Example. The terms of a trust require the distribution annually of $10,000 of income to A. If any income remains, it may be accumulated or distributed to B, C, and D in amounts in the trustee's discretion. He may also invade corpus for the benefit of A, B, C, or D. In the taxable year, the trust has $20,000 of income after the deduction of all expenses. Distributable net income is $20,000. The trustee distributes $10,000 of income to A. Of the remaining $10,000 of income, he distributes $3,000 each to B, C, and D, and also distributes an additional $5,000 to A. A includes $10,000 in income under section 662(a)(1). The "other amounts distributed" amount of $14,000, includible in the income of the recipients to the extent of $10,000, distributable net income less the income currently distributable to A. A will include an additional $3,571 (5,000/14,000 * $10,000) in income under this section, and B, C, and D will each include $2,143 (3,000/14,000 * $10,000).
26 C.F.R. §1.662(a)-3