Cal. Unemp. Ins. Code § 987.7

(a) If the worker contributions required in any one month to be made because of the receipt of cash tips and cash gratuities exceed the wages of the worker under the control of the employer, the worker may furnish the employer, on or before the 10th day of the following month, or, if the amounts are estimated, on or before the last day of the month following the calendar quarter, an amount equal to the excess.
(b) If the worker contributions required by Section 984 with respect to cash tips and cash gratuities exceed the amount of worker contributions that can be collected by the employer from the wages of the worker, the excess shall be paid by the worker, except as provided by Section 1088.6. The worker shall pay the excess to the department within 30 days from his or her receipt of the written statement furnished by his or her employer pursuant to Section 1088.6. If the worker fails to pay the excess within the time required by this subdivision, the director may make an assessment for the excess and shall give the worker a written notice of the assessment. Article 8 (commencing with Section 1126) with respect to the assessment of contributions and Chapter 7 (commencing with Section 1701) with respect to the collection of contributions shall apply to the recovery of amounts under this subdivision.
(c) The director may offset amounts assessed pursuant to subdivision (b) against any refund payable to the worker under Section 1176.5 or against any amount of disability benefits to which he or she may become entitled under Part 2 (commencing with Section 2601) within any of the following periods:
1. (1) The current disability benefit period.
2. (2) One year from the beginning date of any disability benefit period that begins during the three-year period next succeeding the service of notice of the assessment.