California Code, Unemployment Insurance Code - UIC § 1126.1

(a) If any employing unit fails to register with the department as required under Section 1086, and the failure is due to intentional disregard or intent to evade this division or authorized regulations, a penalty of one hundred dollars ($100) per nonreported employee shall be added to an assessment issued in accordance with Section 1126.

(b) For purposes of this section, the number of nonreported employees shall be defined as the highest number of employees determined by the department to have been engaged by the employer during any single calendar quarter included in the assessment under Section 1126.