Conn. Gen. Stat. § 12-420b

(b) In performing a reconciliation of a managed compliance agreement the commissioner and the eligible taxpayer may agree to waive amounts either due the commissioner or due the eligible taxpayer, provided such amounts fall within a range that the commissioner determines shall apply to all eligible taxpayers entering into managed compliance agreements. Such range, which may be either a monetary amount or a percentage, shall be announced by the commissioner in accordance with the provisions of subsection (b) of section 12-2 and may be changed in accordance with said subsection (b), (1) on a prospective basis for agreements entered into after the effective date of such announced change, or (2) on a retroactive basis for agreements existing on the effective date of such announced change upon agreement by the commissioner and the eligible taxpayer.

(c) The commissioner may, in the commissioner's sole discretion, terminate a managed compliance agreement and conduct an audit of an eligible taxpayer under subsection (a) of section 12-415 , if the eligible taxpayer fails to fulfill any of the terms of a managed compliance agreement and such failure is materially adverse to the commissioner and the taxpayer fails to cure such failure not later than thirty days after the mailing of written notice of such failure by the commissioner, provided no such notice need be given in the event such failure is not capable of being cured or the commissioner believes that the collection of any tax required to be collected and paid to the state or of any assessment or reassessment will be jeopardized by delay. Any such termination shall be effective on the first day of the fourth month following the month in which notice of such termination is given by the commissioner to the taxpayer, except that such termination shall take effect immediately if such failure is not capable of being cured or if the commissioner believes that the collection of any tax required to be collected and paid to the state or of any assessment or reassessment will be jeopardized by delay.

(d) Nothing in this section shall abridge or alter any other requirements, rights or obligations of an eligible taxpayer or the commissioner granted or imposed by statute or regulation, including, but not limited to, penalties for negligence or intentional disregard of the provisions of this chapter, except as provided in subsection (c) of this section; penalties for failure to file returns or for fraud or intent to evade the provisions of this chapter; limitation periods and waivers of limitation periods; the right of an eligible taxpayer to file a written protest under section 12-418 ; the right of an eligible taxpayer to appeal an assessment or a reassessment under section 12-422 ; or the right of an eligible taxpayer to claim a refund under section 12-425 .