AppealDesk

Alameda County Property Tax Appeal, California

Travis BunnTravis Bunn·Updated July 22, 2026

Watch: How to appeal your property taxes in Alameda County

Alameda County is located in the San Francisco Bay Area of California with Oakland as its county seat. The county includes major cities such as Oakland, Berkeley, Fremont, Hayward, Alameda, and San Leandro. With a median home value of approximately $1,090,600 and an effective property tax rate of 0.80%, Alameda County homeowners face significantly higher property tax burdens than both state and national averages. Property tax appeals are particularly important here given the high property values and dense urban population, where even a 10% over-assessment can cost homeowners thousands annually.

Notable cities: Oakland, Berkeley, Fremont, Hayward, Alameda, San Leandro

Median Home

$1,090,600

Tax Rate

0.80%

Annual Tax

$8,697

Population

1,636,636

On the typical Alameda County home, valued near $1,090,600 at the county’s effective tax rate of 0.80%, 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: September 15, 2026

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

Regular assessment appeals must be filed between July 2 and September 15, 2026. For supplemental or escape assessments, appeals must be filed within 60 days of the notice or bill mailing date. If September 15 falls on a Saturday, Sunday, or legal holiday, applications postmarked by the next business day are considered timely.

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

How Alameda County Assesses Property

100%of market value

Assessed by: Alameda County Assessor's Office

Assessment cycle: annual

Notices typically mailed: Mid-July to August

In California, properties are assessed at 100% of their market value as of the January 1 lien date. For example, if your home's market value is $1,090,600, at California's 100% assessment ratio your assessed value would be $1,090,600, resulting in approximately $8,725 in annual property taxes at Alameda County's effective rate of 0.80%. Assessment notices are mailed in mid-July each year to all real property owners.

The Appeal Process

Appeals are heard by the Assessment Appeals Board. The Assessment Appeals Board conducts formal hearings where both the property owner and Assessor's Office present evidence. You'll need to provide five copies of all documents at the hearing. The Board reviews all evidence to determine fair market value as of January 1 of the assessment year.

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Step 1: Contact the Alameda County Assessor's Office at (510) 272-3787 to request an informal decline in market value review before filing a formal appeal. A certified appraiser will review your evidence including comparable sales and property condition documentation.

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Step 2: Gather evidence to support your appeal including comparable sales near the January 1 lien date, property condition photos, recent appraisals, repair estimates, and any documentation showing factors affecting your property's value.

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Step 3: Complete the Assessment Appeal Application (BOE-305-AH) online at www.acgov.org/clerk/assessment.htm or submit paper applications in duplicate. Include the $50 non-refundable processing fee payable to County of Alameda and file between July 2 and September 15.

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Step 4: Submit your application by mail to Alameda County Assessment Appeals Board, 1221 Oak Street, Suite 536, Oakland, CA 94612, deliver in person, or file online. Keep proof of filing. Applications sent by fax or email are not considered valid.

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Step 5: Attend your hearing before the Assessment Appeals Board or Equalization Hearing Officer. Bring five copies of all supporting documents. The Board considers all evidence presented by both the property owner and Assessor's Office. Decisions can take up to two years, though many cases resolve sooner.

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Step 6: If dissatisfied with the Assessment Appeals Board decision, you may appeal to the California State Board of Equalization within specific timeframes.

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Step 7: As a final option, property owners can pursue judicial review by filing in Superior Court if they disagree with the State Board of Equalization's decision.

Required form: Assessment Appeal Application (BOE-305-AH)

Filing Methods

online:Visit http://www.acgov.org/clerk/assessment.htm to access the online application system
mail:Mail completed application in duplicate with $50 filing fee to: Alameda County Assessment Appeals Board, 1221 Oak Street, Suite 536, Oakland, CA 94612
in-person:Deliver to Clerk of the Board, 1221 Oak Street, Suite 536, Oakland, CA 94612

Evidence to Bring

Comparable sales from near January 1 lien dateProperty condition photos documenting defects or issuesRecent appraisals or broker price opinionsRepair estimates or construction documentationIncome and expense statements for rental properties

Alameda County Assessor Contact

Alameda County Assessor's Office

Phone: (510) 272-3787

Address: 1221 Oak Street, Room 145, Oakland, CA 94612

Website: https://www.acassessor.org

Online Portal: http://www.acgov.org/clerk/assessment.htm

Hours: 9:00 AM - 4:30 PM, Monday-Friday (closed on county holidays)

Tax Exemptions in Alameda County

Homeowners' Exemption

Up to $7,000 off assessed value (saves approximately $70-$80 per year)

Reduces the assessed value of your principal residence, lowering your annual property tax bill.

Eligibility: Owner-occupied primary residence. Property must be occupied as the principal place of residence on the lien date (January 1).Deadline: February 15 for first year; auto-renewed annually thereafter. Late claims accepted until December 10 with possible penalty.

Disabled Veterans' Exemption

Basic exemption: $180,671; Low-Income exemption: $271,009 (amounts adjusted annually)

Significant property tax reduction for qualifying disabled veterans rated 100% disabled by the VA.

Eligibility: Veterans rated 100% disabled due to service-connected injury or disease, or receiving 100% disability compensation due to unemployability. Low-income option available for veterans meeting income limits.Deadline: February 15 for first year. Late claims accepted until December 10. Must reapply if property changes or income exceeds limits.

Property Tax Postponement Program

Defers 100% of property taxes as a loan from the state

State program allowing eligible senior citizens, blind, or disabled persons to defer current-year property taxes on their principal residence.

