Sonoma County property tax
6 days left Until this due date
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Last day to pay without a penalty: .
Read the county’s exact wording
Set by law. Check the county’s payment time and method. Updated daily.
§§ 2617 and 2704 Rev. & Tax. Code December 10 Property owners First installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m. or close of business day, whichever is later.
Not tax or legal advice; confirm with your county. Dates are shown as published by the source.
Installment timeline
2026–2027Due dates and filing windows, in one view.
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Today:
Assessment notice: not yet verified.
Appeal window: not yet verified.
How to pay
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Late payments and penalties
Penalty rules have not been verified.
A numerical example is unavailable without a verified single percentage and unit. Use the published rule or ask the county for a payoff amount.
Assessment appeals
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Exemptions
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Homeowners' Exemption
Who may qualify
Officially published
Disabled Veterans' Exemption
Property Tax Postponement
County offices
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Common questions
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When is property tax due in Sonoma County?
First secured installment: November 1, 2026 (Set by law). Second secured installment: February 1, 2027 (Set by law).
Sources
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Read the source quotations (22)
https://sonoma-county.legistar.com/LegislationDetail.aspx?GUID=85229F86-DAC1-43F9-A7B6-FB64318D4451&ID=8205297&Options=&Search=
Fiscal Year 2026-27 Secured Property Tax Rates
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https://boe.ca.gov/proptaxes/calendar.htm
First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.
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https://www.boe.ca.gov/proptaxes/calendar.htm
§§ 2617 and 2704 Rev. & Tax. Code December 10 Property owners First installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m. or close of business day, whichever is later.
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https://www.boe.ca.gov/proptaxes/calendar.htm
If the specified date falls on Saturday, Sunday, or a legal holiday, the action may be done on the next business day. (Government Code §§ 6706, 6707)
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https://boe.ca.gov/proptaxes/calendar.htm
Second installment real property taxes due and payable.
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https://www.boe.ca.gov/proptaxes/homeowners_exemption.htm
The California Constitution provides a $7,000 reduction in the taxable value for a qualifying owner-occupied home. The home must have been the principal place of residence of the owner on the lien date, January 1st.
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https://boe.ca.gov/proptaxes/dv_exemption.htm
For purposes of the Disabled Veterans' Exemption, totally disabled means that the United States Department of Veterans Affairs (USDVA) or the military service from which the veteran was discharged has either: Rated a veteran's disability at 100 percent, or Rated the disability compensation at 100 percent because the veteran is unable to secure or follow a substantially gainful occupation.
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https://sco.ca.gov/ardtax_prop_tax_postponement.html
The State Controller’s Property Tax Postponement Program allows homeowners who are seniors, are blind, or have a disability to defer current-year property taxes on their principal residence if they meet certain criteria, including at least 40 percent equity in the home and an annual household income of $57,002 or less (among other requirements). The deferment of property taxes is secured by a lien against the property which must eventually be repaid.
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https://sco.ca.gov/ardtax_prop_tax_postponement.html
Filing period closes: February 10, 2027
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https://boe.ca.gov/proptaxes/calendar.htm
First installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m. or close of business day, whichever is later.
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https://boe.ca.gov/proptaxes/calendar.htm
Second installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m., or close of business day, whichever is later.
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https://boe.ca.gov/proptaxes/calendar.htm
If the specified date falls on Saturday, Sunday, or a legal holiday, the action may be done on the next business day. (Government Code §§ 6706, 6707)
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https://www.boe.ca.gov/proptaxes/faqs/assessappeals.htm
You must file an Assessment Appeal Application, form BOE-305-AH, obtained from the clerk of the board of the county where your property is located.
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https://sonomacounty.gov/acttc/pay-your-property-tax-bill-online
View and Pay Your Property Tax Bill Online
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https://sonomacounty.gov/acttc/pay-your-property-tax-bill-online
E-Check payments - FREE (electronic debit from your checking or savings account) -Credit card payments - 2.34% per transaction -Debit card payments - 2.34% per transaction
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https://sonomacounty.gov/acttc/pay-your-property-tax-bill-online
Auditor-Controller-Treasurer-Tax Collector
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https://sonomacounty.gov/ACTTC/Revenue-Accounting/Reading-Your-Tax-Bill/
Any questions about values or assessments should be directed towards the Assessor’s Office at 707-565-1888.
