Sonoma, Napa County, California Property Taxes
Property Taxes in Sonoma, California
Median Sonoma, California effective property tax rate: 1.12%, significantly higher than the national median of 1.02%, and lower than the California state median of 1.21%.
Median Sonoma, California home value: $2,203,942
Median annual Sonoma, California tax bill: $24,544, higher than the national median property tax bill of $2,400.
How are property taxes in Napa calculated?
Property taxes in Sonoma, California are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Understanding Sonoma's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Sonoma, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Sonoma, Napa County, California Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
1.12%
Estimate Property Tax Bill
$24,684
$22,906
How Does the Sonoma Property Tax Calculator Work?
Use this Sonoma property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Sonoma's median effective tax rate of 1.12% — based on actual property records in Napa County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Sonoma's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.
Sonoma's property tax rate is higher than the California state median tax rate of 1.21%, and the median property tax bill is $24,544, which is $22,144 higher than the state median. Your bill may vary by ZIP code within Sonoma: rates range from $24,544 in 95476 to $24,544 in 95476, primarily due to differences in school district levies and local assessment districts.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Sonoma.
About Sonoma Property Taxes
About Property Taxes in Sonoma, Napa, California
Sonoma’s median effective property tax rate of 1.12% is lower than the California state median of 1.21% and higher than the national median of 1.02%. This rate reflects the Napa County base levy combined with local school district levies and Mello-Roos Community Facility Districts that vary by subdivision throughout the city.
Property tax rates are not uniform across Sonoma. Homeowners in ZIP code 95476 carry a median effective rate of 1.12%, while those in 95476 pay 1.12%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Napa County. Understanding which part of Sonoma you live in can make a meaningful difference to your annual tax bill.
Sonoma homeowners who believe their assessed value is too high can file a formal appeal with the Tax Assessor before the November 30, 2026 deadline each year.
If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.
Property Tax Rates Across Sonoma, Napa County, California
As noted earlier, local government entities set tax rates, which can vary widely within a state.
Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.
While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.
Below, you can compare Sonoma's effective property tax rate to other cities in California and the median property tax rates in California and the U.S.
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Sonoma Tax Rate
1.12%
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Napa County Tax Rate
1.24%
Median Effective California Tax Rate
1.21%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Sonoma, Napa County, California
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 95476 | 1.11% | 1.12% | 1.12% | 1.12% | 1.13% |
Source: Ownwell
Property Tax Assessment Values Across Sonoma, Napa County, California
When examining property taxes in Sonoma, California, understanding the distinction between "market value" and "assessed value" is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Napa County assessor estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.
Assessment notices:
In Napa County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month when notices are sent.
Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Sonoma.
For example, the median home price in Sonoma is $2,203,942, with tax bills ranging significantly across the county. 95476 has the highest median home price at $2,203,942.
Property Tax Assessment Values Across Sonoma, Napa County, California
Source: Ownwell
$243,131
$1,223,537
$2,203,942
Median Sonoma Market Value
$2,203,942
Median Napa County Market Value
$488,969
Median California Market Value
$427,605
Median United States Market Value
$235,294
Property Tax Assessment Values Across Sonoma, Napa County, California
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 95476 | $571,028 | $1,223,222 | $2,203,942 | $3,269,396 | $4,767,480 |
Source: Ownwell
Property Tax Bills Across Sonoma, Napa County, California
Property tax bills in Sonoma are based on the assessed value of a home, not the market price alone. Local tax rates are applied to that assessed value, and the final bill can also reflect exemptions or other adjustments that change what a homeowner owes.
For Sonoma homeowners, the size of the tax bill can vary widely because it depends on both the home’s assessed value and the local rate applied in Napa County. With a median home price of $2,203,942, property taxes can be substantial. The 25th percentile tax bill is $13,643, while the 75th percentile is $36,480 and the 90th percentile reaches $53,243. The median tax bill in the area is $24,544, which is far above the national median property tax bill of $2,400 and well above the national median property tax rate of 1.02%. For homeowners, that means property taxes can be a major ongoing housing cost and an important factor in overall affordability.
Median Sonoma Tax Bill
$24,544
Median Napa County Tax Bill
$6,259
Median California Tax Bill
$5,134
Median United States Tax Bill
$2,400
Property Tax Bills Across Sonoma, Napa County, California
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 95476 | $6,360 | $13,643 | $24,544 | $36,480 | $53,243 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | November 30 |
Links | |
|---|---|
| Napa Tax Assessor | |
| Website | common1.mptsweb.com |