ACH (Automated Clearing House)

ACH is the electronic network used across the United States to batch and clear bank-to-bank payments, from payroll and bill payments to direct debits and vendor disbursements, without relying on card networks.

What Is ACH?

Rather than moving money in real time, ACH transactions are collected into batches and processed at scheduled intervals throughout the day by the ACH network, which is governed by NACHA rules. This batch model makes ACH a low-cost way to move funds domestically within the US, though it is typically slower than card payments or real-time transfer rails.

How ACH Payments Work

An originating bank collects payment instructions from a business or individual and submits them to an ACH operator, which sorts and batches transactions before routing them to the receiving bank. Funds are typically available within 1 to 3 business days, and either party can initiate a transaction: a "debit" pulls funds from an account, as with bill payments, while a "credit" pushes funds out, as with payroll or payouts.

ACH Benefits for Recurring and B2B Payments

For US-facing merchants, ACH offers a lower-cost alternative to card processing, particularly for high-value or recurring payments where card fees add up quickly. It is widely used for subscription billing, B2B invoicing and payroll-style disbursements, and pairs well with open banking payments for merchants looking to reduce their dependency on card rails.

ACH and the Modern Payment Stack

As real-time and open banking rails expand, ACH remains a core part of the US payment mix rather than a replacement for newer methods. Understanding where it fits is part of building a resilient stack: see open banking and its role in modern payment infrastructure and instant bank payments: a strategic opportunity for merchants for how these rails compare.

ACH vs Wire Transfer

ACH and wire transfers both move money electronically between US bank accounts, but they differ significantly in speed, cost and use case. Wire transfers settle same-day and are typically irrevocable once sent, making them the preferred choice for large, time-sensitive payments such as real estate transactions. ACH, by contrast, is processed in batches, generally costs far less per transaction, and is better suited to high-volume, lower-value use cases like payroll, subscriptions and recurring B2B payments. Because ACH transactions can still be reversed within a defined window, they carry a different risk profile to a wire, which is one reason many banks charge noticeably more for wires despite the faster settlement.