Interchange vs markup fees: what each charge is and who actually pays it

When a customer pays by card, the processing cost on your statement is almost never a single fee. It is the sum of at least two distinct charges: an interchange fee collected by the card-issuing bank, and a markup kept by the payment processor that handles the transaction. Most billing statements present the combined total as a single processing rate, which is why merchants often pay more than they realize — or pay for the wrong pricing model for their business type.

Understanding the difference matters because these two fees follow different rules. Interchange is set by the card networks and flows to the issuing bank; it is largely outside anyone’s direct control. The markup is what your processor charges on top, and it is the only part that is genuinely negotiable. Knowing which is which is the starting point for any meaningful cost comparison.

What this fee is

The confusion starts with how most processors present costs. A quoted rate of “2.9% per transaction” typically contains two economically different things bundled together.

Interchange is the fee that flows from your payment processor to the bank that issued the customer’s card. It is set by the card network (Visa, Mastercard, and others) and varies by card type, how the transaction was completed, and your merchant category. The issuing bank receives this fee as compensation for extending credit and managing fraud risk on the cardholder’s side. You never pay the issuing bank directly — your processor does, then passes the cost to you.

The markup — also called the processor margin, discount rate spread, or service fee depending on the provider — is what the processor charges on top of interchange for authorization, settlement, fraud screening, and their own profit. This is the only part of the combined rate that is actually negotiable.

The term “discount rate”, still used by many processors, is particularly misleading. It is not a discount you receive. It is the percentage the processor deducts from your revenue on every transaction.

How it is calculated

• Interchange is set by the card network, not by your processor, and applied as a percentage of the transaction amount plus a small flat per-transaction fee in most card schemes.
• The interchange rate depends on the card type (basic debit, standard consumer credit, premium rewards, corporate), whether the card was physically present at the point of sale, your merchant category code (MCC), and in some markets the transaction size.
• Consumer credit card interchange in the United States has historically ranged from roughly 1% to over 3% depending on card type; basic consumer debit interchange is generally lower and may be subject to a regulatory cap for large bank issuers.
• In the European Economic Area, EU regulation caps consumer credit card interchange at 0.3% of the transaction and consumer debit at 0.2%; similar caps exist in the United Kingdom and Australia. No equivalent federal credit card cap exists in the United States.
• Commercial and corporate cards typically carry higher interchange than consumer cards in most markets.
• The markup your processor charges sits on top of interchange; its structure depends entirely on your pricing model.
• On interchange-plus contracts, the markup is a separate, visible line — a percentage plus a flat per-transaction fee — both of which can be negotiated.
• On flat-rate contracts, interchange is bundled into one combined rate; you never see the interchange cost broken out, and the processor keeps the spread between the actual interchange cost and the flat rate you pay.
• On tiered contracts, the processor sorts transactions into buckets (commonly “qualified,” “mid-qualified,” and “non-qualified”) with a different rate for each; the processor decides which bucket applies to each transaction.
• Card networks publish their interchange schedules publicly and update them periodically; these schedules — not your processor’s sales materials — are the authoritative source for base rates.

When you get charged

• Every completed card transaction triggers both an interchange fee and the processor markup simultaneously.
• Card-present transactions (chip, contactless tap, or magnetic swipe) trigger interchange at the standard card-present rate, which is generally the lowest tier available.
• Card-not-present transactions (online checkout, phone orders, or manually keyed card numbers) trigger a higher interchange rate because the statistical fraud risk is higher.
• The card the customer presents determines the interchange rate — a premium rewards card or corporate card costs more to accept than a basic consumer debit card, and you have no control over which card the customer chooses.
• A transaction that is missing required data fields, settled more than a set number of days after authorization, or coded with an incorrect MCC may be downgraded to a higher interchange tier without any alert on your statement.
• On tiered contracts, the processor’s own rules determine the bucket; a transaction can land in “non-qualified” — the most expensive tier — for reasons that are not disclosed line by line.
• The markup applies on every settled transaction; on some contracts, it also applies to refunds.
• If your monthly processing volume falls below a minimum threshold set in the contract, a monthly minimum fee applies — this is a fixed charge that exists independently of per-transaction costs.
• Chargebacks do not trigger a second interchange charge, but most processors apply a separate chargeback fee per disputed transaction, regardless of outcome.

Can you avoid it

Interchange cannot be avoided as long as you accept card payments. Reduction is possible but limited:

• Switching to interchange-plus pricing makes the interchange cost visible; it does not lower the network rate, but it lets you verify you are being charged the actual published rate rather than an opaque bundled equivalent.
• Routing customers to card-present transactions (chip or tap) rather than card-not-present lowers the blended interchange cost, because card-present rates are lower.
• Ensuring your terminal or checkout collects all required data fields (billing address for AVS, CVV, correct MCC) reduces the risk of transaction downgrades to more expensive interchange tiers.
• Where surcharging is legally permitted, passing the card fee to the customer eliminates the interchange cost for the merchant; rules vary significantly by country and, in the United States, by state — confirm local law and card network rules before implementing.
• Cash discounting — offering a lower price for cash payment — achieves a similar result and is subject to its own set of local rules.
• Negotiating lower interchange directly with card networks is generally not available to small or mid-sized merchants; it requires very large transaction volumes and a direct commercial relationship with the network.

