Section 1.668(a)-3A - Determination of taxIn a taxable year in which an amount is included in a beneficiary's income under § 1.668(a)-1A(a) , the tax on the beneficiary for such taxable year is determined only as provided in section 668 and consists of the sum of:
(a) A partial tax computed on (1) the beneficiary's taxable income reduced by(2) an amount equal to the total amounts includible in his income under § 1.668(a)-1A(a) , at the rate and in the manner as if section 668 had not been enacted,(b) A partial tax determined as provided in § 1.668(b)-1A , and(c) In the case of a beneficiary of a trust which is not required to distribute all of its income currently, a partial tax determined as provided in § 1.669(b)-1A .T.D. 7204, 37 FR 17148, Aug. 25, 1972