Conn. Gen. Stat. § 12-351: Administration expenses not deductible.

The following expenses of administration shall not be allowable deductions: (a) The federal estate tax and succession, inheritance, estate or transfer taxes paid or payable to other states, territories, the District of Columbia, foreign countries or governmental subdivisions thereof; (b) expenses of care, maintenance or repair of real estate and buildings accrued subsequent to the death of the transferor; (c) interest on obligations of the transferor or of the estate, which interest accrued subsequent to the death of the transferor; (d) property taxes, except the tax on untaxed property assessed by the state against the estate, assessed as of a date subsequent to the death of the transferor; (e) income taxes accrued subsequent to the death of the transferor; (f) expenses incurred and taxes assessed upon and in connection with real estate and tangible personal property situated outside this state; (g) all other charges and expenses of administration properly allocable against income.