How to Appeal Property Taxes in Los Angeles County, California (2026 Guide)

For Los Angeles County’s 2026 regular assessment roll, file your formal assessment appeal with the Los Angeles County Assessment Appeals Board between July 2 and November 30, 2026; the online portal states the 2026 regular-assessment deadline ends November 30, 2026 at 12 midnight PST. File online at the County AAB portal, or mail/walk in Form AAB-100 / BOE-305-AH, Assessment Appeal Application to 500 W. Temple St., Room B4, Los Angeles, CA 90012 with the $46 nonrefundable filing fee or a fee-waiver request.

How assessments work in Los Angeles County

Los Angeles County’s 2026 appeal season is about the value placed on the roll for the 2026 assessment year. For a regular “decline in value” appeal, the valuation date is January 1, 2026. The county’s regular filing period is July 2 through November 30 each year; if the last day falls on a weekend or legal holiday, a mailed application postmarked the next business day is treated as timely. In 2026, November 30 is the actual deadline.

The Assessor sets assessed values; the Auditor-Controller applies the general 1% levy plus voter-approved debt rates and direct assessments; the Treasurer and Tax Collector bills and collects. The Assessment Appeals Board is separate from the Assessor and can decrease, increase, or leave your assessed value unchanged.

Under Proposition 13, most homes are assessed from a “base year value” set when you bought the property or completed new construction, with annual increases capped at 2% until another reassessable event occurs. A different rule, often called Proposition 8 or “decline in value,” requires the Assessor to enroll the lower of your factored Prop. 13 value or market value as of January 1. That type of reduction is temporary and must be reviewed yearly; if the market recovers, the value can rise faster than 2% until it reaches the factored Prop. 13 value.

A new purchase, inheritance, transfer, addition, ADU, pool, or major remodel can trigger a supplemental or base-year assessment. If you disagree with a supplemental assessment, the deadline is usually within 60 days of the mailing date printed on the supplemental notice or tax bill, or the postmark date, whichever is later.

Whether you should appeal

Appeal when you can point to a number, not just a feeling. For a 2026 decline-in-value appeal, your evidence should show that your home’s market value on January 1, 2026 was below the roll value. Strong evidence is usually three to five comparable closed sales near your valuation date, adjusted for differences such as location, lot size, square footage, condition, view, ADU status, and date of sale. The State Board of Equalization says comparable sales are typically those close to January 1 and no later than March 31.

Check your Assessor’s Parcel Number, assessed land value, improvement value, tax rate area, and exemption status on the LA County Assessor portal before filing. If the assessed value is already far below market because you bought years ago, an appeal probably will not help. If you purchased in late 2025 at $850,000 but the roll shows $950,000, or if similar nearby homes sold around January 1, 2026 for less than your enrolled value, an appeal is worth considering.

Do not rely on unpublished “success rates.” I did not find an official Los Angeles County publication giving current homeowner appeal success rates or median reductions. Treat any third-party win-rate claims cautiously; the Board decides parcel by parcel based on evidence.

Also check exemptions. The Homeowners’ Exemption reduces taxable value by $7,000 for an owner-occupied principal residence, roughly $70 per year at the 1% base rate. Disabled veterans may qualify for much larger LA County exemptions: the Assessor’s 2026 figures list a $180,671 standard exemption and $271,009 low-income exemption, subject to eligibility and filing rules.

Step-by-step how to file

1. Decide what you are appealing. Most homeowners choose “Regular Assessment – Decline in Value” for a one-year market drop, or “Supplemental Assessment” / “Change in Ownership” / “New Construction” for a purchase or construction reassessment.

2. Try the Assessor first, but do not miss the Board deadline. LA County has a decline-in-value review system, and the Assessor can correct errors informally. But an informal review is not the same as a formal Assessment Appeals Board filing and does not extend the November 30 deadline.

3. Use the correct form. The official form is Assessment Appeal Application, Form AAB-100, which is LA County’s version of BOE-305-AH. The county also has AAB-101 Economic Unit Form if contiguous parcels are treated as one appraisal unit, agent authorization forms if someone files for you, and a fee waiver form.

4. Enter both values. Column A is the value on the roll. Column B is your opinion of value. Do not leave your opinion blank; the form warns that failure to state an opinion of value can cause rejection.

5. Do not attach all hearing evidence to the application. The AAB-100 instructions say hearing evidence is presented at the hearing. Keep your comps, appraisal, photos, repair estimates, and adjustment notes organized for later upload or exchange.

6. File by an accepted method. LA County’s official methods are:

   • Online: LA County AAB portal at lacaab.lacounty.gov. You need tax bill information, including the Assessor ID and PIN.
   • Mail: Los Angeles County Assessment Appeals Board, 500 W. Temple St., Room B4, Los Angeles, CA 90012.
   • In person: Room B4, Kenneth Hahn Hall of Administration, same address.
   • Email: LA County publishes AABOffice@bos.lacounty.gov for questions/contact, but I found no official county instruction allowing initial appeal applications to be filed by email. Use the portal, mail, or walk-in unless the AAB tells you otherwise in writing.

7. Pay the fee. The filing fee is $46 per application, nonrefundable. If payment would cause undue hardship, submit the county fee-waiver form with the application. If you request written findings of fact for possible court review, that is separate and costs at least $492 per parcel and issue.

What happens after

After filing, the Assessor may review your evidence and sometimes stipulate to a lower value before hearing. If not, the AAB schedules a hearing. LA County offers virtual and in-person Assessment Appeals Board hearings, Monday through Friday starting at 8:30 a.m.; in-person hearings are at Room B4, Kenneth Hahn Hall of Administration, 500 W. Temple St. Hearing Officer hearings are conducted virtually.

A hearing is less formal than court but still evidence-based. You or your agent explains your value, the Assessor explains theirs, both sides may question evidence, and the Board or Hearing Officer decides the taxable value. For an owner-occupied single-family dwelling, LA County rules place a rebuttable burden-of-proof advantage on the taxpayer if you supplied required information to the Assessor.

You may request the Assessment Hearing Officer Program for a single-family home, condo, cooperative, or 2–4 unit dwelling, or property not exceeding $5 million assessed value. A hearing officer prepares a report and recommendation; either side can ask for a full board hearing within 14 days. The Board generally must hear and decide an application within two years of filing unless there is a valid extension or exception. You still must pay your tax bill on time while the appeal is pending; if you win and designated the application as a refund claim, the county can process the refund.

Local tips

Use the correct tax rate in your savings estimate. LA County’s exact rate depends on your Tax Rate Area (TRA), shown on your bill and searchable through the Auditor-Controller. The county guide says most LA County total rates do not exceed 1.25%, so use your TRA rate for precision and 1.25% only as a planning benchmark.

Example: your 2026 roll value is $900,000, but three January-area comps support $820,000. A successful reduction is $80,000. At a 1.25% LA County planning rate, annual tax savings are $1,000. After the $46 filing fee, first-year net savings are about $954. Direct assessments, parcel taxes, Mello-Roos charges, and fixed charges usually do not fall just because the assessed value is reduced.

Build your evidence around January 1, not today’s listing prices. A June 2026 Zillow estimate is weaker than closed comparable sales bracketing January 1, 2026. If your argument is condition, bring dated photos, contractor bids, permit records, insurance documents, or inspection reports showing the condition existed on the lien date.

Finally, do not confuse tax relief programs with appeals. The AAB cannot grant or deny exemptions and cannot change tax rates or waive late-payment penalties. File exemption claims with the Assessor, appeal values with the AAB, and pay bills with the Treasurer and Tax Collector.