Most small business owners processing cards through Stripe or Square have no idea what their effective rate actually is. They see the headline number (2.6% plus 10 cents, or 2.9% plus 30 cents) and assume that's just the cost of doing business. It isn't. That flat rate is a margin your processor built on top of what the card networks actually charge, and at meaningful volume, that margin compounds into real money walking out the door every month.
If you're newer to how card payments work (who the six players are, what authorization vs. settlement means, why two-second approvals take two days to deposit), the payment processing explainer covers all of that before getting into pricing. This post assumes you know the basics and focuses on the one thing you can actually negotiate.
For businesses at meaningful volume, few things hit the bottom line as directly as how their processing is priced. It's not complicated once you see how the layers stack. It also helps to know whether you're working with a merchant services provider or a payment service provider — the relationship you're in determines which pricing models you qualify for.
TL;DR: Interchange is the wholesale fee the card networks charge on every transaction. Your processor adds their markup on top. Flat-rate hides that markup in a blended percentage; interchange-plus shows it as two separate lines. At $10,000/month in card volume, the difference is roughly $75/month. At $50,000/month, it's $375. The math only gets better from there.
What Is Interchange, and Why Can't Your Processor Change It?
Interchange is the wholesale fee the card networks charge the merchant's bank on every card transaction. Rates are set by Visa and Mastercard, not your processor, and run from regulated debit at the low end to 2.65% or higher for corporate purchasing cards. The debit floor is not a network decision at all: under the Federal Reserve's Regulation II, an issuer with $10 billion or more in assets may not take more than $0.21 plus 0.05% of the transaction, plus a $0.01 fraud-prevention adjustment where eligible. That is why regulated debit is the cheapest card you can accept, and why a card mix heavy in debit changes your economics more than any negotiation will. Your processor cannot change any of these rates; they only control their markup on top of them.
Every time a customer swipes, dips, or taps a credit card, the card network (Visa, Mastercard, Discover, or Amex) charges the merchant's bank a fee to compensate the cardholder's bank. That fee is interchange.
Visa and Mastercard publish their interchange tables publicly. They run hundreds of rate categories, and the rate you pay on any given transaction depends on a specific set of variables: the card type (basic debit, rewards credit, business card, premium card), the merchant category code assigned to the merchant's account, how the card was accepted (in-person chip, keyed-in, card-not-present), and whether the transaction data was submitted correctly.
A basic consumer debit card might clear at 0.05% plus $0.22. A premium travel rewards credit card might run 2.3% plus $0.10. Business cards, especially corporate purchasing cards, can hit 2.65% or higher. The average across all card types for most merchants lands somewhere between 1.5% and 2.0%.
The critical point: interchange rates are set by Visa and Mastercard, not by your payment processor. Your processor does not control them. What your processor controls is the markup they charge on top of interchange, and that's where the business model diverges sharply between pricing structures. For a full glossary of every fee category on your statement — including assessments, FANF, APF, NABU, chargeback fees, and processor-only fees — see merchant services fees explained. If you specifically take phone or email orders, virtual terminal pricing covers how the MOTO interchange tier works and what it costs against flat-rate keyed-entry pricing.
How Does Flat-Rate Pricing Work, and Who Does It Actually Benefit?
Stripe's published online rate is 2.9% plus $0.30 per transaction. Square's published in-person rate is 2.6% plus $0.15, raised from $0.10 in February 2025. Shopify Payments publishes 2.4%–2.9% plus $0.30 and adds a 0.5%–2.0% charge if you route through any other processor, which makes a third-party processor more expensive on the lower Shopify plans. All three figures are from those companies' own published pricing pages, checked July 2026; flat-rate card pricing changes without much notice, so confirm current rates before you build a comparison on them. For a full breakdown of that surcharge structure, see Shopify Payments vs a dedicated merchant account. These numbers are clean and predictable. You always know what you'll pay. For a detailed breakdown of what Square's flat-rate pricing actually costs at real merchant volume, see the Square Issuing V2 fee review. If you're on a Clover or Square POS and considering switching, there's an additional cost most merchants overlook: POS hardware lock-in explains what your existing equipment is worth the moment you leave. If you haven't picked between the two yet, Clover vs Square covers the rate structures and contract differences before you commit to hardware.
What you don't see is what's underneath. Flat-rate processors collect the blended average of your interchange costs, pocket the spread between what the card networks actually charged and what they charged you, and keep the difference. When you run a cheap debit card transaction through Stripe, Stripe makes a lot of money. When a customer pays with an Amex Platinum, Stripe makes less, or sometimes barely breaks even. The model is designed to average out in the processor's favor across your entire card volume.
