Cal. Rev. & Tax. Code § 19141.2
(b) Section 6038(a) is modified as follows:
(c)
(1) Unless it is shown that the failure is due to reasonable cause and not due to willful neglect, a penalty shall be imposed under this part for failure to furnish information and that penalty shall be determined in accordance with Section 6038 of the Internal Revenue Code, except as otherwise provided.
(2) No penalty shall be imposed under paragraph (1) if the copy of the information required to be filed with the Internal Revenue Service was not attached to the taxpayer’s return as originally filed but the taxpayer does both of the following: