Missed the Texas Property Tax Protest Deadline? Here's What to Do

If you missed the May 15 property tax protest deadline in Texas, the short answer is: you’ve lost your protest rights for this tax year. That’s the reality, and I won’t sugarcoat it. Texas Property Tax Code is clear — the deadline is the deadline.

But there are a few narrow exceptions, and there are steps you can take right now to minimize the damage and make sure this never happens again.

What You Actually Lost

Missing the protest deadline means you cannot challenge your property’s assessed value through the standard protest process for the current tax year. Whatever the appraisal district decided your commercial property is worth — that’s what you’re paying taxes on.

Here’s what that costs in real dollars:

Property Value	Effective Tax Rate	Annual Tax	If Overassessed 15%	Overpayment
$1,000,000	2.1%	$21,000	$17,850	$3,150
$3,000,000	2.1%	$63,000	$53,550	$9,450
$5,000,000	2.1%	$105,000	$89,250	$15,750
$10,000,000	2.1%	$210,000	$178,500	$31,500

A commercial property owner with a $5 million building who misses one year’s protest could be overpaying by $15,750 or more. And that’s a conservative estimate — in fast-growing counties like Collin County or Travis County, overassessments of 20-25% aren’t uncommon.

The Three Exceptions (They’re Narrow)

Texas law does provide a few limited paths to protest after the standard deadline. Don’t get too excited — these are genuinely narrow.

1. Good Cause Late Filing

Under Texas Property Tax Code Section 41.44(b), the Appraisal Review Board may accept a late protest if you can demonstrate “good cause” for missing the deadline. Good cause means something beyond your control prevented you from filing on time.

Examples that have been accepted:

• Hospitalization or serious medical emergency during the filing period
• Military deployment
• Natural disaster affecting your ability to file

Examples that will not work:

• “I forgot”
• “I was busy with my business”
• “I didn’t know about the deadline”
• “My accountant didn’t tell me”

The ARB has discretion here, and they use it sparingly. If you have a legitimate good-cause claim, file it immediately with your county appraisal district. Include documentation — hospital records, deployment orders, whatever supports your case. There’s no guarantee they’ll accept it, but it costs nothing to try.

2. Late-Mailed Notice

If your county appraisal district mailed your Notice of Appraised Value after April 15, your actual deadline extends to 30 days after the mailing date. Check the date printed on your notice — not the postmark, not the date you received it, but the date the district printed on the notice itself.

This isn’t really “missing” the deadline. It’s the deadline being later than May 15. But many property owners don’t realize this applies to them.

3. Post-Deadline Value Changes

If the appraisal district changes your assessed value after the protest deadline has passed — which can happen through supplemental appraisals or error corrections — you get a new 30-day window to protest that change specifically.

This is unusual but not unheard of, particularly when appraisal districts discover errors in their records or when new construction is completed and the property gets reappraised mid-cycle.

What to Do Right Now If You Missed It

Step 1: Confirm you actually missed it. Check the mailing date on your Notice of Appraised Value. If it was mailed after April 15, your deadline might be later than May 15. Count 30 days from that mailing date.

Step 2: File a good-cause petition if applicable. If you have a legitimate reason, submit it to your county’s ARB immediately. Worst case, they say no.

Step 3: Evaluate whether you have a Section 25.25 correction claim. Texas Property Tax Code Section 25.25 allows corrections to the appraisal roll for clerical errors, multiple appraisals of the same property, or properties included on the roll that don’t exist. This isn’t a substitute for a protest, but if the district made a factual error about your property (wrong square footage, wrong property classification, incorrect ownership), you can get that corrected outside the protest timeline.

Step 4: Set up your 2027 protest now. Put May 15, 2027 on your calendar today. Better yet, hire a consultant who handles filing as part of their service so you never have to think about the deadline again.

The Real Cost of Missing Multiple Years

Here’s what most commercial property owners don’t think about: missing the protest deadline doesn’t just cost you one year of overpayment. It compounds.

If the appraisal district overvalued your property by 15% and you don’t protest, that inflated value becomes the baseline for next year’s appraisal. The district might increase it another 5-10% the following year on top of the already-inflated number. Two years of missed protests can put you 20-25% above where your value should be.

I’ve worked with commercial property owners who came to us after missing two or three years of protests. The first protest often results in a 20-30% reduction because the overassessment has been building. That’s money they can never recover for the years they didn’t file.

What a Multi-Year Protest Strategy Looks Like

If you’ve been missing protests for multiple years, the first year back in the process is often the most impactful. Uncontested overassessments compound — the inflated value becomes the baseline for the following year’s increase, so the gap between what you should be paying and what you’re actually paying grows over time.

When we take on properties that haven’t been protested in two or three years, the first hearing typically yields the largest reduction. You can’t recover the prior years’ overpayments, but you can stop the bleeding immediately and set a much lower baseline going forward.

The evidence strategy for a multi-year protest is no different from a standard protest:

• Comparable sales of similar properties that support a lower market value
• Income analysis using your actual rents, vacancy, and expenses compared to the district’s inflated assumptions
• Equity comparisons showing the district assessed your property at a higher ratio than comparable buildings nearby

The case is the same. The difference is that you may be coming in from a higher starting point, which means the potential reduction is larger.

Which Counties Are Most Aggressive on Commercial Values

Not all Texas counties treat commercial property the same way. Understanding where your property sits in terms of appraisal district aggressiveness helps calibrate how urgently you need to act.

Harris County (HCAD): One of the most actively managed appraisal districts in the state. Commercial values in Houston have increased significantly over the past four years, particularly in industrial and multifamily sectors. HCAD has the resources to build detailed comparable databases and uses them.

Travis County (TCAD): Austin’s explosive growth from 2020–2024 drove commercial values to levels that still don’t reflect the cooled post-2024 market. TCAD is still working off elevated comparable sales that may not represent current conditions.

Collin County (CCAD): McKinney, Frisco, and Allen are among the fastest-growing commercial markets in the state. CCAD’s commercial values have chased that growth aggressively.

Dallas County (DCAD): Commercial office values are under real pressure in Dallas due to vacancy rates that continue to run above historical norms. DCAD’s market value estimates for office don’t always reflect actual conditions.

If your property is in one of these counties, the argument for professional representation is stronger. These districts are sophisticated and respond to evidence-based cases presented by consultants who have ongoing relationships with their appraisers.

How to Make Sure You Never Miss It Again

The simplest solution: build the protest into your annual business calendar. Diary the week your notice typically arrives, review it as soon as it lands, and file Form 50-132 immediately — filing preserves your rights even while you finish assembling evidence.

If you prefer to handle it yourself going forward:

• Set a recurring calendar reminder for April 1 every year — not May 15. Give yourself six weeks of buffer.
• Bookmark your county CAD’s online filing portal and confirm it works before protest season.
• File the moment you receive your Notice of Appraised Value. Don’t sit on it.

The protest deadline is one of those things where being a few days late costs you real money for a full year. Set up your 2027 protest now so you don’t lose another dollar, or read our full guide on how the Texas protest process works.