Idaho Code § 33-5004
(1) Subject to the intent of a donor expressed in the gift instrument, an institution may appropriate for expenditure or accumulate so much of an endowment fund as the institution determines is prudent for the uses, benefits, purposes and duration for which the endowment fund is established. Unless stated otherwise in the gift instrument, the assets in an endowment fund are donor restricted assets until appropriated for expenditure by the institution. In making a determination to appropriate or accumulate, the institution shall act in good faith, with the care that an ordinarily prudent person in a like position would exercise under similar circumstances, and shall consider, if relevant, the following factors:
(3) Terms in a gift instrument designating a gift as an endowment, or any general or specific direction or authorization in the gift instrument to use only "income," "interest," "dividends" or "rents, issues or profits," or "to preserve the principal intact," or words of similar import, or any direction in such gift instrument relating to measuring permitted distributions to permitted payees by reference to certain types or classes of investment returns, or allocation in such gift instrument of certain types or classes of returns to income or principal:
[33-5004, added 2007, ch. 173, sec. 2, p. 514; am. 2012, ch. 146, sec. 1, p. 416.]