California Code, Revenue and Taxation Code - RTC § 19135

(a)(1) The Franchise Tax Board shall impose a penalty of two thousand dollars ($2,000) per taxable year whenever an entity described in paragraph (2) is doing business in this state, within the meaning of Section 23101, and fails to make and file a return as required by this part, within 60 days after the Franchise Tax Board sends the taxpayer a notice and demand to file the required tax return, unless the failure is due to reasonable cause and not willful neglect.