For very low-volume businesses (say, under $5,000 per month), this is genuinely fine. The simplicity is worth something, and the math doesn't hurt enough to care. But the crossover point comes fast. Once you're processing $15,000 to $20,000 per month in card volume, the spread the flat-rate processor is collecting on your cheap transactions is real money.
For high-ticket industries like construction, landscaping, or specialty services where single transactions can run $5,000 to $50,000, the flat-rate model is particularly punishing. You're paying 2.6% or 2.9% on transactions that would clear at interchange rates well below 2%.
How Does Interchange-Plus Pricing Work, and What Does It Cost at Real Volume?
Interchange-plus pricing passes the actual wholesale card cost through to the merchant and adds a fixed, disclosed processor markup, typically interchange plus 0.20% plus $0.10 per transaction. The markup stays constant regardless of card type. When interchange rates drop, merchants benefit automatically. Businesses processing $15,000+/month almost always pay less under interchange-plus than under flat-rate.
Interchange-plus (also called "cost-plus" or "pass-through" pricing) does exactly what the name says: you pay the actual interchange rate for each transaction, plus a fixed markup that goes to your processor.
A typical interchange-plus structure looks like this: Interchange + 0.20% + $0.10 per transaction
That means on every charge, you pay whatever Visa or Mastercard charged the acquiring bank, then your processor adds their flat markup on top. The interchange varies by card type; your processor's cut does not.
The Real Math: $10,000 in Monthly Volume
Let's say you're a local retailer processing $10,000/month. Assume a blended interchange rate of 1.65%, a realistic mix of debit and basic credit cards, with an average ticket of $85 and about 118 transactions per month.
Flat-rate at 2.6% + $0.10:
- 2.6% of $10,000 = $260
- 118 transactions × $0.10 = $11.80
- Total: $271.80/month
Interchange-plus at 1.65% + 0.20% + $0.10:
- 1.65% interchange on $10,000 = $165
- 0.20% processor markup = $20
- 118 transactions × $0.10 = $11.80
- Total: $196.80/month
That's $75 per month in savings, or $900 per year, on just $10,000/month in volume.
The Real Math: $50,000 in Monthly Volume
Now scale to a business doing $50,000/month: a solid restaurant, a regional services company, or a mid-sized retailer. Same blended interchange rate, roughly 588 transactions.
Flat-rate at 2.6% + $0.10:
- 2.6% of $50,000 = $1,300
- 588 transactions × $0.10 = $58.80
- Total: $1,358.80/month
Interchange-plus at 1.65% + 0.20% + $0.10:
- 1.65% interchange on $50,000 = $825
- 0.20% processor markup = $100
- 588 transactions × $0.10 = $58.80
- Total: $983.80/month
That's $375 per month, or $4,500 per year staying in your account instead of subsidizing your processor's margins. Pair that with tighter cash flow management through next-day funding and the cumulative impact on working capital is significant.
Cost Comparison at Scale
The pattern holds at every volume level. The table below uses the same assumptions: 1.65% blended interchange, 0.20% processor markup, $0.10 per transaction, $85 average ticket.
| Monthly Volume | Flat-Rate (2.6% + $0.10) | Interchange-Plus* | Monthly Savings | Annual Savings |
|---|---|---|---|---|
| $10,000 | $271.80 | $196.80 | $75 | $900 |
| $20,000 | $543.50 | $393.50 | $150 | $1,800 |
| $50,000 | $1,358.80 | $983.80 | $375 | $4,500 |
| $100,000 | $2,717.60 | $1,967.60 | $750 | $9,000 |
*Interchange-plus at 1.65% blended + 0.20% markup + $0.10/transaction. Your blended interchange rate varies by card mix: businesses with more debit volume save more; businesses with premium travel rewards cards save less.
Which Businesses Benefit Most From Switching to Interchange-Plus?
Interchange-plus pricing becomes the right call when three conditions exist.
Volume is meaningful. Below $5,000/month, the savings don't justify the additional complexity. Above $15,000/month, you're almost certainly paying too much on flat-rate.
Your card mix skews toward debit or basic credit. If most of your customers pay with debit cards or standard consumer credit cards, your blended interchange is probably 1.4% to 1.8%. A flat-rate processor at 2.6% pockets the difference on every cheap transaction. Interchange-plus passes those savings directly to you.
