Compute taxable income. Once the filer know which tax form to use, the taxable income must be computed using the form and then entered into the online tax calculator, along with filing status, to calculate California state income tax.What is the tax rate in ca?
The California state sales tax rate is 7.5%, and the average CA sales tax after local surtaxes is 8.44%. Groceries and prescription drugs are exempt from the California sales tax. Counties and cities can charge an additional local sales tax of up to 2.5%, for a maximum possible combined sales tax of 10%.