Conn. Gen. Stat. § 31-301c: Costs of appeal. Interest added to award affirmed on appeal.

(a) No costs shall be taxed in favor of either party on any such appeal either in the Compensation Review Board or in the Appellate Court, and no party shall be liable to pay any fees or costs in connection therewith, except the record fee on appeal to the Supreme Court; provided, if an appeal is taken to the Appellate Court from a decision of the Compensation Review Board, and such appeal is found by said court to be either frivolous or taken for the purpose of vexation or delay, said court may tax costs in its discretion against the person so taking the appeal.

(b) Whenever an employer or his insurer appeals an administrative law judge's award, and upon completion of the appeal process the employer or insurer loses such appeal, the Compensation Review Board or the Appellate Court, as the case may be, shall add interest on the amount of such award affirmed on appeal and not paid to the claimant during the pendency of such appeal, from the date of the original award to the date of the final appeal decision, at the rate prescribed in section 37-3a.