Interchange-plus is the most transparent pricing model available for credit card processing and the one most likely to save an established business money over the long run. It has become the industry standard among reputable processors in 2026, yet many merchants still process under tiered or flat-rate plans because no one has explained the alternative clearly. This guide breaks down exactly how interchange-plus works, what it costs in practice, and how to decide whether it belongs in your business.
What Is Interchange-Plus Pricing?
Interchange-plus separates the cost of every card transaction into two visible parts. The first is the interchange fee, which is set by the card networks (Visa, Mastercard, Discover, American Express) and paid to the bank that issued the customer’s card. Interchange is effectively the wholesale cost of accepting a card payment, and neither you nor your processor can negotiate it down. The second part is the processor’s markup, sometimes called the “plus” or the margin, which is the amount your processor adds on top of interchange as its own revenue. That markup is negotiable.
When a processor quotes you “interchange plus 0.25% and $0.10,” it means that on every transaction you pay whatever the applicable interchange rate is, plus an additional 0.25 percent of the transaction amount and a flat $0.10 authorization fee. The markup stays the same regardless of which card the customer uses. Only the interchange portion fluctuates.
A Real-World Example
Suppose you run a sandwich shop and a customer pays $10 with a Visa rewards credit card. The interchange rate for that card category might be 1.65% plus $0.10, which comes to $0.265 on a $10 sale. Your processor’s markup is 0.30% plus $0.10, which adds $0.13. The total processing fee on that transaction is $0.395, and you keep $9.605.
If the next customer pays with a debit card, the interchange rate drops to something like 0.05% plus $0.22 under the Durbin Amendment regulated rate for large issuers, so the total cost on that same $10 sale falls sharply. Under a flat-rate plan, both transactions would cost the same percentage, which means you overpay on the debit transaction to subsidize the rewards card. Interchange-plus passes the savings through.
Why Interchange Rates Vary
Visa and Mastercard each publish hundreds of interchange categories, and the rate that applies to any single transaction depends on several factors: the card type (standard credit, rewards credit, corporate, prepaid, or debit), the acceptance method (chip, contactless tap, keyed, or e-commerce), the merchant category code, and whether the transaction meets the network’s data requirements for a lower rate. A card-present tap on a standard debit card is among the cheapest interchange categories. A card-not-present transaction on a corporate rewards card is among the most expensive.
Under interchange-plus, these variations flow through to your statement transparently. Under tiered or bundled pricing, the processor groups transactions into broad buckets like “qualified,” “mid-qualified,” and “non-qualified,” sets a rate for each bucket, and pockets the difference between the bucket rate and the actual interchange. That difference is invisible to the merchant.
Why Interchange-Plus Is Preferred
The central advantage is transparency. When you can see exactly what interchange is being charged on each transaction and exactly what the processor is adding, you can do three things that are impossible under tiered pricing. First, you can compare processor quotes on an apples-to-apples basis by looking only at the markup, since interchange is the same regardless of which processor you use. Second, you can audit your statements to confirm the processor is not inflating the interchange portion, a practice sometimes called interchange padding. Third, you can identify opportunities to lower interchange by adjusting how you accept cards, such as prompting for PIN on debit or settling batches daily.
The result, for most businesses processing more than a few thousand dollars per month, is a meaningfully lower effective rate compared to tiered or flat-rate alternatives.
Potential Drawbacks
Interchange-plus statements are more detailed than flat-rate receipts, and that detail can feel overwhelming at first. Each line item shows a different interchange category and rate, and a single month’s statement can run several pages. Some processors organize this data clearly with subtotals and summaries; others produce statements that are nearly unreadable. If your processor’s statement is confusing, that is a reason to ask for a cleaner format or to shop for a different processor, not a reason to switch pricing models.
There is also a floor effect. For very small businesses processing only a few hundred dollars a month, the difference between interchange-plus and a flat 2.6 percent may amount to just a few dollars. At that volume, the simplicity of flat-rate pricing may be worth the small premium.
Who Should Use Interchange-Plus
Interchange-plus is the right model for most businesses that process more than roughly $5,000 per month, accept a mix of card types, or want the ability to compare processor costs precisely. It is especially valuable for businesses with a high proportion of debit transactions, because debit interchange is far cheaper than credit interchange and the savings pass through directly.
If you are brand new, processing very low volume, or prefer absolute simplicity over cost optimization, a flat-rate aggregator like Square or Stripe may be a better starting point. But even then, once your volume grows, moving to interchange-plus should be near the top of your list of cost-cutting measures.
How to Compare Interchange-Plus Quotes
When evaluating processors, ask each one to quote the interchange-plus markup and all recurring monthly fees side by side. The markup has two components: a percentage (often 0.10% to 0.50% for competitive quotes) and a per-transaction fee (often $0.05 to $0.15). Lower is better on both. Then compare monthly fees including statement fees, PCI compliance fees, batch fees, and any monthly minimums. A low markup paired with high monthly fees can cost more than a slightly higher markup with no monthly fees, so total cost at your expected volume is what matters.
Finally, read the contract for an early termination fee. Reputable processors offering interchange-plus typically do not lock merchants into long-term contracts, and the best ones offer month-to-month terms with no cancellation penalty.
The Bottom Line
Interchange-plus pricing gives merchants the clearest view into where their processing dollars go and the strongest position from which to negotiate. It is not the simplest model to read on a statement, but it is the fairest, and for any business with meaningful card volume it is almost always the least expensive. Understanding it is one of the most valuable things a business owner can do to take control of processing costs.