Cal. Revenue and Taxation Code § 45156

(a) If the department finds that a person’s failure to make a timely return or payment was due to disaster, and occurred notwithstanding the exercise of ordinary care and the absence of willful neglect, the person may be relieved of interest provided for by Sections 45152, 45153, 45160, and 45201. (b) Except as provided in subdivision (c), a person seeking to be relieved of interest shall file with the department a statement under penalty of perjury setting forth the facts upon which the person bases the claim for relief. (c) (1) Subject to paragraph (2), the department may grant relief of the interest for any person in an area identified in a state of emergency proclamation made by the Governor for the period the state of emergency proclamation is effective, regardless of whether the person has filed a statement with the department pursuant to subdivision (b). (2) The department may grant the relief in paragraph (1) only during the first 12 months following the issuance of the state of emergency proclamation or the duration of the state of emergency, whichever is less.