I've googled ad nauseum on this and can't seem to find a definitive answer. Do EINs and SSNs use different numbering space such that even though they are both 9-digit tax ID numbers (albeit dashes located in different places), you could never have an individual's SSN match an employer's EIN.
Or, is it in fact something that can and does happen? If it does happen, is it rare or very common? I would think collisions if common could create all kinds of headaches for everybody.
Thanks for any input.
========================================= MODERATOR'S COMMENT: No collisions. But blocks belong to individuals, other blocks belong to EIN holders, others to ITIN holders, etc.