You run higher average tickets. High-ticket transactions are where the flat-rate premium really stings. A $5,000 transaction on flat-rate at 2.6% costs $130 in fees. The same transaction at interchange (assume 1.8%) plus a 0.20% markup costs $100. Save $30 on a single charge. Multiply that across monthly volume.
Businesses that tend to see the biggest gains: restaurants, specialty retailers, contractors and trades, medical practices, auto dealers, and any B2B operation taking corporate cards. If you're running an online store specifically, our e-commerce payment processing setup guide covers how to pair interchange-plus with the right gateway and checkout configuration.
One pattern we see consistently in our portfolio: the merchants who gain the most from switching are those who had been on flat-rate with a processor that also handles their invoicing software. A roofing contractor in our portfolio had been processing through QuickBooks Payments for years. When the switch happened, the first interchange-plus statement made the savings concrete: interchange listed by card category, the processor markup as a flat 0.20% line, and a total that came back $300–$400 lower than the prior month on identical volume. It's one thing to show the math in a table. It's another to see it on your own statement.
How Do You Read an Interchange-Plus Statement?
An interchange-plus statement itemizes every interchange category separately. Each line shows the card type, number of transactions, volume, and the exact rate the card network charged. Your processor's markup appears as a separate, fixed line. If your statement shows only "qualified," "mid-qualified," and "non-qualified" tiers instead of individual interchange categories, you're on tiered pricing, not interchange-plus.
One underrated benefit of interchange-plus is statement clarity. Your monthly statement itemizes every interchange category that hit your account, the rate for each, and your processor's fixed markup sitting separately on top. Nothing is blended or hidden.
Here's what to look for:
Interchange detail section: Each line shows a card category (like "Visa CPS Retail," "MC World Elite," or "Visa Debit"), the number of transactions that qualified, the volume, and the rate charged. This tells you exactly what the card networks collected.
Processor markup line: This should be a flat, consistent percentage plus a per-transaction fee. If it isn't flat and consistent, it's not pure interchange-plus. It may be a tiered structure dressed up with interchange-plus language.
Qualified vs. non-qualified: Watch for any "non-qualified" or "mid-qualified" categories. These appear when transaction data wasn't submitted correctly or when certain card types don't fit the standard flow. A good processor helps you minimize these through proper setup.
If your statement doesn't show individual interchange categories, you're likely on tiered pricing, not interchange-plus, regardless of what you were told at signup.
How Do You Switch From Flat-Rate to Interchange-Plus?
Switching is simpler than most merchants expect. The main steps are finding a processor who offers interchange-plus with a dedicated merchant account, completing underwriting (typically 1–3 business days for standard-risk categories), and transitioning your payment terminal or gateway to the new account.
The part that takes the most planning is terminal compatibility. If your current hardware is leased through your processor, you may face early termination fees. If you own it outright, most terminals can be reprogrammed for a new merchant ID. The POS hardware lock-in guide covers this in detail.
For online merchants, switching gateway credentials takes a few hours and can often happen without any visible downtime for customers. For brick-and-mortar operations, plan for a brief switchover window (typically an evening or weekend) when the terminal is being reprogrammed.
What doesn't require switching: your business bank account, your invoicing software (in most cases), or your customer relationships. You're changing the processor, not the plumbing.
A few things to confirm before committing to a new processor: month-to-month contract terms (no multi-year lock-in), statement format (can you actually see the interchange categories listed?), and what happens to transaction history from your prior processor (you keep it, but you may need to export it before closing the old account).
If you're unsure whether the numbers justify switching at your current volume, get a free rate comparison from ClickWerxs. We'll run your actual card volume through both models and show you the specific monthly difference before you make any commitment.
Processing fee ranges reflect publicly available interchange schedules from Visa, Mastercard, Amex, and Discover as of 2025–2026. Your actual effective rate will vary based on card mix, transaction method, monthly volume, and processor markup. This post is for informational purposes only and does not constitute financial or legal advice.
Frequently Asked Questions
Is interchange-plus pricing available to small businesses?
Yes, though some processors historically reserved it for higher-volume merchants. At ClickWerxs, interchange-plus is available regardless of volume, because the pricing model itself is simply more honest. Businesses at lower volume may save less in absolute dollars, but they still benefit from full cost transparency.
How does interchange-plus compare to tiered pricing?
Tiered pricing is the structure to avoid. Your processor buckets transactions into three tiers (qualified, mid-qualified, and non-qualified) and assigns different rates to each. The processor decides what tier each transaction falls into, which creates an obvious incentive to downgrade transactions to higher-cost tiers. Interchange-plus eliminates this entirely because your processor's markup is fixed regardless of card type.
