California Code, Insurance Code - INS § 11694

After the first annual statement to the commissioner covering business of the insurer for a full year in this state, the deposit required pursuant to Section 11691 shall be computed from the figures shown in the last preceding report of business as of December 31, filed with the commissioner, and shall be reported to the commissioner on or before March 1 of each year in a form and manner prescribed by the commissioner.  Notwithstanding anything to the contrary in this article, should the commissioner determine that there has been a material change in the insurer's ultimate liability for future payments upon compensable workers' compensation claims in this state, at the commissioner's discretion, the amount of the deposit shall then be fixed by the commissioner at the amount that he or she deems sufficient to secure the payment of the insurer's ultimate obligations on its workers' compensation insurance transacted in this state, and upon notification from the commissioner the insurer shall immediately, but in no event less than 30 days after notification, increase the deposit as directed.