Cal. Rev. & Tax. Code § 23333

(a)A taxpayer subject to Section 23186 shall, if it dissolves or withdraws prior to the date the rate is determined under Section 23186, pay a tax under Section 23332 at the maximum rate prescribed by Section 23186. If the rate is subsequently determined to be less than the maximum prescribed by Section 23186, a refund shall, within 30 days of that determination, be made as prescribed by Chapter 6 (commencing with Section 19301) of Part 10.2.

(b)That part of the tax thus determined which is in excess of the rate specified in Section 23151 shall be collected as a demand for second installment under Chapter 4 (commencing with Section 19001) of Part 10.2.