Cal. Rev. & Tax. Code § 19063
(a) In the case of any tax imposed by Part 10 (commencing with Section 17001) or Part 11 (commencing with Section 23001) with respect to any person, the period for assessing a deficiency attributable to any partnership item of a federally registered partnership shall not expire before the later of the following:
(b) For purposes of this section, “partnership item” means both of the following:
(c) The extensions referred to in subsection (c)(4) of Section 6501 of the Internal Revenue Code, insofar as they relate to partnership items, may, with respect to any person, be consented by either of the following:
(d) For purposes of this section, “federally registered partnership” means, with respect to any partnership taxable year, any partnership for which either of the following apply: