The three parts of a processing fee
Every credit card transaction moves through the same chain: the customer's card-issuing bank, the card network (Visa, Mastercard, Amex, Discover), and your processor. Each party takes a cut. When you see "2.6% + 10¢" on a Square statement or "interchange plus 0.25% + 10¢" on a traditional merchant account, those numbers bundle or unbundle the three parts.
| Component | Paid to | Typical size | Negotiable? |
|---|---|---|---|
| Interchange | Card-issuing bank | 1.4%–2.1% + 5–15¢ | No (pass-through) |
| Assessments | Card network (Visa/MC/etc.) | ~0.13%–0.17% | No (pass-through) |
| Processor markup | Your processor / ISO | 0.20%–0.50% + 5–15¢ | Yes |
Roughly 75–85% of what a typical merchant pays is non-negotiable pass-through. The remaining 15–25% is processor margin. That's the whole game: understand which part is which, then negotiate only the part that can actually move.
Interchange: the part nobody sees
Interchange is what your customer's bank charges the card networks to authorize and settle the transaction. Visa and Mastercard publish interchange rate schedules that update twice a year (April and October). The rate depends on the card type, the way the card was presented (swipe / chip / tap / keyed / online), the transaction amount, and the merchant category code (MCC).
Rough interchange bands to set expectations:
- Regulated debit (big-bank debit cards): ~0.05% + 22¢ under the Durbin Amendment cap. The cheapest interchange.
- Standard credit: 1.50%–1.90% + 10–15¢ depending on MCC.
- Rewards credit: 1.90%–2.30% + 10–15¢. Premium rewards (Amex Platinum, Chase Sapphire Reserve) sit at the top of the range or above.
- Commercial / corporate cards: 2.30%–2.95% + 10–15¢. Much higher than consumer credit.
- Card-not-present / keyed: Adds 20–50 basis points across all card types because of fraud risk.
You can't negotiate interchange. What you can do is see it honestly. On interchange-plus pricing it's a separate line. On flat-rate pricing it's bundled into one number that hides the differences.
Assessments: the network's cut
Assessments are what Visa, Mastercard, Amex, and Discover charge for running the payment network. They're small (0.13%–0.17% of volume plus per-brand dues) and they're non-negotiable. You'll see them on an interchange-plus statement as line items like "Visa Assessment" or "MC NABU" (Network Access and Brand Usage fee).
Assessments plus interchange together are called "wholesale cost" or "cost of goods" in the processing industry. That's the actual floor on what you can be charged.
Processor markup: the only negotiable piece
Your processor's markup is the one part of the transaction that varies by who you signed with and how hard you shopped. On interchange-plus pricing, the markup is a single percentage plus a per-transaction fee, stated in writing. On flat-rate or tiered pricing, the markup is hidden inside the blended rate.
Typical markup ranges on interchange-plus:
- Competitive: 0.20%–0.35% + 5–10¢. Small to mid-sized merchants with healthy volume.
- Average: 0.35%–0.50% + 10–15¢. Typical ISO pricing for new accounts.
- High: 0.50%–1.00% + 15¢+. Merchants who never negotiated or are in high-risk categories.
- Not interchange-plus: anything above 1.00% markup. At that point you're paying flat-rate or tiered dressed up with an IC+ label.
Ask any processor for the markup in writing before you sign. A quote that won't separate the markup from interchange is a quote to walk away from.
Pricing models: flat-rate, tiered, IC+, subscription
Four pricing models dominate the market. Most comparison articles cover two. Here's all four honestly.
| Model | How it works | Best for | Biggest drawback |
|---|---|---|---|
| Flat-rate | One blended % + per-txn fee across all card types (e.g. Square 2.6% + 10¢) | Under $5K/mo; event-based; brand-new businesses | You silently absorb interchange differences on premium cards |
| Tiered (qualified / mid / non-qualified) | Transactions bucketed into tiers; each tier has its own rate | Almost nobody — this is legacy pricing | Tiers are processor-defined; most rewards + keyed cards downgrade to most expensive tier |
| Interchange-plus (IC+) | Actual interchange + fixed markup, both shown separately | $10K+/mo; card-present majority; merchants who want transparency | Statements are longer and take getting used to |
| Subscription / membership | Monthly subscription fee + interchange at true cost + small per-txn fee | Steady-volume merchants above ~$25K/mo; predictable ticket sizes | Seasonal businesses pay the subscription in slow months |
For a focused side-by-side of the two most common models with worked dollar math and card-mix break-even analysis, see Interchange-Plus vs Flat-Rate.
