Cal. Unemployment Insurance Code § 1329.5

For purposes of a claim for unemployment benefits under subdivision (b) of Section 1275, all of the following apply: (a) Computation using the last four completed calendar quarters shall be based on available wage information processed as of the close of business on the day preceding the date of application. (b) If the wage information is not already in the department’s system, the department shall request the information from the employer, and the employer shall, within 10 days after the mailing of the request from the department, transmit to the department information on the employee’s wages and any other information relevant to the request. The 10-day period may be extended for good cause. (c) If the wage, and other relevant information, requested pursuant to subdivision (b) are not received by the department, the department shall accept an affidavit of wages and other relevant information from the claimant in accordance with authorized regulations. These regulations shall be adopted as emergency regulations. (d) A determination of benefits made pursuant to subdivision (b) of Section 1275 shall be adjusted when the quarterly wage report from the employer is received if that information causes a change in the determination. (e) Except in the event of fraud, if it is determined that any information provided by the claimant on an affidavit is erroneous, no penalty or refund of benefits shall be imposed on the claimant for the period prior to the calendar week in which an employer provides subsequent wage information.