Cal. Rev. & Tax. Code § 17276.1

(a) A qualified taxpayer, as defined in Section 17276.2, 17276.4, 17276.5, 17276.6, or 17276.7, may elect to take the deduction provided by Section 172 of the Internal Revenue Code, relating to the net operating loss deduction, as modified by Section 17276, with the following exceptions:
1. (1) Subdivision (a) of Section 17276, relating to years in which allowable losses are sustained, shall not be applicable.
2. (2) Subdivision (b) of Section 17276, relating to the 50-percent reduction of losses, shall not be applicable.
(b) The election to compute the net operating loss under this section shall be made in a statement attached to the original return, timely filed for the year in which the net operating loss is incurred and shall be irrevocable. In addition to the exceptions specified in subdivision (a), the provisions of Section 17276.2, 17276.4, 17276.5, 17276.6, or 17276.7, as appropriate, shall be applicable.
(c) Any carryover of a net operating loss sustained by a qualified taxpayer, as defined in subdivision (a) or (b) of Section 17276.2 as that section read immediately prior to January 1, 1997, shall, if previously elected, continue to be a deduction, as provided in subdivision (a), applied as if the provisions of subdivision (a) or (b) of Section 17276.2, as that section read prior to January 1, 1997, still applied.