If a trustee determines that an allocation between principal and income required by G.S. 37A-4-409, 37A-4-410, 37A-4-411, 37A-4-412, or 37A-4-415 is insubstantial, the trustee may allocate the entire amount to principal unless one of the circumstances described in G.S. 37A-1-104(c) applies to the allocation. This power may be exercised by a cotrustee in the circumstances described in G.S. 37A-1-104(d) and may be released for the reasons and in the manner described in G.S. 37A-1-104(e). An allocation is presumed to be insubstantial if:
N.C. Gen. Stat. § 37A-4-408