If a trustee determines that an allocation between principal and income required by 11-A-4.9, 11-A-4.10, 11-A-4.11, 11-A-4.12, or 11-A-4.15 is insubstantial, the trustee may allocate the entire amount to principal unless one of the circumstances described in subparagraph 11-2.3 (b)(5) applies to the allocation. This power may be exercised by a cotrustee in the circumstances described in subparagraph 11-2.3 (b)(5) and may be released for the reasons and in the manner described in that section. An allocation is presumed to be insubstantial if:
N.Y. EPTL 11-A-4.8