Best Credit Card Processors for Contractors
Contractors face two specific challenges most other industries don't: very large tickets where every basis point matters, and a high percentage of B2B card payments that qualify for cheaper Level 2/3 interchange. The right processor cuts your effective rate by 50–80 basis points compared to a generic flat-rate setup. Surcharging is also widely accepted in this category — passing the fee to the customer can eliminate processing costs entirely on credit card transactions.
- 1Helcim8.7/10
Interchange-plus pricing with no monthly fee — best-kept secret in SMB processing.
Pricing: Interchange + 0.4% + 8¢ (in-person)Contract: month-to-month✓ Interchange-plus pricing with PUBLIC rates — extremely rare✗ Smaller hardware lineup than Square or Clover - 2
Subscription processing — pay a flat monthly fee, then pure interchange + per-transaction.
Pricing: Interchange + 8¢ per transaction (subscription)Contract: month-to-month✓ Subscription model removes percentage markup entirely✗ Monthly fee makes it expensive below ~$25K/mo volume - 3Dharma Merchant Services8.7/10
Ethical, interchange-plus processing with strong nonprofit pricing.
Pricing: Interchange + 0.15% + 8¢ (retail)Contract: month-to-month✓ B-Corp certified — strong ethics positioning✗ $20/mo fee makes it pricier than Helcim at low volume - 4National Processing8.2/10
Interchange-plus ISO with low monthly fee and strong restaurant pricing.
Pricing: Interchange + 0.14% + 7¢ (restaurants)Contract: month-to-month✓ Industry-specific public pricing — rare for an ISO✗ Smaller brand vs. Stripe/Square - 5
Bundled with QuickBooks — convenient but seldom the cheapest.
Pricing: 2.5% + 25¢ (in-person), 2.99% + 25¢ (invoice)Contract: month-to-month✓ Auto-reconciliation in QuickBooks — biggest time-saver✗ 2.99% invoice rate is among the highest published rates - 6Payment Depot8/10
Membership-based wholesale processing — interchange + cents per transaction.
Pricing: Interchange + 5¢–25¢ per transaction (membership)Contract: month-to-month✓ True interchange + cents pricing (no percentage markup)✗ Monthly fee makes it expensive below ~$15K/mo
Bottom line
For most contractors, Helcim is the default choice: interchange-plus pricing with public rates, no monthly fee at low volume, and full Level 2/3 support. Above $30,000/month in card volume, Stax's subscription model becomes mathematically cheaper. For QuickBooks-native contractors who value reconciliation over the lowest rate, Intuit Payments is convenient but expensive — switch to Helcim with the QuickBooks sync app and save real money.
Head-to-head comparisons
Direct comparisons between the top-ranked processors on this list.
Fees that affect this category
Definitions, typical ranges, and how to negotiate them.
- Processor Markup0.15% + 5¢ (best-in-class) to 1.50% + 25¢ (poorly-negotiated tiered)
- Interchange Fees0.05% + 22¢ (regulated debit) to 3.50% + 10¢ (corporate cards)
- SurchargingUp to 3% on credit cards (network rule)
- Cash Discount ProgramEquivalent to 3%–4% of card volume
- Effective Rate1.80% (best-case low-risk) to 4.00%+ (poorly-priced tiered)