AppealDesk

Santa Clara County Property Tax Appeal, California

Travis BunnTravis Bunn·Updated July 24, 2026

Watch: How to appeal your property taxes in Santa Clara County

Santa Clara County is located in Northern California with San Jose as the county seat, serving as the heart of Silicon Valley and home to major technology centers including Cupertino, Mountain View, Palo Alto, Sunnyvale, and Santa Clara. With a population of approximately 1.9 million residents, it is California's 6th most populous county. The median home value of $1,555,600 is among the highest in the nation, significantly exceeding both California's statewide median and the national average, while the effective property tax rate of 0.64% is relatively low. However, the median annual property tax bill of $10,000 is tied with San Francisco County for highest in California and far exceeds the national median of $2,400, making property tax appeals particularly valuable for homeowners seeking to reduce their substantial tax burden.

Notable cities: San Jose, Cupertino, Mountain View, Palo Alto, Sunnyvale, Santa Clara

Median Home

$1,555,600

Tax Rate

0.64%

Annual Tax

$10,000

Population

1,920,872

On the typical Santa Clara County home, valued near $1,555,600 at the county’s effective tax rate of 0.64%, an over-assessment of even 10% means you are overpaying year after year until you appeal it. Here is how to find out if yours qualifies.

2026 Appeal Deadline: July 2 through September 15, 2026 for regular assessment roll appeals

That is at most 97 days away. Your exact date is on your assessment notice, so do not wait on it.

Santa Clara County offers two appeal options: (1) An informal review with the Assessor's Office, which must be filed by August 1, 2026, at no cost; and (2) A formal appeal with the Assessment Appeals Board during the regular filing period of July 2 through September 15, 2026, with a $290 filing fee for residential properties. Both processes evaluate your property's value as of January 1, 2026 (the lien date). For supplemental and escape assessments, the deadline is generally 60 days from the date on the notice.

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California residential street with palm trees at sunset. Santa Clara County appeal guide.

How Santa Clara County Assesses Property

100%of market value

Assessed by: Santa Clara County Office of the Assessor

Assessment cycle: annual

Notices typically mailed: Late June to early August

In Santa Clara County, market value is what a willing buyer would pay a willing seller in an open market, while assessed value is the taxable value determined by the Assessor's Office. California uses a 100% assessment ratio, meaning properties are assessed at their full market value (subject to Proposition 13 limits). For example: If your home's market value is $1,555,600, at California's 100% assessment ratio your assessed value would be $1,555,600, resulting in approximately $9,956 in annual taxes at the county's effective rate of 0.64%.

The Appeal Process

Appeals are heard by the Assessment Appeals Board. Hearings are scheduled before Assessment Appeals hearing officers or one of four Assessment Appeals Boards. The hearing is an informal proceeding where you present your evidence and the Assessor's Office presents their position, and the hearing officer or board members may ask questions before issuing a decision.

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Step 1: Determine which appeal path to pursue. File an informal review request with the Assessor's Office by August 1, 2026 (free) or file a formal appeal with the Assessment Appeals Board between July 2 and September 15, 2026 ($290 filing fee for residential properties). The informal review is faster but non-binding, while the formal appeal results in a binding decision.

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Step 2: Gather evidence to support your claim that your property is overassessed. Collect comparable sales data from properties that sold near January 1, 2026 in your neighborhood, photographs showing property condition issues, repair estimates for needed work, and your property's assessment notice. The strongest evidence is recent comparable sales of similar properties that sold for less than your assessed value.

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Step 3: Complete and submit the appropriate application. For informal reviews, contact the Assessor's Office at (408) 299-5500 or submit a request online. For formal appeals, complete form BOE-305-AH and submit it to the Office of the Clerk of the Board with the $290 filing fee (payment accepted by cash, check, money order, or credit card with a 2.22% service fee).

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Step 4: Pay your property taxes by the December 10 and April 10 deadlines even while your appeal is pending. Filing an appeal does not relieve you of the obligation to pay taxes on time. If your appeal is successful, you will receive a refund for overpaid taxes plus interest.

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Step 5: Attend your hearing before an Assessment Appeals hearing officer or one of four Assessment Appeals Boards. Present your evidence showing why your property's assessed value should be reduced. The hearing officer or board will review your evidence, consider the Assessor's response, and issue a decision. You cannot be assessed at a higher value through this process.

