Credit Card Processing Fees, Explained: Where That 3% Goes

Every time a customer pays by card, a slice of the sale never reaches your bank account. For most small businesses that slice runs from 1.5% to 3.5% of each transaction, plus a small fixed fee of roughly 10 to 30 cents. On $10,000 of monthly card sales, that is $150 to $350 a month — $1,800 to $4,200 a year — disappearing into a fee structure most owners never see itemised.

The frustration is that the fee is not one number. It is three different charges, set by three different parties, bundled onto one statement. Two of the three are fixed and identical for every merchant in the country. Only the third can be negotiated — and it is the one processors work hardest to hide. Once you can read the three layers, you can work out whether your rate is fair, and exactly what to ask for when you renegotiate.

The short answer: interchange goes to the customer’s bank and runs about 1.15% to 3.15% depending on the card; assessment fees go to the card network and run about 0.13% to 0.15%; the processor’s markup is the only negotiable layer and typically runs 0.15% to 0.50% on a transparent plan. The average effective swipe fee across Visa and Mastercard was 2.36% in 2025.

The Three Layers of Every Fee

Think of every card payment as a payment split three ways. The customer pays $100. The card network moves the money. The issuing bank, the network, and your processor each take a cut before the rest lands in your account, usually one to two business days later.

1. Interchange — the bank’s cut, and the biggest one

Interchange is the fee paid to the bank that issued your customer’s card — Chase, Bank of America, Capital One, or a credit union. It is set by Visa and Mastercard, published twice a year, and it is not negotiable. Every processor in the country pays the same interchange on the same card, so a processor that claims it can lower your interchange is selling you something it cannot deliver.

Interchange is also the largest layer, roughly 75% to 85% of your total processing cost. The rate depends on the card and how it was accepted. A basic debit card swiped in person can cost as little as 0.05% plus 21 cents, because debit interchange for large banks is capped by the Durbin Amendment. A standard consumer credit card tapped in person runs about 1.15% to 1.95% plus 10 cents. A premium rewards card — the kind that gives the customer cash back or airline miles — runs 1.95% to 2.60% plus 10 cents, because the bank funds those rewards from interchange. A transaction that falls back to the standard rate, for example a card keyed in by hand with no address check, can reach 3.15% plus 10 cents.

That spread is why two businesses with the same processor can pay very different effective rates. A corner shop whose customers mostly tap debit cards pays far less than a jeweller whose customers mostly use premium rewards cards, even on identical pricing plans.

2. Assessment fees — the network’s cut

Assessment fees go to Visa, Mastercard, Discover, or American Express for running the rails. They are small, fixed, and the same for every merchant. In 2026 Visa charges roughly 0.14% of credit volume and Mastercard about 0.1375%, each with a small flat per-transaction fee layered on top. On a $100 sale, the assessment is about 14 cents.

There is nothing to negotiate here either, and nothing to compare between processors. If a quote shows a lower assessment fee than these figures, the difference is being recovered somewhere else on the statement.

3. Processor markup — the only negotiable layer

The markup is what your processor — Square, Stripe, Fiserv, or an independent merchant services provider — charges to move the transaction and deposit your money. It is the only part of the bill that is actually negotiable, and it is also the part processors work hardest to hide inside flat rates and tiered pricing.

On transparent interchange-plus pricing, a typical small business markup in 2026 is 0.15% to 0.50% plus a per-transaction fee of 7 to 15 cents. On flat-rate pricing the markup is baked into the headline percentage, which is why a flat 2.6% in-person rate can hide a markup of 0.2% or 0.8% depending on the cards your customers use. You cannot tell from the headline rate alone.

A Worked Example: Where $100 Actually Goes

Take a $100 sale paid with a standard consumer credit card, tapped in person, on an interchange-plus plan with a 0.30% plus 10-cent markup:

• Interchange: 1.80% + $0.10 = $1.90
• Assessment (Visa): 0.14% = $0.14
• Processor markup: 0.30% + $0.10 = $0.40
• Total fee: $2.44. You keep $97.56.

