Supplemental tax bills are typically issued within a few months after the property sale or completion of construction. However, the exact timing can vary. Websearch secured, supplemental and prior year delinquent property taxes : Secured tax bills are payable online from 10/4/2023 to 9/1/2024. Most supplemental tax bills are. Weba supplemental tax bill reflects any increase in property tax generated by a supplemental “event” (change in ownership or new construction). Webin alameda county, supplemental taxes come into play when there’s a reassessment of property value triggered by changes such as new ownership, significant. If the tax rate in your community has been established at 1. 20% (1% base rate plus. 20% for prior indebtedness) the property tax would be calculated as. Websearch secured, supplemental and prior year delinquent property taxes : Secured tax bills are payable online from 10/4/2023 to 7/1/2024. Webyou 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.