Alameda County Property Tax Rates by City, Area, and Tax District 2026
Alameda County has a 0.78% estimated effective property tax rate, with a median annual property tax of about $8,474. Actual bills vary because assessed values, tax-rate areas, exemptions, bonds, and special charges differ by parcel.
Effective Tax Rate
0.78%
Median Property Tax
$8,474
Tax per $100K
$780
Last Update
August 2026
Alameda County Property Tax 2026-27
Alameda County Property Tax Rate
Alameda County property tax rates start with the California 1% general tax rate and add voter-approved debt service. Fixed charges, special assessments, parcel taxes, and CFD or Mello-Roos charges can increase the final bill and may vary by parcel.
Base rate
1.0000% general ad valorem tax under Proposition 13.
Added rates
Debt service and local voter-approved bond rates vary by TRA.
Direct charges
Special assessments and parcel charges are added separately.
Area
Representative Rate
Alameda
1.2185%
Albany
1.2450%
Berkeley
1.2610%
Castro Valley
1.1850%
Countywide-Unitary
1.0000%
Dublin
1.1735%
Emeryville
1.2580%
Fremont
1.1620%
Hayward
1.1945%
Livermore
1.1810%
Mountain House School
1.1550%
Newark
1.1840%
Oakland
1.3725%
Piedmont
1.2850%
Pleasanton
1.1590%
San Leandro
1.2230%
San Lorenzo
1.1820%
Sunol
1.1390%
Union City
1.2360%
Other Alameda County Property Tools
Property tax research often requires more than a tax-rate estimate. California Property Checker also provides property-focused tools that can help users examine a parcel, estimate potential taxes, review transfer-related charges, and understand the property’s geographic or zoning context.
Alameda County Property Search
Search property information using owner name, address, parcel number, city, ZIP code, and other available property filters.
Alameda Property Tax Calculator
Estimate annual property taxes using an estimated property value and applicable local tax-rate information for the parcel.
Alameda Doc Stamp Calculator
Estimate applicable documentary or transfer-related charges associated with qualifying real estate transactions and property transfers.
Alameda County Zoning and Maps
Explore parcel locations, zoning information, property boundaries, maps, and other geographic details connected with Alameda County real estate.
How Property Tax Rates Are Applied in Alameda County
The amount shown on an Alameda County property tax bill is driven primarily by the property’s taxable assessed value and the charges assigned to its tax-rate area. California’s Proposition 13 framework generally establishes a 1% base property tax on taxable value, with additional voter-approved indebtedness and other charges potentially added. A property’s assessment history can therefore matter as much as its current market value.
Assessed Value Is the Starting Point
For most property subject to Proposition 13, the assessed value is based on the property’s applicable assessment history rather than simply its current market price. Annual increases are generally limited to inflation adjustments of up to 2%, unless a reassessment event occurs.
The Tax Rate Is Applied to Taxable Value
The basic property tax is calculated from taxable assessed value rather than automatically applying a percentage to today’s market value. Exemptions or other adjustments can reduce the taxable amount used to determine the final obligation.
Tax-Rate Areas Combine Local Charges
Alameda County properties are assigned to tax-rate areas that identify the combination of taxing agencies and applicable levies for a particular location. Two homes several blocks apart can therefore have different total tax obligations when their district boundaries differ.
Special Assessments Can Increase the Bill
Some charges appearing on a property tax bill are not property taxes calculated from assessed value. Alameda County explains that special assessments are direct charges, with sewer service charges provided as one example.
Ownership Changes Can Trigger Reassessment
Buying or otherwise transferring property can result in a change in assessed value under California law. When a reassessment occurs, the new value can affect the regular property tax and may also produce a supplemental assessment covering the applicable portion of the fiscal year.
Supplemental Bills May Follow a Reassessment
A supplemental property tax bill is separate from the regular annual bill and can arise after a qualifying ownership change or completion of new construction. The supplemental amount reflects the difference created by the reassessment and the applicable period.
Why Alameda County Has Different Tax Districts and Local Rates
Alameda County contains a dense mix of cities, school districts, special districts, and other local agencies. Because individual parcels fall within different combinations of these jurisdictions, the total amount charged on a tax bill can vary even when two properties have comparable assessed values.
- Local tax districts fund services and obligations that apply to particular geographic areas within Alameda County.
- Tax-rate areas combine the taxing agencies and voter-approved charges applicable to an individual parcel.
- Neighboring properties can cross district boundaries, producing different total property tax bills.
- Voter-approved bonds can add charges used to finance qualifying public projects and indebtedness.
- Special assessments and direct charges may appear separately from the property-tax calculation based on assessed value.
- A parcel's exact location determines which agencies, districts, exemptions, and charges apply to its tax bill.
Check Property Tax Rates in Nearby California Counties
Comparing nearby counties can help buyers, owners, investors, and researchers understand how property-tax obligations differ across the Bay Area and surrounding California markets. California Property Checker provides county-specific property information so users can research local rates and property details by location.
Frequently Asked Questions
Will buying a home in Alameda County change its assessed value?
A qualifying change in ownership can trigger reassessment under California law. The property’s new assessed value can then become the basis for future property-tax calculations, subject to applicable rules and exclusions.
Why can my property tax bill be different from my neighbor's?
Properties can have different assessment histories, tax-rate areas, exemptions, bonds, and special assessments. A home’s current market value alone does not determine the exact amount shown on its annual Alameda County tax bill.
What happens if my property's market value falls?
California provides procedures for addressing situations in which taxable value may exceed the property’s applicable current market value. Property owners should review the Alameda County assessment information and follow the county’s applicable review or appeal process.
Can new construction create an additional property tax bill?
Yes. Completion of qualifying new construction can result in a supplemental assessment. Alameda County may issue a supplemental tax bill reflecting the reassessed value for the applicable portion of the fiscal year.
What are the regular Alameda County property tax payment deadlines?
Secured property taxes are generally paid in two installments. The first installment is due November 1 and becomes delinquent after December 10 at 5:00 p.m.; the second is due February 1 and becomes delinquent after April 10 at 5:00 p.m., subject to the county’s holiday and weekend rules.
What happens when property taxes become delinquent?
Unpaid secured taxes can result in penalties and additional costs. If the delinquent amount remains unpaid through June 30, further redemption penalties can accrue, and property can eventually become subject to the state’s tax-default process.
Are special assessments included in the property tax bill?
They can be. Alameda County states that special assessments are direct charges included in the total tax bill but are not property taxes based on the Assessor’s valuation. Sewer service charges are one example.
Can an exemption reduce the amount of property tax I owe?
Certain California property-tax exemptions can affect taxable value or the amount ultimately owed when eligibility requirements are met. Homeowners should verify current eligibility and application requirements with the appropriate Alameda County assessment authority.
Where can I verify the amount actually owed on my property?
The Alameda County Treasurer-Tax Collector provides property-tax information and payment services, including secured, supplemental, and unsecured property-tax information. Parcel or assessee information may be required to retrieve specific records.
Why is an estimated property tax calculation different from my actual bill?
An estimate normally applies a general effective rate to a property value, while an actual Alameda County bill reflects the property’s assessed value, tax-rate area, applicable levies, exemptions, and direct charges. The county’s actual tax bill is therefore the more precise figure for a specific parcel.