Improvements to your home that increase its value most often require an inspection by the Assessor and subsequent increase in assessment. The increase is administered in the form of an Added Assessment Tax Bill, which you will receive in the mail at the end of October. Payment is due on November 1. The Added Assessment bill will be mailed to your mortgage holder, if you have one, and you will receive an advice only copy. The Added Assessment amount will be reflected in your regular assessment for the following tax year.