California Code, Probate Code - PROB § 2461

(a) The guardian or conservator may prepare, execute, and file tax returns for the ward or conservatee and for the estate and may exercise options and elections and claim exemptions for the ward or conservatee and for the estate under the applicable tax laws.

(b) Notwithstanding Section 2502, the guardian or conservator may pay, contest, and compromise taxes, penalties, and assessments upon the property of the estate and income and other taxes payable or claimed to be payable by the ward or conservatee or the estate.