State of Connecticut General Statute Section 35-1(a) requires any person doing business in Connecticut, except as provided by statute, under any name other than the name of the person or persons conducting or transacting business, must register a Trade Name Certificate with the Town Clerk's office in the town where the business is or is to be conducted or transacted.  The filing fee for a Trade Name Certificate is $5.00.

In addition, the State of Connecticut has a couple of websites to help new and already-established businesses get answers and information regarding starting or expanding their businesses