Interchange-plus pricing sounds technical, but the idea is simple: you pay exactly what Visa, Mastercard, and Discover charge the processor, plus a small, fixed margin on top. Nothing is bundled, nothing is hidden, and every line on your statement is traceable. If you have ever wondered why your effective rate bounces around month to month, the answer is almost always that your pricing model is not showing you the real cost—it is averaging it, marking it up, and pocketing the difference. This article breaks down how interchange-plus works, shows the math on three common ticket types, and explains why it is the pricing model we use for every merchant at Zend Blue.
How Interchange-Plus Actually Works
Every time a card is swiped, tapped, or keyed, the card network sets a base fee called interchange. That fee goes to the card-issuing bank as compensation for the credit risk and rewards program it funds. Interchange is not one number—it is a table of hundreds of rates that vary by card type, card brand, transaction method, and merchant category. A basic debit card costs less to process than a premium travel rewards card, which costs less than a corporate purchasing card.
Under interchange-plus, your processor passes that exact interchange cost to you and then adds a fixed markup, usually expressed as a percentage plus a per-transaction cent amount. For example: interchange + 0.30% + $0.10. That markup is the processor's revenue. It does not change based on which card your customer pulls out of their wallet. The interchange portion does change, and that is appropriate—it reflects the actual cost of that specific transaction.
Flat-rate processors like Square or Stripe charge one blended rate regardless of card type. That simplicity costs you money whenever a customer pays with a cheap debit card, because the processor keeps the spread between the flat rate and the lower interchange cost. Interchange-plus eliminates that spread.
What Interchange Rates Look Like in Practice
Interchange rates are published publicly by Visa and Mastercard. They range from under 0.20% on a PIN-debit transaction to over 2.70% on a high-tier corporate card. The most common categories a small business encounters are:
- Consumer debit (PIN or signature): typically 0.05%–1.19% plus a few cents
- Consumer rewards credit: typically 1.50%–2.10% plus a few cents
- Corporate or purchasing cards: typically 2.50%–2.95% plus a few cents
Those ranges are illustrative. Your actual interchange depends on your MCC, how you capture the card, and whether the transaction qualifies for the best available rate. Miskeyed cards, missing data fields, and downgrades can push a transaction into a higher bucket. A good processor watches for that. We do.
Worked Math: The Same $60 Ticket, Three Different Cards
Let's run the same $60 sale through three card types under interchange-plus pricing versus a typical flat-rate model. The interchange-plus markup used here is illustrative; your actual markup is set at account setup and confirmed through a statement review.
| Card Type | Interchange (illustrative) | I+ Markup (illustrative) | Total Fee | Flat Rate 2.6% + $0.10 | You Save |
|---|---|---|---|---|---|
| Consumer debit | $0.22 + 0.05% = $0.25 | 0.30% + $0.10 = $0.28 | $0.53 | $1.66 | $1.13 |
| Rewards credit | 1.80% + $0.10 = $1.18 | 0.30% + $0.10 = $0.28 | $1.46 | $1.66 | $0.20 |
| Corporate card | 2.65% + $0.10 = $1.69 | 0.30% + $0.10 = $0.28 | $1.97 | $1.66 | –$0.31 |
A few things jump out. On the debit card, interchange-plus is dramatically cheaper—you save over a dollar on a $60 ticket. On the rewards card, you still save. On the corporate card, you pay a bit more than the flat rate. That is honest math. Corporate cards are genuinely expensive, and flat-rate pricing hides that cost by subsidizing it with your debit transactions. Interchange-plus shows you the truth on every row.
If your business runs mostly debit and consumer credit, interchange-plus almost always wins. If you run a high volume of corporate cards—say, a B2B supplier or a contractor billing to business accounts—you need to look at your actual card mix before deciding. We will do that analysis for free.
Why Does the Corporate Card Cost More?
Corporate and purchasing cards carry higher interchange because the issuing bank takes on more risk and funds enhanced cardholder benefits—expense reporting tools, higher credit lines, travel protections. Visa and Mastercard set those rates, not processors. Under flat-rate pricing, your processor charges the same 2.6% whether it is a debit card or a corporate card, which means debit transactions subsidize corporate ones. You never see the breakdown, so you never know.
Under interchange-plus, corporate cards cost what they cost. You see it on your statement. You can make informed decisions—like offering ACH as an alternative payment method for large B2B invoices, where our rate is 0.9% or $0.50, whichever is greater, capped at $1,000 per transfer. On a $5,000 invoice, ACH costs $45. A corporate card at 2.75% costs $137.50. That is a real decision worth making.
What Does Interchange-Plus Look Like on a Statement?
A wholesale interchange-plus statement lists every transaction batch, the interchange category it qualified for, the interchange cost, and the processor markup separately. You can add up the interchange column, add up the markup column, and verify that nothing extra appears. That transparency is the whole point.
Flat-rate statements often show one line: total fees. Tiered-pricing statements show qualified, mid-qualified, and non-qualified buckets, which are arbitrary groupings that favor the processor. Neither model lets you verify what you actually paid versus what the network charged.
When we do a free statement review, the first thing we look for is whether the current processor is showing interchange passthrough or burying it. Most small business owners are surprised to find they have never seen a real interchange line on any statement they have received.
Is Interchange-Plus Right for Every Business?
For most businesses processing more than $5,000 per month in cards, yes. The savings on debit and standard consumer credit cards are consistent and meaningful. The transparency alone is worth the switch—you stop guessing at your effective rate and start managing it.
For very low-volume businesses doing a few hundred dollars a month, flat-rate simplicity may outweigh the savings, simply because the dollar difference is small and the mental overhead of reading a detailed statement may not feel worth it. But once volume grows, the math tips decisively toward interchange-plus.
Businesses with unusual card mixes—heavy corporate card volume, lots of international cards, or a high rate of card-not-present transactions—need a card mix analysis before assuming interchange-plus will save money on every line. It will save money in aggregate for most of them, but the honest answer is: run the numbers on your actual statement.
The chart below shows illustrative effective rates across pricing models. Numbers are illustrative and will vary by business.
What to Do Next
If you want to see what interchange-plus would cost on your actual card mix, the fastest path is a free statement review. Upload or text us a recent statement and we will show you the real math—interchange cost, current markup, and what a wholesale interchange-plus account would look like for your business.
Run a quick estimate now at our free calculator: https://www.zend.blue/#calculator
Text us at 580-910-9100 for a free statement review and we will turn it around fast.
If you are also looking at tools to reduce admin overhead—automated follow-up, text invoicing, scheduling, and a CRM that does not require a full-time operator—visit https://www.zend.blue/pricing to see Pocket Boss plans starting at $100 per month with no setup fee.
Figures in this guide are illustrative estimates, not a quote. Your rate depends on card mix, ticket size and business type, and is confirmed through a statement review.