A practical guide to understanding transparent card processing costs

Interchange Plus Pricing: What It Means and When It Fits Your Business

If you have ever spent twenty minutes staring at a merchant services statement, you know the moment: a $100 card sale on Tuesday cost you a dollar-ninety-something, and a nearly identical sale on Wednesday cost more than double. The line items do not help much. One says "interchange." One says "assessments." One says something vague like "downgrade" with no explanation of what qualified or failed to qualify. Most owners do not start out researching pricing models. They start out trying to figure out why two identical sales cost different amounts.

The answer almost always comes down to one question: how is your processor's markup attached to the underlying cost of the card itself? Interchange plus pricing is the model that answers that question most transparently, and it is one of the structures Monument Payments may recommend within Traditional Processing when it fits your business. It is not automatically the right answer for everyone, and this article will help you understand when it is.

This article is general information, not legal or financial advice. Actual outcomes depend on your card mix, average ticket, and monthly volume, which is why Monument evaluates your statements before recommending any program. Where fee recovery is mentioned, note that rules vary by state, and Monument reviews compliance before recommending a fee recovery program.

TL;DR:

• Interchange is the wholesale fee set by card networks and paid to the bank that issues your customer's card. Your processor does not control it.
• Interchange plus pricing passes that true cost through to you, plus a fixed, disclosed markup you can actually see and audit.
• Flat rate is simpler but tends to overcharge you on low-cost cards. Tiered pricing is the hardest to review on your own.
• The right model depends on your volume, average ticket, and card mix. A free statement evaluation answers the question for your specific business.

What Interchange Actually Is (The Cost Nobody Sets)

Interchange is the wholesale fee that the card networks (Visa, Mastercard, Discover, and American Express) set and that gets paid to the bank that issued your customer's card. Your processor does not set it, cannot waive it, and passes it through on every transaction. Think of it as the cost of the card itself before anyone in the middle adds their fee.

Interchange vs. Assessments vs. Processor Markup

Every card transaction you accept carries three layers of cost:

1. Interchange goes to the bank that issued your customer's card.
2. Assessments go to the card networks themselves.
3. Processor markup goes to your payment processor.

Here is the part that matters when you are comparing quotes: your processor only controls one of those three layers. Interchange and assessments are the same for every processor working with the same card and the same transaction. The only real negotiating question is the markup. Separating these layers is the whole point of understanding a quote, because a processor that blurs them together can make its own margin look like an unavoidable cost of doing business.

Why Interchange Rates Vary Card to Card

Interchange differs based on practical factors you deal with every day: whether the card is debit, credit, or a rewards card; how you take it (dipped, tapped, swiped, keyed in, or accepted online); your business type; and the size of the transaction. A rewards business credit card taken over the phone costs more at the interchange level than a regulated debit card tapped at a terminal, for the same $100 sale. That is not your processor's choice. It is how the networks price risk and reward programs.

This is also why two identical sales on different days can carry different costs. If the Tuesday customer paid with a debit card and the Wednesday customer used a travel rewards card keyed in over the phone, the difference in your statement is real, not a billing error.

What Interchange Plus Pricing Means on Your Statement

Interchange plus pricing means your processor charges you the true interchange and assessment cost on each transaction, plus a fixed, disclosed markup. That markup is typically expressed as a percentage plus a small per-item fee, though some providers structure it differently. The defining feature is not the rate itself. It is transparency: on the statement, you can see what the card cost and what your processor added.

How a Pass-Through Line Item Reads

An interchange-plus statement is itemized. You will see interchange broken out by category, assessment lines listed separately, and a markup you can identify and check against your agreement. The contrast is the "one blended number" experience, where a single rate covers everything and you have no way to know what portion of your fees is the card's cost versus the processor's margin.

Here is a quick statement-reading test: if you cannot tell which portion of your fees is your processor's markup, you are probably not on interchange plus.

Where the Word "Plus" Trips People Up

Some owners hear "plus" and assume it means an extra fee tacked onto a rate. It does not. The "plus" refers to the processor's markup added on top of the pass-through cost of the card. You are paying interchange either way, on any pricing model. The question is whether you can see it. Also worth knowing: the industry uses "interchange plus" and "cost plus" loosely, and they generally mean the same principle.

Interchange Plus vs. Flat Rate vs. Tiered Pricing

These three models are really three ways processors attach their markup to the same underlying interchange cost. Understanding that frame makes comparing quotes much easier.

Flat-Rate Pricing (One Number, Less Visibility)

Flat rate charges a single percentage, often with a per-transaction fee, regardless of card type. The upside is simplicity: your cost per sale is easy to predict and quotes are easy to compare. The downside is that you overpay on low-cost cards, especially regulated debit, and you never see what you are actually being charged at the interchange level. Very small or brand-new businesses with low volume often do fine here because the simplicity is worth more than the savings they would gain.

Tiered Pricing (Qualified, Mid-Qualified, Non-Qualified)

Tiered pricing sorts transactions into buckets, usually labeled qualified, mid-qualified, and non-qualified. The problem is that the processor defines the buckets, and that is where margin hides. Transactions commonly "downgrade" into higher-cost tiers for reasons that are hard to audit from the statement. Of the three models, this is the hardest to review on your own, and the hardest to justify once you understand how it works.

