Example. (a) Under the terms of a trust instrument, the trustee may accumulate the income or make distributions to A and B. The trustee may also invade corpus for the benefit of A and B. The distributable net income of the trust for the taxable year 1955 is $10,000. The trust had undistributed net income for the taxable year 1954 of $5,000, to which a tax of $1,100 was allocable. During the taxable year 1955, the trustee distributes $10,000 to A and $5,000 to B. Thus, of the total distribution of $15,000, A received two-thirds and B received one-third.

(b) For the purposes of determining the amounts includible in the beneficiaries' gross income for 1955, the trust is deemed to have made the following distributions:

(c) A will include in his gross income for 1955 two-thirds of each item shown in paragraph (b) of this example. Thus, he will include in gross income $6,666.67 (10,000/ 15,000 × $10,000) of the 1955 distributable net income of the trust as provided in section 662(a)(2), and $3,333.33 (10,000/ 15,000 × $5,000) of the accumulation distribution and $733.33 (10,000/15,000 × $1,100) of the taxes imposed on the trust as provided in section 668(a).

(d) B will include in his gross income for 1955 one-third of each item shown in paragraph (b) of this example, computed in the manner shown in paragraph (c) of this example.