Compare Pricing Models — Merchant Services
Compare pricing models for merchant services — interchange-plus, flat-rate, surcharge, cash discount, and dual pricing side by side. This payment processing pricing comparison covers every major model so you can see exactly how costs, transparency, and fit differ across business types. Every model has a different cost structure, transparency level, and fit for different business types. The wrong model costs you thousands per year in avoidable fees. For a full narrative explanation of each model, see the payment processing pricing guide. According to Federal Reserve interchange fee data, average debit interchange is significantly below what flat-rate processors charge — meaning most businesses overpay by default.
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Payment Processing Cost Comparison at $20,000/Month
The table below lets you compare pricing models at identical volume so the cost difference is clear. Assuming $20,000/month card volume, 400 transactions, $50 average ticket, standard consumer credit card mix. For businesses processing large B2B invoices or recurring payments, ACH payment processing can reduce costs even further — flat fees of $0.20–$1.50 per transaction regardless of dollar amount.
| Pricing Model | Rate Structure | Est. Monthly Cost | Est. Annual Cost | Net to Merchant |
|---|---|---|---|---|
| Interchange-Plus Recommended | Interchange + 0.25% + $0.10 | ~$380 | ~$4,560 | $19,620 |
| Flat-Rate (Square) | 2.6% + $0.10/txn | ~$560 | ~$6,720 | $19,440 |
| Flat-Rate (Stripe) | 2.9% + $0.30/txn | ~$700 | ~$8,400 | $19,300 |
| Surcharge Program | 3% added to card transactions | ~$0 | ~$0 | $20,000 |
| Cash Discount | Posted price includes fee; cash gets discount | ~$0 | ~$0 | $20,000 |
| Dual Pricing | Two prices displayed: cash and card | ~$0 | ~$0 | $20,000 |
* Interchange-plus estimate based on ~2.0%+ average effective rate (interchange + 0.25% markup + $0.10/txn). Surcharge, cash discount, and dual pricing show $0 net cost to merchant — the processing fee is recovered from or built into customer pricing. Actual costs vary by card mix.
Pricing Model Calculator — Compare Any Two Models
Use this calculator to compare pricing models at your actual volume. Enter your monthly card volume and average ticket to compare any two pricing models side by side.
Compare Pricing Models — Criteria Grid
One model not shown here: tiered pricing — the bundling model used by many traditional processors that sorts cards into opaque qualified, mid-qualified, and non-qualified buckets. It is the least transparent model available and almost always more expensive than interchange-plus. The interchange-plus vs flat-rate comparison is the most common decision point for merchants moving off Square or Stripe. See how tiered pricing works and why most merchants should avoid it.
| Criteria | Interchange-Plus | Flat-Rate | Surcharge | Cash Discount | Dual Pricing |
|---|---|---|---|---|---|
| Net Cost to Merchant | Low | Moderate–High | Near Zero | Near Zero | Near Zero |
| Transparency | Highest | Moderate | Moderate | Moderate | High |
| Setup Complexity | Low | Lowest | Moderate | Moderate | Moderate |
| Customer Impact | None | None | Sees fee at checkout | Incentivized to pay cash | Sees two prices |
| State Restrictions | None | None | Some states restrict | Permitted everywhere | Permitted everywhere |
| Best For | Most businesses $10k+/mo | Very low volume | High card volume, permitted states | Cash-friendly businesses | Retail, food service |
| Works Online? | Yes | Yes | Credit cards only | Complex online | Yes |
| Debit Card Eligible? | Yes | Yes | No (credit only) | Yes | Yes |
Adoption has accelerated sharply: 34% of US small businesses added a credit card surcharge in 2025, up from 1–2% in 2019, according to the J.D. Power 2025 U.S. Merchant Services Satisfaction Study. The 2026 study put the figure at 35%, with 32% of surcharging merchants reporting that customers cancel purchases at least some of the time when a surcharge appears at checkout. Brookside's surcharge decision framework walks through which verticals tipped first and where the customer walk-away rate actually sits.
Pricing Model Case Studies
A retail boutique processing $45,000/month on Square at 2.6% + $0.10 was paying ~$1,210/month. After switching to interchange-plus at a 2.1% effective rate, monthly fees dropped to ~$882 — saving $378/month or $4,536/year with no change to customer experience. Beyond cost, the switch eliminated the account freeze risk that comes with Square's payment facilitator model — read about what happens when Square freezes your account and why dedicated merchant accounts are structurally different. See also the full Square payment processing problems breakdown.
A quick-service restaurant processing $30,000/month was paying ~$810/month in flat-rate fees. After implementing dual pricing — displaying a cash price and a card price — card processing costs dropped to near zero. Net monthly savings: $810/month.
A law firm in a surcharge-permitted state processing $80,000/month in credit card payments was absorbing ~$2,000/month in fees. After implementing a disclosed 3% credit card surcharge, net processing cost dropped to near zero. Chargebacks remained a consideration — a chargeback on a surcharged transaction means absorbing both the reversed amount and the surcharge. The firm implemented clear client agreements to minimize dispute risk. For a deeper look at how processors handle disputes differently, see how PayPal handles chargeback disputes compared to traditional processors.
An online retailer processing $60,000/month on Stripe at 2.9% + $0.30 per transaction was paying ~$1,860/month. After migrating to interchange-plus pricing, effective rate dropped to ~2.1% — saving ~$480/month or $5,760/year. The migration also included switching to a direct payment gateway — eliminating Stripe's gateway markup entirely. For a detailed breakdown of this comparison, see Stripe payment processing problems. For similar issues with PayPal, see PayPal payment processing problems.
Which Model Wins When You Compare Pricing Models?
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Frequently Asked Questions
Interchange-plus is almost always cheapest for businesses processing more than $10,000 per month. It passes the actual card cost directly to you plus a fixed markup, rather than bundling everything into a blended rate that hides the processor's margin. Flat-rate is simpler at low volume but becomes expensive as volume grows.
Flat-rate charges the same percentage on every transaction regardless of card type — typically 2.6–2.9%. Interchange-plus charges the actual card network cost plus a fixed processor markup. On debit cards and standard credit cards, interchange is often well below the flat rate, so interchange-plus produces meaningful savings at higher volumes.
For businesses with consistent in-person card volume, cash discount and dual pricing programs can eliminate processing fees entirely by building the card cost into the posted price and offering a discount for cash. They are legal in all 50 states and require no card brand registration. The tradeoff is customer-facing pricing complexity, which fits some businesses better than others.
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