What Is an Evidence Discovery Letter — and Why It Changes Your Hearing

The Asymmetry Problem

When you walk into an Appraisal Review Board hearing, the McLennan Central Appraisal District (MCAD) appraiser sitting across from you has a file on your property. That file contains the data they used to arrive at your appraised value — the comparable sales they selected, the adjustments they made, the methodology they applied.

You, by default, have none of that. You are being asked to challenge a number without knowing how that number was built.

That is the asymmetry. And Texas law gives you a tool to close it.

What Texas Law Requires

Texas Tax Code requires the appraisal district to provide you with copies of any evidence they intend to use at your hearing — if you ask for it in advance. The request must be made in writing, at least 14 days before your scheduled hearing date.

Once you submit that written request, MCAD is obligated to send you their evidence package. If they fail to do so, they are barred from using that evidence at the hearing. The panel cannot consider data that was not disclosed to you in advance.

That is not a loophole. That is the law, and it is designed specifically to protect property owners from being ambushed with evidence they have no opportunity to rebut.

What an Evidence Discovery Letter Is

An Evidence Discovery Letter is the written request that triggers this disclosure obligation. It formally notifies MCAD that you are invoking your right to receive their evidence package before the hearing.

A properly drafted letter includes your property account number, the scheduled hearing date, a clear statement of the request, and the statutory basis for it. It should be sent in a way that creates a record — certified mail, email with read receipt, or through the online protest portal if one is available.

The letter itself is not complicated. What matters is that it is sent, it is sent on time, and it references the correct statutory authority so MCAD cannot claim ignorance of the obligation.

What You Get Back

When MCAD responds to a properly submitted discovery request, they are required to send you the evidence they intend to present. This typically includes:

• Their comparable sales selection and the adjustments applied to each comp
• Any mass appraisal data or CAMA model outputs they used
• Property characteristic data they have on file for your home
• Any other documentation they plan to present to the ARB panel

This is valuable for two reasons. First, it lets you review their comps before the hearing and identify weaknesses — properties that are not truly comparable, adjustments that are inconsistent, or data errors about your home's characteristics. Second, it signals to MCAD that you are a prepared, informed protestor. That alone changes the dynamic at the informal hearing stage.

The Strategic Value

Appraisal district appraisers handle hundreds of protests. Most protestors show up without evidence, make an emotional argument, and leave with nothing. When an appraiser sees that a homeowner has submitted a formal discovery request, has a prepared evidence packet, and knows the statutory framework — they treat that protest differently.

This is not about intimidation. It is about demonstrating that you understand the process well enough to use it correctly. That credibility translates directly into better informal settlement offers and more receptive ARB panels.

What Happens If MCAD Does Not Respond

If you submit a timely, properly formatted discovery request and MCAD does not provide their evidence at least 14 days before the hearing, you have a significant procedural advantage. At the hearing, you can object to any evidence they attempt to introduce on the grounds that it was not disclosed as required.

The ARB panel is required to sustain that objection. Evidence that was not disclosed cannot be used. This means MCAD may be left presenting their valuation without the supporting data — a position that is very difficult to defend before the panel.

The Parity Approach

Every Arsenal package from Parity Tax Engine includes a pre-drafted Evidence Discovery Letter specific to your property and hearing date. You do not need to research the statute, draft the letter, or figure out where to send it. It is included in your packet, ready to submit.

Combined with the Market Alignment Study and the comp-based demand value, the Evidence Discovery Letter is one of three tools that turns an ordinary protest into a hearing where the odds are genuinely in your favor.