26 U.S.C. § 691: Recipients of income in respect of decedents

the estate of the decedent, if the right to receive the amount is acquired by the decedent’s estate from the decedent; the person who, by reason of the death of the decedent, acquires the right to receive the amount, if the right to receive the amount is not acquired by the decedent’s estate from the decedent; or the person who acquires from the decedent the right to receive the amount by bequest, devise, or inheritance, if the amount is received after a distribution by the decedent’s estate of such right. If a right, described in paragraph (1), to receive an amount is transferred by the estate of the decedent or a person who received such right by reason of the death of the decedent or by bequest, devise, or inheritance from the decedent, there shall be included in the gross income of the estate or such person, as the case may be, for the taxable period in which the transfer occurs, the fair market value of such right at the time of such transfer plus the amount by which any consideration for the transfer exceeds such fair market value. For purposes of this paragraph, the term “transfer” includes sale, exchange, or other disposition, or the satisfaction of an installment obligation at other than face value, but does not include transmission at death to the estate of the decedent or a transfer to a person pursuant to the right of such person to receive such amount by reason of the death of the decedent or by bequest, devise, or inheritance from the decedent. The right, described in paragraph (1), to receive an amount shall be treated, in the hands of the estate of the decedent or any person who acquired such right by reason of the death of the decedent, or by bequest, devise, or inheritance from the decedent, as if it had been acquired by the estate or such person in the transaction in which the right to receive the income was originally derived and the amount includible in gross income under paragraph (1) or (2) shall be considered in the hands of the estate or such person to have the character which it would have had in the hands of the decedent if the decedent had lived and received such amount. an amount equal to the excess of the face amount of such obligation over the basis of the obligation in the hands of the decedent (determined under section 453B) shall, for the purpose of paragraph (1), be considered as an item of gross income in respect of the decedent; and such obligation shall, for purposes of paragraphs (2) and (3), be considered a right to receive an item of gross income in respect of the decedent, but the amount includible in gross income under paragraph (2) shall be reduced by an amount equal to the basis of the obligation in the hands of the decedent (determined under section 453B). the second sentence of paragraph (2) shall be applied by inserting “(other than the obligor)” after “or a transfer to a person”, any cancellation of such an obligation shall be treated as a transfer, and any cancellation of such an obligation occurring at the death of the decedent shall be treated as a transfer by the estate of the decedent (or, if held by a person other than the decedent before the death of the decedent, by such person). In any case to which the first sentence of paragraph (2) applies by reason of subparagraph (A), if the decedent and the obligor were related persons (within the meaning of section 453(f)(1)), the fair market value of the installment obligation shall be treated as not less than its face amount. For purposes of subparagraph (A), an installment obligation which becomes unenforceable shall be treated as if it were canceled. to the estate of the decedent; except that if the estate of the decedent is not liable to discharge the obligation to which the deduction or credit relates, to the person who, by reason of the death of the decedent or by bequest, devise, or inheritance acquires, subject to such obligation, from the decedent an interest in property of the decedent. In the case of the deduction specified in section 611, to the person described in subsection (a)(1)(A), (B), or (C) who, in the manner described therein, receives the income to which the deduction relates, in the taxable year when such income is received. A person who includes an amount in gross income under subsection (a) shall be allowed, for the same taxable year, as a deduction an amount which bears the same ratio to the estate tax attributable to the net value for estate tax purposes of all the items described in subsection (a)(1) as the value for estate tax purposes of the items of gross income or portions thereof in respect of which such person included the amount in gross income (or the amount included in gross income, whichever is lower) bears to the value for estate tax purposes of all the items described in subsection (a)(1). In the case of an estate or trust, the amount allowed as a deduction under subparagraph (A) shall be computed by excluding from the gross income of the estate or trust the portion (if any) of the items described in subsection (a)(1) which is properly paid, credited, or to be distributed to the beneficiaries during the taxable year. The term “estate tax” means the tax imposed on the estate of the decedent or any prior decedent under section 2001 or 2101, reduced by the credits against such tax. The net value for estate tax purposes of all the items described in subsection (a)(1) shall be the excess of the value for estate tax purposes of all the items described in subsection (a)(1) over the deductions from the gross estate in respect of claims which represent the deductions and credit described in subsection (b). Such net value shall be determined with respect to the provisions of section 421(c)(2), relating to the deduction for estate tax with respect to stock options to which part II of subchapter D applies. The estate tax attributable to such net value shall be an amount equal to the excess of the estate tax over the estate tax computed without including in the gross estate such net value. In the case of any tax imposed by chapter 13 on a taxable termination or a direct skip occurring as a result of the death of the transferor, there shall be allowed a deduction (under principles similar to the principles of this subsection) for the portion of such tax attributable to items of gross income of the trust which were not properly includible in the gross income of the trust for periods before the date of such termination. For purposes of sections 1(h), 1202, and 1211, the amount taken into account with respect to any item described in subsection (a)(1) shall be reduced (but not below zero) by the amount of the deduction allowable under paragraph (1) of this subsection with respect to such item. as an annuity under a joint and survivor annuity contract where the decedent annuitant died after the annuity starting date (as defined in section 72(c)(4)), and during the surviving annuitant’s life expectancy period, by determining the excess of the value of the annuity at the date of the death of the deceased annuitant over the total amount excludable from the gross income of the surviving annuitant under section 72 during the surviving annuitant’s life expectancy period, and by multiplying the figure so obtained by the ratio which the value of the annuity for estate tax purposes bears to the value of the annuity at the date of the death of the deceased. The term “life expectancy period” means the period beginning with the first day of the first period for which an amount is received by the surviving annuitant under the contract and ending with the close of the taxable year with or in which falls the termination of the life expectancy of the surviving annuitant. For purposes of this subparagraph, the life expectancy of the surviving annuitant shall be determined, as of the date of the death of the deceased annuitant, with reference to actuarial tables prescribed by the Secretary. The surviving annuitant’s expected return under the contract shall be computed, as of the death of the deceased annuitant, with reference to actuarial tables prescribed by the Secretary. For application of this section to income in respect of a deceased partner, see section 753.