If a trustee determines that an allocation between principal and income required by § 55-13A-409, 55-13A-410, 55-13A-411, 55-13A-412, or 55-13A-415 is insubstantial, the trustee may allocate the entire amount to principal unless one of the circumstances described in § 55-13A-104(c) applies to the allocation. This power may be exercised by a cotrustee in the circumstances described in § 55-13A-104(d) and may be released for the reasons and in the manner described in § 55-13A-104(e). An allocation is presumed to be insubstantial if:
SDCL 55-13A-408