The statewide tax rate is 7.25%. In most areas of California, local jurisdictions have added district taxes that increase the tax owed by a seller. Those district tax rates range from 0.10% to 2.00%. Some areas may have more than one district tax in effect.
Many sellers believe there is a general exemption from sales tax for labor charges. However, in California many types of labor charges are subject to tax. Tax applies to charges for producing, fabricating, or processing tangible personal property for your customers.
In general, businesses which provide a service that does not result in a tangible good are exempt from sales tax, as it only applies to goods. For example a freelance writer or a tradesperson is not required to remit sales tax, although a carpenter making custom furniture is so required.
Professional services are not subject to sales tax in the state of California.
Generally, the amount you may need to set aside could range from 20% to 35% of your 1099 income, less any deductions that you're eligible to claim.