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How we verified this page
Official sources, verification dates and corrections
County notes
Additional payment and filing conditions
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The second secured installment has an April 10 delinquency cutoff under Revenue and Taxation Code sections 2618 and 2705; the next-business-day rule applies when that date falls on a weekend or legal holiday.
Set by law
Property tax in Sonoma County: county, state and US
Compare Census estimates and read the sampling notes
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Census ACS 2020–2024 estimates for owner-occupied homes. The median annual tax paid is a historical survey estimate, not a quote for this year’s bill.
| Area | Median annual tax paid | Median home value | Effective rate estimate |
|---|---|---|---|
| Sonoma County | $5,695 | $815,500 | 0.70% |
| California | $5,124 | $734,700 | 0.70% |
| United States | $3,119 | $332,700 | 0.94% |
Sonoma County’s effective-rate point estimate is 0.00 percentage points above California’s and 0.24 percentage points below the US estimate.
Effective rate = median annual real estate taxes paid (B25103) ÷ median owner-occupied home value (B25077). State and US figures use their own Census medians, not averages of counties. These ratios are not rates set by law or medians of individual tax rates. Differences are not tests of statistical significance. Bounded or missing estimates stay unavailable.
Census sources, quotations and sampling uncertainty
Sonoma County
Annual taxes: $5,695 (90% margin of error: ±$106). Census table B25103_001E.
0500000US06097|5695|106|6174|107|4519|152
Home value: $815,500 (90% margin of error: ±$6,412). Census table B25077_001E.
0500000US06097|815500|6412
Estimated effective rate: 0.70%. Census source.
0500000US06097|5695|106|6174|107|4519|152
California
Annual taxes: $5,124 (90% margin of error: ±$17). Census table B25103_001E.
0400000US06|5124|17|5839|17|3825|19
Home value: $734,700 (90% margin of error: ±$1,307). Census table B25077_001E.
0400000US06|734700|1307
Estimated effective rate: 0.70%. Census source.
0400000US06|5124|17|5839|17|3825|19
United States
Annual taxes: $3,119 (90% margin of error: ±$4). Census table B25103_001E.
0100000US|3119|4|3489|4|2576|4
Home value: $332,700 (90% margin of error: ±$236). Census table B25077_001E.
0100000US|332700|236
Estimated effective rate: 0.94%. Census source.
0100000US|3119|4|3489|4|2576|4
Guides and related dates
Sonoma County property tax calculator
Estimate your bill, check exemptions and compare counties
Tools: Sonoma County, CA
Property tax calculator
Estimated annual property tax $5,695
$815,500 home value × 0.70% Census effective rate ≈ $5,695 per year. Uses the unrounded ratio; your actual bill may differ.
Estimate only. Not tax, legal or financial advice; confirm with your county.
Starts at the Census median for Sonoma County, CA.
Math and official Census sources
$5,695 median annual tax ÷ $815,500 median home value = 0.70%. Census ACS 2020–2024; a historical survey ratio, not a parcel tax rate.
0500000US06097|815500|6412
Census source. Last verified 2026-10-24.
0500000US06097|5695|106|6174|107|4519|152
Census source. Last verified 2026-10-24.
Full Sonoma County, CA calculator: exemptions, rates, dates and reminders
Prorated property tax calculator
Nearby counties and other due dates
Nearby counties
We haven’t verified a shared Census area for nearby county links.
Other counties in California due soon
Published payment dates in the next 60 days.
- Alameda County Due date:
- Amador County Due date:
- Butte County Due date:
- Calaveras County Due date:
Date sources and verification
Alameda County
Set by law. Verified October 24, 2026. Official date source
§ 2605 Rev. & Tax. Code … November 1 … Property owners … First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.
Amador County
Set by law. Verified October 25, 2026. Official date source
§ 2605 Rev. & Tax. Code | November 1 | Property owners | First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.
Butte County
Set by law. Verified October 24, 2026. Official date source
§ 2605 Rev. & Tax. Code November 1 Property owners First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.
Calaveras County
Set by law. Verified October 25, 2026. Official date source
§ 2605 Rev. & Tax. Code | November 1 | Property owners | First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.
Updated , from cited verification dates. Individual sources may have earlier checks.