Card processing fees explained: what you’re actually paying and why

Every time a customer pays by card, a set of fees is deducted from the transaction before the money reaches the merchant’s account. These charges are collectively called card processing fees, but that label covers several distinct costs — each set by a different party. Understanding who charges what, and why, is the first step to knowing whether your current rate is reasonable.

The fee is paid by the merchant in the vast majority of cases. In some markets and under certain conditions, merchants are permitted to pass part of it on as a surcharge to the cardholder, but this is regulated differently by country and card network. For most businesses, card processing fees are a fixed operating cost that shows up as a deduction from settlement — often without an itemized breakdown.

What this fee is

Card processing fees are not a single charge. They are a bundle of at least three separate costs, combined into one deduction from your settlement:

• Interchange fee: set by the card network (Visa, Mastercard, and equivalents) and transferred from the merchant’s bank to the cardholder’s bank. This is typically the largest component, and its rate is fixed by the network — neither the merchant nor the processor controls it.
• Scheme or assessment fee: charged by the card network for access to its payment infrastructure. This is a small percentage of transaction volume and is separate from interchange.
• Acquirer or processor markup: the charge from the company that handles settlement and transaction management. This is the only component that is commercially negotiable between the merchant and their provider.

The label “processing fee” implies the charge is for handling work. In practice, the majority of the cost — the interchange component — is a structured transfer between banks, determined primarily by the type of card the customer used, not by anything the merchant chose or did. That is why two merchants using the same processor can end up with very different effective rates depending on their customers’ card mix.

How it is calculated

The total fee depends on which pricing model your processor applies and what cards your customers pay with.

• Flat-rate pricing: one fixed rate — a percentage plus sometimes a flat per-transaction amount — applied to every card transaction regardless of card type or actual interchange cost. Predictable for budgeting, but the rate is set above the cost of low-interchange cards to absorb the cost of high-interchange ones.
• Interchange-plus pricing: the actual interchange cost is passed through at cost, and the processor adds a fixed, disclosed markup (for example, a stated percentage plus a flat per-transaction amount). The most transparent model; each party’s charge is visible separately.
• Tiered pricing: transactions are grouped into rate buckets — typically called “qualified”, “mid-qualified”, and “non-qualified” — at rates the processor defines. The rules for which transactions land in which tier are usually opaque, making it difficult to verify categorization or compare providers accurately.
• Subscription or membership pricing: a flat monthly fee buys access to interchange-at-cost rates plus a small per-transaction fee. Can lower the effective rate at sufficient volume because the processor’s margin is fixed rather than percentage-based.

The percentage is always applied to the transaction amount. Key factors that determine the interchange rate on any given transaction:

• Card category: basic debit, standard credit, rewards, premium travel, or corporate/commercial card
• Presentation method: chip or contactless in-person versus card-not-present (online, phone, or mail order — these attract higher interchange)
• Merchant category code (MCC): some industries qualify for preferential rates
• Issuing country: cross-border cards attract additional scheme fees and often higher interchange

As a rough order of magnitude in 2026, total effective rates for domestic consumer card transactions have varied from below 1.5% to above 3.5%, depending on pricing model, card mix, and market. These are ranges to calibrate expectations only. The processor’s published fee schedule is the authoritative source for current rates — not any figure in this article.

When you get charged

• Every completed card transaction triggers a fee, including contactless payments and mobile wallet transactions that draw from an underlying card.
• Card-not-present transactions — online, telephone, and mail-order payments — are charged at higher interchange rates than in-person transactions. A business that operates both a physical and an online channel pays two different rates on the same processor.
• Rewards and premium cards (travel, cashback, and corporate cards) carry higher interchange than basic debit or standard consumer credit cards. The merchant has no control over which card the customer presents.
• Cross-border transactions, where the card was issued in a different country, attract additional network fees and typically higher interchange.
• Refunds: many processors do not return the original processing fee when a transaction is reversed. The merchant loses both the fee and the revenue from the sale.
• Chargebacks: a disputed transaction results in the transaction amount being returned to the cardholder, plus a separate chargeback fee charged to the merchant — often regardless of the dispute outcome, depending on contract terms.
• Monthly minimum fees: if card volume falls below a defined threshold in a given month, some processors charge a fee to make up the shortfall.
• Fixed periodic fees: account maintenance, PCI compliance, gateway access, and statement delivery are charged monthly or annually regardless of transaction volume, and are easily overlooked when comparing headline rates.

Can you avoid it

For any merchant that accepts cards, the interchange component cannot be avoided — it is set by card networks and applies universally. The practical question is how much of the total is reducible.

• Negotiate the processor markup if your monthly card volume is significant. The interchange portion is fixed, but the acquirer or processor margin is a commercial term. Processors become meaningfully more willing to negotiate above volume thresholds that vary by provider — this is worth raising directly.
• Switch from tiered or flat-rate to interchange-plus pricing to remove the premium embedded in bundled rates and to make the cost of each component transparent and auditable.
• Improve transaction data quality: in markets where Level 2 and Level 3 data programs exist (primarily B2B and government purchasing in the US and some other markets), submitting richer transaction data can qualify for lower interchange rates on eligible commercial cards.
• Use card-present acceptance wherever possible: keyed-entry and card-not-present transactions are more expensive. A chip reader or contactless terminal for in-person sales moves transactions to the lower card-present interchange rate.
• Check your MCC: a misclassified merchant category code may be costing you a higher interchange rate than applies to your actual business type. Ask your processor to confirm or review the code assigned to your account.
• Surcharging — adding a visible fee to the customer’s bill to recover processing costs — is permitted in some markets and prohibited in others. It transfers the cost rather than eliminating it, and may affect purchasing behavior. Rules differ by country, by US state, and by card network; verify the current rules in your jurisdiction before implementing.
• Steering customers to lower-cost payment methods such as bank transfers (ACH, SEPA) reduces the share of card volume attracting processing fees. Some markets have restrictions on payment steering that affect how this can be done.

