Best B2B Invoice Payment Processors
B2B invoice payments are the highest-margin segment of US merchant processing — large tickets, high volume of corporate cards, and the ability to qualify for Level 2/3 interchange that cuts 50–100 basis points off rewards/corporate card costs. The right stack depends on how you invoice today: QuickBooks-native shops should evaluate Intuit Payments vs Helcim with the QuickBooks sync. AP-heavy operations should look at Bill.com or Melio. Anyone invoicing with corporate-card payers needs Level 2/3 and surcharging support.
- 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 - 3
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 - 4BILL (Bill.com)6.8/10
Mid-market AP/AR automation platform with built-in payment acceptance.
Pricing: ACH free / Card 2.9% + AP plan from $45/user/moContract: 1-year✓ Mature AP/AR automation with approval workflows✗ $45+/user/mo is expensive for sub-10-person teams - 5Melio Payments7/10
B2B accounts-payable platform — pay vendors by card, vendor receives ACH.
Pricing: 2.9% (card payments) / Free (ACH)Contract: month-to-month✓ Solves a real cash-flow / rewards-card problem for B2B✗ Card fee (2.9%) only makes sense if the cash-back / float math wins - 6Plastiq6.8/10
Pay-anything-by-card platform for rent, taxes, and large vendor payments.
Pricing: 2.9% per transactionContract: month-to-month✓ Pay anything by card (rent, taxes, payroll, vendor invoices)✗ 2.9% fee only makes sense when rewards/float math wins - 7Authorize.net7.7/10
Veteran payment gateway — almost always paired with another processor.
Pricing: $25/mo + 10¢ per transaction (gateway only)Contract: month-to-month✓ Massive integration library — works with virtually everything✗ Adds $25/mo + 10¢/txn ON TOP of your processor's fees - 8Dharma 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
Bottom line
For most B2B operators sending invoices in QuickBooks or NetSuite, Helcim with Level 2/3 enabled and surcharging on credit cards is the cleanest setup — interchange-plus, no contract, fair markup. For AP automation where you're paying suppliers more than receiving payments, Bill.com or Melio plus an ACH-first flow saves more than card processing optimization can. Plastiq is the niche pick for paying invoices that don't accept cards — it bridges with a 2.9% fee, which is occasionally worth it for the float.
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.
- AP / Corporate Card Markup+30 to +80 basis points vs consumer card interchange
- Level 2 / Level 3 ProcessingSaves 50–100 basis points on commercial cards
- MOTO / Keyed-Entry Surcharge+30 to +80 basis points over card-present interchange
- SurchargingUp to 3% on credit cards (network rule)
- Interchange Downgrades0.20%–0.80% extra cost per downgraded transaction