TFM: Automated Clearing House (ACH) rules are the Operating Rules and the Operating Guidelines published by Nacha, a national association of regional member clearing house associations, ACH Operators and participating financial institutions located in the United States.

Green Book: As defined in Title 31 CFR part 210, the Automated Clearing House (ACH) rules are the Operating Rules and the Operating Guidelines published by Nacha, formerly NACHA – The Electronic Payments Association, a national association of regional member clearing house associations, ACH Operators and participating financial institutions located in the United States.