ACH Reversal

An ACH reversal is an entry that an originator sends through the Automated Clearing House network to correct an earlier ACH entry that was sent in error. A reversing debit takes back an erroneous credit, and a reversing credit refunds an erroneous debit. Reversals let businesses fix mistakes such as paying an employee twice or debiting a customer for the wrong amount, without asking the receiver to send money back by other means.

Reversals are tightly limited by the Nacha Operating Rules. They are allowed only for specific kinds of error and only within a short time, because they move money out of, or into, someone's account without new consent. They should not be confused with an ACH return, which is sent by the receiving bank, nor with the general idea of a payment reversal in other systems, such as card refunds or authorisation reversals.

The rules permit a reversal only for an erroneous entry, defined narrowly. The main cases are:

• Duplicate entries. The same payment was sent twice, for example when a payroll file was uploaded again by mistake.
• Wrong receiver. The entry was sent to or from an account other than the one intended.
• Wrong amount. The amount differs from what the originator intended.
• Wrong timing. A debit was settled earlier than intended or a credit later than intended.

A reversal may not be used to recover money for other reasons, such as an employee who resigned after payroll was sent, a customer who has not delivered goods, or a business dispute. Those situations must be handled outside the ACH network, or with the receiver's agreement, for example by a new, separately authorized debit.

The reversing entry must be sent so that it is available to the receiving bank within five banking days after the settlement date of the erroneous entry. The batch carrying it must use the word REVERSAL in its company entry description field, so that receivers and banks can recognise the purpose. The reversing entry must mirror the original, using the same account, amount and entry class, except for the direction of the transaction. Where a whole file was duplicated or contained errors, the ODFI can send a reversing file, which must also be sent within five banking days and promptly after the error is discovered.

The originator must make a reasonable attempt to tell the receiver about the reversal and the reason for it no later than the settlement date of the reversing entry. For payroll, this usually means contacting the employee directly before the money is taken back.

If the deadline is missed, the originator can no longer use a reversal and must ask the receiver to return the money voluntarily, or pursue it under the contract or through the courts.

The ODFI sends the reversal and warrants to the network that it meets the rules. The RDFI posts it like any other entry, but if the receiver says the reversal was improper, for example because the original entry was correct, the RDFI may return it as unauthorized within the allowed time. If the account no longer holds enough money, a reversing debit can be returned for insufficient funds, leaving the originator to recover the money directly. A reversal therefore offers no guarantee of recovery.

Payroll providers and accounts payable teams are the heaviest users of reversals, since duplicate or misdirected credits are their most common errors. Good controls, such as file totals checks before upload, duplicate detection, approval steps and payment reconciliation after each run, reduce the need for them. Firms that use an ACH API from a payment provider often see a "reverse" function that builds the correct entry automatically, but the same rules on purpose, timing and notice still apply.

Because reversals bypass the receiver's consent, misuse attracts close attention. Nacha has tightened the rules over time, including the requirement for the REVERSAL description and clearer limits on permissible reasons, after cases where originators used reversals to claw back wages or settle disputes. Improper reversals can lead to rules violations for the ODFI and complaints under consumer protection law. For payments that were correct but are now unwanted, alternatives include a payment recall request, a negotiated refund or, for benefit payments after a death, ACH reclamation.

• Nacha