> ## Documentation Index
> Fetch the complete documentation index at: https://docs.baselayer.com/llms.txt
> Use this file to discover all available pages before exploring further.

# tin_match_type Field

> Mar 14, 2026

Business search and TIN verification responses now include a `tin_match_type` field, returning the specific type of match according to the IRS.

The possible values are `EIN`, `SSN` or `UNKNOWN`.

This gives you more granular insight into TIN verification results beyond a simple pass/fail, making it easier to build nuanced decisioning logic around TIN checks.

Identifying sole proprietors or individuals who have submitted a SSN in their business applications is now possible.

Reach out to your Baselayer representative for more information.


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