Comerica positive pay file format
There is no single fixed layout. You define your own file map in Comerica's treasury tools.
Independent documentation. Not affiliated with or endorsed by Comerica.
Build a matching file with the free generator: pick a generic layout or use the custom builder, then map it once in Comerica's treasury tools. Your check data never leaves your computer.
How Comerica check issue files work
- Comerica does not publish a fixed positive pay layout.
- Its administration guide references client-defined "Positive Pay and Image Services Template Definitions," which means your file template is registered per client.
Required data: account number, check number, amount, and issue date; confirm the template details with your treasury contact.
Source: Comerica Customer Administration Tool user guide. Reference. Banks can change their requirements; the bank portal is the authoritative reference.
How to create a Comerica positive pay file
Because Comerica reads whatever layout you register in its portal, the simplest approach is a clean CSV. In the generator, choose the generic CSV layout (or build your own in the custom builder), create the file from your check register, then define the matching file map in Comerica's treasury tools once. After that, every check run is the same two steps: generate the file, upload it. Always verify your first file with a test upload.