We hate to break it to you... but unless you just got an EIN for your new business, you definitely need one. Here's the why and the how, of why you need an EIN number and how to get one. What if you already have an EIN? Can it be converted to your new LLC?No, EINs cannot be shared between businesses or converted. Every new LLC needs a new EIN. The LLC you are forming is a brand new entity and req