Conn. Gen. Stat. § 12-419b: Failure to file return when no tax is due.

Any person required to file a return under the provisions of this chapter who fails to file such return within the time required in accordance with section 12-414 shall not be subject to the imposition of a penalty, as provided under section 12-30, when there is no tax due, with respect to such return. Such person may, however, be subject to the provisions of section 12-409 related to revocation of the permit of a seller for failure to comply with sales and use tax provisions.