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July is Property Tax Assessment Time

If you pay property taxes in Alameda County, your assessment notice has been mailed or is on the way. Assessor Phong La reported last week that the 2023 Assessment Roll has been filed and notifications have been issued for all secured roll Alameda County property owners. The roll consists of approximately 470,046 real estate parcels and 58,424 business personal property accounts.

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If you have questions regarding your property assessment, call the Assessor’s Office at 510-272-3787. For business personal property assessments, call 510-272-3836. Formal appeals must be filed between July 2 and September 15, 2023. Information and appeal applications are available online at the Alameda County Clerk, Board of Supervisors Assessment web page.

Dates and deadlines

  • Mid-July: Annual mailing of assessment notices to all Alameda County real property owners stating the taxable value of the property.
  • August 31: Regular roll unsecured taxes due.
  • September 15: Filing deadline for Assessment Appeals. Must be filed in writing with the Clerk of the Board of Supervisors, Alameda County Administration Building, 1221 Oak St., Room 536, Oakland CA 94612.

The big numbers

This year’s total property roll value for Alameda County is $414,858,320,391—a 7.274% increase above last year. After applying exemptions equal to $14,954,026,518 in property tax savings for affordable housing, churches, schools, homeowners, disabled veterans, museums and more, the net total property roll value is $399,904,293,873—a 7.071% increase above last year.



The county also granted Proposition 8 property tax assessment reductions to 8,435 residential properties, 2,274 manufactured homes, and 121 commercial/industrial properties. Reductions ranged from 5% to 10% depending on the city and community for most homes purchased between January and October 2022.

Cities with the highest increases

  • The highest gross percentage increase over last year is the City of Newark with a 10.887% increase, equal to $1,433,039,188.
  • The second-highest percentage increase over last year is the City of Alameda with an 8.863% increase equal to $1,595,812,834.

Where does that tax money go?

Alameda County property taxes provide funding for public schools, hospitals, roads, police, fire and other services. Public schools receive the majority of the property taxes at almost 42%. The Assessment Roll reflects the total value of all real and business property in Alameda County as of January 1, 2023.

The county also offers a variety of ongoing financial and legal assistance for low-income homeowners, including down payment assistance for first-time homebuyers through AC Boost, Healthy Homes grants of up to $10,000 for lead paint repairs, and 1% interest renovation loans for low-income homeowners through RenewAC. Upcoming events include a free consultation with a lawyer at the Property Transfer Legal Clinic on July 21, August 18, or September 26, and a free Estate Planning Workshop on September 14.

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