Best Payment Processors for Small Businesses
Quick answer: For businesses under $5K/month, Square is hard to beat (free hardware, simple setup). For $5K-$50K/month, a dedicated merchant account with interchange-plus pricing saves 15-30%. For high-risk businesses, you need a specialist processor like Unison regardless of volume. The best processor depends on your business type, volume, and product category. For more head-to-head reviews, see PayAnywhere vs Square and QuickBooks credit card processing (fees vs alternatives).
Choosing a payment processor is one of the most impactful decisions for a small business. The wrong choice costs thousands in excessive fees, and the wrong type of processor can result in frozen funds and account termination.
Quick Recommendation by Business Type
| Business Type | Best Processor | Why |
|---|---|---|
| New retail (< $5K/mo) | Square | Free hardware, zero monthly fees |
| Growing retail ($5K+/mo) | Unison + Clover | Interchange-plus saves 15-30% |
| Online store (low-risk) | Stripe or Shopify Payments | Easy integration, managed checkout |
| Online store (high-risk) | Unison + PayTrace/NMI | Dedicated underwriting, stable account |
| Restaurant | Unison + Clover Dining | Table management, tip adjustment |
| Service business | Unison + Clover Go | Mobile processing, invoicing |
| High-risk industry | Unison | Only option for prohibited categories |
Pricing Models Explained
Flat rate (Square, Stripe, PayPal)
You pay the same percentage on every transaction regardless of card type. Simple but expensive — debit cards cost the processor 0.5-1.5% at interchange but you still pay 2.6-2.9%.
Interchange-plus (Unison, most dedicated processors)
You pay the actual wholesale interchange rate set by Visa/Mastercard plus a small processor markup. This is the most cost-effective model for businesses processing $5K+/month. See our interchange-plus pricing guide.
Tiered (avoid these)
Processors categorize transactions into "qualified," "mid-qualified," and "non-qualified" tiers with different rates. This model is designed to be confusing and expensive. Avoid any processor using tiered pricing.
Cost Comparison at $20,000/Month
| Processor | Pricing Model | Monthly Cost | Annual Cost |
|---|---|---|---|
| Square | Flat 2.6%+$0.10 | $530 | $6,360 |
| Stripe | Flat 2.9%+$0.30 | $640 | $7,680 |
| [PayPal](/blog/paypal-alternative-businesses) | Flat 2.99%+$0.49 | $698 | $8,376 |
| Unison (interchange-plus) | IC + markup | $380-450 | $4,560-5,400 |
| **Savings vs PayPal** | **$2,976-3,816** |
What to Avoid
1. Long-term contracts — legitimate processors offer month-to-month agreements 2. Early termination fees — a sign of a predatory contract 3. Tiered pricing — designed to be confusing and expensive 4. Equipment leasing — always buy or rent, never lease (leases cost 5-10x the equipment value) 5. Hidden fees — PCI non-compliance fees, statement fees, batch fees add up
High-Risk Businesses: Different Rules
If you sell vape, firearms, adult content, CBD, peptides, supplements, gambling, or travel — your options are limited to processors that specialize in high-risk. Square, Stripe, and PayPal all prohibit these categories.
Unison Payment Solutions provides dedicated merchant accounts for 50+ high-risk industries with interchange-plus pricing, chargeback prevention, and no contracts.
Contact Unison for a free consultation, or see our pricing.