Let google be your guide? https://www.google.com/search?q=De+minimis+safe+harbor+rule+for+small+tax+payer+for+California
Here is the appropriate conformity guide for 2018 https://www.ftb.ca.gov/forms/2018/18_1001.pdf You need to order the 2019 online at FTB
Here's wishing you many Happy Returns