Interchange Plus (Full Pass-Through, Auditable Markup)

Interchange plus is generally considered the most transparent structure, especially as your volume grows. The markup is fixed and visible, and when interchange costs are low, you benefit automatically instead of the savings staying with the processor. The honest trade-off: statements are longer and more detailed, and your total cost varies month to month with your card mix. Transparency means seeing the variation, not eliminating it.

Which Model Tends to Fit Which Business

As a general pattern: low-volume businesses with simple needs can do fine on flat rate. Growing retail, restaurant, B2B, and higher average ticket businesses generally benefit from interchange plus. Tiered pricing is difficult to defend once you can see what it is doing. But the real answer always depends on your card mix, average ticket, and monthly volume, which is exactly what a statement review reveals.

How to Evaluate a Quote or Statement (Statement Review Basics)

The Effective Rate Check

The simplest diagnostic is your effective rate: total processing fees for the month divided by total sales volume processed. Calculate it on your last three statements. Use it to compare quotes on equal footing and to spot drift over time. There is no single "good" number across industries, because a coffee shop and a furniture store have very different card mixes and average tickets. The value is in the comparison, not the absolute figure.

Questions to Ask Any Processor

• Is interchange passed through at true cost?
• What exactly is your markup, in writing?
• Are there monthly fees, statement fees, PCI fees, or early termination terms?
• Which pricing model is this quote, in plain terms?

For reference, Monument's published positioning on Traditional Processing includes a $25 flat monthly fee and no long-term contracts, details you can verify on the Monument Payments pricing page.

Red Flags That Suggest You're Overpaying

Watch for: unexplained downgrade categories, markup that appears to be buried inside the interchange column, quotes that show only one blended rate with no breakdown, and statements that seemingly require a salesperson to interpret them. None of these proves a problem, but each one makes it harder for you to know what you are actually paying.

When Traditional Processing on Interchange Plus Fits Your Business

Monument's Traditional Processing offering is built custom per business, and interchange-plus is one structure within it, alongside flat-rate and tiered, depending on what fits. Published positioning cites 10-15% savings versus typical statements and a $25 flat monthly fee, with no universal published rate because quotes are built to the business.

Business Profiles Where It Makes Sense

Interchange plus within Traditional tends to fit retail and restaurant operators with steady card volume who want predictable, auditable costs. It also fits businesses that want to keep card fees on their own books rather than pass them to customers, and businesses whose customer base would react badly to a surcharge or dual pricing display.

Why Monument Builds Traditional Quotes Custom

From a consultant's seat, the reason is simple: card mix, average ticket, entry method (POS, mobile, keyed, online), and industry risk all change the math. A universal rate quote is usually either padded to cover the worst case or wrong for your actual business. Monument works through an Evaluate, Recommend, Deploy, and Support process, starting with your statements, so the recommendation reflects how you actually get paid. Details are on the pricing page.

When Fee Recovery or ACH May Fit Better (Brief)

Dual Pricing and Cash Discount

Dual pricing displays a card price and a lower cash price. Monument's pricing page positions dual pricing and cash discount programs as recovering up to 100% of card processing costs, with tiered monthly plans by volume (Starter at $25 per month up to $5,000 in monthly volume, Growth at $50 for $5,000 to $10,000, and Enterprise at $75 for $10,000 and above). We cover the mechanics and comparison in a separate article.

Surcharging

Surcharging adds a disclosed fee to card transactions. Monument's published positioning cites 40-60% savings, with the credit fee disclosed and debit handled differently. Compliance rules vary, which is addressed briefly below. More detail is on the dual pricing and surcharging page.

ACH and eCheck for Larger or Recurring Invoices

For B2B, high-ticket, or recurring billing, ACH can make sense. Monument's pricing FAQ cites ACH transactions typically running $0.25 to $1.50 each, versus percentage-based card costs. We treat recurring billing, invoicing, and virtual terminal selection as separate topics for future articles.

Legality and Compliance (General Information, Not Legal Advice)

This section is general information, not legal advice. Rules for surcharging and dual pricing vary by jurisdiction and change over time, and card network rules also apply. Fee recovery programs generally carry disclosure, signage, and receipt requirements, and debit cards are treated differently from credit under surcharging rules. Monument reviews compliance before any fee recovery program is recommended or deployed, as part of the Evaluate and Recommend phases. Monument's site also lists PCI DSS Compliant positioning; we keep that to the published claim here.

How Monument Evaluates Your Current Processing

The evaluation starts with a free statement review and consultation. The recommendation may be Traditional Processing (interchange plus, flat rate, or tiered as fits), dual pricing or surcharging, or a mix. Then comes deployment and ongoing support. More on the Monument Payments approach, including the blog, is on the site.

What to Have Ready

Gather two to three recent merchant statements, a sense of your monthly volume and average ticket, and a clear picture of how you currently take payments: in person, online, keyed, or invoiced.

Local and Remote Support

Monument is based in Grand Junction on Colorado's Western Slope, with on-site deployment locally and remote support nationwide. The company has served businesses since 2014, with 500+ merchants served as claimed on the site, and works with operators across retail and restaurant POS environments.

Get a Free Evaluation of Your Interchange Plus Options

If you are unsure whether your current statement is interchange plus, flat rate, or tiered, a statement review answers that question quickly. Request your free evaluation at monumentpayments.com/pricing, or call (970) 239-1307.