Now the same $100 sale paid with a premium rewards card online, on a flat-rate plan at 2.9% + 30 cents:

• Total fee: $3.20. You keep $96.80.

And the same $100 paid with a debit card in person:

• Interchange (regulated debit): 0.05% + $0.21 = $0.26
• Assessment: $0.14
• Markup: $0.40
• Total fee: $0.80. You keep $99.20.

Three ways of taking the same $100, and the fee ranges from 80 cents to $3.20. The card your customer uses and how they present it matters more than which processor you chose.

The Four Pricing Models

Processors sell the same three layers in four different wrappers. The wrapper decides how much of your bill you can actually see.

Flat rate. One percentage plus one fixed fee for every transaction, regardless of card type. Square charges 2.6% + 15 cents in person and 3.3% + 30 cents online on its free plan; Stripe charges 2.9% + 30 cents online. Flat rate is simple, predictable, and the right choice for most businesses under about $10,000 to $15,000 a month in card volume, because the simplicity is worth more than the small saving a transparent plan would give. Above that volume, flat rate is usually the most expensive option.

Interchange-plus. You pay the true interchange and assessment for each card, plus a fixed markup that is spelled out on your statement. A typical small business deal in 2026 is interchange + 0.25% to 0.40% + $0.05 to $0.15 per transaction. This is the most transparent model and almost always the cheapest once you pass roughly $10,000 to $15,000 a month in volume, because you keep the savings on every debit and basic credit card instead of paying the flat rate on all of them. The trade-off is a statement that takes ten minutes to read.

Tiered pricing. Transactions are sorted into qualified, mid-qualified, and non-qualified buckets, each with its own rate. This is the model to avoid. The qualified rate in the sales pitch is the cheapest possible card, and most of your real transactions land in the expensive buckets. Tiered pricing exists to make a quote look cheap, not to make your bill cheap.

Subscription or membership pricing. You pay a monthly membership fee — often $50 to $100 — plus interchange at cost with little or no markup. This works for high-volume businesses, typically $25,000 a month or more, where the membership fee is smaller than the markup it replaces. For a small shop it usually costs more than flat rate.

What Pushes Your Rate Up

Five things raise the fee on a given transaction, and four of them are under your control.

First, card-not-present transactions cost more. An online or phone order runs 2.9% to 3.5% plus 30 cents, against 2.5% to 2.7% plus 10 cents in person, because the fraud risk is higher and the interchange is higher. Second, keyed-in cards cost more than tapped or dipped ones — a manually entered card can add 0.5% to 1% to the interchange, which is why a terminal that cannot read a chip is expensive. Third, premium rewards and corporate cards carry the highest interchange in the system, up to 2.6% or more. Fourth, American Express is a separate network with its own, generally higher, rates.

Fifth, and most avoidable, is a badly chosen pricing model. A business doing $20,000 a month on flat rate at 2.9% is paying $580 a month. The same volume on interchange-plus at an all-in effective rate of 2.2% costs $440 — a $140-a-month difference, $1,680 a year, for changing nothing except the contract.

The Hidden Fees on Your Statement

The percentage is only part of the bill. Check your statement for these:

• Monthly account fee: $0 to $50 a month. Flat-rate processors usually charge nothing; traditional merchant accounts often charge $10 to $25.
• PCI compliance fee: $5 to $20 a month, or an annual $100 to $200 charge, for the security questionnaire card networks require. Some processors charge a monthly “non-compliance” fee instead, which is a penalty for not completing the questionnaire — completing it is free.
• Batch fee: 10 to 30 cents per daily batch settlement. Small, but it adds up to $7 to $9 a month.
• Gateway fee: $15 to $25 a month if you take payments through a separate online gateway.
• Chargeback fee: $15 to $25 per disputed transaction, charged even if you win the dispute.
• Early termination fee: $200 to $500 if you cancel a traditional merchant account early. Flat-rate processors have none.

If your statement has line items you cannot explain, ask your processor to name each one. A processor that cannot explain its own fees in plain language is a processor to leave.

