Interchange-plus pricing charges the card network's interchange and assessment fees plus a fixed processor markup on top, with every layer itemized separately. For merchants processing meaningful monthly volume, especially with a debit-heavy or standard consumer-credit card mix, it typically can be more cost-effective and transparent than flat-rate pricing. The sections below walk through the math and the checklist to confirm it for your business.
TL;DR:
- Interchange rates are set by card issuers and vary greatly depending on card type, transaction method, and merchant category, with debit cards typically costing less than rewards credit cards.
- Network assessment fees are fixed percentages charged by Visa and Mastercard, while processor markups are negotiable and usually range between 0.20% and 0.50%, plus cents per transaction.
- Merchants processing above a few thousand dollars per month with a debit-heavy or standard credit card mix generally benefit most from interchange-plus pricing over flat-rate or tiered models.
- To lower costs within interchange-plus, merchants should leverage Level III data, encourage debit or ACH payments, and optimize authorization processes to avoid transaction downgrades.
- Requesting detailed, itemized processing statements and conducting direct comparisons with providers can reveal overpayment and help identify the most cost-effective processing setup.
Table of Contents
- How Interchange-Plus Pricing Works: Three Fee Layers
- Interchange-Plus vs Flat-Rate vs Tiered: Which Fits Your Business?
- How to Calculate Interchange-Plus Fees: A Worked Example
- What to Ask Processors Before Signing an Interchange-Plus Agreement
- Ways to Lower Your Effective Interchange Rate
- Network Offset Pricing in Practice: What Merchants Actually Save
- Our Take: Interchange-Plus Is the Right Default, Not the Whole Answer
- Get a Real Cost Comparison From PaySec
- Sources
- FAQ
How Interchange-Plus Pricing Works: Three Fee Layers
Every interchange-plus transaction breaks into three distinct charges, and understanding each one is what lets you actually negotiate instead of just accepting a quote.
Interchange is set by the card issuer, not your processor. Visa and Mastercard publish interchange tables that vary by card type, merchant category, and whether the card was swiped, tapped, or keyed in online. A debit card usually carries a much lower interchange rate than a rewards credit card, which is why card mix drives your effective processing cost more than any other single factor.
Network assessments come next. Visa and Mastercard each charge a small percentage fee for running the network itself, regardless of who issued the card.
Processor markup, the "plus" in interchange-plus, is the only piece your processor actually controls and the only piece open to negotiation.
A properly formatted statement shows these as three separate line items rather than one blended rate. That structure is the whole point of the model: it turns a black box into a spreadsheet.
- Interchange: issuer-set, varies by card type and transaction method
- Assessments: network-set, roughly the same across processors
- Markup: processor-set, negotiable, typically 0.20% to 0.50% plus a few cents per transaction
Markup benchmark: competitive interchange-plus markups for small-to-medium merchants generally run 0.20% to 0.50% plus a small per-transaction fee. Anything meaningfully higher deserves a follow-up question.
Interchange-Plus vs Flat-Rate vs Tiered: Which Fits Your Business?
The three pricing models differ mainly in how much of the true cost they hide.
Flat-rate pricing charges one blended percentage, say 2.9% plus $0.30, no matter what card the customer uses. It's predictable and easy to understand, which is exactly why it appeals to businesses processing a low volume or running one-off sales where simplicity beats savings.
Tiered pricing groups transactions into "qualified," "mid-qualified," and "non-qualified" buckets, often obscuring which cards land where and why. This is where the phrase qualified vs non-qualified rates comes from, and it's also where processors have historically padded margins by quietly reclassifying transactions into pricier tiers.
Interchange-plus pricing passes through the actual interchange and assessment costs, then adds a disclosed markup. Merchants processing above roughly a few thousand dollars a month, particularly with debit and standard credit volume, usually come out ahead compared to flat-rate or tiered pricing vs interchange plus arrangements.
- Flat-rate: best for very low volume or seasonal sellers who value simplicity
- Tiered: rarely the best choice, mostly used by legacy processors
- Interchange-plus: best for consistent, moderate-to-high volume merchants who want true cost pricing
If your monthly card volume is climbing, that comparison is worth revisiting every year. Rate tables shift, and so does your card mix.
How to Calculate Interchange-Plus Fees: A Worked Example
Here's the math on a $10 sale, using representative rates:
- Interchange: 1.80% + $0.20 = $0.18 + $0.20 = $0.38
- Network assessment: 0.20% = $0.02
- Processor markup: 0.50% + $0.10 = $0.05 + $0.10 = $0.15
- Total fee: $0.38 + $0.02 + $0.15 = $0.55
That $0.55 works out to a 5.5% effective rate on this single transaction, though real-world blended rates run much lower once you average across hundreds of transactions with different card types.
Monthly projection: multiply your average effective rate by total monthly card volume. Process tens of thousands of dollars a month at a typical blended rate and you're looking at processing costs proportionate to your volume and rate.
Your statement won't show the same percentage every month, and that's normal. A holiday surge in rewards-card spending, a shift toward more debit transactions, or a new B2B client paying by corporate card all move the blended number. Interchange-plus makes that variation visible instead of hiding it inside a flat rate.
