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Credit card processing fees are the merchant’s cost of accepting a card payment. Your processor may show one bundled rate or several statement lines. The total commonly reflects interchange paid through the card networks, network assessment fees, and the processor or acquirer’s own markup, with possible account, batch, PCI-compliance, or chargeback charges added under the contract.
This guide is U.S.-focused and written for merchants reviewing statements or comparing offers. It explains who receives each charge, why online and in-person prices differ, how to compare quotes using your actual transaction mix, and what to check before adding a surcharge.
What does a credit card processing fee include?
A merchant pays its acquiring bank or payment provider under a merchant agreement. That price is often called the merchant discount rate (MDR). Mastercard describes interchange as one component of the MDR, while Visa distinguishes the interchange transfer between banks from the merchant discount paid to the merchant’s financial institution. Square’s educational overview similarly describes an MDR as combining interchange, network assessment fees, and payment-service-provider fees.
The same underlying costs can therefore appear in very different formats. A flat-rate provider might show one percentage plus a fixed cents amount. An interchange-plus contract may list network costs and a separate markup. Neither statement layout, by itself, tells you whether the offer is inexpensive; you have to calculate the total for your business.
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Interchange
Interchange is generally a transfer from the acquiring side to the card-issuing bank for a purchase. The card network establishes interchange categories and qualification rules. A merchant usually does not negotiate this component directly with the issuer. Card product, transaction details, and data quality determine which category applies.
Assessment, dues, and other network fees
Assessment or network fees are charges associated with using a card network. They are conceptually separate from issuer interchange, although a provider can combine them in a flat rate or pass them through as line items. The name and presentation vary by agreement.
Processor or acquirer markup
The processor, acquirer, or payment-service provider charges for authorizing, routing, settling, and supporting transactions. Its markup may be a percentage, a per-transaction amount, a monthly subscription, or a combination. The contract determines whether it is visible as a separate line or included in a bundled price.
Additional statement charges
Depending on the provider and plan, a statement can also contain account, monthly, batch, PCI-compliance, or chargeback fees. These are not universal. Square lists them as examples of charges some providers may assess and notes that its own treatment differs. Match every line to your specific agreement rather than assuming that one provider’s list applies to all processors.
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Why are processing amounts different from one transaction to the next?
Networks classify transactions according to risk, data, card type, and how the payment was accepted. Mastercard identifies merchant category, the time between authorization and clearing, magnetic-stripe data, enhanced transaction data, and merchant sales or transaction volume as factors that can affect interchange qualification. Square also points to card type, transaction channel, transaction amount, and merchant category.
Card-present versus card-not-present
A card dipped, tapped, or swiped at a properly configured terminal is generally treated differently from an online checkout, keyed entry, invoice, or payment link. Card-not-present payments provide less assurance that the physical card and cardholder are present, so their pricing category can differ. Do not assume that an in-person rate applies to manually entered or online transactions.
Data and settlement timing
Missing or incomplete transaction data can move a payment into a less favorable qualification category. The authorization-to-clearing interval also matters. Follow your provider’s settlement procedures and supply any enhanced data required by the applicable program. Mastercard says its interchange schedules are generally updated twice a year, so categories and amounts can change even when your provider’s markup has not.
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Business and ticket characteristics
Merchant category, monthly volume, average ticket, card mix, and the split between in-person, online, keyed, invoice, and recurring payments all influence the effective cost. A business taking many small payments pays the fixed cents component more often relative to sales; a business with larger tickets is affected more by the percentage component.
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Flat-rate and interchange-plus pricing: how the models differ
The two broad comparison axes are pricing structure and transaction mix. Compare the complete schedule, not just the advertised percentage.
| Pricing approach | How it is presented | What to check | Best comparison method |
|---|---|---|---|
| Bundled or flat rate | One published percentage, often plus a fixed amount, by channel | Which channels and card types are included; separate online, keyed, invoice, and premium-card prices; monthly or incidental fees | Apply each quoted rate to your actual number of transactions and average tickets |
| Interchange-plus | Network interchange and assessments passed through, plus a stated provider markup | Markup percentage, per-transaction fee, pass-through assessment treatment, minimums, and statement fees | Use recent statements to model the actual card mix and qualification categories |
| Subscription or membership variation | A recurring fee paired with a lower transaction markup | Monthly commitment, minimums, cancellation terms, included tools, and overage charges | Compare the recurring fee against the savings at your expected volume |
Square advises calculating expected costs for your own profile. A lower per-transaction price paired with a monthly fee can suit one volume pattern, while a higher all-in rate with no recurring fee can suit another. There is no single cheapest model for every merchant.
Square U.S. free-tier rates: a dated example, not an industry average
The following figures are a provider-specific illustration, not a market-wide benchmark. Square’s U.S. educational article lists these free-tier prices; the in-person figure was updated February 25, 2025, and the other figures were stated in the article accessed October 11, 2026. Recheck the provider’s live pricing before relying on them.
