Appeal a supplemental assessment in Los Angeles County

Yes — you can appeal a supplemental assessment in Los Angeles County if you believe the county assigned too high a value after a sale or new construction. The window to act is short and specific to the supplemental notice, so read that notice immediately for the “date of change” and the mailing date. If the assessor’s supplemental taxable value exceeds your documented sale price, closing statement, recorded deed, or the actual cost/extent of construction, you have the core evidence needed to challenge it. This article explains who can file, the deadlines and how they differ from regular roll appeals, the exact forms and documents to gather, what happens at the Assessor review and the Assessment Appeals Board (AAB) hearing, and a practical checklist from receiving the bill through final disposition.

1. Can I appeal my supplemental assessment right now?

Yes—if you received a supplemental assessment notice and you believe the reassessed value is too high, you can appeal. Who can file: the owner of record on the date of change shown on the notice or anyone with a legal interest in the property (for example, a buyer listed on the recorded deed or the party legally responsible for taxes). Common valid reasons to appeal: - Sale price lower than the supplemental assessed value: if you bought the property and the supplemental assessment exceeds the purchase price after allowable adjustments, that’s a primary basis for appeal. - New construction overstated or mischaracterized: if additions or conversions weren’t built as recorded, were smaller, or included non-taxable items, you can challenge the assessment. - Clerical or factual errors: incorrect square footage, wrong parcel, wrong owner, duplicated improvements, or errors in the recorded deed. - Overvaluation: the assessor used comparables or methods that clearly overstate market value for the date of change. How to check quickly: compare the supplemental notice’s “date of change,” the taxable value assigned to that change, and your sale documents or construction records. If the value assigned to the change is higher than your actual purchase price or the reasonable market value of the work completed, you likely have grounds. Practical notes and common misunderstandings: - A supplemental bill is appealable but only within its short filing window — don’t assume it’s final. - Both buyers and sellers can have standing for parts of a supplemental assessment if the assessment covers periods each owned the property; use the recorded deed and the date of change to determine who should file. - Confirm who the county lists as owner by using the assessor’s parcel number on the bill and the recorded deed.

2. What are the deadlines and how is this different from a regular assessment appeal?

Supplemental appeals follow much shorter deadlines than regular annual roll appeals. Key differences: - Regular roll appeals challenge values set for the January 1 lien date and use the county’s annual filing window (often early July through mid-September in many California counties). - Supplemental appeals challenge a change in value that can happen any time during the year and have a separate, shorter deadline tied to the supplemental notice’s mailing date or date of change. What to watch on your notice: find the “date of change” and the mailing date; the notice usually states the appeal period. Many counties give 60 days from the mailing date to file, while others measure from the date of change — treat the notice’s stated deadline as controlling. Example: if you closed on March 15 and the supplemental notice was mailed June 10, a 60-day period from mailing typically means you must file by August 9. Practical pitfalls: - Don’t confuse the supplemental deadline with the regular roll deadline; they’re separate. - Don’t wait for the informal review to finish before filing a formal appeal: an informal review does not extend the filing deadline. - If the notice gives a specific “appeal by” date, act on that date and verify county rules on the LA County AAB website.

3. What forms and evidence do I need to file an appeal in Los Angeles County?

Los Angeles County generally uses a two-step approach: an optional Assessor informal review, then a formal Assessment Appeals Board (AAB) application if necessary. Forms and where to get them: - Assessor informal review: use the Assessor’s informal review or reconsideration request form on the Los Angeles County Assessor’s website or call the Assessor’s office for instructions. This review is usually free. - Formal appeal: complete the Los Angeles County Assessment Appeals Board Application (sometimes called Application for Changed Assessment). Obtain it from the LA County AAB web page or the clerk’s office. Required documents and recommended evidence: - Recorded deed/grant deed showing the transfer date and parties. - Purchase contract and closing statement (HUD-1 or Closing Disclosure) showing sale price and any seller concessions. - The original supplemental notice (to show mailing date and date of change). - Photographs showing property condition at transfer or after construction. - Contractor invoices, permits, completion certificates, and receipts for new construction work. - Comparable sales (3–5 comps) with sale dates close to the date of change, MLS sheets or public records printouts. - Appraisal reports dated for the date of change, if you have them. - A one-page cover letter that summarizes the dispute and the value reduction you seek. How to prepare the packet: create a single organized PDF or a printed packet with a table of contents and clearly labeled exhibits (Exhibit A: deed; Exhibit B: contract; Exhibit C: comps). Highlight the exact lines that show sale price, closing date, and invoice totals. Fees and filing strategy: - Check the Los Angeles County AAB site for the current filing fee and accepted payment methods — fees can apply for formal AAB filings. - Keep originals and submit copies; bring originals to the hearing in case the board asks to inspect them. - If you’re short on time, file the AAB application before the deadline with at least the deed and purchase contract attached to preserve your hearing right, then submit the full packet as soon as possible.

