I would like to know for sure also on this topic.. The wording on the W-9 instruction part seems to be clear in one regard but then it seems to contradict itself below. first from the instructions:

If you are a single-member LLC that is disregarded as an entity separate from its owner, enter the owner’s SSN (or EIN, if the owner has one). Do not enter the disregarded entity’s EIN. If the LLC is classified as a corporation or partnership, enter the entity’s EIN

ok.. so where it says: If you are a single-member LLC that is disregarded as an entity separate from its owner, enter the owner’s SSN (or EIN, if the owner has one). Do not enter the disregarded entity’s EIN.

it talks about, or, EIN, if the owner has one.. i read that as if the owner, the person has an EIN in addition, separate from the LLC's EIN.  I do a lot of single member LLCs, all have an EIN but not one of them has an owner, a person that has their own EIN for the person.  any thoughts?