Cal. Unemp. Ins. Code § 993

Every employer who is subject to the tax provided for by Section 3301 of the Federal Unemployment Tax Act, shall, subject to Section 992, pay into the Unemployment Fund in addition to the amounts required by other provisions of this division an amount equal to five-tenths of 1 percent, or such other percentage as applies for a calendar year pursuant to Section 6157 of the Internal Revenue Code of 1954, of all wages paid by him or her in employment and included in the measure of the contributions allowed as the credit against the tax imposed by Section 3301 of the Federal Unemployment Tax Act.