How to Work Out Your Effective Rate

Forget the headline rate. The only number that matters is your effective rate: total fees divided by total card volume, times 100. Take last month’s statement, add up every fee on it — percentages, per-transaction charges, monthly fees, all of it — divide by the total card volume, and multiply by 100.

A fairly priced small business in 2026 lands between 2.2% and 3.1% all-in, depending on card mix. A debit-heavy retail shop should be near 1.5% to 2.2%. An online shop should be near 2.5% to 3.5%. If your effective rate is above 3.5%, you are overpaying unless almost every sale is a keyed-in premium card. If it is below 2%, check that nothing is being deferred to a monthly bill you are not counting.

How to Lower Your Processing Fees

Start with the statement, not with a sales call. Work out your effective rate, then work out your card mix: what share of your volume is debit, standard credit, and premium rewards. That tells you whether a different pricing model would actually help. A debit-heavy shop gains a lot from interchange-plus; a shop whose customers all use premium cards gains almost nothing, because the interchange is the same on every plan.

Second, get two interchange-plus quotes and make the processor compete on the markup only. The markup is the only number that differs between honest quotes, so ask for it in writing: “interchange plus X% plus Y cents, no other percentage fees.” A quote that will not state its markup in those terms is not a quote.

Third, fix the avoidable costs. Make sure your terminal reads chips and contactless payments, so cards are not keyed in. Settle batches daily. Complete the PCI questionnaire so the non-compliance fee disappears. For online sales, use address verification, which qualifies more transactions for lower interchange.

Fourth, consider passing the cost on — carefully. Surcharging, adding a fee to card payments, is legal in most states but not in Connecticut or Massachusetts, and card network rules cap it, currently at 3%, and require clear disclosure at the point of sale. Cash discounting — listing a cash price and a higher card price — is legal everywhere and achieves the same thing with less paperwork. Either way, tell customers before they pay, not on the receipt. A surprise fee costs more in lost customers than it saves in processing.

Finally, re-check once a year. Interchange rates are updated every April and October, a $38 billion Visa and Mastercard settlement preliminarily approved in June 2026 may gradually change some numbers over the next few years, and processors raise flat rates quietly — Square’s October 2025 repricing moved its online rate, and at least one small processor was still quoting the old 2.6% + 10-cent rate months after the change. Your rate is not a fixed cost. Treat it like rent: review it annually, and renegotiate when the numbers drift.

The Bottom Line

Credit card processing fees are not a mystery charge. They are three layers — interchange to the bank, assessment to the network, markup to the processor — and only the markup can be negotiated. Most small businesses pay 1.5% to 3.5% per transaction, and the difference between the top and bottom of that range is worth thousands a year. Work out your effective rate from your last statement, compare it with the 2.2% to 3.1% fair range, and if you are above it, get an interchange-plus quote. The cheapest processor is rarely the one with the lowest advertised rate. It is the one whose statement you can actually read.

If you use the most common flat-rate processor, see how much Square charges per transaction to compare its rates against the numbers below.

Frequently Asked Questions

What is the average credit card processing fee for a small business?
Most small businesses pay between 1.5% and 3.5% per transaction, plus 10 to 30 cents. The average effective swipe fee across Visa and Mastercard was 2.36% in 2025.

Can I negotiate credit card processing fees?
Only the processor markup. Interchange and assessment fees are set by the card networks and are identical for every merchant. Negotiate the markup down, or move to interchange-plus pricing where the markup is stated separately.

Is Square or Stripe cheaper than interchange-plus?
For businesses under about $10,000 to $15,000 a month in card volume, flat-rate processors are usually competitive and simpler. Above that volume, interchange-plus is usually cheaper, often by 0.5% to 0.7% of volume.

Why did my processing fee go up this month?
Usually the card mix changed — more premium rewards cards, more online or keyed-in transactions — or the processor raised a rate. Check your effective rate against the previous month before assuming the processor changed anything.

Do I pay fees on refunds?
Most processors refund the interchange when you refund a sale, but keep their markup and the per-transaction fee. Some flat-rate processors keep the full percentage. Check your agreement before refunding large orders.