Also called: Automated Clearing House, ACH transfer, ACH transaction, ACH credit, ACH debit, AFT, Automatic funds transfer, Direct debit
What ACH is
ACH stands for Automated Clearing House. It is a US payment network that transfers money electronically between bank accounts, rather than through card networks. Businesses use ACH for payroll, vendor payments, bill collection, and customer invoices.
An ACH credit pushes money into an account, such as a payment you send to a supplier. An ACH debit pulls money from a customer’s account after the customer authorizes the withdrawal. A recurring membership payment and a one-time invoice debit both use ACH, but each debit needs valid authorization.
ACH avoids card interchange, but a returned debit can still disrupt your cash flow and add provider fees.
How an ACH payment moves
Your business, as the originator, submits payment details through its bank, called the originating depository financial institution. The bank groups entries into batches and sends them through an ACH operator, which routes each entry to the receiving bank. That bank posts the debit or credit to the account.
ACH is not instant just because a payment is submitted electronically. Settlement typically takes one to three business days after initiation. Same Day ACH supports payments up to $1 million per payment as of 2026, so larger payments or slower processing can affect when funds reach your account.
What ACH means for your costs
ACH payments do not carry card interchange fees. Your business can still pay transaction-processing, subscription, setup, receiving-bank, or return fees. The provider sets the merchant-facing pricing, so compare the per-payment charge and any fee for a returned debit, not just a headline rate.
For a $2,000 customer invoice, ACH avoids card interchange, but the actual savings depend on your ACH price and the card costs you would otherwise pay. Treat projected savings as a comparison to verify against your own processing fees, not a guaranteed percentage.
Returns and cash flow
An ACH debit can be returned for reasons such as insufficient funds, a closed account, or an unauthorized payment. Most ACH returns must come back within two banking days. A consumer can return an unauthorized debit up to 60 calendar days after settlement, so an early payment confirmation does not erase later return exposure.
As of 2026, Nacha’s return-rate thresholds are 0.5% for unauthorized returns, 3% for administrative returns, and 15% overall. These are network thresholds, not fees. Nacha fraud-monitoring rules took effect in phases on March 20 and June 2026 for originators and banks. Keep authorization records, watch return patterns, and plan cash flow around ACH settlement and possible returns.
What you can actually change
- Compare every fee. Separate ACH transaction charges, monthly fees, setup charges, and return fees. Compare the total with the card-processing cost for the same payment volume.
- Document authorization. Keep a record showing the customer agreed to the debit, its amount or calculation method, and its timing. Match account details to the customer before collecting.
- Track returns promptly. Review return codes and rates each month. Correct account errors, stop repeat attempts when authorization is withdrawn, and maintain cash for returns that arrive after settlement.
Frequently asked questions
How long does an ACH payment take?
ACH settlement typically takes one to three business days after initiation. Same Day ACH supports payments up to $1 million per payment as of 2026, but submission does not mean funds are immediately final or available.
Are ACH payments cheaper than credit cards?
ACH has no card interchange fee, but your business can still pay processing, subscription, setup, receiving-bank, and return fees. Compare the full ACH price with your actual card costs before assuming it will save money.
Can a customer reverse an ACH debit?
Yes. An ACH debit can be returned, including for insufficient funds or an unauthorized payment. Most returns must come back within two banking days, while a consumer unauthorized-debit return can arrive up to 60 calendar days after settlement.