Early-pay discount
Offer a discount for ACH that is smaller than the interchange you would otherwise pay. You keep the difference and the customer gets a real benefit.
Bank rails
ACH Payment Processing for B2B Invoices
On a large invoice, ACH is usually the cheapest way to get paid by a wide margin. The obstacles are habit and authorization, not technology.
The short answer
ACH payment processing moves funds directly between bank accounts through the Automated Clearing House network. For B2B sellers it is priced as a flat fee per transaction rather than a percentage of the invoice, which makes it dramatically cheaper than any card on large invoices - the fee on a $50,000 ACH payment is the same as on a $500 one.
The trade-offs are timing and returns. Standard ACH settles in one to two business days and same-day ACH is available at a higher fee, both slower than a card authorization. Payments can also be returned after the fact for insufficient funds, closed accounts or unauthorized debits, so ACH carries a collection risk a card authorization does not.
When ACH beats a card, and when it does not
| Invoice size | Card cost shape | ACH cost shape | Usually cheaper |
|---|---|---|---|
| $500 | Percentage of a small base | Flat fee | Depends on your pricing - run the numbers |
| $5,000 | Percentage, meaningful | Same flat fee | ACH, usually by a wide margin |
| $50,000 | Percentage, very large | Same flat fee | ACH, decisively |
The flat fee does not scale with the invoice. That single fact is the whole argument, and it gets stronger the larger your invoices are.
Returns, and how to manage the risk
An ACH debit can be returned after you have treated it as paid. The common reasons are insufficient funds, a closed account, or the customer claiming the debit was unauthorized.
This is manageable but it is real, and it is the main reason ACH suits established trade accounts better than first-time buyers.
- R01 insufficient funds and R02 account closed are the most frequent, and both are usually recoverable by contacting the customer.
- R10 and R11 unauthorized returns have a much longer window and are what proper authorization records protect you from.
- Verification at setup - confirming the account exists and belongs to the customer - removes most of the avoidable failures.
- For new accounts, consider a card or a prepayment on the first order and ACH once a relationship exists.
Moving customers off cheques and cards
Persuasion rarely works. Terms do.
Make it the default
On new trade accounts, set ACH as the default payment method on the credit application rather than an option to opt into.
Autopay on standing orders
For predictable repeat volume, autopay removes the collection step entirely.
Keep the card available
Some AP departments genuinely cannot pay by ACH. Fighting that costs more in relationship than it saves in fees.
Where you are today
Four ways operators start with us on Most B2B sellers are paying card interchange on invoices that should have been ACH.
New or pre-revenue business
Not processing yet. We map which payment methods your card mix and products can realistically support, what each costs, and what your application file needs before you open.
Plan your payment setupOperating and looking to switch
Already processing but paying too much, funding too slowly, or working around a system that does not fit. Send statements and we return a line-by-line read plus alternatives.
Review my current setupRecently shut down or restricted
Account terminated, frozen, capped or moved to reserve. We help you interpret the notice, pursue held funds, and rebuild with fewer single points of failure.
Get help with a complex accountDeclined during underwriting
Turned down on application. We read the decline reason, identify what was missing or mismatched in the file — licence, ownership, product mix, banking — and rebuild the submission before it goes back out.
Review a declined applicationFrequently asked questions
How long does ACH take to settle?+
Standard ACH is typically one to two business days. Same-day ACH is available at a higher per-transaction fee and settles the same business day if submitted before the cut-off.
What is the difference between ACH and a wire?+
A wire is real-time, irreversible and costs substantially more per transaction. ACH is slower, reversible within a returns window, and much cheaper. For scheduled invoice payments ACH is almost always the better fit.
Can an ACH payment be reversed?+
Yes, within the return window, which is why authorization records matter. Unauthorized-return codes carry a longer window than insufficient-funds returns.
Do we need the customer's bank details?+
Yes - routing and account number, plus an authorization. Account verification at setup is strongly worth doing and removes most avoidable returns.
Related pages and resources
Comparison tableCommercial card vs ACH decision guideWhich rail is cheaper at which invoice size, and where the answer flips.Read more CalculatorInterchange savings calculatorEnter your monthly card volume, average ticket and current effective rate to see the annual gap.Read more ChecklistMerchant statement audit checklistRun the analysis yourself before you ask anyone for a quote.Read more
More on ach for b2b
Bank-to-bank settlement for invoices: pricing, timing, returns and authorization requirements. These pages sit under this guide and link back to it.
Comparisonour comparison criteriaYou are evaluating ACH or pay-by-bank acceptance for a B2B or distribution business.Open ComparisonCard versus ACH: the rails comparedYou want alternatives to debit acceptance, or a replacement for a debit method that has stopped working.Open QuestionIs ACH cheaper than a credit card for B2B invoicesOn large invoices, almost always. ACH is priced as a flat fee per transaction and a card as a percentage of the invoice, so the gap widens with every dollar. The fee on a $50,000 ACH payment is identical to the fee on a $500 one, while the card cost scales throughout. On small invoices the two can be comparable, and the crossover point depends on your specific pricing.Open Resourcewhich rail is cheaper at which invoice sizeWhich rail is cheaper at which invoice size, what each one costs in practice, and where the answer flips. Percentage pricing and flat fees cross over at a point specific to your business.Open Case studyPackaging Distributor ACH Migration: A Sample ScenarioA packaging distributor used an early-pay discount to move standing accounts onto autopay, then optimized what was left.Open GlossaryACHThe Automated Clearing House network, used in the US for bank-to-bank debits and credits. Common for B2B wholesale, vendor and subscription payments.Open GlossaryAuthorization (glossary)The issuer's approval of a card transaction amount before it is captured and settled.Open GlossaryReturn (ACH) (glossary)An ACH entry sent back unpaid, for example for insufficient funds or an unauthorized debit. High return rates threaten ACH access.Open ServiceACH PaymentsBank-to-bank payments that lower cost and unlock recurring revenue.Open
Read next
- 1ACH vs credit card costOn large invoices, almost always. ACH is priced as a flat fee per transaction and a card as a percentage of the invoice, so the gap widens with every dollar. The fee on a $50,000 ACH payment is identical to the fee on a $500 one, while the card cost scales throughout. On small invoices the two can be comparable, and the crossover point depends on your specific pricing.
- 2Commercial Card vs ACH Decision GuideWhich rail is cheaper at which invoice size, what each one costs in practice, and where the answer flips. Percentage pricing and flat fees cross over at a point specific to your business.
- 3You are evaluating ACH or pay-by-bank acceptance for a B2B or distribution business.You are evaluating ACH or pay-by-bank acceptance for a B2B or distribution business.
Find out what your statements actually say
Send three months of merchant statements and one representative invoice. You get back a line-item breakdown of what is downgrading, what it costs annually, and what could realistically be recovered. No obligation, and the analysis is yours either way.
Interchange qualification depends on your card mix, the data your systems can transmit, your settlement timing, and card-brand rules that change twice a year. Nothing on this page is a quoted rate, a guarantee of savings, or a promise of approval. Figures shown are illustrative ranges drawn from published card-network and industry sources, not an offer. What you would actually save is whatever a review of your own statements shows, which is why we start there.