Cal. Rev. & Tax. Code § 60634

For the purposes of this part only, the board shall not revoke or suspend a person’s license pursuant to Section 60180 or 60181 unless the board has mailed a notice preliminary to revocation or suspension that indicates that the taxpayer will be suspended by a date certain pursuant to that section. The notice preliminary to suspension shall be mailed to the taxpayer at least 60 days before the date certain.