San Marcos Sales Tax Calculator
The combined sales tax rate in San Marcos, California is 8.75% in 2026 — a 7.25% California state rate plus 1.5% in local add-ons. That is the 177th lowest rate of the 483 California cities we track, and it runs below California's 8.98% average. On a $100 purchase that's $8.75 in tax for a $108.75 total.
$100.00 total
Before tax: $100.00 · Sales tax: $0.00 (0%)
State & average combined rates: Tax Foundation 2026. Local rates vary by city/county — adjust the rate for an exact figure. How we calculate →
San Marcos sales tax rate in 2026
San Marcos charges a combined sales tax rate of 8.75%: the California statewide base of 7.25% plus 1.5% in city, county and district add-ons. San Marcos is in San Diego County.
That local add-on is set by San Marcos and the taxing districts that overlap it, which is why neighboring cities in California can charge a different total even a few miles apart.
San Marcos vs the rest of California
At 8.75%, San Marcos runs below California's 8.98% statewide average combined rate by 0.23%. Among the 483 California cities we track by combined rate, San Marcos ranks the 177th lowest.
That makes San Marcos comparatively light on sales tax for California, though it's still well above zero.
Sales tax examples in San Marcos
At San Marcos's 8.75% combined rate:
$100 → $8.75 tax, $108.75 total · $1,000 → $87.50 tax, $1,087.50 total · $25,000 car purchase → $2,187 tax, $27,187 total.
Working backwards: a $1,090.00 receipt total in San Marcos means the pre-tax price was $1,002.30 and $87.70 was tax — use “Remove tax” mode above to reverse any total instantly.
A note on San Marcos's exact rate
The 8.75% rate applies within San Marcos's official city limits as published by CDTFA — Find a Sales and Use Tax Rate. Addresses with a San Marcos mailing address but outside the incorporated city line — a common situation on the edges of any city — can fall under a different, usually lower, rate.
For an address-exact rate, use the official lookup tool: CDTFA — Find a Sales and Use Tax Rate. This calculator pre-fills the published city-limits rate as a reliable starting point.
San Marcos sales tax — frequently asked questions
What is the sales tax rate in San Marcos, California?
San Marcos's combined sales tax rate is 8.75% in 2026 — 7.25% California state tax plus 1.5% in local add-ons. That's the 177th lowest rate of the 483 California cities we track.
How much is sales tax on $100 in San Marcos?
At San Marcos's 8.75% rate, sales tax on a $100 purchase is $8.75, for a $108.75 total.
How much sales tax will I pay on a $25,000 car in San Marcos?
At San Marcos's 8.75% combined rate, sales tax on a $25,000 vehicle purchase is about $2,187, for a $27,187 total before any trade-in credit or registration fees.
Is San Marcos's sales tax higher or lower than the California average?
San Marcos runs below California's 8.98% statewide average by 0.23%, ranking the 177th lowest of the 483 California cities we track.
How do I calculate sales tax backwards from a total in San Marcos?
Divide the total by 1 plus the rate. A $1,090.00 total in San Marcos works back to a $1,002.30 pre-tax price and $87.70 of tax. Use “Remove tax” mode above to do this automatically.
Does San Marcos's sales tax rate apply everywhere in the San Marcos area?
The 8.75% rate applies within San Marcos's official city limits. Nearby addresses outside the incorporated boundary can be taxed at a different rate — check CDTFA — Find a Sales and Use Tax Rate for an address-exact figure.
Compare nearby cities in California
See all 483 California cities ranked by combined sales tax rate, or compare:
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →