Foster City, California sales tax rate: 9.375%
Last updated Checked monthly
The sales tax rate in Foster City, California is 9.375%. That’s the 7.25% statewide rate plus 2.125% in local taxes. It’s higher than 207 of the 310 California cities we checked, and 3 other cities pay the same.
Calculated by the 
Sales Tax APIThe same engine Zamp customers use.Foster City combined rate
9.375%
- California state
- 6.25%
- San Mateo CountyCounty
- 1%
- San Mateo CountySpecial district
- 2.125%
Foster City sales tax calculator
Enter a price and what you’re selling.
- CaliforniaState · 6.25%$6.25
- San Mateo CountyCounty · 1%$1.00
- San Mateo CountySpecial district · 2.125%$2.13
Charging this at checkout? Zamp calculates it on every order and files the returns.
Book a demoFoster City sales tax rate breakdown
State, county and special district taxes add up to 9.375%. District lines don’t follow city limits, so some Foster City addresses pay a different rate.
| Jurisdiction | Type | Rate |
|---|---|---|
| State of California | State | 6.25% |
| San Mateo County | County | 1% |
| San Mateo County | Special district | 2.125% |
| Combined rate | 9.375% |
Rate history
- July 20239.375%
- July 20249.375%
- July 20259.375%
- July 20269.375%
- Today9.375%
No change since July 2023.
Sales tax near Foster City
Closest cities
- San Mateo3 mi9.625%
- Redwood City4 mi9.875%
- Belmont4 mi9.875%
- San Carlos5 mi9.375%
- Burlingame6 mi9.375%
- Hayward9 mi10.75%
- South San Francisco9 mi9.875%
- San Leandro11 mi10.75%
Elsewhere in San Mateo County
- San Mateo9.625%
- Daly City9.375%
- Redwood City9.875%
- South San Francisco9.875%
- Burlingame9.375%
- San Carlos9.375%
- Belmont9.875%
Charge the right rate in Foster City, on every order.
Zamp calculates tax at each customer’s address, special districts included, then files and pays every California return for you, with a sales tax team you can call.
Foster City sales tax questions.
Still have questions? Call us at 1-866-438-9267 or email us at support@zamp.com.
What is the sales tax rate in Foster City, California?
The combined sales tax rate in Foster City is 9.375% as of November 2, 2026. It’s made up of 6.25% California state tax, 1% San Mateo County, 2.125% San Mateo County.
Why does Foster City pay San Mateo County tax?
A special district such as San Mateo County levies its own sales tax on top of the state, county rates. District lines don’t always follow city limits, so an address a few streets away can have a different rate. This rate was calculated for Foster City’s 94404 ZIP code; the calculator prices any exact address.
Is SaaS taxable in Foster City?
No.
Do online sellers have to collect sales tax in Foster City?
Yes, if they have nexus in California: more than $500,000 in California sales in the previous or current calendar year, or a physical presence in the state. They register with the California Department of Tax and Fee Administration (CDTFA) and charge the rate at the buyer’s address.
Sources. California Department of Tax and Fee Administration (CDTFA) · Zamp Sales Tax API, for Foster City’s 94404 ZIP code. Rates are checked monthly and are for information, not tax advice.
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