What to Ask Processors Before Signing an Interchange-Plus Agreement
Comparing quotes apples-to-apples requires more than a rate sheet. Ask for these specifically:
- Actual processing statements covering the last 90 days, not a sample or estimate
- Written markup disclosure, stated as a percentage plus cents, not buried in a tiered structure
- Monthly fee schedule, including PCI compliance fees, gateway fees, and statement fees
- Chargeback handling terms, including dispute fees and response timelines
- Contract length, since some processors still lock merchants into multi-year terms with early termination penalties
Pro Tip: Ask the processor to walk through last month's statement line by line, in a call. If they can't explain a single fee without checking with someone else, that's your answer about how transparent they really are.
Watch for these red flags: statements that blend interchange into one number instead of itemizing it, refusal to share sample statements before you sign, and markups noticeably above the 0.20% to 0.50% benchmark without a clear justification. A comparison of pricing models side by side, using your own statements, remains the most reliable way to catch these issues before they cost you months of overpayment.
Ways to Lower Your Effective Interchange Rate
Interchange-plus gives you visibility into your fees. The next step is using that visibility to actually cut them.
Level III data is the biggest lever for B2B and larger-ticket transactions. Adding line-item detail like tax amount, product codes, and quantity to a transaction can qualify it for a lower interchange tier on B2B and card-not-present sales, sometimes cutting that transaction's interchange substantially.
Shifting card mix helps too. Offering ACH for recurring billing, or a small incentive for debit over credit, nudges customers toward payment methods that carry lower interchange.
Better authorization and data capture at the point of sale reduces the odds of a transaction downgrading into a higher, non-qualified rate.
- Enable Level III data capture for B2B and government transactions
- Offer ACH as a default for recurring subscription billing
- Audit your authorization settings for AVS and CVV matching
- Consider a network offset approach for higher-volume accounts
Merchants who combine these tactics with a well-negotiated markup are the ones who see the biggest gap between their old statement and their new one.
Network Offset Pricing in Practice: What Merchants Actually Save
Basic interchange-plus negotiation gets most merchants a fair markup. For merchants with meaningful volume across SaaS, restaurants, eCommerce, healthcare, or CBD retail, an advanced optimization layer can go further.
PaySec's Network Offset Pricing applies structured pricing techniques on top of an interchange-plus foundation, and clients across 18-plus industries have reported processing cost reductions of 30% to 60%, with one documented case showing a 42% reduction.
Merchants evaluating a shift from basic interchange-plus to a network-offset model should treat it as a volume-driven decision: the more consistent your monthly processing, the more a structured optimization program has to work with.
Consider this approach once your monthly volume is high enough that even small percentage gains translate into real dollars, or once B2B transactions make Level III optimization worth the setup effort.
- Applies on top of interchange-plus, not instead of it
- Most relevant for merchants above a few thousand dollars in monthly volume
- Works alongside real-time transaction reporting for ongoing visibility
Our Take: Interchange-Plus Is the Right Default, Not the Whole Answer
Interchange-plus pricing is the right default for most qualifying merchants because it makes the true cost visible instead of averaging it away. But visibility alone doesn't cut your bill. If your monthly volume is significant or a meaningful share of it is B2B, the smarter move is pairing interchange-plus with active optimization, starting with a straight comparison of your last few months of statements against a modeled quote.
— PaySec Marketing Team
Get a Real Cost Comparison From PaySec
A payment processing provider built around the criteria this article just walked through offers itemized statements, disclosed markups, and real-time reporting instead of a blended number you have to trust blindly. With no monthly minimums and no long-term contracts, there's nothing standing between your current statement and a clearer one.
If you're processing meaningful volume in SaaS, restaurants, eCommerce, healthcare, or CBD retail, PaySec's merchant services team can model your true cost using your own transaction history.
- Request a cost comparison using your last 90 days of statements
- Review documented case studies showing 30% to 60% savings across industries
- Ask about Network Offset Pricing if your volume or B2B mix is substantial
Start by sending over your current statements. That single step is usually enough to show whether you're overpaying.
Sources
- Credit Card Processing Fees: A 2026 Guide for Businesses - NerdWallet
- How are Interchange Plus (IC+) fees calculated? — Toast support
FAQ
What Is Interchange Plus Plus (IC++) Pricing?
IC++ typically refers to interchange-plus-plus, a variant common in some payment facilitator setups where a third layer, often a gateway or platform fee, sits alongside interchange, assessments, and processor markup. The core structure is the same as standard interchange-plus, just with an added fee layer disclosed separately.
How Much Does Interchange Typically Cost?
Interchange rates vary by card type and transaction method, with debit transactions generally costing less than premium rewards credit cards. There's no single flat number since issuers set hundreds of different rate categories.
Why Are Interchange Fees So High?
Interchange funds card issuer costs like fraud protection, rewards programs, and the risk of extending credit, which is why rewards cards carry higher interchange than basic debit cards. The rate isn't set by your processor, so it can't be negotiated the way markup can.
How Can I Avoid High Interchange Fees?
You can't eliminate interchange entirely, but you can lower your effective rate through Level III data optimization, encouraging debit or ACH payments, and improving transaction data capture to avoid downgrades. Advanced approaches like PaySec's Network Offset Pricing can push savings further for qualifying merchants.
Is Interchange-Plus Always Cheaper Than Flat-Rate?
Not always. Merchants with very low or inconsistent volume, generally under a few thousand dollars a month, sometimes do better with flat-rate's simplicity, while higher-volume merchants with a debit-heavy card mix usually save more under interchange-plus.