26 CFR 1.643(a)-7: (a)-7 Dividends.

Dividends excluded from gross income under section 116 (relating to partial exclusion of dividends received) are included in distributable net income. For this purpose, adjustments similar to those required by § 1.643(a)-5 with respect to expenses allocable to tax-exempt income and to income included in amounts paid or set aside for charitable purposes are not made. See the regulations under section 642(c).