California Code, Revenue and Taxation Code - RTC § 18606

(a) In cases where receivers, trustees in a case under Title 11 of the United States Code, or assignees are operating the property or business of a corporation those receivers, trustees, or assignees shall make returns for that corporation in the same manner and form as that corporation is required to make a return.

(b) Any tax due on the basis of returns made by receivers, trustees, or assignees shall be collected in the same manner as if collected from the corporation of whose business or property they have custody and control.