Cal. Unemployment Insurance Code § 1114

(a) Any employer who, without good cause, fails to file within 15 days after service by the director of notice pursuant to Section 1206 of a specific written demand therefor, a report of wages of each of his or her workers required by this division, shall pay in addition to other amounts required, for each unreported wage item a penalty of twenty dollars ($20). (b) Any employer required by this division to file a report of wages of each of his or her workers on magnetic media or other electronic means as prescribed by subdivision (e) or (h) of Section 1088, who, without good cause, instead files a report of wages by means other than electronic, shall pay, in addition to other amounts required, for each wage item a penalty of twenty dollars ($20). (c) Notwithstanding subdivision (b), on and after January 1, 2017, and before January 1, 2019, an employer required to file a report of wages, excluding employers previously required to file a report of wages under subdivision (e) of Section 1088, who files a report of wages within the time required by means that are not electronic shall not be subject to the penalty described in subdivision (b). (d) The changes made to this section by Chapter 28 of the Statutes of 2014 shall apply on and after July 1, 2014.