Depending upon in which county your property is located, it could be one of two deadlines, either September 15th or November 30th. Los Angeles County as well as the overwhelming majority of the 58 counties in California has the November 30th deadline.
If you received a Supplemental, Escape or Adjusted assessment notice, the deadline to file is typically 60 days from the DATE OF THE NOTICE. There are exceptions for some counties, including Los Angeles County whereby you have 60 days from the date of mailing of the tax bill. Each county has different rules. We advise that should you receive a Notice of Value Change in the mail you act on it in a timely manner.