The grantor shall be treated as the owner of any portion of a trust in respect of which the beneficial enjoyment of the corpus or the income therefrom is subject to a power of disposition, exercisable by the grantor or a nonadverse party, or both, without the approval or consent of any adverse party.

Subsection (a) shall not apply to the following powers regardless of by whom held:

(1) Power to apply income to support of a dependent A power described in section 677(b) to the extent that the grantor would not be subject to tax under that section.

(2) Power affecting beneficial enjoyment only after occurrence of event A power, the exercise of which can only affect the beneficial enjoyment of the income for a period commencing after the occurrence of an event such that a grantor would not be treated as the owner under section 673 if the power were a reversionary interest; but the grantor may be treated as the owner after the occurrence of the event unless the power is relinquished.

(3) Power exercisable only by will A power exercisable only by will, other than a power in the grantor to appoint by will the income of the trust where the income is accumulated for such disposition by the grantor or may be so accumulated in the discretion of the grantor or a nonadverse party, or both, without the approval or consent of any adverse party.

(4) Power to allocate among charitable beneficiaries A power to determine the beneficial enjoyment of the corpus or the income therefrom if the corpus or income is irrevocably payable for a purpose specified in section 170(c) (relating to definition of charitable contributions) or to an employee stock ownership plan (as defined in section 4975(e)(7)) in a qualified gratuitous transfer (as defined in section 664(g)(1)).

A power to distribute corpus either—

(A) to or for a beneficiary or beneficiaries or to or for a class of beneficiaries (whether or not income beneficiaries) provided that the power is limited by a reasonably definite standard which is set forth in the trust instrument; or

(B) to or for any current income beneficiary, provided that the distribution of corpus must be chargeable against the proportionate share of corpus held in trust for the payment of income to the beneficiary as if the corpus constituted a separate trust.

A power to distribute or apply income to or for any current income beneficiary or to accumulate the income for him, provided that any accumulated income must ultimately be payable—

(A) to the beneficiary from whom distribution or application is withheld, to his estate, or to his appointees (or persons named as alternate takers in default of appointment) provided that such beneficiary possesses a power of appointment which does not exclude from the class of possible appointees any person other than the beneficiary, his estate, his creditors, or the creditors of his estate, or

(B) on termination of the trust, or in conjunction with a distribution of corpus which is augmented by such accumulated income, to the current income beneficiaries in shares which have been irrevocably specified in the trust instrument.

A power exercisable only during—

(A) the existence of a legal disability of any current income beneficiary, or

(B) the period during which any income beneficiary shall be under the age of 21 years,

(8) Power to allocate between corpus and income A power to allocate receipts and disbursements as between corpus and income, even though expressed in broad language.

Subsection (a) shall not apply to a power solely exercisable (without the approval or consent of any other person) by a trustee or trustees, none of whom is the grantor, and no more than half of whom are related or subordinate parties who are subservient to the wishes of the grantor—

(1) to distribute, apportion, or accumulate income to or for a beneficiary or beneficiaries, or to, for, or within a class of beneficiaries; or

(2) to pay out corpus to or for a beneficiary or beneficiaries or to or for a class of beneficiaries (whether or not income beneficiaries).

Subsection (a) shall not apply to a power solely exercisable (without the approval or consent of any other person) by a trustee or trustees, none of whom is the grantor or spouse living with the grantor, to distribute, apportion, or accumulate income to or for a beneficiary or beneficiaries, or to, for, or within a class of beneficiaries, whether or not the conditions of paragraph (6) or (7) of subsection (b) are satisfied, if such power is limited by a reasonably definite external standard which is set forth in the trust instrument. A power does not fall within the powers described in this subsection if any person has a power to add to the beneficiary or beneficiaries or to a class of beneficiaries designated to receive the income or corpus except where such action is to provide for after-born or after-adopted children.

(Aug. 16, 1954, ch. 736, 68A Stat. 227; Pub. L. 99–514, title XIV, § 1402(b)(1), Oct. 22, 1986, 100 Stat. 2712; Pub. L. 100–647, title I, § 1014(a)(3), Nov. 10, 1988, 102 Stat. 3559; Pub. L. 105–34, title XV, § 1530(c)(6), Aug. 5, 1997, 111 Stat. 1078.)