Conn. Gen. Stat. § 12-208

(b) Any company subject to any tax or charge under this chapter that is aggrieved because of any order, decision, determination or disallowance of the Commissioner of Revenue Services made under this chapter may, not later than thirty days after service of notice of such order, decision, determination or disallowance, take an appeal therefrom to the superior court for the judicial district of New Britain, which appeal shall be accompanied by a citation to the Commissioner of Revenue Services to appear before said court. Such citation shall be signed by the same authority, and such appeal shall be returnable at the same time and served and returned in the same manner, as is required in case of a summons in a civil action. The authority issuing the citation shall take from the appellant a bond or recognizance to the state of Connecticut, with surety, to prosecute the appeal to effect and to comply with the orders and decrees of the court in the premises. Such appeals shall be preferred cases, to be heard, unless cause appears to the contrary, at the first session, by the court or by a committee appointed by the court. Said court may grant such relief as may be equitable and, if such tax or charge has been paid prior to the granting of such relief, may order the Treasurer to pay the amount of such relief, with interest at the rate of two-thirds of one per cent per month or fraction thereof, to such aggrieved person. If the appeal has been taken without probable cause, the court may tax double or triple costs, as the case demands; and, upon all such appeals which are denied, costs may be taxed against the appellant at the discretion of the court, but no costs shall be taxed against the state.

“Tax” includes penalties and interest. 164 C. 497.

Taxes paid under protest can be recovered only where statute so provides. 16 CS 134. Cited. 31 CS 134.