For purposes of determining the number of installments paid or credited to a particular beneficiary, a decedent's estate and a testamentary trust shall each be treated as a separate entity.
Example (1).
Example (2). Assume the same facts as in example (1), except that another distribution of a specified sum of money is required to be made by the trust to A when he becomes 40 years old. This distribution would also qualify as an installment, thus making four installments in all under the trust. None of the gifts to A under the trust would qualify for the exclusion under section 663(a)(1). The situation as to the estate, however, would not be changed.
Example (3). A trust instrument provides that A and B are each to receive $75,000 in installments of $25,000, to be paid in alternate years. The trustee distributes $25,000 to A in 1954, 1956, and 1958, and to B in 1955, 1957, and 1959. The gifts to A and B qualify for exclusion under section 663(a)(1), although a total of six payments is made. The gifts of $75,000 to each beneficiary are to be separately treated.
26 C.F.R. §1.663(a)-1