Automated Clearing House (ACH)

What is the automated clearing house (ACH)?

ACH stands for automated clearing house, the US network that moves money electronically between bank accounts in batches, powering things like payroll, direct deposits, supplier payments and recurring bill collection. Instead of settling each payment one by one, the network gathers transactions together and processes them in scheduled batches, which is what keeps it cheap and reliable. It is run by Nacha and operated through the Federal Reserve and a private operator, and it handles tens of billions of payments a year.

For a business getting paid, ACH is the quiet workhorse behind bank-to-bank payments in the United States. It lets you collect directly from a customer's bank account, with no card and no paper check, at a fraction of the cost of card processing. That makes it a natural fit for accounts receivable, especially for recurring invoices and larger amounts where card fees would sting.

How ACH works

An ACH payment passes through a handful of parties before the money lands, but the flow is straightforward. The network simply batches the request, routes it between the two banks, and settles it on a schedule.

The two directions matter for accounts receivable. An ACH credit is a push, used for things like paying suppliers or running payroll. An ACH debit is a pull, where a business collects money from a customer who has authorized it, which is exactly how recurring invoices and subscriptions get paid. Setting up an ACH debit works much like a direct debit, and providers such as Stripe let you collect them without touching the banking network yourself.

One detail worth knowing is that ACH is not final the instant it posts. Unlike a wire, an ACH entry can be returned, most often because the account had insufficient funds or the details were wrong, and a customer can dispute an unauthorized debit within set time limits. In practice this protection is a feature, not a flaw: it is why customers trust the rail enough to hand over their bank details, and returns on properly authorized business collections are rare. The trade-off for that safety is the short settlement window, which is the price of a payment method this cheap.

ACH vs wire transfer

The core difference is speed versus cost: a wire transfer is fast and settles in near real time but costs a meaningful fee, while ACH is slower, settling in batches over one to three days, but is cheap or free. Wires are processed individually and are effectively irreversible, which makes them right for large, urgent, one-off payments like a property purchase. ACH is batched and far cheaper, which makes it right for routine and recurring payments where a day or two does not matter. For collecting invoices at scale, the economics almost always favor ACH.

How long does an ACH transfer take?

A standard ACH transfer takes one to three business days to clear, while same-day ACH can settle within hours if the payment is submitted before the day's cut-off times. The delay comes from batching: payments are gathered and processed at set windows rather than the instant you send them, and they only move on business days, so weekends and holidays add time. Same-day ACH speeds things up for eligible payments, but it is not instant in the way a card authorization feels. For most invoice collection this lag is a non-issue, because what matters is that the payment is reliable and cheap, not that it arrives in seconds.

How much does ACH cost?

ACH is one of the cheapest ways to move money, typically costing a small flat fee per transaction or under one percent, far below the percentage fees charged on card payments. Because the cost does not scale much with the amount, ACH gets dramatically cheaper than cards as invoice values rise: on a 5,000 invoice, a card fee might run to well over 100, while an ACH debit could cost a dollar or two. That gap is the single biggest reason finance teams steer larger and recurring payments toward bank transfer. Over a year of invoicing, the saved card fees can add up to real money kept rather than handed to a processor. Offering ACH through a customer payment portal lets customers pay straight from their bank account, which protects your margin and still keeps paying easy.

ACH and electronic funds transfer

ACH is one type of electronic funds transfer, the broad umbrella for any movement of money between accounts by computer rather than paper. Wires, card payments and ACH all sit under that umbrella; ACH is the specific US batch network for bank-to-bank transfers. It is also closely related to a payment gateway, which is the layer that captures and authorizes a payment online before it is routed through a network like ACH for settlement. Understanding where ACH fits helps you pick the right rail for each kind of payment, rather than defaulting to whatever is easiest to set up.

ACH is a US-only network, but most countries run their own equivalent that does the same job. If you bill internationally, you will deal with several of these bank-to-bank rails rather than one.

The principle is identical everywhere. Bank-to-bank transfers are cheaper and better suited to recurring billing than cards, which is why finance teams that sell on credit lean on them for the bulk of their collections.