Cal. Rev. & Tax. Code § 32221
Except with respect to beer and wine in the internal revenue bonded premises of a manufacturer, and except with respect to distilled spirits in the possession of a distilled spirits manufacturer, distilled spirits manufacturer's agent, brandy manufacturer, rectifier, wholesaler, or common carrier licensed to sell distilled spirits on board boats, trains, and airplanes, floor stock taxes are hereby imposed in amounts equal to the surtaxes imposed by Section 32220 upon all alcoholic beverages upon which the surtaxes have not been paid, that are in the possession or under the control of every person licensed under Division 9 (commencing with Section 23000) of the Business and Professions Code at 2:01 a.m. on July 15, 1991. On or before August 31, 1991, each person subject to the tax imposed by this section shall prepare and file with the State Board of Equalization, on a form prescribed by the board, a return showing the amount of units of beer, wine, sparkling hard cider, and distilled spirits possessed by him or her at 2:01 a.m. on July 15, 1991, that are subject to the tax imposed by this section, and any other information the board deems necessary for the proper administration of this chapter. The taxpayer shall deliver the return, together with a remittance of the amount of tax due, to the office of the board on or before August 31, 1991.
Ca. Rev. and Tax. Code § 32221