How to Protest Commercial Property Taxes in Texas (2026 Owner's Guide)

If you own office, retail, industrial, or multifamily property in Texas, your tax bill isn't built the way a homeowner's is. The appraisal district values your property on its income — and a single wrong assumption about your rent, vacancy, or cap rate can inflate your assessed value by hundreds of thousands of dollars. This guide shows you exactly how that happens, and how to fight it.

01 Why commercial protests are different

A homeowner protests on comparable sales: what did the house down the street sell for. Commercial is a different discipline entirely. Texas appraisal districts value income-producing property primarily on what it earns — and they do it with mass-appraisal models that apply blanket assumptions across an entire class of buildings, whether or not those assumptions match your actual rent roll.

That makes commercial protests more technical and more document-heavy — rent rolls, operating statements, and lease data aren't optional, they're the case. But it also creates the opening: a model built on assumptions is a model you can dismantle with facts.

02 How the district values your property

Districts use three approaches to value, but for income property the income approach almost always drives the number. It works on a deceptively simple formula:

The trap is that the district doesn't know your real numbers. It estimates them. And it tends to estimate in the direction that produces a higher value.

03 The income approach, with real math

Here's where most guides stop. Let's actually run it. Say you own a 50,000 SF flex building:

That's a $2.1 million gap — and at a 2.1% combined tax rate, roughly $44,000 a year in overpayment, created entirely by four assumptions that didn't match your building. Every one of those four inputs is an argument.

04 Where districts inflate the number

In our experience the over-assessment almost always hides in one of four places:

• Market rent set too high. The district assumes your space leases at top-of-market rates it pulled from a broad class — not what your actual leases say.
• Vacancy assumed too low. Mass models often assume a building is nearly full at market rents. Your real vacancy and collection loss tell a different story.
• Expenses understated. Lower assumed expenses inflate NOI. Your actual operating statement, including non-recoverables, brings it back to earth.
• Cap rate set too low. A lower cap rate produces a higher value. Real market transactions often support a higher cap rate than the district applied.

Correct any one and the value moves. Correct all four with documentation and the case becomes very hard for a panel to dismiss.

05 Unequal appraisal — your second weapon

Even if the income approach lands on a "fair" value, Texas law gives you a second, independent argument. Under Tax Code §41.43(b), you're entitled to be assessed at no more than the median appraised value of a reasonable number of comparable properties, appropriately adjusted. If similar buildings nearby are assessed at a lower value per square foot than yours, that disparity alone can win — regardless of what your income says.

06 The evidence that actually wins

Commercial cases are won on documentation. The evidence that carries the most weight:

• Current and historical rent rolls showing actual, not assumed, rents.
• Income and expense statements — your real NOI, reconstructed properly.
• Vacancy and leasing history demonstrating true occupancy.
• Market cap rate evidence from comparable transactions.
• Unequal appraisal comparables — a segmented peer set on a $/SF basis.
• Condition and capital expenditure records — deferred maintenance the district never saw.

07 Deadlines & the appeal path

The protest deadline is May 15, or 30 days after your Notice of Appraised Value is delivered, whichever is later. File on both market value and unequal appraisal to preserve every argument. If the informal review and ARB hearing don't reach the right number, commercial owners have two further options: binding arbitration for eligible properties, and a judicial appeal to district court — often worth it for higher-value assets where the savings justify the cost.

08 DIY or hire a pro?

You can protest commercial property yourself, and for a small single property it may be worth a try. But the gap between a generic filing and a properly reconstructed income approach with a segmented unequal-appraisal peer set is usually measured in tens of thousands of dollars. That's the difference professional representation is built to capture — and on contingency, it costs you nothing unless it works.