Conn. Gen. Stat. § 12-306b
Sec. 12-306b. Penalty for wilful failure to submit a required report or pay the tax, or for wilful delivery of a document known to be false.
(b) Any person who wilfully delivers or discloses to the commissioner or the commissioner's authorized agent any list, report, account, statement, or other document, known by such person to be fraudulent or false in any material matter, shall, in addition to any other penalty provided by law, be guilty of a class C felony. No person shall be charged with an offense under both subsections (a) and (b) of this section in relation to the same tax period but such person may be charged and prosecuted for both such offenses upon the same information.