California Code, Revenue and Taxation Code - RTC § 61010

(a) A penalty in the amount determined under Section 61015 shall be imposed on a responsible individual for a failure by the responsible individual, the applicable spouse, or an applicable dependent to enroll in and maintain minimum essential coverage pursuant to Section 100705 of the Government Code for one or more months, except as provided in Section 61020 and 61023. This penalty shall be referred to as the Individual Shared Responsibility Penalty.

(b) A penalty imposed by this section with respect to any month shall be included with a responsible individual's return under Chapter 2 (commencing with Section 18501) of Part 10.2 for the taxable year that includes that month.

(c) If an individual with respect to whom a penalty is imposed by this section for any month is a dependent of another individual for the other individual's taxable year, including that month, the other individual shall be solely liable for that penalty.

(d) If a responsible individual with respect to whom a penalty is imposed pursuant to this section for any month files a joint return for the taxable year, including that month, that responsible individual and the spouse or domestic partner of the individual shall be jointly and severally liable for the penalty imposed.