What is ACH?
ACH (Automated Clearing House) is the US network that moves bank transfers in batches, used for payroll, bill payments and most business-to-business payments inside the United States. It is cheaper than a wire and usually settles the next business day, or the same day with Same Day ACH. Example (invented, for illustration only): a Texas distributor pays a $12,400 supplier invoice by ACH credit to the supplier's routing number 095012346 and account number, with the invoice number in the payment reference.
- Nacha reports that the ACH Network carried 35.2 billion payments worth $93 trillion in 2025.
- Business-to-business ACH volume grew almost 10% in 2025, to close to 8.1 billion payments.
- Same Day ACH accepts payments of up to $1 million each, a limit in force since 18 March 2022.
- ACH reaches only accounts in the United States, so a US customer pays a foreign bank account by wire instead.
How ACH works
An ACH payment is an instruction sent by the payer's bank in a file with many others. The files are processed by an ACH operator, such as the Federal Reserve's FedACH service, and settled between banks at set times. Nacha writes the rules that govern the network.
There are two directions. In an ACH credit, the payer pushes money to the payee, as with payroll or a supplier payment. In an ACH debit, the payee pulls money from the payer's account with the payer's authorization, as with a utility bill.
| Measure | 2025 figure |
|---|---|
| ACH payments | 35.2 billion, up nearly 5% |
| Value of ACH payments | $93 trillion, up almost 8% |
| Business-to-business payments | Close to 8.1 billion, up almost 10% |
| Same Day ACH payments | 1.4 billion, worth $3.9 trillion |
| Same Day ACH per-payment limit | $1 million (since 18 March 2022; previously $100,000) |
Sources: Nacha, 2025 ACH Network volume release (29 January 2026); Nacha, Same Day ACH limit; Federal Reserve Financial Services, Same Day ACH Resource Center. As published on 29 October 2026.
Nacha reported in 2023 that about 80% of ACH volume settles in one banking day or less. Same Day ACH, introduced in 2016, settles faster for payments sent before the bank's same day cut-off, and since March 2021 ACH payments settle four times each business day.
Business-to-business payments grew faster than the network as a whole in 2025: almost 10% against nearly 5% for all ACH payments.
Where a business meets ACH
Most US companies pay vendors by ACH because it is low cost and handles invoice references well. A business outside the US meets ACH when a US customer says it can only pay by ACH, or asks for routing and account details instead of a SWIFT code.
ACH needs a routing number and account number in the United States. Because an ACH payment stays inside one country, no correspondent bank sits in the chain to deduct a fee, so the amount sent is the amount that arrives. A Mexican or Hong Kong bank account cannot receive ACH; the US customer must send an international wire, which costs more and passes through correspondent banks. US account details in the company's own name let that customer pay a domestic ACH instead.
Common mistakes with ACH
- Expecting same day arrival by default. Standard ACH settles on a later settlement window. Ask the payer whether it uses Same Day ACH.
- Sending more than the Same Day limit. Payments above $1 million go by standard ACH or by wire.
- Using ACH for urgent payments. For a time-critical payment, Fedwire settles each transfer individually and immediately.
- Changing vendor bank details without a call-back. Payment fraud often starts with an email asking to update ACH details.
- Giving a US payer a foreign account when it only pays by ACH. The payment cannot be sent, or is switched to a wire that costs both sides more. Offer US account details instead.
Related terms and how Helm handles it
ACH is one of three ways a US dollar payment moves, alongside Fedwire and SWIFT. Its European counterpart is SEPA and its UK counterpart is Faster Payments.
Helm's USD account details in your company's own name receive ACH. Helm agrees pricing with each business in writing before the account opens, and shows the rate, the fee and the expected arrival before you confirm each payment.
Open a Helm account
USD, EUR and GBP accounts in your company's name, with a named account manager.
Open accountQuestions
How long does an ACH transfer take?
Nacha reported that about 80% of ACH volume settles in one banking day or less. Same Day ACH payments settle on the same business day when the bank submits them before its same day cut-off.
What is the Same Day ACH limit?
$1 million per payment, in force since 18 March 2022. The limit applies to all eligible Same Day ACH credits and debits, for businesses and consumers.
Can I send ACH to another country?
Not from an ordinary US account to a foreign bank account. ACH reaches accounts in the United States; payments abroad go by international wire or through a provider that pays out on local rails.
What is the difference between ACH and a wire?
ACH processes payments in batches at set times and is low cost. A Fedwire transfer settles individually in real time and is final once processed, which suits urgent or large payments.
Who runs the ACH network?
Nacha writes the rules, and ACH operators such as the Federal Reserve's FedACH service process and settle the payments between banks.
References
- Nacha: Same Day ACH and business-to-business payments propel ACH Network volume growth in 2025 (29 January 2026)
- Nacha: Same Day ACH payment limit to increase to $1 million
- Federal Reserve Financial Services: Same Day ACH Resource Center
- Nacha: Significant majority of ACH payments settle in one business day or less (28 August 2023)
- Nacha: FBI's IC3 finds almost $8.5 billion lost to business email compromise in last three years
This guide is general information for businesses, not financial, legal or tax advice. Rules, fees and timings were checked against the sources listed on the review date and may change.