Revenue and Taxation Code section 41095
(a)
Any person who fails to pay any surcharge to the state or any amount of surcharge required to be collected and paid to the state, except amounts of determinations made by the department under Article 3 (commencing with Section 41070) or Article 4 (commencing with Section 41080), within the time required shall pay a penalty of 10 percent of the surcharge in addition to the surcharge or amount of surcharge, plus interest at the modified adjusted rate per month, or fraction thereof, established pursuant to Section 6591.5, from the date on which the surcharge or the amount of surcharge required to be collected became due and payable to the state until the date of payment.(b)
Any person who fails to file a return in accordance with the due date set forth in Section 41052 or the due date established by the department in accordance with Section 41052.1, shall pay a penalty of 10 percent of the amount of the surcharge with respect to the period for which the return is required.(c)
The penalties imposed by this section shall be limited to a maximum of 10 percent of the surcharge for which the return is required for any one return.
Source:
Section 41095, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC§ionNum=41095. (accessed May 12, 2025).