California Sales Tax for Online Purchases
Internet Sales Tax
There is no general tax exemption for sales of tangible personal property (merchandise) made over the Internet (Internet sales).
Some states have introduced Internet sales tax laws.
Shopify calculates, collects and remits sales tax on behalf of states (if applicable).
For more details about Internet Sales Tax Laws see
https://www.cdtfa.ca.gov/formspubs/pub109/