My first wish is to say yes, because it is essentially an SSN corporation that I would encrypt. However, I'm not sure if SOX or federal guidelines really require encryption. Does anyone know for sure?
My rule: if you need to ask, the answer is probably yes
But I agree with @Adam, you should ask a lawyer about legal issues.
, EIN - - 10-K, D & B, , , .
After further research, there seems to be no special requirement that the tax ID (or SSN, for that matter) be encrypted in the data layer, however, they should be hidden when presented to users.
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