The honest summary: for small merchants with low volume, the fee is largely a fixed operating cost. For larger merchants, the markup component is negotiable and the pricing model is changeable. There is no way to accept card payments at zero cost.

What it really costs over a year

To compare pricing models or providers, convert the rates into total annual cost on the same revenue base.

All figures below are illustrative examples only. They are not quoted rates and will not match any specific provider’s current schedule.

Assume a business processes $400,000 in card payments per year with a typical mix of consumer credit, debit, and rewards cards.

The gap between the flat-rate and interchange-plus scenarios in this example is $4,400 per year. On $1,000,000 in annual card volume, the same percentage spread produces a gap of roughly $11,000.

These figures exclude fixed fees. In practice, add the following to any annual comparison:

• Monthly account fee (for example, $25–$50/month adds $300–$600/year)
• PCI compliance fee (for example, $50–$200/year depending on provider and compliance tier)
• Any monthly minimum fees, gateway fees, or per-transaction flat amounts

To run this comparison against your own data:

1. Pull three to six months of card processing statements and identify total card volume and total fees actually deducted — not the headline rate you were quoted.
2. Divide total fees by total volume to calculate your actual effective rate.
3. Apply each prospective provider’s pricing structure to the same volume.
4. Add all fixed fees to each option and project to 12 months.

A provider quoting a lower percentage rate may cost more annually once fixed fees, per-transaction amounts, and card-type surcharges are factored in.

What to check before you commit

• Ask whether the pricing model is flat-rate, interchange-plus, or tiered — and request the full interchange schedule the processor applies, not just the summary headline rate.
• Ask for the per-transaction flat fee charged in addition to the percentage, and confirm whether it applies to refunds, to authorizations that do not result in a capture, and to declined transactions.
• Ask for a complete list of fixed fees: monthly account fees, PCI compliance fees, gateway fees, statement fees, and any annual charges. These are frequently absent from initial quotes and proposals.
• Ask how card-not-present transactions, internationally issued cards, and commercial or corporate cards are priced relative to standard in-person domestic consumer card transactions.
• Ask what the chargeback fee is, what your chargeback ratio threshold is before your account terms are reviewed, and what the contractual notice period is for any rate change.
• The authoritative fee schedule is in the merchant agreement and the rates and fees addendum — not in the sales proposal or marketing summary. Request the full contract documents before signing.
• Card network interchange schedules are updated periodically — typically twice a year — and processor markups can change with contractual notice. Check your agreement for the required notice period before a rate increase takes effect, and whether you can exit without a penalty if rates change materially.

Frequently asked questions

Who actually pays card processing fees — the merchant or the customer?

The merchant pays the fee directly, as a deduction from the settlement amount before funds are deposited. Customers do not see the charge on their card statement. In markets where surcharging is legally permitted and compliant with card network rules, a merchant may pass part of the cost to the cardholder as a disclosed surcharge — but this varies significantly by country and card type.

What is the difference between interchange and a processing fee?

Interchange is the portion set by the card network and transferred from the merchant’s bank to the cardholder’s bank. The payment processor does not keep interchange — it flows through to the card issuer. The processing or acquiring fee is the separate charge from the company managing the merchant’s transactions. Most quoted rates bundle both together, which makes it difficult to see what each party actually charges.

Why did my effective rate go up without any change on my end?

Card networks revise interchange schedules periodically, typically twice a year. If more of your customers shifted to paying with premium rewards or commercial cards, your blended effective rate rises even if the processor’s markup is unchanged. Processors may also adjust their markup within the terms of the merchant agreement. Review your agreement for the required notice period and check your statement’s transaction breakdown to see whether your card-type mix has changed.

Can I pass the processing fee on to my customers as a surcharge?

Rules differ significantly by jurisdiction. In the United States, surcharging on credit cards is broadly permitted at the federal level but is banned or restricted in some states; surcharging on debit cards is more broadly restricted. In the European Union and the United Kingdom, surcharging on consumer credit and debit cards is prohibited by regulation. Australia permits surcharges but limits them to the merchant’s reasonable cost of acceptance. Check the current rules in your jurisdiction and the relevant card network’s requirements before implementing.

Are card processing fees tax-deductible for a business?

In most jurisdictions, fees paid to process business transactions are treated as ordinary business expenses and are deductible against business income. The correct treatment depends on your business structure, accounting method, and local tax rules. This article cannot substitute for qualified tax advice — consult an accountant or tax professional for guidance specific to your situation.

Rates are a moving target

Card network interchange schedules are updated periodically — typically on a twice-yearly cycle — and processor markups are subject to change within the terms of a merchant agreement. Any figure in this article, including the illustrative examples in the annual cost section, reflects general conditions as of mid-2026 and will date.

The only authoritative source for the fees that apply to your specific account is your processor’s current fee schedule and merchant agreement. Request an up-to-date copy, read the rates and fees addendum, and note the contractual notice period for rate changes and your options if an increase occurs.

Where processing costs have tax implications — for example, when fees need to be allocated across legal entities or product categories — consult a qualified tax professional rather than relying on general guidance.