California Code, Revenue and Taxation Code - RTC § 4703

(a) The tax losses reserve fund shall be used exclusively, as hereinafter provided, to cover losses that may occur in the amount of tax liens as a result of special sales of tax-defaulted property. Whenever in any year the amount of the tax losses reserve fund has reached an amount equivalent to 1 percent of the total of all taxes and assessments levied on the secured roll for that year for participating entities in the county, the amounts hereinafter authorized to be credited to that fund may, for the remainder of that year, be credited to the county general fund.

(b) The auditor and treasurer shall keep apportioned tax resources accounts in a manner that the balance of amounts apportioned to funds on an accrual basis shall be known by both officers. In addition, the auditor shall keep secured taxes receivable accounts in a manner as to establish accountability for the amounts receivable on the secured tax rolls. Secured tax rolls, as used in this chapter, include delinquent rolls prescribed by Section 2627.