Allocating Receipts and Disbursements: General Principles
(a) In allocating receipts and disbursements to or between principal and income, and with respect to any other matter within the scope of this chapter, a fiduciary:
(1) Shall administer a trust or decedent's estate in accordance with the trust or the will, even if there is a different provision in this chapter.
(2) May administer a trust or decedent's estate by the exercise of a discretionary power of administration given to the fiduciary by the trust or the will, even if the exercise of the power produces a result different from a result required or permitted by this chapter, and no inference that the fiduciary has improperly exercised the discretion arises from the fact that the fiduciary has made an allocation contrary to a provision of this chapter.
(3) Shall administer a trust or decedent's estate in accordance with this chapter if the trust or the will does not contain a different provision or does not give the fiduciary a discretionary power of administration.
(4) Shall add a receipt or charge a disbursement to principal to the extent that the trust or the will and this chapter do not provide a rule for allocating the receipt or disbursement to or between principal and income.
(b) In exercising a discretionary power of administration regarding a matter within the scope of this chapter, whether granted by a trust, a will, or this chapter, including the trustee's power to adjust under subdivision (a) of Section 16336, and the trustee's power to convert into a unitrust or reconvert or change the unitrust payout percentage pursuant to Sections 16336.4 to 16336.6, inclusive, the fiduciary shall administer the trust or decedent's estate impartially, except to the extent that the trust or the will expresses an intention that the fiduciary shall or may favor one or more of the beneficiaries. The exercise of discretion in accordance with this chapter is presumed to be fair and reasonable to all beneficiaries.