California sale tax is 8.25%
Sales tax has not been deductible for quite a few years.
However, if you make a purchase that is deductible and you pay sales tax on
the purchase, then the sales tax may be included in the purchase price.
For example, if you're eligible to itemize medical deductions, and you
buy something expensive (like a hearing aid) and the state taxes the
purchase (some do, some don't), then you may deduct the purchase price plus
the sales tax.
Gary