Cal. Rev. & Tax. Code § 19082

In the case of a tax for a current period, if the Franchise Tax Board finds that the assessment or collection of the tax will be jeopardized in whole or in part by delay, the Franchise Tax Board may declare the taxable period of the taxpayer immediately terminated. The Franchise Tax Board shall mail or issue notice of its finding and declaration to the taxpayer, together with a demand for a return and immediate payment of the tax based on the period declared terminated, including therein income accrued and deductions incurred up to the date of termination if not otherwise properly includible or deductible in respect of the period, and the tax shall be immediately due and payable whether or not the time otherwise allowed by law for filing the return and paying the tax has expired.