You stated EFIN when I"m sure you mean FEIN (Federal Employer Identification Number). It's more commonly referred to as just an EIN. An EIN is issued to a business, not an individual. EIN's are only issued by the IRS, and no other entity. The EIN is tied to a specific social security number. The only two entities that know (and have a right to know) what SSN an EIN is tied to, is the person who owns the SSN that EIN is issued under, and the IRS. That's it. Nobody else needs to know. (with one exception of your state taxing authority if your state taxes personal income.)
If you allow someone else to use your EIN, then you and you alone are ONE HUNDRED PERCENT responsible for any and all taxes due for the EIN. You could also have other legal obligations outside of taxes. For example, if the business using that EIN is sued, then **YOU** are the one who will be appearing in court as the legally recognized owner of that business with primary responsibility for ALL actions (or lack of action) of the business.
So if someone else needs an EIN, they can get their own in about 10 minutes or less, for ABSOLUTELY FREE at https://www.irs.gov/businesses/small-businesses-self-employed/apply-for-an-employer-identification-n...
