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Part I of this article first provides a general overview of §§ 1411 and 663(c) and the interaction between them and the respective regulations thereunder and then proposes a revised regulation to clarify the relationship between and among the two sections and their regulations. Part II discusses the possibility of certain cross-deductions under § 1411, in conjunction with §§ 661, 662, and 663(c). Finally, Part III presents and discusses a proposed calculation and allocation, to the separate shares of a trust or estate, of income and deduction items entering into the computation of NII and DNI of the trust or estate.