Conn. Gen. Stat. § 12-344a: Additional amount added to tax.

(a) To the tax imposed by the provisions of this chapter, there shall be added an amount equal to thirty per cent of the tax so imposed and computed under said provisions. Said added amount so computed shall, upon its addition as aforesaid, constitute a part of the tax imposed and to be computed and assessed, become due and be paid, collected and enforced as provided in this chapter.

(b) With respect to the estate of any person whose death occurs on or after July 1, 1983, there shall be added to the tax imposed by the provisions of this chapter, including the amount of tax added in accordance with subsection (a) of this section, and subject to the provisions of subsection (c) of this section, an amount determined as ten per cent of the tax so imposed and computed under said provisions. The additional amount of tax determined in accordance with this subsection shall constitute a part of the tax imposed by the provisions of this chapter and shall be computed and assessed, become due and be paid, collected and enforced as provided in this chapter. The estate of any person whose death occurs prior to July 1, 1983, shall be subject to the provisions of this chapter applicable to such estate at the time of such person's death.

(c) The additional amount of tax imposed in accordance with subsection (b) of this section shall not be applicable with respect to any real property in the estate of the decedent passing to any natural or adopted descendant of the decedent, which real property is classified as farm land in accordance with section 12-107c at the time of the decedent's death.