Section 12-713 - Determination of income within this state of nonresident trusts and estates(a) The income derived from or connected with sources within this state of a nonresident estate or trust shall be determined as follows: (1) There shall be determined its share of income, gain, loss and deduction from Connecticut sources under section 12-714.(2) There shall be added or subtracted, as the case may be, the amount derived from or connected with Connecticut sources of any income, gain, loss and deduction which would be included in the determination of federal adjusted gross income if the estate or trust were an individual and which is recognized for federal income tax purposes but excluded from the definition of federal distributable net income of the estate or trust. In the case of a trust, there shall be added the amount of any includable gain, reduced by any deductions properly allocable thereto, upon which tax is imposed for the taxable year pursuant to Section 644 of the Internal Revenue Code. The source of such income, gain, loss and deduction shall be determined in accordance with the applicable rules of section 12-711 as in the case of a nonresident individual.(b) Deductions with respect to capital losses and net operating losses shall be based solely on income, gains, losses and deductions derived from or connected with sources within this state, under rules or regulations of the commissioner, but otherwise determined in the same manner as the corresponding federal deductions.Conn. Gen. Stat. § 12-713
( June Sp. Sess. P.A. 91-3, S. 64, 168.)