Upon approval of the Director of Finance, any state agency with respect to any amount required to be shown on any form prescribed by the agency, or any amount of credit or refund, or any amount to be collected as a deficiency or underpayment of any tax, penalty, interest, license or other fee, or any other payment, may provide by regulation for the disregard of the fractional part of a dollar, unless it amounts to fifty cents ($0.50) or more, in which case it shall be increased to one dollar ($1).
Source:
Section 16302.2, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=16302.2..