Businesses operating in San Mateo County, California face a combined sales tax rate of 9.625% in 2026. The 2.375% local rate is added to the 7.25% state base. Home to 770,000 residents, the county offers substantial commercial opportunities.
For a $500 purchase in San Mateo County, the sales tax would be $48.13, bringing the total to $548.13.
Business Compliance in San Mateo County
Businesses must register with the California Department of Tax and Fee Administration (CDTFA) to collect and remit sales tax. Filing frequency depends on sales volume. With a population of 770,000, San Mateo County offers significant market potential for businesses of all sizes.