I have attached a link to an IRS web site that will provide some guidance on SMLLC's including the EIN issue:
https://www.irs.gov/businesses/small-businesses-self-employed/single-member-limited-liability-compan...
It's a little difficult to understand exactly the EIN's you are referring to. Since the IRS indicates that you should be using your SS# since this is a disregarded entity, I would recommend you just file your Schedule C using your SS# and include all income for this business on that form.
The issue of sending 1099s to the vendors; you have a couple of options:
- File amended 1099s
- Move forward with what you have done. If you receive any correspondence on the matter you can just indicate that you were confused as to what to do (being a small company) and that going forward you understand that you should be using your SS# for reporting. If they assess any penalty just ask for an abatement. I believe they will waive the penalty if you ask.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
