Evidence for a California Assessment Appeal

California’s evidence rules are set out by the Board of Equalization and they are stricter than most owners expect. Three of them decide appeals before the value is even discussed.

Rule 1: only what you present at the hearing counts

The board may consider only the evidence you and the assessor present at the hearing. Documents you previously sent the assessor, or that the assessor previously sent you, or anything you attached to your application, are not considered unless it is also presented at the hearing. Practically: send the assessor your evidence to encourage agreement, then bring it to the hearing and present it again.

Rule 2: comparable sales have a time boundary

Sales may be from any time before the valuation date, and the closest in time are the best indicators of value — but an appeals board may not consider comparable sales that occurred more than 90 days after the date your value was set by the county assessor. A market that fell after the lien date is therefore not, by itself, evidence about the lien date value. That is a genuinely different posture from Texas, where the protest is about the value on January 1 too, but the comparable-selection discussion is framed around what the review board will consider rather than a stated time boundary.

Rule 3: the exchange of information narrows the hearing

Regardless of the value of the property, you may request an exchange of information with the assessor: the request must be made at least 30 days before the hearing and must include your opinion of value and the data supporting it; the other party must respond at least 15 days before the hearing with the same. If the assessed value is more than $100,000, the assessor may also request the exchange from you. Once an exchange has happened, the hearing evidence is largely restricted to what was exchanged.

Who has to prove what

This is the part owners most often get backwards. The assessor carries the burden of proving its opinion of value is correct in these situations:

• an appeal of a single-family dwelling occupied by the owner as a primary residence;
• non-enrollment of purchase prices, if you timely filed a Change in Ownership Statement;
• the assessor asking to enrol a higher value than the roll shows;
• escape assessments not caused by your failure to file a Change in Ownership Statement, business property statement or new-construction permits;
• penalty assessments.

In all other situations — including a vacation or secondary home — the applicant has the burden and must be the first to present evidence. Knowing which side of that line you are on changes both your preparation and the order of the hearing.

Kinds of evidence the board may hear

• Comparable sales — the BOE calls this the best supporting documentation for a residential property. Your assessor may publish sales information for properties sold in the last two years, and it is also available in person; title companies and real estate agents are commonly used sources.
• An appraisal or other written report — submitted in writing, though the county board may require the person who prepared it to attend the hearing to answer questions.
• Testimony — from you, your agent or attorney, the assessor’s staff, or an expert or other witness.
• A valuation approach — any relevant evidence admitted under customary appraisal practice is admissible; the income and replacement-cost approaches may be used where they are the most appropriate method for the property.

Depositions are not admissible and will not be considered by the appeals board.

Worked example (illustrative)

Illustrative preparation sequence, not a prediction of any outcome.

1. Collect: three to five closed sales of genuinely similar homes, dated on or before the lien date, with the data that makes them comparable (location, size, age, condition, date of sale).
2. Check the window: exclude any sale that closed more than 90 days after the valuation date — it may not be considered.
3. Request the exchange: at least 30 days before the hearing, with your opinion of value and your data, forcing the assessor to state its opinion and its data 15 days before.
4. Re-present at the hearing: everything you want considered, even if you already sent it — including anything you attached to the application.

What this tells you: a strong California appeal is built on date-appropriate comparables, presented in person, exchanged properly.

What it does not tell you: what your property is worth, whether the assessor’s adjustment methodology is wrong, or whether the board will accept your comparables as genuinely similar. Those are judgments made on the record at the hearing.

Where to go next

• The application for changed assessment — filing, the board’s powers, and judicial review.
• How comparable properties work — a general guide to selecting and presenting comparables.
• California deadlines — including the 30/15-day exchange dates.