Cost example at $5K, $20K, and $50K monthly volume
Same assumptions every column: card-present majority, mixed rewards and debit, average ticket $35. Flat-rate at Square's headline 2.6% + 10¢. Interchange-plus at 1.95% effective (0.35% markup + 1.60% blended interchange + 5¢ per-transaction + $15/mo statement fee).
| Line | $5K/mo | $20K/mo | $50K/mo |
|---|---|---|---|
| Transactions (~$35 ticket) | ~143 | ~571 | ~1,429 |
| Flat-rate total | $130 + $14.30 = ~$144 | $520 + $57.10 = ~$577 | $1,300 + $142.90 = ~$1,443 |
| Interchange-plus total | ~$97 + $7 + $15 = ~$119 | ~$390 + $29 + $15 = ~$434 | ~$975 + $71 + $15 = ~$1,061 |
| Monthly difference | ~$25 (IC+ wins) | ~$143 (IC+ wins) | ~$382 (IC+ wins) |
| Annualized | ~$300 | ~$1,716 | ~$4,584 |
Illustrative calculations on published rates, not quotes. Your actual cost depends on your card mix, average ticket, card-not-present share, and your specific interchange-plus markup.
At $5K/mo the numbers are close enough that Square's zero monthly fee and simplicity often still win. At $20K/mo the gap is meaningful. At $50K/mo the gap compounds into real money. And if your card mix runs heavy on premium rewards cards, the gap widens further because flat-rate absorbs the premium interchange as margin. Run your own numbers on the fee calculator or upload a statement to the statement analyzer to see your real numbers.
The junk-fee catalog
Beyond the three legitimate components, most processors layer on a stack of small fees that add up to real money over a year. Some have a legitimate pass-through cost; most don't. Here are the ones to scan for.
| Fee | Typical range | Legitimate? |
|---|---|---|
| PCI non-compliance fee | $20–$125/mo | Only if you are actually non-compliant; almost always removable |
| Monthly statement fee | $5–$15/mo | Semi-legitimate (covers admin); often negotiable |
| Batch / settlement fee | 5–25¢ per batch | Under 10¢ is legitimate; over that is margin |
| Regulatory / network "recovery" fee | $5–$25/mo | None. Pure margin; ask to remove |
| Monthly minimum | $15–$50/mo | Triggered when you don't hit a volume threshold; often negotiable |
| Annual membership / PCI report fee | $50–$300/yr | Sometimes legitimate if there's a real compliance service behind it; otherwise margin |
| Terminal lease | $40–$99/mo × 48 months | Almost never. Typically costs 4–6× what the hardware would cost to buy outright |
| IRS / 1099-K reporting fee | $5–$25/yr | Processor is required to file; charging you for it is a margin item |
| Early termination fee (ETF) | $100–$595 one-time | Valid as a contract term, but avoidable by signing month-to-month |
| Chargeback fee | $15–$50 per chargeback | Legitimate; covers actual processing; amount varies by processor |
| Gateway fee (e-commerce) | $10–$30/mo + per-txn | Legitimate if you use the gateway; negotiable amount |
For the full junk-fee deep dive with instructions on how to spot each one on a real statement and how to remove it, see Hidden Fees in Credit Card Processing.
Your effective rate (the one number that matters)
Every processor claims they have the lowest rates. Every one. The only number that cuts through that is your effective rate: total fees divided by total card volume, expressed as a percentage. It includes everything — the discount rate, the per-transaction fees, the junk fees, the monthly statement fee. It's the honest total-cost number.
Benchmarks for small to mid-sized merchants:
- Under 2.0%: Highly competitive. You're probably already on interchange-plus with a tight markup.
