effective rate. Use the processing fee calculator actual-statement mode: total processing fees divided by that month’s card sales. Example: $1,040 in fees on $40,000 in card sales is a 2.60% effective rate. The quote estimator on that page is a separate tool and does not replace the statement math.

Which fees are not the rate?

• Per-transaction fee, a fixed amount on every sale. On a small basket this is a bigger share of the cost than the percentage
• Monthly statement fee
• Monthly minimum, charged when your processing does not generate enough in fees
• PCI compliance fee, and a separate non-compliance fee if a questionnaire lapses
• Batch fee, charged each time you settle
• Gateway fee, if you take card-not-present payments
• Chargeback fee, which may be charged when a dispute is opened; the agreement controls whether it is returned if you win
• Annual fees, which look small until you divide them by twelve and add them in

A quote that names only a percentage has not told you what you will pay. Ask for every line in writing before signing anything.

What is a downgrade, and why does it cost me?

A downgrade is a transaction that does not qualify for the rate you expected and gets billed at a higher one. The common causes are keyed entry rather than a dip or tap, a missing address verification on a card-not-present sale, and certain corporate or rewards cards that carry higher interchange.

Downgrades can help explain why a store’s effective rate is above the quoted one, alongside card mix and fixed fees. Reducing avoidable downgrades is mostly operational: take the card physically where you can, capture address data where appropriate, and settle on the schedule your agreement requires.

How does POS credit card processing bundle into all this?

Often the register and the processing are sold together, and sometimes the hardware is cheap or free because the cost has moved into the rate. That can still be good value, but it is a different deal from the one it appears to be.

Separate the four costs before you compare anything: hardware, software, processing and support. Our POS system cost page breaks those out, and if you would rather pass the fee to the customer instead of absorbing it, that is a separate decision covered on our cash discount and dual pricing page.

How do I tell if I am overpaying?

1. Take one full month’s statement, not an average of several.
2. Add every charge on it, percentage lines and fixed lines together.
3. Divide by the total card volume for that month and multiply by a hundred. That is your effective rate.
4. Ask any processor you are considering for a full written schedule, and run the same arithmetic on it.
5. Compare the two, then compare contract terms and what leaving costs.

Most stores have never done step three. If you want a second read, send us the statement and we will go through it with you.

For a like-for-like quote comparison, Square's US fees page (retrieved 2026-09-11 from squareup.com/us/en/payments/our-fees) lists tap/dip/swipe at 2.6% + 15¢, 2.5% + 15¢ or 2.4% + 15¢ by plan. Our published in-person rate is 2.50% + $0.10. Sample pricing applies to new accounts applying directly; pricing is subject to underwriting, MCC and the merchant agreement; rates may differ and are subject to change. Type both schedules into the fee calculator on the same volume and ticket count. Do not pick a winner from a headline percentage.

How do I read a merchant processing statement?

1. Confirm the business name, merchant ID and statement period so you are reading the right account and month.
2. Find total card sales, refunds, chargebacks and net deposits. Do not treat net deposits as the fee total.
3. Identify the pricing model: flat rate, interchange plus or tiered.
4. If fees are withheld daily, add those amounts to the fees charged at month end.
5. Total every processing and account fee, then divide that total by card sales in the calculator’s actual-statement mode.
6. Compare the same channels and a similar card mix month to month, and flag any fee or policy change you cannot explain.

Use your own agreement and statement labels as the controlling documents. Field names differ by processor, so match each line to the schedule you signed rather than to a third-party explainer.