Cal. Rev. & Tax. Code § 19147
(a) Notwithstanding Sections 19142 to 19145, inclusive, the addition to the tax with respect to any underpayment of any installment shall not be imposed if the total amount of all payments of estimated tax paid on or before the last date prescribed for the payment of the installment equals or exceeds the amount which would have been required to be paid on or before that date if the estimated tax were whichever of the following is the lesser:
(1)
(B) In the case of a large corporation, subparagraph (A) shall not apply, except as provided in clauses (i) and (ii).
(2)
(A) An amount equal to the applicable percentage specified in Section 19144 of the tax for the taxable year computed by placing on an annualized basis the taxable income:
(B)
(i) If the taxpayer makes an election under this clause, each of the following shall apply:
(ii) If the taxpayer makes an election under this clause, each of the following shall apply:
(C) For purposes of this paragraph, the taxable income shall be placed on an annualized basis in the following manner:
(ii) Divide the resulting amount by the number of months in the taxable year referred to in subparagraph (A).
“Taxable income” as used in this paragraph means “net income” includable in the measure of tax or “alternative minimum taxable income” (as defined by Section 23455).
(D) In the case of any corporation which is subject to the tax imposed under Section 23731, any reference to taxable income shall be treated as including a reference to unrelated business taxable income and, except in the case of an election under subparagraph (B), each of the following shall apply:
(b)
(c)