California Code, Unemployment Insurance Code - UIC § 2656

(a) An individual eligible to receive disability benefits who receives wages or regular wages from his or her employer during the period of his or her disability or period of family care leave shall be paid disability benefits for any seven-day week or partial week in an amount not to exceed his or her maximum weekly amount which together with the wages or regular wages does not exceed his or her weekly wage, exclusive of wages paid for overtime work, immediately prior to the commencement of his or her disability or period of family care leave.

(b) For purposes of this section, to determine the wages or regular wages received by the eligible individual, the amount as stated by the individual shall be presumed to be accurate. This presumption is one affecting the burden of producing evidence.

(c) Except as provided in subdivision (g) of Section 3303, for purposes of periods of disability commencing on or after January 1, 1992, vacation pay is not considered wages for determining eligibility for disability benefits.