What Is an ACH Reversal? Rules, Deadlines, and Filing Steps

An ACH reversal is a corrective entry the original sender transmits to undo an electronic payment made through the Automated Clearing House network. It’s how a payer claws back funds after sending the wrong amount, paying the wrong account, or duplicating a transaction. The rules are narrow: Nacha, which governs the ACH network, only permits reversals for a short list of errors, and the reversing entry has to reach the receiving bank within five banking days of the original settlement date.

A reversal is not a refund, a chargeback, or a way out of a payment you now regret. If you used the wrong process for the wrong reason, the receiving bank can reject the entry and Nacha can fine your bank.

When You Can Reverse an ACH Payment

Nacha’s Operating Rules allow a reversal only when the original transaction falls into one of these error categories:

Duplicate payment. The same entry was processed more than once, usually because of a file transmission glitch or administrative slip.
Wrong dollar amount. The payment went out for a different amount than intended — say, $10,000 instead of $1,000.
Wrong receiver. The money went to the wrong account, typically from a transposed routing or account number.
Wrong timing. A debit posted earlier than intended, or a credit posted later than intended.

There is one additional carve-out: an originator may reverse certain payroll credits tied to an employee’s termination or separation from employment.

Anything else is off-limits. A billing dispute, a change of mind, unhappiness with what you received — none of these justify a reversal. Using the process outside the permitted reasons can trigger Nacha enforcement against the originating bank, and in serious cases the originator can be suspended from the ACH network entirely.¹

The Five-Day Deadline

The reversing entry must reach the receiving bank within five banking days after the settlement date of the original transaction. Banking days are weekdays the Federal Reserve is open; Saturdays, Sundays, and federal holidays do not count. If the original transaction settles on a Monday, the window runs through the following Monday, assuming no holidays fall in between.

Miss the window and the reversal option is gone. From that point, the sender has to ask the receiver for a voluntary refund or pursue the money through the civil courts.

The originator also has to notify the receiver about the reversal, no later than when the reversing file is transmitted. The method of notice can vary; the timing is firm under Nacha’s rules.

What You Need to File a Reversal

Before contacting your bank, pull the following from the original transaction:

The trace number, a fifteen-digit identifier assigned by the originating bank. The first eight digits are the bank’s routing number and the last seven identify the item. It usually appears on the transaction receipt or in your accounting software.²
The exact dollar amount. The reversing entry must match precisely.
Both the originator’s and receiver’s account numbers, exactly as they appeared on the original entry.
The Company ID and Standard Entry Class (SEC) code from the original batch header. Both must be identical in the reversal file.

You also assign the correct reason code so the receiving bank knows what happened. And the reversal file itself must carry the word “REVERSAL” in all capital letters in the Company Entry Description field, which flags the entry as corrective at every stop along the network.¹

How the Reversal Moves Through the Network

Once submitted, the reversal travels the same infrastructure as the original payment:

You send the request to your bank, the Originating Depository Financial Institution (ODFI).
Your bank formats and transmits the reversing entry to the ACH operator, either the Federal Reserve or the Electronic Payments Network.
The ACH operator routes the entry to the receiving bank, the Receiving Depository Financial Institution (RDFI).
The receiving bank attempts to pull the funds from the receiver’s account and return them.

Electronic routing usually takes one to two business days from submission. If the funds are still in the receiver’s account, the reversal completes and the money flows back.

When a Reversal Is Dishonored

The receiving bank isn’t obligated to accept every reversal. It can dishonor the entry if the receiver’s account has insufficient funds, the account is closed, or the reversal doesn’t comply with Nacha rules. Specific return reason codes reject an improper reversal: R11 for consumer accounts and R17 for non-consumer accounts.¹

A dishonored reversal doesn’t automatically get the sender their money. At that point the originator’s options are the same as if the deadline had lapsed: ask the receiver directly, or go to court.

Reversal vs. Return

These two mechanisms are often confused, and the distinction matters when you’re deciding what to ask your bank for.

A reversal is initiated by the original sender to fix the sender’s own mistake.
A return is initiated by the receiving bank when a transaction can’t be completed — the account is closed, funds are insufficient, or the account holder disputes the charge.

Different starter, different reason, different rules and deadlines.

If You’re the Consumer Whose Account Was Hit

If an unauthorized or erroneous ACH transaction hits your personal account, the ACH reversal process isn’t your tool — it’s the sender’s tool. Your route is Regulation E, the federal rule the Consumer Financial Protection Bureau enforces for electronic fund transfers on consumer accounts.

Reporting Deadlines and What You Could Owe

Your liability depends on how quickly you report:

Report an unauthorized transfer within two business days of learning about it, and your liability is capped at $50 or the amount of the unauthorized transfers before you gave notice, whichever is less.³
Report after two business days but within 60 days of receiving your statement, and your maximum liability rises to $500.³
Report after 60 days and you could be liable for the full amount of unauthorized transfers that happen after the 60-day window closes, if the bank can show they wouldn’t have occurred had you reported sooner.

State law or your account agreement may set a lower liability cap. If so, the lower cap applies.

How Long Your Bank Has to Investigate

Once you report an error, the bank has 10 business days to investigate and resolve it. The bank can extend the investigation to 45 days, but only if it provisionally credits your account within those first 10 business days, and you must have full use of the credited funds during the review.⁴

For certain transactions — point-of-sale debit card purchases, transfers not initiated within the United States, and transfers within the first 30 days of the account being opened — the extended period is 90 days instead of 45.⁴

Stopping a Recurring Debit

You can also stop a recurring ACH debit before it hits. Give your bank a stop payment order at least three business days before the scheduled payment. You can do this by phone, in person, or in writing, though the bank may require written confirmation within 14 days of an oral request. A stop payment blocks the debit but doesn’t cancel the underlying contract with whoever is billing you.⁵

Costs and Risks of Filing a Reversal

Fees vary by bank. Some institutions include ACH reversals in standard business account services; others charge a per-item fee. If a reversal comes back and your account can’t cover it, expect an overdraft or returned-item fee on top. The Federal Reserve’s FedACH service also charges originating banks $0.0035 per forward or return item for standard electronic processing, with a $45 fee for exception returns handled by facsimile or same-day processing — those are wholesale charges to banks, not to you directly.⁶ Ask your bank for its specific fee schedule before you file.

An originator who files a reversal also takes on an indemnification obligation, meaning the sender is responsible for any losses the receiving bank incurs because of the reversal. For federal government agencies, that liability is capped at the amount of the original entry.⁷ Private-sector originators face a similar indemnification requirement under the Nacha rules. If the reversal turns out to be improper, the sender bears the cost.

Misuse of the reversal process can also draw Nacha enforcement through its National System of Fines or arbitration process. Willful or reckless violations affecting at least 500 entries or totaling at least $500,000 can be classified as egregious, and the most serious classification carries fines of up to $500,000 per occurrence and can result in the originator being suspended from the network.¹ File a reversal when you have a real error and a clear deadline. Anything else, use a different remedy.

1
Nacha. ACH Network Rules: Reversals and Enforcement
2
U.S. Department of the Treasury Bureau of the Fiscal Service. Trace Number
3
Consumer Financial Protection Bureau. Section 1005.6 Liability of Consumer for Unauthorized Transfers
4
Consumer Financial Protection Bureau. Section 1005.11 Procedures for Resolving Errors
5
Consumer Financial Protection Bureau. How Can I Stop a Payday Lender From Electronically Taking Money Out of My Bank or Credit Union Account
6
Federal Reserve Banks. FedACH Services 2026 Fee Schedule
7
eCFR. Title 31 Section 210.6 – Agencies