California Code, Revenue and Taxation Code - RTC § 7074

(1) For amounts that are due and payable on the last date of the amnesty period, an amount equal to 50 percent of the accrued interest payable under Section 6591 for the period beginning on the date in which the tax was due and ending on the last day of the amnesty period specified in Section 7071.

(2) An amount equal to 50 percent of the interest computed under Section 6591 on any final amount, including final deficiencies and self-assessed amounts, for the period beginning on the date in which the tax was due and ending on the last day of the amnesty period specified in Section 7071.