Cal. Lab. Code § 3702.9

(a) In addition to remedies and penalties otherwise provided for a failure to secure the payment of compensation, the director may, after a determination that an obligation created in this article has been violated, also enter an order against any self-insured employer, including employers who are no longer self-insured, but who are required to comply with Section 3702.8, directing compliance, restitution for any losses, and a civil penalty in an amount not to exceed the following:
1. (1) For a failure to file a complete or timely annual report, an amount up to 5 percent of the incurred liabilities in the last report or one thousand five hundred dollars ($1,500), whichever is less, for each 30 days or portion thereof during which there is a failure.
2. (2) For failure to deposit and maintain a security deposit, an amount up to 10 percent of the increase not timely filed or five thousand dollars ($5,000), whichever is less, for each 30 days or portion thereof during which there is a failure.
3. (3) For a failure to timely or completely pay an assessment, an amount up to the assessment or two thousand five hundred dollars ($2,500), whichever is less, for each 30 days or portion thereof during which there is a failure.
4. (4) Where the failure was by an employer which knew or reasonably should have known of the obligation, the director shall, in addition, award reimbursement for all expenditures and costs by the fund or any intervening party, including a reasonable attorney fee.
5. (5) Where the failure was malicious, fraudulent, in bad faith, or a repeated violation, the director may award, as an additional civil penalty, liquidated damages of up to double the amounts assessed under paragraphs (1) to (4), inclusive, for deposit in the General Fund.
(b) An employer may deposit and maintain a security deposit or pay an assessment, reserving its right to challenge the amount or liability therefor at a hearing. If the director or the appeals board or a court, upon appeal, concludes that the employer is not liable or the amounts are excessive, then the director may waive, release, compromise, refund, or otherwise remit amounts which had been paid or deposited by an employer. The director may condition the waiver, release, compromise, refund, or remittance upon the present and continued future compliance with the obligations of subdivision (a) of Section 3702.8 for a period up to two years.
(c) Notwithstanding subdivision (b), where a violation has occurred, the director may waive, release, compromise, or otherwise reduce any civil penalty otherwise due upon a showing that a violation occurred through the employer’s mistake, inadvertence, surprise, or excusable neglect. Neglect is not excusable within the meaning of this subdivision where the employer knew, or reasonably should have known, of the obligations.