4. What happens at the Assessor review and the Assessment Appeals Board hearing?

Two main stages follow filing: an informal Assessor review and, if unresolved, a formal AAB hearing. Assessor informal review: - The Assessor’s appraiser reviews documents you submit (sale price, deed, square footage, construction records). - This step is often faster and can correct clerical errors or accept an undisputed sale price, producing a revised supplemental bill. - Expect email or phone contact and requests for additional documents; get the reviewer’s name and file number. - An informal agreement produces a revised bill in writing; if the Assessor does not adjust the value, you still retain the right to file with the AAB. Assessment Appeals Board hearing: - After you file the AAB application and the filing period closes, hearings are scheduled — often several weeks to months later, depending on backlog. - A hearing officer or a board panel presides. You present your case first, then the county appraiser presents the assessor’s valuation. - Evidence is admitted and witnesses may testify (buyer, agent, appraiser, contractor). Each side can question the other. What the board evaluates: market value as of the date of change, the relevance and reliability of comparable sales, the credibility of appraisals and invoices, and whether the assessor used appropriate valuation methods. Evidence that commonly succeeds: - Recorded deed and purchase contract/closing disclosure showing the sale price. - Contractor invoices, permits and completion certificates for new construction that limit assessed value to actual completed work. - Comparable sales close in time and location to the date of change. Typical outcomes: - Full reduction to the value you claimed, which produces a corrected bill and possible refund or credit. - Partial reduction. The board may set a lower value that is between the assessor’s number and your requested figure. - No change: the board upholds the assessor’s valuation. After a decision: the county issues a corrected supplemental bill and handles refunds or credits per tax-collector procedures if you overpaid. If you lose, further judicial review is possible but limited, costly, and slow.

5. Step-by-step checklist to file, follow up, and protect your refund or tax bill rights

• Day 0: Open the supplemental notice. Note the “date of change,” the mailing date, and any stated appeal deadline. Put those dates on your calendar and set reminders. - Day 1–7: Call the Los Angeles County Assessor’s office to request an informal review. Ask for the reviewer’s name and the Assessor file number. - Gather documents: recorded deed, purchase contract and closing disclosure, photos of property condition at transfer, contractor invoices and permits (if construction), and at least three comparable sales near the date of change. - Prepare an evidence packet: table of contents, labeled exhibits, and a one-page cover letter summarizing the error and the value you seek. Make digital and printed copies. - If the assessor’s informal review resolves it: get the agreement in writing and keep the revised bill. - If unresolved: file the AAB application before the supplemental appeal deadline. Attach at least the deed and purchase contract. Pay any filing fee and get a stamped receipt. - After filing: submit the full evidence packet to the clerk and to the Assessor’s office as instructed. Track your case number and confirm the hearing date. - Before the hearing: prepare a concise presentation that shows the date of change, why the assessor’s value is incorrect, and the strongest evidence (sale price, comps, invoices). Line up witnesses only if they add clear, date-specific facts. - At the hearing: be punctual, professional, focused, and brief. Bring originals and copies of exhibits and limit testimony to the strongest points. - After the decision: if you win, confirm the county issues a corrected bill and processes any refund. If you lose, read the decision for appeal options and deadlines; further appeals are limited. Common mistakes to avoid: - Missing the filing deadline — missing it usually forfeits your rights. - Relying only on phone calls — follow up in writing. - Submitting disorganized evidence — the board responds better to clear, dated, and comparable documentation. - Assuming informal review extends deadlines — it does not.

Conclusion

First step: read the supplemental notice, note the date of change and the mailing date, and immediately contact the Assessor’s office for an informal review. If the assessor won’t correct the value, file the Los Angeles County Assessment Appeals Board application before the notice deadline and attach your deed and purchase contract to preserve your right to a hearing. Don’t wait for the annual roll cycle — supplemental assessments run on their own timetable. A successful result is either a corrected supplemental bill that matches your documented sale price or a reduced assessed value that yields a refund or smaller tax bill for the supplemental period.

Frequently Asked Questions

Can the seller and the buyer both appeal the same supplemental assessment?

Only people with legal interest at the time the assessment applies can appeal. If the supplemental assessment covers periods that include both the seller’s and buyer’s ownership, each may have standing for the portion that applies to them. Use the recorded deed and the assessment’s date of change to determine who should file.

Will an informal Assessor review stop the appeal deadline?

No. An informal review does not extend the filing deadline. If you want a formal hearing, file the AAB application before the supplemental deadline to preserve your right, even while pursuing the informal review.

What evidence most often wins a supplemental appeal?

Clear, dated documents tied to the date of change: the recorded deed, purchase contract/closing disclosure showing the sale price, contractor invoices and permits for new construction, and comparable sales close to the date of change. A concise, organized packet is more persuasive than scattered materials.

If I overpaid the supplemental tax before the appeal finishes, can I get a refund?

If the board later reduces the assessed value for the supplemental period, the county typically issues a refund or credit for any overpaid taxes. Keep payment records and the AAB decision; the county tax collector processes refunds according to its procedures.

Where do I find the correct forms and current filing fees for Los Angeles County?

Get application forms and fee information from the Los Angeles County Assessment Appeals Board and the Los Angeles County Assessor’s official websites or by calling their offices. County web pages list application forms, filing instructions, and fee updates.