Section 12-647 - Payment of tax. Penalty for late payment. Extensions. Changes in federal gift tax. Overpayments(a) The tax imposed under this chapter shall be due and payable by the donor no later than April fifteenth following the close of the calendar year during which the gift was made and shall be payable to the Commissioner of Revenue Services. The return required under section 12-644 shall accompany such payment. Where a gift is made during the calendar year in which the donor dies, the last date for paying the tax required under this chapter shall be the last date, including extensions, for filing the estate tax return under chapter 217 with respect to such donor. If any person fails to pay the amount of tax reported to be due on such return within the time specified under the provisions of this section, there shall be imposed a penalty equal to ten per cent of such amount due and unpaid or fifty dollars, whichever is greater. Such amount shall bear interest at the rate of one per cent per month or fraction thereof, from the due date of such return.(b) The commissioner for good cause may extend the time for making any return and paying any amount required to be paid under this chapter if a written request therefor is filed with the commissioner together with a tentative return which must be accompanied by a payment of the tax, which shall be estimated in such tentative return, on or before the last day for filing the return. Any person to whom an extension is granted shall pay, in addition to the tax, interest at the rate of one per cent per month or fraction thereof from the date on which the tax would have been due without the extension until the date of payment.(c) If the amount of a taxpayer's taxable gifts, for federal gift tax purposes, reported on such taxpayer's federal gift tax return for any calendar year, is changed or corrected by the United States Internal Revenue Service or other competent authority, the taxpayer shall report such change or correction in federal taxable gifts within ninety days after the final determination of such change or correction, and shall concede the accuracy of such determination or state wherein it is erroneous. Any taxpayer filing an amended federal gift tax return shall also file within ninety days thereafter an amended return under this chapter and shall give such information as the commissioner may require. The time for filing such report or amended return may be extended by the commissioner upon due cause shown. Notwithstanding any limitation of time in this chapter, if, upon examination, the commissioner finds that such taxpayer is liable for the payment of an additional tax, he shall, within a reasonable time from the receipt of such report or amended return, notify such taxpayer of the amount of such additional tax, together with interest thereon computed at the rate of one per cent per month or fraction thereof from the date when the original tax became due and payable. Within thirty days of the mailing of such notice, the taxpayer shall pay the commissioner the amount of such additional tax and interest. If, upon examination of such report or amended return and related information, the commissioner finds that the taxpayer has overpaid the tax due the state, the commissioner shall certify the amount of such overpayment, together with interest as provided in subsection (d) of this section, to the Comptroller, and such amount shall be paid to the taxpayer by the State Treasurer upon order of the Comptroller.(d)(1) Whenever there is an overpayment of the tax imposed by this chapter, the commissioner shall return to the taxpayer the overpayment, which shall bear interest at the rate of two-thirds of one per cent per month or fraction thereof, as provided in subdivisions (2) and (3) of this subsection.(2) In case of such overpayment pursuant to a tax return, no interest shall be allowed or paid under this subsection on such overpayment for any month or fraction thereof prior to (A) the ninety-first day after the last day prescribed for filing the tax return associated with such overpayment, determined without regard to any extension of time for filing, or (B) the ninety-first day after the date such return was filed, whichever is later.(3) In case of such overpayment pursuant to an amended tax return, no interest shall be allowed or paid under this subsection on such overpayment for any month or fraction thereof prior to the ninety-first day after the date such amended tax return was filed.Conn. Gen. Stat. § 12-647
( June Sp. Sess. P.A. 91-3, S. 143, 168; May Sp. Sess. P.A. 92-5, S. 34, 37; P.A. 94-5, S. 1, 2; P.A. 95-26, S. 35, 52; P.A. 06-194, S. 21; P.A. 13-232, S. 6.)