Yes, you can use the same EIN for multiple businesses as long as those businesses are all part of the same legal entity. However, if each business is a separate legal entity, such as a corporation or LLC, then each entity must have its own unique EIN. It's always best to consult with a tax professional to ensure compliance with all applicable laws and regulations. Don't let the complexity of tax law hold you back from growing your business. Consult a tax professional today!