Appendix > Appendix > ACH File Structures > File Header Information
File Header Information
This is the information that would go in the file header for ACH formatted files.
Field Order
Field Description
Length
Character Position
Data Type
Required Field
1
Record Type Code
1
1
Numeric
M
2
Priority Code
2
2
Numeric
R
3
Immediate Destination
10
4
Char-Caps
M
4
Immediate Origin
10
14
Char-Caps
M
5
File Creation Date
6
24
Date
M
6
File Creation Time
4
30
Time
O
7
File ID Modifier
1
34
Alphanumeric
M
8
Record Size
3
35
Numeric
M
9
Blocking Factor
2
38
Numeric
M
10
Format Code
1
40
Numeric
M
11
Immediate Destination Name
23
41
Alphanumeric
O
12
Immediate Origin Name
23
64
Alphanumeric
O
13
Reference Code
8
87
Alphanumeric
O
 
End of Record
N/A
95
N/A
 
Required Field Key:
M: This field is mandatory and necessary to ensure proper routing and processing. The Operator will reject the file if this field is not included.
R: This field is required. If you omit this file, it will not cause the Operator to reject the entry, but may be rejected at the Receiving Depository Financial Institution (RDFI).
O: This field is optional at the discretion of the originator.
Published date: 06/04/2021