Every trust that is a split-interest trust, as described in § 4947(a)(2) of the Internal Revenue Code, unless its governing instrument expressly includes specific provisions to the contrary, shall not engage in any act of self-dealing, as defined in § 4941(d) of the Internal Revenue Code, retain any excess business holdings, as defined in § 4943(c) of the Internal Revenue Code, that would give rise to liability for the tax imposed by § 4943(a) of the Internal Revenue Code, make any investments in such manner as to give rise to liability for the tax imposed by § 4944 of the Internal Revenue Code, or make any taxable expenditures, as defined in § 4945(d) of the Internal Revenue Code. This section shall not apply with respect to:
1. Any amounts payable under the terms of such trust to income beneficiaries, unless a deduction was allowed under § 170(f)(2)(B), 2055(e)(2)(B), or 2522(c)(2)(B) of the Internal Revenue Code;
2. Any amounts in trust other than amounts for which a deduction was allowed under § 170, 545(b)(2), 556(b)(2), 642(c), 2055, 2106(a)(2), or 2522 of the Internal Revenue Code, if such other amounts are segregated from amounts for which no deduction was allowable; or