Sonoma County property tax calculator 2026
This Sonoma County property tax calculator provides an estimated annual property tax based on assessed value and a combined local property tax rate. Sonoma County property taxes include the statewide base levy plus additional voter-approved indebtedness and special assessments that vary by tax-rate area.
Estimates only. Loan terms and approval depend on lender underwriting.
Estimated property tax
Enter the assessed value to see the estimated annual property tax.
How it works
In Sonoma County, property tax is based on assessed value under California law. Real property is generally reassessed to market value when ownership changes or new construction is completed, establishing a new base-year value. Annual increases to the factored base-year value are generally limited to no more than 2% per year. The taxable value is typically the lower of current market value or the factored base-year value. The statewide base rate is 1% of taxable value, and additional voter-approved rates may apply depending on the property’s tax-rate area.
Examples
When a property in Sonoma County is reassessed following a transfer or new construction, a supplemental tax bill may be generated in addition to the regular annual levy. For example, if the updated assessed value becomes 720,000 mid-year, the additional tax is calculated separately from the secured roll billing cycle. The estimator reflects the primary annual roll value rather than interim adjustments.
Limitations and important notes
This calculator provides an estimated property tax only. In Sonoma County, total rates vary by tax-rate area because voter-approved bonds and special assessments differ across geographic areas. Disabled veteran exemption amounts are adjusted for inflation and vary by eligibility and year. Your actual tax bill may differ based on your specific tax-rate area, exemptions, and assessment history.
FAQs
Is Sonoma County property tax based on assessed value?
Yes. Property tax is based on assessed value, which is generally the lower of current market value or the factored base-year value under California law.
What is the base property tax rate in Sonoma County?
The statewide base ad valorem property tax rate is 1% of taxable value, with additional voter-approved rates that may apply depending on location.
Is there a homeowners’ exemption in Sonoma County?
Yes. California provides a homeowners’ exemption that reduces taxable value by 7,000 for a qualifying owner-occupied principal residence.
Can this calculator show my exact tax bill?
No. This tool provides an estimated property tax based on user inputs and a combined local property tax rate. Actual tax bills vary by tax-rate area and individual circumstances.
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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.