Cal. Probate Code § 16360

Subject to Section 16363, and except as otherwise provided in paragraph (2) or (3) of subdivision (c) of Section 16370, a fiduciary shall disburse from income all of the following: (a) One-half of both of the following: (1) The regular compensation of the fiduciary and any person providing investment advisory, custodial, or other services to the fiduciary, to the extent income is sufficient. (2) An expense for an accounting, judicial, or nonjudicial proceeding, or other matter that involves both income and successive interests, to the extent income is sufficient. (b) The balance of the disbursements described in paragraph (1) of subdivision (a), to the extent a fiduciary that is an independent person determines that making those disbursements from income would be in the interests of the beneficiaries. (c) Another ordinary expense incurred in connection with administration, management, or preservation of property and distribution of income, including interest, an ordinary repair, regularly recurring tax assessed against principal, and an expense of an accounting, judicial or nonjudicial proceeding, or other matter that involves primarily an income interest, to the extent income is sufficient. (d) A premium on insurance covering loss of a principal asset or income from or use of the asset.