26 C.F.R. § 1.642(a)(3)-2
In general, dividends are deemed received by a beneficiary in the taxable year in which they are includible in his gross income under section 652 or 662. For example, a simple trust, reporting on the basis of a fiscal year ending October 30, receives quarterly dividends on November 3, 1954, and February 3, May 3, and August 3, 1955. These dividends are all allocable to beneficiary A, reporting on a calendar year basis, under section 652 and are deemed received by A in 1955. See section 652(c). Accordingly, A may take all these dividends into account in determining his credit for dividends received under section 34 and his dividends exclusion under section 116. However, solely for purposes of determining whether dividends deemed received by individuals from trusts or estates qualify under the time limitations of section 34(a) or section 116(a), section 642(a)(3) provides that the time of receipt of the dividends by the trust or estate is also considered the time of receipt by the beneficiary. For example, a simple trust reporting on the basis of a fiscal year ending October 30 receives quarterly dividends on December 3, 1953, and March 3, June 3, and September 3, 1954. These dividends are all allocable to beneficiary A, reporting on the calendar year basis, under section 652 and are includible in his income for 1954. However, for purposes of section 34(a) or section 116(a), these dividends are deemed received by A on the same dates that the trust received them. Accordingly, A may take into account in determining the credit under section 34 only those dividends received by the trust on September 3, 1954, since the dividend received credit is not allowed under section 34 for dividends received before August 1, 1954 (or after December 31, 1964). Section 642(a)(3) and this section do not apply to amounts received by an estate or trust as dividends after December 31, 1964. However, the rules in this section relating to time of receipt of dividends by a beneficiary are applicable to dividends received by an estate or trust prior to January 1, 1965, and accordingly, such dividends are deemed to be received by the beneficiary (even though received after December 31, 1964) on the same dates that the estate or trust received them for purposes of determining the credit under section 34 or the exclusion under section 116.
26 C.F.R. §1.642(a)(3)-2