"NACHA Operating Rules require (Subsection 1.1.2) each Participating Depository Financial Institution shall conduct or have conducted audits of its compliance with these rules in accordance with Appendix Eight (Rule Compliance Audit Requirements). Audits must be completed by December 1 of each year." For more information visit http://www.nacha.org/

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2005 ACH Operating Rules and Guidelines detail how ACH payments are governed
http://pubs.nacha.org/
Purchase a copy of the National Automated Clearing House Association’s (NACHA) 2005 ACH Operating Rules and Guidelines to help ensure that you are in compliance with current regulations. Contact your regional payments association using the information online here. Contact FedACH Sales Specialist at you local Federal Reserve Bank or your district’s designated FedACH Central Operations Support site in Atlanta at (866) 234-5681 or in Minneapolis at (888) 883-2180.

ACH Rules Online! For additional information visit http://pubs.nacha.org/
When you purchase a copy of the 2005 ACH Rules and Operating Guidelines, you have access to the new Online edition. ACH Rules online has the same information available in the print edition, with full search and bookmarking capabilities and updates available as they are approved. The unique serial number label on the inside back cover of your book is your key to ACH Rules online.