
ACH Reversals Explained for Small Businesses: When You Can Correct a Payment—and When You Need a Return
Under the Nacha Operating Rules, an ACH reversal corrects only a sender's qualifying error—a duplicate, wrong amount, wrong account, or qualifying wrong date—and must reach the receiving bank within five banking days of settlement. This guide explains how reversals differ from returns and R10/R11 unauthorized-debit claims, and how to record each event so payments stay reconcilable.










