If I own more than one corporation, do I need a separate EIN for each corporation?

Sheree Hipwell: You'll likely need to report your income for each corporation to the IRS separately, so yes, you will need an EIN for each corporation in order to do so. (If you have some sort of structure set up where you're reporting everything at once, then no, but it doesn't sound like it.) You might wish to contact the IRS to ask them, to be sure.