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|---|---|---|
| In-person, card-present | 2.6% + 15¢ per transaction | $2.75 |
| Online | 2.9% + 30¢ per transaction | $3.20 |
| Payment Link | 3.3% + 30¢ per transaction | $3.60 |
| Manually entered or card-not-present | 3.5% + 15¢ per transaction | $3.65 |
The dollar examples are arithmetic using the quoted rates and a $100 ticket; they are not additional Square pricing claims. Your effective cost changes with ticket size, refunds, disputes, plan terms, and any other charges in the agreement.
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How to read a processing statement
Start with the statement period and the deposits that reached your bank, then reconcile sales, refunds, and chargebacks. Use this checklist to identify what each line is doing:
- Gross card volume: the sales on which processing was calculated.
- Percentage charges: multiply the stated rate by the relevant volume; check whether different channels have different rates.
- Per-transaction charges: count settled transactions, not just dollars, because fixed cents fees can dominate with small tickets.
- Interchange or network pass-through lines: identify whether these are actual pass-through costs or labels used inside a bundled plan.
- Provider markup: locate the processor’s percentage and fixed fee, including any minimum.
- Monthly, account, batch, gateway, PCI, or chargeback lines: verify each against the contract and ask when a fee is triggered.
- Credits and reversals: confirm how refunds, failed authorizations, and chargebacks are credited or charged.
If a label is unfamiliar, request the provider’s fee schedule and a line-by-line explanation in writing. A deposit total alone can hide the difference between a rate change and a change in sales mix.
How to compare payment processor fees for your business
- Collect representative data. Use several recent months and separate in-person, online, keyed, invoice, recurring, and payment-link volume. Record transaction counts, average tickets, card mix, refunds, and chargebacks.
- Normalize the quote. Put every provider’s percentage, per-transaction amount, monthly fee, minimum, gateway charge, hardware or software charge, and incidental fee into the same worksheet.
- Calculate channel costs. For each channel, use
(volume × percentage) + (transaction count × fixed fee). Add recurring and statement charges afterward. - Model your card mix. If a quote uses interchange-plus, apply the provider’s stated markup to the categories shown on your statements. If a quote is bundled, use the exact channel rates and exclusions.
- Test different volumes. Run low, expected, and high-volume cases. This reveals whether a monthly fee is offset by lower transaction pricing.
- Check operational terms. Confirm funding timing, contract length, cancellation charges, reserve rights, PCI responsibilities, dispute fees, supported channels, and which tools are included.
- Ask for a written effective-cost example. Require the provider to show a sample statement or calculation using your transaction profile, not a generic headline rate.
Two offers with the same percentage can produce different totals if one has a larger fixed fee, different online pricing, or a recurring subscription. Conversely, a higher advertised rate may cost less when it includes services you would otherwise buy separately; count only tools you actually need.
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A surcharge is an extra amount applied to a customer’s credit-card purchase. In the United States, network rules and applicable law govern whether and how you may do this; the rules are not a blanket nationwide permission.
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Visa notice
Visa says a merchant must notify its acquirer 30 days before beginning to surcharge. Your acquirer can explain the current submission process and any additional implementation requirements.
Mastercard limits and disclosure
Mastercard’s U.S. overview describes advance notice to Mastercard and the acquirer, clear disclosure to customers, and a surcharge limited to the merchant’s acceptance cost. It also describes a 4% maximum under Mastercard rules and excludes Mastercard debit and prepaid cards from surcharging. These are network requirements, not a statement that every state permits the practice.
Before activating a surcharge
- Ask your acquirer for the current Visa and Mastercard rules and required notices.
- Check state and federal law for every location where you sell; requirements can differ and change.
- Design receipts, checkout screens, signs, and invoices so the surcharge is clearly disclosed before payment.
- Confirm that debit and prepaid transactions are identified correctly and excluded where required.
- Keep the surcharge within the permitted acceptance-cost limit and maintain documentation supporting your calculation.
Do not turn on a surcharge based only on a processor’s marketing page. Obtain current written guidance from your acquirer and legal advice when the rules are unclear.
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There is no defensible single “typical” percentage for every U.S. merchant. The total depends on channel, card product, ticket size, merchant category, volume, data quality, provider markup, and recurring or incidental charges. A published flat rate from one provider cannot serve as an industry average.
Use your own effective rate as the baseline: divide total processing costs for a period by the card volume for that period, then separately track fixed monthly and dispute-related charges. Compare that result with each proposed provider under the same sales and transaction assumptions.
Quick Recap
Key points to retain
- Interchange generally moves between the acquiring side and the issuing bank; the merchant pays its acquirer or provider under the merchant agreement.
- A total processing price can combine interchange, network assessments, and provider charges, either bundled or itemized.
- Transaction details and merchant characteristics determine qualification, so one headline rate does not predict every business’s cost.
- Compare total costs using actual channels, card mix, ticket sizes, monthly volume, and all recurring or incidental fees.
- Surcharging requires current network notices, customer disclosures, and compliance with applicable law.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
