A payment pricing model where the processor charges the card network interchange fee plus a fixed markup. It is useful because the merchant can see the non-negotiable network cost separately from the provider’s margin. That transparency makes it easier to compare offers and understand effective processing expense.
How Interchange-Plus Pricing Works
Interchange-plus pricing separates the card network’s interchange fee from the processor’s markup, so the merchant can see the underlying network cost and the provider’s margin as distinct line items. That structure is one reason it is often viewed as a more transparent billing model than blended pricing.
The model typically includes a fixed per-transaction amount, a percentage markup, or both, added on top of the interchange rate set by the card networks. Because interchange varies by card type, transaction channel, and risk characteristics, the merchant’s effective cost can still change from one payment to the next even when the processor’s markup stays consistent.
This pricing approach is primarily a commercial and operational transparency model, not a security control model. Its value comes from cost visibility, fee traceability, and the ability to compare offers using the same underlying cost structure rather than a single bundled rate.
Why Merchants Use It
Merchants often prefer interchange-plus pricing when they want to understand what they are actually paying for payment processing. Seeing interchange separately helps distinguish fees that the processor controls from fees that are imposed by the card ecosystem.
That distinction makes it easier to evaluate whether a quoted rate is competitive, especially for merchants with mixed transaction types or higher average ticket values. It can also reduce the ambiguity that sometimes appears in tiered or blended models, where the effective rate may be harder to audit.
For finance and operations teams, the model can improve reconciliation and budgeting because the processor’s margin is explicit. The tradeoff is that monthly statements may be less predictable than a flat-rate model, because the final charge reflects the exact mix of transactions rather than a single all-in percentage.
How It Differs From Other Pricing Models
Interchange-plus is best understood by comparison with flat-rate and tiered pricing. Flat-rate pricing simplifies forecasting by charging the same percentage for most transactions, but it hides the interchange component inside one bundled rate. Tiered pricing groups transactions into categories, which can make the final effective rate difficult to predict or explain.
With interchange-plus, the merchant sees the processor markup directly, which can make comparisons more rigorous. That does not automatically mean it is cheaper in every case, but it does make the pricing logic easier to test against actual volume, card mix, and acceptance channel.
For businesses with enough payment volume, the visibility can be useful in vendor negotiations. For smaller merchants, the extra detail may matter less than simplicity, particularly if the absolute fee difference is modest.
What Merchants Should Look For
When evaluating an interchange-plus offer, the key question is not just the markup percentage. Merchants should also examine per-transaction fees, monthly account fees, gateway fees, PCI-related charges, minimums, and any miscellaneous service fees that can materially affect the effective cost.
It is also important to confirm whether the processor passes through interchange exactly as published and whether the statement format is sufficiently detailed to reconcile individual transactions. If the pricing is advertised as transparent but the invoice obscures category-level detail, the practical benefit of interchange-plus is reduced.
In payment operations, clarity is the main advantage. A transparent pricing structure helps merchants identify unusual charges, compare providers with less distortion, and understand how transaction characteristics influence their total processing expense.
Risk and Threat Considerations
Interchange-plus pricing carries a commercial and governance risk if merchants rely on the headline markup alone and ignore the pass-through fees, add-ons, and statement line items that determine the true cost. The model is transparent, but only if the statement is reviewed carefully and the fee categories are understood.
Failure mechanism: Poor fee visibility, undisclosed ancillary charges, or weak statement reconciliation can mask the effective processing rate and make vendor comparisons misleading.
Impact: Merchants may overpay, miss contract drift, or fail to detect pricing changes that materially affect margins and payment-channel economics.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST CSF 2.0 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | GV.SC — Supply Chain Risk Management | Payment processors and fee pass-throughs create third-party dependency and governance risk. |
| Recommendation — Review processor contracts and monitor fee changes as a third-party governance control. | ||
| CIS Controls v8 | 15 — Service Provider Management | Merchants depend on a payment processor’s outsourced service and pricing integrity. |
| Recommendation — Track processor terms, fees, and service changes under third-party management controls. | ||
Practitioner Guidance
Governance implication: Treat interchange-plus as a pricing disclosure model that needs periodic review, not as a guarantee of low cost. The practical test is whether the merchant can reconcile the processor’s markup, the interchange pass-through, and all non-interchange fees from the statement.
What to watch for: Be alert to contracts that describe interchange-plus clearly but still add layered service fees, minimums, or statement surcharges that change the effective rate. Those items often matter more than the headline markup in real-world spending.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on September 20, 2026.
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