For example, assume that part of an accumulation distribution made in 1980 is deemed under section 666(a) to have been distributed to the beneficiary, A, in 1973; $10,000 of a prior accumulation distribution was deemed distributed in 1973. A was born on October 9, 1975. It will be assumed for purposes of § 1.668(b)-1A that A was alive in 1973, was on the calendar year basis, had no income other than (i) the $10,000 from the earlier accumulation distribution deemed distributed in 1973, and (ii) the part of the 1980 distribution deemed distributed in 1973, and had no deductions other than the personal exemption provided in section 151. It should be noted that the standard deduction for 1973 will be available to A with respect to the distribution only to the extent it qualifies as "earned income" in the hands of the trust. See section 141(e) and the regulations thereunder and § 1.652(b)-1 . If A were a trust or estate created after 1973, the same assumptions would apply, except that the trust or estate would not be entitled to the standard deduction and would receive the personal exemption provided under section 642(b) in the same manner as allowed under such section for A's first actual taxable year.
26 C.F.R. §1.668(b)-2A