A credit shall be allowed against the tax imposed under chapter 216 in the amount of any tax imposed and paid under sections 12-640 to 12-649, inclusive, with respect to a gift includable in the gross taxable estate of the donor under said chapter 216.
Conn. Gen. Stat. § 12-648
( June Sp. Sess. P.A. 91-3, S. 144, 168; May Sp. Sess. P.A. 92-5, S. 35, 37; P.A. 93-261, S. 1, 4.)