Cal. Rev. & Tax. Code § 7670

If the board is not satisfied with the return made by any supplier, it may make a deficiency determination of the tax required to be paid by the supplier based upon information contained in the return or upon any information in the possession of the board. The board may make a determination for more than one period and may make one or more determinations for the same period. When a business is discontinued a determination may be made at any time thereafter, within the period specified in Section 7675, as to liability arising out of that business, irrespective of whether the determination is issued prior to the due date of the liability as otherwise specified in this part.