California Code, Code of Civil Procedure - CCP § 1577

(a) In addition to any damages, penalties, or fines for which a person may be liable under other provisions of law, any person who fails to report, pay, or deliver unclaimed property within the time prescribed by this chapter, unless that failure is due to reasonable cause, shall pay to the Controller interest at the rate of 12 percent per annum on that property or value thereof from the date the property should have been reported, paid, or delivered.

(b) If a holder reports and pays or delivers unclaimed property within the time prescribed by this chapter, but files a report that is not in substantial compliance with the requirements of Section 1530or 1532, the interest payable on the unclaimed property that is paid or delivered in the time prescribed by this chapter shall not exceed ten thousand dollars ($10,000).

(c) The Controller may waive the interest payable under this section if the holder's failure to file a report that is in substantial compliance with the requirements of Section 1530or 1532 is due to reasonable cause.

(d) The Controller shall waive the interest payable under this section if the holder participates in and completes all of the requirements of the California Voluntary Compliance Program under Section 1577.5, subject to the right to reinstate, as specified.