California Code, Revenue and Taxation Code - RTC § 43152.13

(a) The fee imposed pursuant to Section 105190 of the Health and Safety Code, which is collected and administered under Section 43056, is due and payable on the last day of the second month following the end of the calendar year.

(b) Every employer subject to the fee imposed pursuant to Section 105190 of the Health and Safety Code shall in the form as prescribed by the board, which may include, but not be limited to, electronic media file an annual return and pay the proper amount of fee due.Returns shall be authenticated in a form or pursuant to methods as may be prescribed by the board.