If any overpayment of taxes imposed by this part is refunded or credited within 90 days after the due date of the tax for the year for which the overpayment was made, no interest shall be allowed on that overpayment.
Source:
Section 12983.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC§ionNum=12983.5..