Revenue and Taxation Code section 19547
(a)
The taxpayer is or may be a party to the proceeding, or the proceeding arose out of, or in connection with, determining the taxpayer’s civil or criminal liability, or the collection of the taxpayer’s civil liability with respect to any tax imposed under Part 10 (commencing with Section 17001) or Part 11 (commencing with Section 23001).(b)
The treatment of an item reflected on the return is or may be related to the resolution of an issue in the proceeding or investigation.(c)
The return or return information relates or may relate to a transactional relationship between a person who is a party to the proceeding and the taxpayer, which affects or may affect, the resolution of an issue in the proceeding or investigation.
Source:
Section 19547, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC§ionNum=19547.
(accessed Apr. 24, 2025).