The Automated Clearing House, or ACH, is a U.S. electronic network that moves money between bank accounts in scheduled batches rather than one payment at a time.1Board of Governors of the Federal Reserve System. Automated Clearinghouse Services It’s the plumbing behind direct-deposit paychecks, tax refunds, Social Security payments, online bill pay, and the automatic withdrawals your utility or gym takes each month. In 2025, the network processed over 35.2 billion payments worth roughly $93 trillion. Federal law and a set of private operating rules govern how it works, who is responsible when something goes wrong, and how quickly your money arrives.
Who Runs the ACH Network
Two parts of the system do different jobs. Nacha, a nonprofit organization, writes and enforces the operating rules every bank and credit union in the network must follow.2Nacha. About Us Those rules cover how payment data is formatted, when it settles, and what each institution owes the others. Nacha does not actually process payments.
The processing itself runs through two operators: the Federal Reserve, through its FedACH service, and The Clearing House, through its EPN system.1Board of Governors of the Federal Reserve System. Automated Clearinghouse Services When a bank submits a batch of payment instructions, one of these operators sorts the entries, figures out which bank each payment belongs to, and routes the data to the right destination.
The Four Parties in Every ACH Payment
Every ACH transaction has the same cast:
- The Originator starts the transaction. If your employer pays you by direct deposit, your employer is the Originator.
- The Originating Depository Financial Institution (ODFI) is the Originator’s bank. It validates the request and sends it into the network.3Nacha. How ACH Payments Work
- The Receiving Depository Financial Institution (RDFI) holds the account where the money is headed. It receives the entry and applies it to the correct account.
- The Receiver is the person or business whose account is credited or debited. That’s you, when you get a paycheck or when a company pulls a bill from your checking account.
In a payroll run, your employer tells its bank to send wages, an ACH operator routes the instructions to your bank, and the deposit shows up in your account.
Credits and Debits: The Two Directions Money Moves
ACH payments run one of two ways. A credit is a “push”: the Originator sends money to the Receiver’s account. Payroll deposits, tax refunds, and Social Security payments are common credits.4Nacha. How ACH Works A debit is a “pull”: the Originator takes money out of the Receiver’s account. When your utility company collects a monthly bill from your checking account, that’s an ACH debit.
How Long an ACH Transfer Takes
ACH is a batch system, not a real-time one. Banks collect payment instructions during the day, bundle them, and transmit the batch to an ACH operator at set times.4Nacha. How ACH Works The operator sorts the batch by destination bank and delivers it, and the receiving bank posts the credit or debit to the customer’s account.
Settlement, when money officially moves between the two banks, follows a predictable schedule. All ACH debits settle in one business day. Credits can settle the same day, the next business day, or in two business days at the sender’s option, but no more than two business days out. Roughly 80 percent of all ACH payments settle within one business day or less.5Nacha. The Significant Majority of ACH Payments Settle in One Business Day or Less
Same-Day ACH
When a payment needs to arrive faster, Same-Day ACH settles by the end of the current business day. FedACH offers three same-day windows, with submission deadlines at 10:30 a.m., 2:45 p.m., and 4:45 p.m. Eastern Time and settlement at 1:00 p.m., 5:00 p.m., and 6:00 p.m. that same day.6Federal Reserve Financial Services. FedACH Processing Schedule A single Same-Day ACH payment can be up to $1,000,000.7Federal Reserve Financial Services. Same Day ACH Frequently Asked Questions
Authorization and Your Rights on a Consumer Account
Before a business can pull money from your account by ACH debit, it needs your permission. Nacha rules require consumer debits to be authorized in writing or through a similarly authenticated method, such as clicking “I agree” on a payment page.8Nacha. Meaningful Modernization Becomes Effective Sept. 17, 2021 Without valid authorization, the debit is unauthorized and you can dispute it. Nacha rules also require that ACH data sent over unsecured networks, including the internet, be encrypted with commercially reasonable technology.9Nacha. Understanding the Value of Encryption in the ACH Network
On top of the Nacha rules, the Electronic Fund Transfer Act and its implementing rule, Regulation E (12 CFR Part 1005), give personal accounts a set of federal protections.
Liability for Unauthorized Transfers
How much you can lose on an unauthorized ACH withdrawal depends on how fast you tell your bank:
- Report it within 2 business days, and your liability is capped at $50 or the amount taken before you notified the bank, whichever is less.10eCFR. 12 CFR 1005.6 Liability of Consumer for Unauthorized Transfers
- Report it after 2 business days but within 60 days of the statement showing the problem, and your liability rises to a maximum of $500.10eCFR. 12 CFR 1005.6 Liability of Consumer for Unauthorized Transfers
- Wait longer than 60 days, and you can be responsible for the full amount of any unauthorized transfers that happen after the 60-day window closes.10eCFR. 12 CFR 1005.6 Liability of Consumer for Unauthorized Transfers
Check your statements. Report anything unfamiliar right away.
Error Resolution
Once you report an error or an unauthorized transfer, your bank has to investigate within 10 business days and tell you what it found within three business days after that. If it needs more time, it can take up to 45 days, but only if it provisionally credits your account for the disputed amount within the first 10 business days, and you get full access to that money while the investigation continues.11Consumer Financial Protection Bureau. 12 CFR 1005.11 Procedures for Resolving Errors If the bank decides there was no error, it can reverse the provisional credit, but it has to notify you first and explain why.
Stopping a Recurring Payment
If you have a recurring ACH debit on your account, whether it’s a gym membership, a streaming subscription, or an insurance premium, you can stop it by notifying your bank at least three business days before the next scheduled withdrawal.12Consumer Financial Protection Bureau. 12 CFR 1005.10 Preauthorized Transfers The request can be oral or in writing. Once the bank honors it, the block stays in place for future payments from that company until you tell the bank to resume them.
Business Accounts Are a Different Story
Regulation E’s protections apply to consumer accounts only. If your business account gets hit with an unauthorized ACH debit, the $50 and $500 liability caps and the 10-day investigation timeline don’t automatically apply. Business-to-business ACH credits fall under Article 4A of the Uniform Commercial Code, and debits are governed mostly by the Nacha Operating Rules and whatever your bank’s account agreement says. The dispute window for improper reversals on a non-consumer account is just two banking days, compared with up to 60 calendar days for a consumer account.13Nacha. ACH Network Rules – Reversals and Enforcement If you run a business, read your account agreement closely. The rights vary.