Generally, the estate tax return is due nine months after the date of death. A six month extension is available if requested prior to the due date.Understand what you need to do to file an estate income tax return and how to get an Employee Identification Number. You'll be glad you did. A. Yes, all property owners in Oakland who wish to rent out their property must file and pay the initial Registration Fee to obtain a business tax certificate. Welcome to the Alameda County Treasurer-Tax Collector's website. Our staff has worked hard to provide you with online services that provide useful information. The Tax Assessment office is responsible for establishing and maintaining the assessed value for all real estate within the Borough. The tax is due upon sale or transfer of an interest of real property and is payable at the time of recordation with the Alameda County Recorder.