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Section 23058 Of Article 2. Definitions From California Revenue And Taxation Code >> Division 2. >> Part 11. >> Chapter 1. >> Article 2.

23058
. Unless otherwise specifically provided therein, the provisions of any act:
  (a) That affect the imposition or computation of tax, penalties, or the allowance of credits against the tax, shall be applied to taxable years beginning on or after January 1 of the year in which the act takes effect.
  (b) That otherwise affect the provisions of this part shall be applied on and after the date the act takes effect.