- 2.0%–2.5%: Competitive for card-present small merchants. Still worth reviewing for junk fees.
- 2.5%–3.0%: Average for flat-rate plans. Usually room to save on interchange-plus above $10K/mo volume.
- 3.0%–3.5%: High. Either flat-rate with unfavorable card mix, tiered pricing, or interchange-plus with junk-fee stacking.
- Above 3.5%: Something is off. Check for terminal leases, stacked junk fees, or non-compliant tiered pricing.
Upload any processor statement to the statement analyzer to see your effective rate, every line-item fee categorized, and flagged junk charges. No signup.
How to audit your own fees (7-step checklist)
The same seven steps a good ISO agent would run on your behalf. Takes about an hour.
Pull the last 3 months of processing statements
Three months captures enough volume variance to compute a stable effective rate. Download the statements as PDFs from your processor portal. If your processor makes statements hard to find, that's signal by itself.
Calculate your effective rate
Sum total processing fees for the three months. Sum total card volume for the same period. Divide fees by volume. Multiply by 100. The result is your effective rate as a percentage. The statement analyzer does this in seconds, or you can do it manually with three numbers.
Separate interchange + assessments from processor markup
Interchange and assessments are pass-through; the processor's discretionary margin is everything else. On an interchange-plus statement this is already separated. On a flat-rate or tiered statement you'll have to estimate interchange (typically 1.4–2.1% depending on card mix) and back into the markup.
List every fee by line item
Write down every distinct fee on your statement: discount rate, per-transaction fee, monthly fee, batch fee, statement fee, PCI fees, regulatory recovery, annual fees, gateway, terminal lease. Match each line to the three categories from step 3 or flag as suspect.
Flag anything over the market range
PCI non-compliance above $20/mo, batch fees over 10¢, regulatory recovery fees, terminal lease payments above the hardware's replacement cost, monthly minimums above $25, and any fee labeled “compliance” or “recovery” deserve a question. These are the categories most likely to be pure margin.
Request an interchange-plus quote in writing from a competitor
Ask for percentage-over-interchange plus per-transaction fee, monthly fee, contract length, and ETF amount. Get it in writing. Typical markup is 0.20–0.50% + 5–15¢. If anyone quotes higher than 0.50% markup, keep shopping.
Have the conversation with your current processor
Call with the statement, the effective rate, the flagged fees, and the competing quote. Ask directly: can you match the quote, and will you remove the flagged fees. The answer is often yes if they think they’ll lose the account. If not, the competing quote is your next move.
A note on Florida and Central Florida merchants
Three Florida-specific fee realities worth factoring in:
- Cash discount pricing is legal and documented. Florida Statute 501.0117 was ruled unconstitutional in 2015, and properly-structured cash discount programs have been network-permitted since the 2013 antitrust settlement. For Orlando and Kissimmee merchants with thin margins and high card share, a compliant cash discount program can flip the processing-fee math entirely. See the Florida cash discount compliance guide.
- Tourism-season volume swings change the math. A merchant averaging $20K/mo can spike to $60K/mo for peak season on I-Drive, 192, or Park Avenue. Flat-rate pricing charges the same rate through the spike; interchange-plus reflects the actual premium-card interchange moving with visitor mix.
- The July 2025 Florida service-charge disclosure law added requirements for restaurants on menu and receipt fee disclosures. Any cash-discount line item on a receipt now needs to meet the stricter disclosure standard.
City-specific pages with neighborhood-level pricing patterns: Orlando, Kissimmee, Winter Park, Sanford, and Lake Mary.
Processing-fee content you should not trust
Any page quoting "industry average" effective rates like 2.87%–4.35% without a source is recycling marketing numbers. Any page claiming a specific dollar savings ("save $1,200/year") without asking about your card mix is selling. Any page promising to "eliminate all processing fees" without explaining how cash discount works and what compliance requires is misleading. Your real number comes from your real statement, full stop.
Run your own numbers
Upload your processing statement. We identify every fee, calculate your real effective rate, and flag junk charges. No signup. No sales call triggered.