Tax ids were never meant to be used as a form of global identification. If you go look in a real bank core, you'll find this field does not have any uniqueness constraints.
Tax ids were never meant to be used as a form of global identification. If you go look in a real bank core, you'll find this field does not have any uniqueness constraints.
Why not? Two people with the same tax ID seems like a problem waiting to happen.
These schemas also support non-individuals with the same fields. EINs have a lot more edge cases than SSNs.