Cal. Rev. & Tax. Code § 23253

Section 381(b) of the Internal Revenue Code, relating to operating rules, shall apply in determining the close of the taxable year. If a short period year is required by use of Section 381(b) of the Internal Revenue Code, the transferor’s short year tax shall be computed using the provisions of Section 23151.1 for general corporations or Section 23181 for banks and financial corporations.