If a trustee determines that an allocation between principal and income required by Section 62-7-918, 62-7-919, 62-7-920, 62-7-921, or 62-7-924 is insubstantial, the trustee may allocate the entire amount to principal unless one of the circumstances provided in Section 62-7-904(C) applies to the allocation. This power may be exercised by a cotrustee in the circumstances provided in Section 62-7-904(D) and may be released for the reasons and in the manner provided in Section 62-7-904(E). An allocation is presumed to be insubstantial if:
S.C. Code § 62-7-917