Cal. Rev. & Tax. Code § 43350

If the California Department of Tax and Fee Administration believes that the collection of any amount of tax will be jeopardized by delay, it shall thereupon make a determination of the amount of tax due, noting that fact upon the determination, and the amount of tax shall be immediately due and payable. If the amount of the tax, interest, and penalty specified in the jeopardy determination is not paid, or a petition for redetermination is not filed, within 10 days after the service upon the taxpayer of notice of the determination, the determination becomes final, and the delinquency penalty and interest provided in Section 43155 or 43155.01 shall attach to the amount of tax specified therein.