BAU Beginning Segment for the Debit Authorization

To identify the beginning of the Debit Authorization Transaction Set; the BAU segment is used to identify the financial institution and account of the payer (i.e., the party authorizing the debit against its account)

Position: BAU-01 · Element: 127 · Name: Reference Identification · Type: String (AN) · Requirement: Mandatory · Min: 1 · Max: 80 · Repeat: 1

Reference information as defined for a particular Transaction Set or as specified by the Reference Identification Qualifier

BAU01 is assigned by the account holder's application and relevant as an application trace number.

Position: BAU-02 · Element: 591 · Name: Payment Method Code · Type: Identifier (ID) · Requirement: Mandatory · Min: 3 · Max: 3 · Repeat: 1

Code identifying the method for the movement of payment instructions

Position: BAU-03 · Element: 506 · Name: (DFI) ID Number Qualifier · Type: Identifier (ID) · Requirement: Mandatory · Min: 2 · Max: 2 · Repeat: 1

Code identifying the type of identification number of Depository Financial Institution (DFI)

Position: BAU-04 · Element: 507 · Name: (DFI) Identification Number · Type: String (AN) · Requirement: Mandatory · Min: 3 · Max: 12 · Repeat: 1

Depository Financial Institution (DFI) identification number

Position: BAU-05 · Element: 508 · Name: Account Number · Type: String (AN) · Requirement: Mandatory · Min: 1 · Max: 35 · Repeat: 1

Account number assigned

Position: BAU-06 · Element: 93 · Name: Name · Type: String (AN) · Requirement: Optional · Min: 1 · Max: 60 · Repeat: 1

Free-form name

BAU06 identifies the party holding the account being debited. If used, it further serves to identify the account holder to the financial institution.