Answer:
There are no specific requirements for ACH large item (over $2500) returns. Naturally, for an item to be returned that is NSF, you must follow the NACHA rules for returns (24 hrs of the item receipt). If the ACH item is unauthorized, you have up to sixty days from the date of notification and you must have a signed affidavit on file.
First published on BankersOnline.com 2/4/02