does an LLC or Corporation need to file a DBA ?
The laws requiring DBA registration extend to LLCs and Corporations. If the corporation conducts business under any name other than the exact legal name that appears on the LLC's or Corporation's formation documents, they are required to register it as a DBA. "Conducting business" can include marketing materials, letterhead, business cards, etc. in addition to actual business transactions. Also, banks generally require a corporate registration prior to opening a business bank account or establishing a line of credit.