Zno only collects CA sales tax on orders shipped to California, United States.
If you have a valid CA Seller's Permit, you may get a refund for the CA sales tax paid and be exempt from future CA sales tax by completing and signing a CA Resale Certificate. Please download the form by clicking the link below. Then complete it, sign it, and email it to support@zno.com. Please allow 1-2 days for verification before your account is marked exempt from CA sales tax.
https://www.cdtfa.ca.gov/formspubs/cdtfa230.pdf
If you have a Seller's Permit outside of California, and shipping to a client in California - you are not eligible for the CA sales tax refund and cannot be exempt.