California Code, Revenue and Taxation Code - RTC § 7659.7

(a) If the failure to make a prepayment as described in Section 7659.6 is due to negligence or intentional disregard of this part or authorized rules and regulations, the penalty shall be 10 percent, instead of 6 percent.

(b) If any part of a deficiency in prepayment is due to negligence or intentional disregard of this part or authorized rules and regulations, a penalty of 10 percent of the deficiency shall be paid.

(c) The provisions of this section shall not apply to amounts subject to the provisions of Sections 7655, 7660, 7662, 7672, 7673, and 7726.

(d) The 10-percent negligence penalty shall become due and payable and shall be ascertained and determined in the same manner as the deficiency determination under Article 4 (commencing with Section 7670) of this chapter. The provisions of Article 6 (commencing with Section 7710) of this chapter shall be applicable with respect to the finality of the determination and the right of the supplier to petition for redetermination.