Does my card mix affect how much I save?
Significantly. Businesses that accept a lot of debit cards or basic consumer credit cards will see the largest savings because interchange on those cards is low. Businesses with customers who predominantly use premium rewards cards will see smaller relative savings because the interchange on those cards is already high.
Are there downsides to interchange-plus?
The main one is statement complexity. Flat-rate gives you one number. Interchange-plus gives you a detailed breakdown that takes some familiarity to read correctly. It's also worth noting that proactive chargeback prevention matters more with interchange-plus, because chargebacks that downgrade to higher interchange categories can affect your blended cost.
Can I negotiate the interchange-plus markup?
The interchange itself is non-negotiable: Visa and Mastercard set it. Your processor's markup is negotiable, and volume is what gives you room to negotiate. If you're at $50,000/month and your processor's markup is still 0.50% or higher, you have room to push. For a complete breakdown of which fees you can negotiate and which are fixed by the card networks, see 6 merchant account fees you can negotiate (and 4 you can't).
The payment processing industry has made a business out of opacity. Flat-rate pricing is straightforward to understand, easy to market, and profitable for the processor at the expense of the merchant. Interchange-plus inverts that: you see exactly what the card networks charge and exactly what your processor takes.
At $20,000/month in volume, the difference between flat-rate and interchange-plus is typically $150 to $300 per month. At $100,000/month, you're talking $750 to $1,500 monthly. These aren't rounding errors.
For businesses looking to reduce fees further, crypto payment processing runs at 0.5–1% per transaction, below even the best interchange-plus effective rates, with the added benefit of zero chargebacks on those transactions. For B2B invoices specifically, ACH fees are capped at $5–$10 per transaction regardless of invoice size, which changes the math entirely on payments above $500.
Before comparing pricing structures, it helps to understand why your fees are high in the first place: who's collecting each layer, and where the markup lives. For subscription businesses specifically, keeping your per-transaction cost low is only part of the equation. Recovering failed payments through smart dunning is the other lever most subscription merchants overlook.
The benchmarks we use when we model this for a merchant are the ones coded into our own savings calculator: average credit interchange of 1.81% plus $0.10 per transaction, drawn from Motley Fool and Kansas City Fed data, and regulated debit at 0.05% plus $0.21 under Regulation II. Interchange is the wholesale floor, not your total cost, so anything a processor quotes below that number is either excluding fees or misreading your card mix.
If you don't know what your current effective rate is, that's worth finding out. Get a free rate comparison at ClickWerxs and see exactly what you're paying versus what you should be. See the full picture of what transparent payment processing looks like before you decide.
Sources
- Federal Reserve Board, Regulation II debit card interchange fee standard — a covered issuer (generally $10 billion or more in total assets) may not receive more than $0.21 plus 0.05% of transaction value, plus a $0.01 fraud-prevention adjustment where eligible. Government-administered and certain reloadable prepaid programs are exempt. federalreserve.gov
- Flat-rate processor pricing — Stripe 2.9% + $0.30 online; Square 2.6% + $0.15 in person, raised from $0.10 in February 2025; Shopify Payments 2.4%–2.9% + $0.30 with an additional 0.5%–2.0% charge for third-party processors. Taken from each company's published pricing page, checked July 2026. Rates change without notice; verify before relying on them.
- ClickWerxs savings calculator coded assumptions — average credit interchange 1.81% + $0.10 per transaction (Motley Fool / Kansas City Federal Reserve) and regulated debit 0.05% + $0.21 per transaction (Federal Reserve Regulation II). First-party operator data; interchange is a wholesale component, not a total processing cost.
ClickWerxs facilitates merchant account applications and provides ongoing account management as an authorized representative of our banking and processing partners. Approval, rates, and terms are determined by the issuing processor and acquiring bank — ClickWerxs does not guarantee approval for any merchant account application. Processing rates and fee structures cited in this post reflect publicly available industry data and general ranges; your actual rate depends on your industry, volume, and card mix. This post is not legal or financial advice. For a custom quote, see clickwerxs.com/payments/get-a-quote.
Competitor pricing cited in this post is from publicly published pricing pages as of the date noted and is subject to change. ClickWerxs is not affiliated with the companies mentioned.
Kaleb Dickhaut — Founder, ClickWerxs. Kaleb built ClickWerxs from the ground up, from payment processing ISO to the Command Center platform to the AI SEO methodology the blog runs on. He has onboarded hundreds of small businesses onto payment and CRM systems. linkedin.com/in/kaleb-dickhaut