26 CFR §1.668(a)-3 — (a)-3 Excluded amounts.

When a trust pays, credits, or is required to distribute to a beneficiary amounts which are excluded under section 665(b) (1), (2), (3), or (4) from the computation of an accumulation distribution, the amount includible under subpart D (section 665 and following), part I, subchapter J, chapter 1 of the Code, in the gross income of the beneficiaries pursuant to § 1.668(a)-1 is first allocated to the beneficiaries as provided in § 1.668(a)-2 and, second, the amount allocable to the beneficiary receiving amounts which are excluded under section 665(b) (1), (2), (3), or (4) is reduced by the excluded amounts. This section may be illustrated by the following examples, in which it is assumed the trusts and beneficiaries report on the calendar year basis and the income of the trusts was derived entirely from taxable interest: