County of Los Angeles Assessment Appeals Board

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Annual Property Tax Bill	Local tax assessed on real estate property. Mailed each year on or before November 1st and identify the taxes due on the 1st and 2nd installment as well as the total taxes due.
Supplemental Property Tax Bill	Additional secured tax generated due to a change in ownership or completion of new construction. This is sent in addition to the annual tax bill.
Unsecured Property Tax Bill	Properties that can be relocated and is not real estate, such as business equipment, equipment, fixtures, boats or airplanes. This is mailed out every year no later than July 31st and are due no later than August 31st.
Adjusted Property Tax Bill	Results in either a decrease or an increase in the total tax due, and are mailed at any time during the year, therefore due dates vary.

Annual Tax Bill

Supplemental Tax Bill

Unsecured Tax Bill

Adjusted Tax Bill (Roll Change/ Escape Assessment/ Penalty Assessment)

Required: To login, you will need information from your property tax bill.

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Deadline for 2024 Regular Assessment filing ends December 2, 2024 at 12 midnight PST.

Welcome to the Los Angeles County
Assessment Appeals Board
Online Filing and Tax Agent Registration Website

On August 31, 2021, the Board of Supervisors approved an amendment to LA County Code Title 2 establishing a $46 non-refundable filing fee for assessment appeal applications. Effective October 1, 2021, the fee must be paid when submitting an application. Please click here to read more.

If paying the fee would cause undue financial hardship, you may request a fee waiver. Waiver forms must be submitted online, in the mail, or in-person along with your application. Hardcopy versions are available at bos.lacounty.gov/Services/Assessment-Appeals or from Room B4 at the Kenneth Hahn Hall of Administration.

To file for an Assessment Appeals application online, click on the "Applicant Login".

Instructions - How to Complete an online Assessment Appeals Application (AAB-100)

To submit your application via mail or in-person, click on "Forms" to access and download the printable Assessment Appeals application form (AAB-100).

Notice to Tax Agents

Pursuant to Los Angeles County Code Chapter 2.165, no tax agent shall represent taxpayers before a County official without first being registered.

For more information on the Tax Agent Registration Program, including program requirements, ordinance, frequently asked questions, or registration instructions, click here.

To submit your application via mail or in-person, click on "Forms" to access and download the printable Assessment Appeals application form (AAB-100).

To file online online, click on the "Tax Agent Login". You must be a registered tax agent in order to file for an online application.

For instructions on how to register, click here.

For instructions on how to renew your annual registration, click here.

For instructions on how to submit your campaign contribution report, click here.

Pursuant to State Board of Equalization Property Tax Rule 305 Section (a)(1) and Los Angeles County Assessment Appeals Board Rule Section 4(A)(2)(d), for application(s) filed by an agent (other than a California licensed attorney who has been directly retained and authorized by the person affected to file the application), the applicant's written authorization must be properly indicated on the application or attached with each application at the time of filing.

For instructions on how to submit an online application, including upload/attachment of Agent's Authorization, click here.

Types of Assessments and Filing Periods

TYPE OF ASSESSMENT	FILING PERIOD
Regular Assessments	Filing dates are *July 2 to November 30,** of each year for all real and personal property assessments.
Supplemental Assessments	Filing dates are within 60 days of the mailing date printed on the Supplemental notice or tax bill, or the postmark date of the notice or tax bill, whichever is later.
Roll Change/Adjusted and Escape Assessments	Filing dates are within 60 days of the mailing date printed on the notice or adjusted/escape assessment tax bill, or the postmark date of the notice or tax bill, whichever is later.
Misfortune Calamity Reassessments	Filing dates are within six months after the mailing date of the proposed reassessment notice.

*Please Note: If the final filing date falls on a Saturday, Sunday, or a legal holiday, an application that is mailed and postmarked on the next business day shall be deemed to have been filed timely.