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Portola Valley, Santa Clara County, California Property Taxes

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Property Taxes in Portola Valley, California

  • Median Portola Valley, California effective property tax rate: 1.19%, significantly higher than the national median of 1.02%, and higher than the California state median of 1.21%.

  • Median Portola Valley, California home value: $2,408,886

  • Median annual Portola Valley, California tax bill: $28,193, $25,793 higher than the national median property tax bill of $2,400.

How are property taxes in Santa Clara calculated?

Property taxes in Portola Valley, 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 Portola Valley's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Portola Valley, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Portola Valley, Santa Clara County, California Property Tax Bill Calculator

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

1.19%

Estimate Property Tax Bill

$28,666

$26,601

SAVE WITH OWNWELL

$774

Average Annual Tax Savings

How Does the Portola Valley Property Tax Calculator Work?

Use this Portola Valley property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Portola Valley's median effective tax rate of 1.19% — based on actual property records in Santa Clara 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 Portola Valley's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Portola Valley: rates range from 1.19% in 94028 to 1.19% in 94028, primarily due to differences in school district levies and local assessment districts.

If your estimate is higher than expected, Ownwell can appeal your Portola Valley assessment — you only pay if we save you money.

About Portola Valley Property Taxes

About Property Taxes in Portola Valley, Santa Clara, California

Portola Valley’s median effective property tax rate of 1.19% is lower than the California state median of 1.21% and higher than the national median of 1.02%. This rate reflects the Santa Clara 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 Portola Valley. Homeowners in the 94028 ZIP code carry a median effective rate of 1.19%, while those in the same ZIP code also pay 1.19%. This reflects how school district boundaries and local assessment districts are drawn across Santa Clara County. Understanding where you live in Portola Valley can make a meaningful difference to your annual tax bill.

Portola Valley homeowners who believe their assessed value is too high can file a formal appeal with the Tax Assessor before the September 15, 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 Portola Valley, Santa Clara 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 Portola Valley's effective property tax rate to other cities in California and the median property tax rates in California and the U.S.

Property Tax Rates Across Portola Valley, Santa Clara County, California

Source: Ownwell

1.15%

1.42%

1.70%

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 Portola Valley Tax Rate

1.19%

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 Santa Clara County Tax Rate

1.31%

Median Effective California Tax Rate

1.21%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Portola Valley, Santa Clara County, California

Zip10th Percentile25th PercentileMedian Tax Rate75th Percentile90th Percentile
940281.17%1.18%1.19%1.21%1.28%

Source: Ownwell

Property Tax Assessment Values Across Portola Valley, Santa Clara County, California

When examining property taxes in Portola Valley, 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 Santa Clara County appraisal district 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 Santa Clara County, assessment notices are sent in August each year. They'll typically reach your mailbox by the middle of August.

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. For Portola Valley, the median home price is $2,408,886, with a median tax bill of $28,193. The highest median home price is in 94028 at $2,408,886. Compared with the national median property tax rate of 1.02% and national median property tax bill of $2,400, local property taxes are far higher.

Property Tax Assessment Values Across Portola Valley, Santa Clara County, California

Source: Ownwell

$248,609

$1,619,295

$2,989,980

Median Portola Valley Market Value

$2,408,886

Median Santa Clara County Market Value

$717,300

Median California Market Value

$427,605

Median United States Market Value

$235,294

Property Tax Assessment Values Across Portola Valley, Santa Clara County, California

Zip10th Percentile25th PercentileMedian Home Price75th Percentile90th Percentile
94028$401,564$1,002,602$2,408,886$6,127,637$9,661,071

Source: Ownwell

Property Tax Bills Across Portola Valley, Santa Clara County, California

Property tax bills in Portola Valley are based on the assessed value of a home and the local tax rate, so a higher market value can lead to a larger bill. With a median home price of $2,408,886, homeowners in Santa Clara County often face substantial property tax obligations, especially when assessed values rise over time. The tax bill can vary widely, with the 25th percentile at $11,997, the 75th percentile at $68,881, and the 90th percentile at $112,646. The median tax bill in ZIP code 94028 is $28,193, far above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%.

These bills affect homeowners by increasing annual housing costs and making it harder to budget. Ownwell can help homeowners save by reviewing assessments, identifying opportunities for appeals, and checking for exemptions that may lower the amount owed.

Property Tax Bills Across Portola Valley, Santa Clara County, California

Source: Ownwell

$2,906

$19,795

$36,683

Median Portola Valley Tax Bill

$28,193

Median Santa Clara County Tax Bill

$9,592

Median California Tax Bill

$5,134

Median United States Tax Bill

$2,400

Property Tax Bills Across Portola Valley, Santa Clara County, California

Zip10th Percentile25th PercentileMedian Tax Bill75th Percentile90th Percentile
94028$4,482$11,997$28,193$68,881$112,646

Source: Ownwell

Don't miss the deadline to appeal!

Frequently Asked Property Tax Questions in Portola Valley, California

How are property taxes calculated in Portola Valley, California?
Property taxes in Portola Valley, California are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.
How do I appeal my property taxes in Portola Valley, California?
To appeal your property taxes in Portola Valley, California, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.
What property tax exemptions are available in Portola Valley, California?
Common property tax exemptions in Portola Valley, California include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.
When are property taxes due in Portola Valley, California?
Property tax deadlines in Portola Valley, California vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.
How can Ownwell help reduce my property taxes in Portola Valley, California?
Ownwell provides professional property tax appeal services in Portola Valley, California. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.