The markup is negotiable, and the structure of your contract determines how much leverage you have:

• On interchange-plus contracts, the markup percentage and the flat per-transaction fee are the two figures to negotiate; volume and competitive quotes from other processors are the main levers.
• Moving from tiered to interchange-plus pricing is often the single most impactful change a mid-volume merchant can make, because tiered pricing routinely routes low-cost transactions into higher-priced buckets.
• Flat-rate contracts rarely allow rate negotiation; the processor’s margin expands when it processes low-interchange cards (basic debit) and compresses on high-interchange cards (premium rewards).
• Monthly fees listed separately from per-transaction costs — platform fees, PCI compliance fees, statement fees, batch fees — are often waivable on request or absent on competing contracts; itemize them before signing.

What it really costs over a year

The following is an illustrative example only — it does not represent any quoted or current rate. Use it as a framework to run the same calculation on your own figures.

Example: a retail business processing $500,000 per year, average transaction value $60, card-present, predominantly consumer credit cards.

At $500,000 annual volume, that is approximately 8,333 transactions per year.

The spread between the best and worst outcomes in this example exceeds $6,000 per year on $500,000 of volume — a difference that is invisible if you only compare headline percentages.

At $500,000 annual volume, a 0.3% difference in total cost equals $1,500 per year. At $2,000,000 annual volume, the same 0.3% difference equals $6,000 per year. The higher your volume, the more the pricing model — not the headline rate — determines your actual cost.

To compare two processors on the same basis, ask each one to run your last three months of actual transactions through their pricing model and show you the total charge broken out between interchange and markup.

What to check before you commit

• Ask the processor: “What is your markup above interchange, and is it the same rate for all card types?” A processor who cannot give a direct answer is likely quoting a tiered model where the margin is deliberately opaque.
• Ask: “What fees are charged in addition to interchange and your markup?” Request a written list and look specifically for monthly platform fees, PCI compliance fees, batch fees, statement fees, and chargeback fees.
• Ask: “Which pricing model does this contract use — flat-rate, interchange-plus, or tiered?” Confirm the answer in the signed contract, not just the sales summary, and verify it matches the attached fee schedule.
• Ask: “How will I be notified of fee changes, and what is the notice period?” Most processors reserve the right to change fees with 30 days’ notice; confirm this in the contract and note any early termination fee that would apply if you switch.
• Check the card networks’ publicly published interchange schedules — Visa and Mastercard post these on their own websites and update them periodically — to verify the base rates your processor is passing through.

Fees change frequently. The processor’s current fee schedule — not a sales quote or website summary — is the document that governs what you pay. If a rate was quoted verbally or in a promotional summary, ask for it to appear in the signed contract.

Frequently asked questions

Is interchange the same as a processing fee? No. Interchange is one component of the total processing cost — specifically the portion paid to the card-issuing bank. A processing fee is the combined charge from your processor, which includes interchange plus the processor’s own markup. The two terms are often used interchangeably in sales conversations, which is a significant source of confusion.

Why was I charged a higher rate on some transactions than others? Most likely because of card type or transaction method. Premium rewards cards, corporate cards, and card-not-present transactions all carry higher interchange than a basic consumer debit card used in person. On a tiered contract, some transactions may also have been “downgraded” to a more expensive bucket — this can happen without any clear explanation appearing on the statement.

Can I negotiate interchange directly with Visa or Mastercard? Generally no, not for small or mid-sized merchants. Interchange rates are set by the card networks and applied uniformly by all processors. What you negotiate is the markup your processor charges above interchange. Very large-volume merchants may apply for custom rates directly with networks in some markets, but this is not a realistic option for most businesses.

Does accepting American Express cost more than Visa or Mastercard? Amex historically operated a closed-loop network with its own fee structure, separate from Visa and Mastercard interchange. In many markets, Amex has since moved to a model where its cards are processed through the standard acquiring infrastructure. Rates may still differ from Visa and Mastercard consumer card rates. Check the specific terms in your processor agreement rather than assuming parity.

If I refund a transaction, do I get the interchange back? Not necessarily. In many cases the interchange on the original transaction is not fully returned when a refund is issued — some networks return a portion, some return none. This means a full refund still has a net cost to the merchant. Check your processor’s specific refund policy; this detail is often buried in the fee schedule rather than disclosed upfront.

A note on rates and when to ask a professional

Processing fee schedules — both the interchange tables published by card networks and the markup schedules set by processors — change frequently. The rates described in this article are ranges and orders of magnitude for illustration only; they are not current quoted rates and will age. Before making any pricing decision, verify rates against the card network’s own published interchange schedule and the specific fee schedule attached to your processor contract.

If processing costs represent a material line item and you are evaluating them as part of a broader business restructuring, the calculation may have implications for deductible expenses. In that case, consult a qualified accountant or tax professional rather than relying on illustrative figures in a general article.