San Mateo County property tax calculator 2026
Property tax in San Mateo County is primarily determined under California’s Proposition 13 framework. This calculator estimates annual tax by applying the general 1% ad valorem levy to the property’s assessed value, together with any additional voter-approved rates that may apply in a specific tax area.
Estimates only. Results may differ from official tax bills, pay stubs, or filed returns.
Estimated property tax
See our research on states with the highest property taxes
Enter the assessed value to see the estimated annual property tax.
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How it works
Property tax is calculated from assessed value under Proposition 13. The calculator multiplies that value by the base constitutional levy and allows inclusion of supplemental district rates that may apply to the parcel.
Examples
A parcel in San Mateo County is placed into a defined tax rate area that determines which local bonded indebtedness and district levies apply in addition to the statewide 1 percent base rate. Two homes with identical assessed values may therefore generate different effective rates if they fall within different tax rate areas.
Limitations and important notes
This calculator estimates property tax using only the 1% general levy. San Mateo County property tax bills may include voter-approved bonded debt and special district charges that vary by tax rate area and are not included here. Eligibility-based exemptions, such as the homeowners’ exemption, are not automatically applied. The actual tax bill may differ from this estimate.
FAQs
How is property tax calculated in San Mateo County?
Property tax is generally calculated as 1% of the assessed value, plus any voter-approved bonded debt and special assessments that apply in the property’s tax rate area.
Does this calculator include special assessments?
No. This estimate reflects only the 1% general levy. Additional bonded debt and special assessments may apply depending on location.
Are exemptions included in this estimate?
No. Eligibility-based exemptions such as the homeowners’ exemption are not automatically applied in this calculation.
Is this the exact amount on my property tax bill?
No. This is an estimated property tax based on assessed value and the general levy. The actual tax bill may differ.
Calculations are simplified and for guidance only. Always double-check results and current rules with official sources or a qualified professional before making financial decisions.