California · Revenue and Taxation Code - RTC
RTC §43306: All amounts determined to be due by the board under Article 2 (commencing with Section 43201) are due and payable at the time they become final, and, if not paid when due and payable, a penalty of 10
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All amounts determined to be due by the board under Article 2 (commencing with Section 43201) are due and payable at the time they become final, and, if not paid when due and payable, a penalty of 10 percent of the amount determined to be due shall be added to the amount due and payable.
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