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Step 6: If you disagree with the Assessment Appeals Board decision, you have the right to contest their decision in Superior Court. The board's decision is final and cannot be reheard or reconsidered by the Assessment Appeals Board.

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Step 7: For further appeals beyond the county level, you may file a legal challenge in Superior Court or seek review through the California State Board of Equalization for specific assessment issues involving state-assessable property.

Required form: Application for Changed Assessment (BOE-305-AH) for formal appeals; informal review requests can be submitted via letter or online

Filing Methods

online:Santa Clara County Assessment Appeals Online Portal at https://cob.santaclaracounty.gov/appeal-your-property-taxes
mail:Office of the Clerk of the Board of Supervisors, Assessment Appeals Division, County Government Center, 70 West Hedding Street, East Wing, 11th Floor, San Jose, CA 95110
in-person:Office of the Clerk of the Board, County Government Center, 70 West Hedding Street, East Wing, 11th Floor, San Jose, CA 95110

Evidence to Bring

Comparable sales data from properties that sold near the January 1 lien datePhotographs documenting property condition, defects, or needed repairsRepair estimates or contractor bids for needed workProperty appraisal reports from licensed appraisersIncome and expense statements for income-producing propertiesDocumentation of property characteristics and features

Santa Clara County Assessor Contact

Santa Clara County Office of the Assessor

Website: https://asr.santaclaracounty.gov

Online Portal: https://cob.santaclaracounty.gov/appeal-your-property-taxes

Hours: Monday through Friday, 8:00 AM to 5:00 PM (excluding holidays)

Tax Exemptions in Santa Clara County

Homeowners' Exemption

$7,000 reduction in assessed value (approximately $70-$80 annual tax savings)

Reduces the assessed value of an owner-occupied primary residence

Eligibility: You must own and occupy the property as your principal place of residence as of January 1 each year. Must be property owner, co-owner, or purchaser named in a contract of sale.Deadline: February 15 for full exemption; late filing by December 10 provides reduced exemption of $5,600

Disabled Veterans' Exemption

Up to $100,000 reduction in assessed value; can increase to $150,000 with low-income qualification

Provides property tax relief for qualifying disabled veterans

Eligibility: Veteran must be rated 100% disabled by the U.S. Veterans Administration due to service-connected injury or disease, or rated 100% due to inability to secure substantially gainful occupation. Property must be veteran's principal place of residence.Deadline: February 15 for initial filing; exemption continues automatically once granted until claimant becomes ineligible

Property Tax Postponement Program

Deferral of current-year property taxes (state pays taxes as loan secured by property)

Allows eligible senior citizens, blind, or disabled persons to defer payment of property taxes on their principal residence

Eligibility: Must be age 62 or older, or blind, or disabled; meet income requirements; have at least 40% equity in the home; property must be principal residence in CaliforniaDeadline: February 10 annually

Santa Clara County Appeal Packet · $49

Comparable sales evidence, county-specific filing guide, and professional cover letter. Enter your address to get started.

