ACH Transfer
An ACH transfer is an electronic payment processed through the Automated Clearing House network — the batch-processing system overseen by Nacha that handles the vast majority of U.S. direct deposits, bill payments, and business-to-business transactions.
The Automated Clearing House (ACH) network is operated under the governance of Nacha (formerly the National Automated Clearing House Association), a self-regulatory organization that sets the rules, standards, and procedures for ACH transactions. The Federal Reserve and The Clearing House serve as the two ACH operators, processing the transactions and managing interbank settlement. The ACH network processes over 30 billion transactions totaling more than $75 trillion annually, making it the backbone of everyday U.S. electronic payments.
ACH transactions fall into two categories: ACH credits, where the originator pushes funds to a recipient (as in payroll direct deposit or bill payment with account authorization), and ACH debits, where the originator pulls funds from a receiver's account (as in auto-pay mortgage or utility payments). Unlike wire transfers, ACH payments are processed in batches rather than individually, and they historically settled on a one- to two-business-day timeline. However, the introduction of Same Day ACH capability — phased in from 2016 onward — now allows same-day settlement for most ACH transactions submitted by defined cutoff times.
From a cost standpoint, ACH is dramatically cheaper than wire transfers for routine payments. Per-transaction costs typically range from a few cents to a fraction of a percent, versus wire fees of $25 to $50 or more per transaction. This cost differential drives the widespread use of ACH for recurring payments — payroll, Social Security benefits, tax refunds, mortgage payments, and vendor disbursements.
ACH transactions are governed by Nacha's Operating Rules, which include provisions for error resolution, return codes, and liability allocation. Unauthorized ACH debits must be returned within 60 days under consumer protection provisions of Regulation E, enforced by the Consumer Financial Protection Bureau (CFPB). For businesses, the return window and liability rules differ from consumer protections.
Financial institutions have AML obligations for ACH transactions under the Bank Secrecy Act, though the batch nature of ACH processing makes transaction monitoring more technically challenging than for individual wire transfers.