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Aircraft Property Returns need to be filed every year. The due date for filing aircraft data and flight logs is May 7, the same date that most personal property returns are due in counties in the state of California.

When it comes to filing an appeal on your aircraft’s assessed value, depending upon in which county your property is located, there 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.


Our firm has represented thousands of taxpayers ranging in size from multi-billion dollar corporations to private individuals. As a result of our expertise and broad range of experience, we have obtained millions of dollars in refunds and tax savings for our clients. Assessment Counselling Services represents a diverse cross section of the business community throughout the state of California.