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Frequently Asked Questions

What is the deadline to appeal my property taxes in Santa Clara County for 2026?
Santa Clara County has two property tax appeal options with different deadlines for 2026. The informal review with the Assessor's Office must be filed by August 1, 2026, and is completely free. The formal appeal with the Assessment Appeals Board has a filing period from July 2 through September 15, 2026, and requires a $290 filing fee for residential properties. Both processes evaluate your property as of the January 1, 2026 lien date. If you miss both deadlines, you generally must wait until the next year's filing period, though supplemental and escape assessments have their own 60-day deadline from the notice date.
How much does it cost to file a property tax appeal in Santa Clara County?
Beginning June 1, 2026, Santa Clara County charges a nonrefundable administrative processing fee for formal assessment appeals. Residential properties, vacant land, and agricultural properties pay $290 per parcel. Commercial, business, and multifamily properties with 5 or more units pay $675 per parcel. The informal review option through the Assessor's Office is completely free and has no filing fee. Payment for formal appeals is accepted by cash, check, money order, or credit card, though credit card payments include an additional 2.22% service fee with a minimum of $1.49 per transaction. The fee may be waived for applicants who receive public assistance.
What is the homestead exemption worth in Santa Clara County?
The Homeowners' Exemption in Santa Clara County reduces your property's assessed value by $7,000, which translates to approximately $70 to $80 in annual property tax savings. This exemption is available if you own and occupy your home as your principal place of residence as of January 1 each year. You must file a claim by February 15 to receive the full exemption amount. If you file late, between February 16 and December 10, you can still claim a reduced exemption of $5,600. Once filed and approved, the exemption continues automatically each year as long as the property remains your primary residence.
How do I file a property tax appeal online in Santa Clara County?
Santa Clara County offers an online portal for filing formal property tax appeals at https://cob.santaclaracounty.gov/appeal-your-property-taxes. You'll need to complete the Application for Changed Assessment (form BOE-305-AH) and pay the $290 filing fee online using a credit card, check, money order, or cash. The online system allows you to submit your application, upload supporting evidence such as comparable sales and photographs, and track your appeal status. Make sure you have your Assessor's Parcel Number (APN) from your assessment notice, and file between July 2 and September 15, 2026 for regular assessment roll appeals.
What happens at an Assessment Appeals Board hearing in Santa Clara County?
At a Santa Clara County assessment appeal hearing, you present your case before an Assessment Appeals hearing officer or one of four Assessment Appeals Boards. The hearing is informal, and you'll have the opportunity to present evidence supporting your claim that your property is overassessed, such as comparable sales, photographs, and repair estimates. The Assessor's Office will also present their position defending the current assessed value. Board members or the hearing officer may ask questions to clarify the evidence. After reviewing all evidence, they will issue a Written Findings of Facts explaining their decision. Your assessed value can be reduced or stay the same but cannot be increased through this process.
How much can I save by appealing my property taxes in Santa Clara County?
In Santa Clara County, with a median home value of $1,555,600 and an effective tax rate of 0.64%, even a modest assessment reduction can yield significant savings. For example, if your property is overassessed by 10% ($155,560), successfully appealing could save you approximately $996 per year in property taxes. If overassessed by 20%, you could save nearly $2,000 annually. These savings continue every year until your property is reassessed due to a change in ownership or new construction. With Santa Clara County's extremely high property values, verifying your assessment accuracy through an appeal can result in thousands of dollars in savings over time.
What evidence do I need for a successful Santa Clara County property tax appeal?
The most compelling evidence for a Santa Clara County property tax appeal is recent comparable sales data from similar properties in your neighborhood that sold near the January 1, 2026 lien date for less than your assessed value. You should also include photographs documenting any property condition issues, defects, needed repairs, or features that negatively impact value. Contractor estimates or bids for necessary repairs strengthen your case. A professional appraisal from a licensed appraiser can be valuable but isn't required. Avoid using online estimates from Zillow or Redfin, as the Assessment Appeals Board does not consider these reliable evidence. Focus on actual sales of comparable properties with similar size, age, condition, and location.
Can I still pay my property taxes while my appeal is pending in Santa Clara County?
Yes, you must continue to pay your property taxes by the December 10 and April 10 deadlines even while your appeal is pending in Santa Clara County. Filing an assessment appeal does not relieve you from the obligation to pay taxes on time, and failure to pay will result in penalties and interest charges. If your appeal is successful and results in a lower assessed value, you will receive a refund for any overpaid taxes plus interest on the overpaid amount for the tax year(s) you appealed. The Tax Collector's Office processes refunds and can be reached at (408) 808-7979. It's important to pay on time to avoid penalties regardless of your appeal status.

Official Resources

Santa Clara County Assessor's Office →

Official county assessor website with property search tools, exemption applications, and assessment information.

Santa Clara County Assessment Appeals Online Portal →

File assessment appeals online, access forms, track appeal status, and view hearing schedules.

California State Board of Equalization Property Tax Resources →

Statewide property tax information, Publication 30 (Residential Property Assessment Appeals guide), and appeals procedures.

Santa Clara County Property Tax Information →

View and pay property taxes, access exemption programs, and find tax payment deadline information.

For state-wide appeal information including California's assessment ratio and deadlines, see our California Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

More California Counties

Alameda County (Oakland)Butte County (Chico)Contra Costa County (Martinez)El Dorado County (Placerville)Fresno County (Fresno)Imperial County (El Centro)
← All California property tax appeal info

Sources: https://cob.santaclaracounty.gov/appeal-your-property-taxes | https://asr.santaclaracounty.gov | https://www.overassessed.co/learn/santa-clara-property-tax-deadlines | https://smartasset.com/taxes/santa-clara-county-california-property-tax-calculator | https://www.sccassessor.org/online-services/exemptions/homeowners | https://worldpopulationreview.com/us-counties/california/santa-clara-county

Last verified: 2026-07-24