ACH transaction codes

The Automated Clearing House (ACH) is the backbone of the nation’s electronic payments system. ACH moves billions of dollars every day from one bank account to another, and from bank accounts to vendors, at a tiny cost per transaction. Most transactions clear within one business day. ACH transactions are a fixture in all of our financial lives, in one form or another, whether in the form of a direct deposit, a tax refund, or a peer-to-peer payment.

Every ACH transaction submitted for processing must be accompanied by the correct two-digit ACH transaction code to mark it as a debit from one account and a credit to a different account.There are too many codes to detail in one post, but let’s explore the most common ACH transaction codes in several categories.

Before reviewing the codes, here are a few helpful acronyms and what they stand for:

NOC: A notification of change simply indicates something about a bank account has changed, such as an account or routing number.
CCD: A cash concentration or disbursement is a business-to-business (B2B) transaction. It can be either a credit or a debit used to make transfers internally and to external suppliers.
CTX: Businesses and government entities use the corporate trade exchange system to make recurring payments to a number of parties with a single funds transfer.

Just so you know

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Banks initiate entries into the ACH network by coding the transaction as a debit or credit to a merchant’s account. Other typical account types include consumer and loan accounts. The most frequently used codes are listed below.

Checking credits

Code	Description
21	Automated return or NOC for a checking credit (codes 22, 23, and 24)
22	Automated deposit (checking credit)
23	Prenotification for a checking credit
24	Zero dollar entries with remittance data (for CCD and CTX entries only)

Checking debits

Code	Description
26	Automated return or NOC for a checking debit
27	Checking withdrawal (debit)
28	Prenotification for a checking debit
29	Zero dollar entries with remittance data (for CCD and CTX entries only)

Savings credits

Code	Description
31	Automated return or NOC for a savings credit
32	Savings credit
33	Prenotification for a savings credit
34	Zero dollar entries with remittance data (for CCD and CTX entries only)

Savings debits

Code	Description
36	Automated return or NOC for a savings debit
37	Savings debit
38	Prenotification for a savings debit
39	Zero dollar entries with remittance data (for CCD and CTX entries only)

Financial institution general ledger (GL) credits

Code	Description
41	Automated return or NOC
42	GL credit
43	Prenotification of a GL credit
44	Zero dollar entries with remittance data (for CCD and CTX entries only)

This article is originally published on May 18, 2020, and updated on Dec 08, 2021.