Interchange-Plus Pricing

What Is Interchange-Plus Pricing?

Interchange-plus pricing (also called cost-plus or interchange pass-through) is a merchant payment processing model in which every fee component is itemized separately. The merchant pays the actual interchange fee set by the card network, plus a fixed, disclosed markup from the payment processor. Because interchange rates vary by card type, transaction method, and merchant category, each transaction may carry a slightly different cost: but the processor's margin stays constant and auditable.

This model stands in contrast to flat-rate pricing (a single blended percentage for all transactions) and tiered pricing (transactions bucketed into qualified, mid-qualified, and non-qualified tiers). Industry analysts and merchant advocates widely consider interchange-plus the most transparent pricing structure available, since merchants can verify that the interchange portion matches the card networks' published rate schedules.

How It Works

Every card transaction under interchange-plus incurs three separate cost layers. The total of these three components equals the merchant discount rate for that transaction.

The Three Components

1. Interchange fee: paid to the card-issuing bank (the issuer). Set by Visa, Mastercard, Discover, or Amex. Non-negotiable and identical for every processor. Rates are updated biannually, typically in April and October.
2. Assessment fee: paid to the card network itself for use of its infrastructure. Also non-negotiable. Visa charges approximately 0.14% + $0.0195 per credit transaction; Mastercard charges approximately 0.1275% + $0.0195 for transactions under $1,000. These are sometimes grouped under scheme fees.
3. Processor markup: the only negotiable component. Expressed as a percentage plus a flat per-transaction fee: for example, 0.25% + $0.10. This is how the acquirer and processor earn revenue.

A typical rate quote looks like: "interchange + 0.30% + $0.10." The processor passes through whatever interchange and assessment fees apply to the specific card used, then adds the fixed markup on top.

Cost Breakdown Example

Consider a $100 in-person purchase made with a standard Visa consumer credit card, processed under interchange-plus with a 0.30% + $0.10 markup:

The effective rate is 2.17%. If the same merchant accepted a regulated debit card (capped at 0.05% + $0.22 under the Durbin Amendment), the total would drop to approximately $0.82: an effective rate of just 0.82%.

Interchange Fee Ranges

Interchange rates vary widely depending on card type and whether the card is present at the point of sale:

These are representative Visa and Mastercard rates for common US retail categories. Rates vary further by merchant category code (MCC): supermarkets, utilities, and charities often have lower interchange schedules. For a deeper analysis of these cost structures, see the merchant payment acceptance costs research article.

Interchange-Plus vs. Other Pricing Models

Three pricing models dominate the card processing industry. Understanding how they compare is essential for choosing the right approach. For a broader look at card network economics, see the card network economics deep dive.

Flat-Rate Pricing

Flat-rate processors charge a single blended percentage for all transactions regardless of card type. Common rates include 2.6% + $0.15 for in-person and 2.9% + $0.30 for online transactions. The simplicity is appealing: no statement analysis, no rate tables, no surprises. But that simplicity comes at a cost.

When a customer pays with a regulated debit card (interchange of 0.05% + $0.22), a flat-rate processor still charges the full 2.6%. The processor keeps the spread. When a customer pays with a premium rewards card (interchange above 2.0%), the processor absorbs the shortfall. In aggregate, flat-rate processors set their blended rate high enough to profit across all card types: merchants with a heavy debit mix subsidize those with premium cards.

Tiered Pricing

Tiered pricing sorts transactions into three buckets: qualified (typically 1.4% to 1.8%), mid-qualified (2.0% to 2.5%), and non-qualified (2.8% to 4.0%+). While the qualified rate looks attractive in marketing materials, the processor controls which tier each transaction falls into. In practice, a majority of transactions often land in the mid- or non-qualified tiers, making the effective rate significantly higher than the advertised qualified rate.

Industry analysts rarely recommend tiered pricing because it combines the complexity of variable rates with the opacity of processor-controlled classification.

Model Comparison

Use Cases

When Interchange-Plus Makes Sense

• Established businesses processing over $5,000 per month: the savings from accurate interchange pass-through typically outweigh the added complexity. A restaurant processing $1.65 million annually might save over $8,000 per year compared to flat-rate pricing.
• High debit card mix: gas stations, convenience stores, and grocery stores see enormous savings because regulated debit interchange (0.05% + $0.22) is far below any flat rate. A gas station processing $5.7 million annually could save nearly $60,000 per year.
• B2B merchants using Level 2 and Level 3 data: submitting enhanced transaction data (purchase order numbers, line-item detail) can qualify transactions for lower interchange categories. Interchange-plus passes these savings through; flat-rate does not.
• Merchants who want to audit and optimize: interchange-plus statements reveal exactly where costs come from, enabling merchants to identify opportunities like encouraging debit usage or avoiding downgrades.

