Processing Fees
What Are Processing Fees? Definition and How They Work
Definition
Processing fees are the charges a merchant pays to accept electronic payments, encompassing all costs in the payment chain: interchange fees paid to the issuing bank, scheme fees paid to the card network, and the payment service provider's margin for gateway, acquiring, and processing services. The total processing fee on a card transaction is the sum of these components, and understanding each component is essential for merchants seeking to manage and optimise their total cost of card acceptance.
How it works
Processing fees are composed of three main layers, each paid to a different participant in the payment chain.
Interchange is the largest component, paid by the acquirer to the issuing bank on every transaction. Interchange rates are set by the card scheme (Visa, Mastercard) and vary by card type (debit, credit, commercial), transaction channel (card-present, card-not-present), merchant category, and authentication method. In the EU, consumer card interchange is capped at 0.2% for debit and 0.3% for credit by the Interchange Fee Regulation. In the US, there is no cap on consumer credit card interchange (which averages 1.5% to 2.5%), though large-bank debit card interchange is capped by the Durbin Amendment.
Scheme fees are charged by the card network (Visa, Mastercard) for use of their network infrastructure and brand. Scheme fees include authorisation fees, cross-border fees, assessment fees (a percentage of transaction value), and network access fees. Scheme fees are typically 0.05% to 0.15% of transaction value plus per-transaction fixed components, varying by transaction type and geography.
PSP margin is the payment provider's charge for gateway, acquiring, and processing services: the technology infrastructure, risk management, customer support, and commercial margin above the underlying interchange and scheme costs. Under interchange-plus pricing, this margin is disclosed separately from interchange and scheme fees. Under blended pricing, all three components are combined into a single flat rate.
Total cost of acceptance varies significantly by merchant: card mix (credit versus debit, domestic versus international), transaction channel (card-present typically cheaper than card-not-present), and pricing model (interchange-plus versus blended) all drive material differences in effective rates.
Why it matters
Processing fees are the second or third largest cost item for many card-accepting merchants, particularly those in low-margin categories like grocery, fuel, and utilities. Understanding fee composition enables merchants to identify the largest cost drivers and the specific levers available to reduce them: negotiating PSP margin, optimising for debit over credit card acceptance, implementing surcharging where permitted, or migrating high-cost card-present transactions to lower-cost alternative payment methods.
Blended pricing (a single flat rate covering all components) is simple to understand but conceals the fee structure, making it impossible to identify optimisation opportunities or verify that the effective rate is competitive. Interchange-plus pricing provides full transparency: merchants see exactly what they are paying in interchange, scheme fees, and PSP margin on each transaction, enabling informed comparison and negotiation.
Total cost of acceptance analysis should extend beyond the per-transaction rate to include all payment-related costs: chargeback fees, dispute processing costs, fraud losses, PCI compliance costs, and the operational overhead of payment reconciliation and exception management. The headline transaction rate may be competitive while total payment cost remains high due to excessive chargebacks or fraud.
With PXP
PXP supports merchants and partners across the payments value chain. To talk through the cost of payment acceptance as part of your payment strategy, get in touch with our team.
Frequently asked questions
What is the difference between interchange-plus and blended pricing?
Interchange-plus pricing passes through the exact interchange cost for each transaction plus a fixed PSP margin on top, with scheme fees either included in the margin or listed separately. The total cost varies by transaction depending on the interchange category. Blended pricing applies a single flat rate to all transactions regardless of card type or interchange category. Interchange-plus is more transparent and typically cheaper at scale for merchants with a mix of debit and lower-cost credit cards; blended pricing is simpler to understand and budget for but often more expensive.
What are scheme fees and how are they calculated?
Scheme fees are charges levied by card networks (Visa, Mastercard) for use of their network. They include authorisation fees (per-authorisation fixed fee), assessment fees (percentage of transaction value, typically 0.10% to 0.14%), cross-border fees (additional percentage on transactions where the issuer is in a different country from the acquirer), and various network-specific charges. Scheme fees change periodically; Visa and Mastercard each update their fee schedules multiple times per year, and merchants on interchange-plus pricing see these changes flow through directly.
How do processing fees differ for card-present versus card-not-present transactions?
Card-present transactions (in-store with chip or contactless) have lower interchange rates than card-not-present transactions (online) because the fraud risk is lower: chip authentication and cardholder presence reduce the probability of fraudulent use. In the US, card-not-present interchange is typically 0.3 to 0.8 percentage points higher than card-present interchange for the same card type. This difference is one reason that merchants accepting both in-person and online payments have higher average processing fees for their online channel.
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