California Code, Revenue and Taxation Code - RTC § 61023

(a) The length of a continuous period shall be determined without regard to the calendar years in which months in that period occur.

(b) If a continuous period is greater than the period allowed under this subdivision, an exception shall not be provided under this subdivision for any month in the period.

(c) If there is more than one continuous period described in this subdivision covering months in a calendar year, the exception provided by this subdivision shall only apply to months in the first of those periods.

(d) The Franchise Tax Board may prescribe rules for the collection of the penalty imposed by this section in cases where continuous periods include months in more than one taxable year.