When Flat-Rate Makes Sense

• Low-volume businesses under $2,000 per month: the absolute dollar savings from interchange-plus are minimal at this scale, and monthly account fees may offset them.
• Startups and pop-up shops: flat-rate processors offer instant onboarding with no contracts, credit checks, or commitments. Speed matters more than optimization.
• Businesses that prioritize simplicity: if nobody on the team can read a 15-page merchant statement, flat-rate's predictability has real value.

Why It Matters

Payment processing fees are one of the largest operating costs for merchants after rent and labor. For businesses processing millions in card volume, even a 0.3% difference in effective rate translates to tens of thousands of dollars annually. Interchange-plus pricing gives merchants the tools to understand, audit, and negotiate these costs.

The transparency of interchange-plus also creates competitive pressure. Because every processor pays the same interchange rates, merchants can compare processor markups directly. A quote of "interchange + 0.20% + $0.08" is objectively cheaper than "interchange + 0.40% + $0.15," while flat-rate pricing obscures the processor's actual margin.

As newer payment rails emerge (including stablecoin payment rails and blockchain-based settlement systems), the distinction between interchange-based card costs and alternative processing models becomes increasingly relevant. Solutions built on Bitcoin and stablecoin infrastructure can bypass interchange entirely, offering merchants a fundamentally different cost structure. For an in-depth comparison, see the stablecoin payment rails vs. traditional research article.

Regulatory Context

Interchange fees are subject to regulation in several major markets, which directly affects what merchants pay under interchange-plus:

• Durbin Amendment (US): caps regulated debit interchange at 0.05% + $0.22 for banks with over $10 billion in assets. In August 2025, a US District Court vacated the Federal Reserve's Regulation II implementing this cap, ruling the Fed exceeded its authority in how costs were calculated. The decision is stayed pending appeal: current caps remain in effect during proceedings.
• Visa/Mastercard antitrust settlement (US): announced in March 2024, the proposed settlement requires a minimum 7-basis-point (0.07%) system-wide reduction in credit interchange rates for five years, with all categories seeing at least a 4-basis-point reduction. Final court approval is expected in late 2026 or early 2027.
• EU Interchange Fee Regulation: caps consumer debit interchange at 0.2% and consumer credit at 0.3% for intra-EEA transactions. In effect since 2015 and continuing through 2026.

These regulatory actions directly benefit merchants on interchange-plus pricing, since any mandated interchange reduction flows through to lower costs. Flat-rate processors, by contrast, may retain the savings as additional margin without passing them to merchants.

Risks and Considerations

Statement Complexity

Interchange-plus statements can run 8 to 20 pages with dozens of line items across hundreds of interchange categories. Without the knowledge to audit them, merchants may miss billing errors, incorrect downgrades, or hidden fees that processors sometimes add alongside the disclosed markup (such as PCI non-compliance fees, batch fees, or statement fees).

Monthly Cost Variability

Because each transaction carries a different interchange rate based on the card used, monthly effective rates can swing by 0.05 to 0.15 percentage points depending on the card mix. A month with more premium rewards cards will cost more than one with primarily debit transactions. This unpredictability requires merchants to budget based on averages rather than fixed costs.

Default Markups May Not Be Competitive

Processors offering interchange-plus sometimes quote default markups of 0.50% to 0.80% + $0.10 to $0.25 per transaction: rates high enough to rival flat-rate pricing. Merchants must negotiate to reach competitive levels (0.15% to 0.30% + $0.08 to $0.10). Without negotiation, interchange-plus loses its cost advantage.

Slower Onboarding

Traditional interchange-plus merchant accounts typically require 5 to 14 days for underwriting and approval, including credit checks and business verification. This contrasts with flat-rate aggregators that can onboard merchants in minutes. For businesses needing to accept payments immediately, this delay can be a dealbreaker.

Network Fee Creep

Card networks have steadily introduced new fees beyond base interchange and assessments. Visa's Digital Commerce Service Fee (introduced in 2025) and Mastercard's Transaction Processing Excellence Fee add costs that fall outside the traditional interchange-plus framework. Merchants must monitor these additions since they are passed through under interchange-plus but absorbed within flat-rate pricing.

This glossary entry is for informational purposes only and does not constitute financial or investment advice. Always do your own research before using any protocol or technology.