Example: Interest income received by a resident individual on bonds issued by or on behalf of the State of California and the District of Columbia shall be added to her federal adjusted gross income in arriving at her Connecticut adjusted gross income, as this interest income is subject to Connecticut income tax but not to federal income tax. However, interest income received by such individual on bonds issued by or on behalf of Guam and the State of Connecticut is not to be added to federal adjusted gross income, as this interest income is not subject to Connecticut income tax.
Example: A resident individual receives $1000 in exempt-interest dividends from a mutual fund that owns governmental obligations issued by various states, including Connecticut, and by the Territory of Guam. If 45% of the exempt-interest dividends was derived from Connecticut obligations, 20% from New York obligations, 10% from Massachusetts obligations and 25% from Guam obligations, then the amount that is to be added to federal adjusted gross income is $300 (that is, the percentage of exempt-interest dividends that is not derived from Connecticut obligations and other obligations, the direct taxation of which by any state is prohibited by federal law). The percentage of exempt-interest dividends derived from Connecticut obligations and Guam obligations is not to be added to federal adjusted gross income.
Example 2: Resident individuals who file a joint Connecticut income tax return have, for federal income tax purposes, a long-term capital gain of $5,000 arising from the sale of stock and a long-term capital loss of $2,000 arising from the sale of Connecticut obligations. Any loss from the sale or exchange of Connecticut obligations is required to be added to federal adjusted gross income, to the extent properly includible in determining the net gain or loss from sales or other dispositions of capital assets for federal income tax purposes, in the taxable year such loss was recognized, even if, for federal income tax purposes, gains from sales or other dispositions of capital assets exceed losses therefrom. Accordingly, the federal adjusted gross income of these individuals shall be increased by $2,000, the amount of loss derived from the sale or exchange of the Connecticut obligations.
Conn. Agencies Regs. § 12-701(a)(20)-2