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The Alameda County Assessor is pleased to announce that the AC Property App is now available on Android devices as well as Apple devices. You can lookup your assessed value, property taxes, and parcel map. You can even pay your property taxes right from the app. Download it from Google Play or the iTunes store.
General & Ownership Information
Business Personal Property:
Our business hours are from 8:30AM to 5:00PM Monday through Friday except for holidays
When the Assessor's Office reappraises your property due to a change in ownership or completion of new construction, you will be notified by mail of the new assessed value. This notification is known as a “Notice of Supplemental Assessment.” If the new value (Base Year Value) is greater than the taxable value on the roll, the supplemental assessment will result in a bill. The supplemental tax bill is issued only on the added value, and unlike the regular tax bill which covers the entire fiscal year (July through June), the supplemental bill is prorated to cover the period from the date of ownership change or completion of new construction to the end of the fiscal year.
It is important to understand that supplemental tax bills are in addition to the regular annual tax bill (that is, supplemental to) and as required by law, are mailed directly to the owner of the property. Unlike the annual property tax bills that are mailed in October, lenders do not receive the supplemental tax bill. These bills are the responsibility of the owner even if the regular annual property taxes are normally paid by a lender through an impound account.
Supplemental Tax Estimator
To estimate what your supplemental taxes might be, click here.