Eligibility: Age 62 or older, blind, or disabled; at least 40% equity in home; annual household income of $51,762 or less; no reverse mortgage or home equity loan.Deadline: Must apply by February 10 for current fiscal year

Parent-Child/Grandparent-Grandchild Transfer Exclusion

Maintains existing Proposition 13 base year value, avoiding reassessment at current market value

Allows transfer of property tax base value between eligible family members, preventing reassessment upon transfer.

Eligibility: Transfers between parents and children, or grandparents and grandchildren (if parents deceased) occurring on or after April 1, 2021. Limited to family home of any value plus up to $1 million of other property.Deadline: Within 3 years of date of transfer or prior to transfer of property to a third party

Alameda 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 Alameda County for 2026?
The deadline to file a regular assessment appeal in Alameda County is September 15, 2026. The filing period runs from July 2 through September 15 each year. If September 15 falls on a Saturday, Sunday, or legal holiday, applications postmarked by the next business day are considered timely. For supplemental or escape assessments, you have 60 days from the mailing date of the notice or bill to file your appeal. Missing these deadlines means you lose your right to contest that year's assessed value.
How do I file a property tax appeal online in Alameda County?
Alameda County offers an online assessment appeal application system at http://www.acgov.org/clerk/assessment.htm. You'll need to complete the BOE-305-AH form electronically and submit the required $50 processing fee. While online filing is encouraged, it's not mandatory, you can also file paper applications in duplicate by mail or in person. The online system streamlines the process and provides immediate confirmation of receipt. However, note that applications sent by fax or email are not considered valid; only online portal submissions, mail, or in-person delivery are accepted.
What is the homestead exemption worth in Alameda County?
The Homeowners' Exemption in Alameda County reduces your assessed value by up to $7,000, which saves approximately $70-$80 per year in property taxes. This exemption applies to your principal residence only. You must apply by February 15 for the first year, after which it automatically renews annually as long as the property remains your primary residence. Late claims are accepted until December 10 but may be subject to penalties. If you no longer qualify because you've moved, you must notify the Assessor's Office by December 10 to avoid penalties.
Should I request an informal review before filing a formal appeal in Alameda County?
Yes, Alameda County strongly encourages property owners to request an informal decline in market value review before filing a formal appeal. This free service involves a certified appraiser from the Assessor's Office reviewing your documentation, including comparable sales, recent appraisals, and property condition photos. If the Assessor agrees your property is overvalued and reduces your assessment, you may avoid the formal appeal process entirely. If you're not satisfied with the informal review results, you can still file a formal appeal with the Assessment Appeals Board by the September 15 deadline. There's no cost for the informal review, and it can save significant time.
What evidence do I need for an Alameda County property tax appeal?
For a successful Alameda County property tax appeal, you need evidence showing your property's market value as of January 1 of the assessment year (the lien date). The most important evidence includes comparable sales of similar properties from near the lien date, property condition photos documenting any defects or issues, recent appraisals or broker price opinions, and repair estimates or construction documentation. For rental properties, include income and expense statements. At the hearing, you must provide five copies of all documents to the Clerk. The Assessment Appeals Board weighs all evidence presented by both you and the Assessor's Office to determine fair market value.
Do I have to pay my property taxes while my appeal is pending in Alameda County?
Yes, you must pay your property taxes on time even while your appeal is pending to avoid penalties and interest charges. Property tax appeals in Alameda County do not pause your payment obligations. The first installment is due November 1 and delinquent after December 10 (10% penalty), while the second installment is due February 1 and delinquent after April 10 (10% penalty plus $10 cost). If your appeal is successful and results in a lower assessed value, Alameda County will issue a refund for any overpayment or provide an adjusted bill for future installments once the decision is finalized.
How long does the property tax appeal process take in Alameda County?
Once you file a timely appeal application with the Alameda County Assessment Appeals Board, the Clerk will schedule a hearing in accordance with legal requirements. California law allows up to two years for a decision under Revenue and Taxation Code Section 1604, though many cases resolve much sooner. Some appeals are resolved through stipulation agreements between the property owner and Assessor before a formal hearing. The timeline depends on the complexity of your case, the Board's schedule, and whether you pursue an informal review first. If you're dissatisfied with the Board's decision, you have additional appeal options to the State Board of Equalization.
How much can I save by appealing my property taxes in Alameda County?
The savings from a successful property tax appeal in Alameda County depend on the degree of overassessment. At Alameda County's effective tax rate of 0.80%, every $100,000 reduction in assessed value saves approximately $800 per year in property taxes. For example, on a home assessed at $1,090,600 (the county median), a 10% over-assessment means you're overpaying approximately $873 annually. These savings compound year after year until the next reassessment event. Given the high property values in Alameda County, even modest assessment reductions can result in significant long-term savings, especially considering Proposition 13's limits on annual assessment increases.

Official Resources

Alameda County Assessor Website →

Official website for property assessments, exemption applications, and decline in market value reviews.

Alameda County Assessment Appeals Board →

File assessment appeals online, download BOE-305-AH forms, and access hearing information.

Alameda County Property Search →

Look up your property's assessed value, parcel number, and assessment history.

California State Board of Equalization - Property Tax Appeals →

State resource guide explaining residential property assessment appeals process and homeowner rights.

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

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

Sources: https://www.acassessor.org | https://www.acgov.org/clerk/assessment.htm | https://smartasset.com/taxes/alameda-county-california-property-tax-calculator | https://www.boe.ca.gov/proptaxes/pdf/filingperiods.pdf | https://worldpopulationreview.com/us-counties/california/alameda-county

Last verified: 2026-07-22