California sales tax permit / seller's permit.
If your business sells taxable goods or services in California, you need a sales tax permit (also called a seller's permit). This guide explains nexus rules, post-Wayfair economic thresholds, the application process, and ongoing filing frequency.
Register for California sales tax →When you need a California sales tax permit
California requires sales tax registration once your business has nexus in the state. Nexus can be: