In a Texas multifamily deal, two line items decide whether the pro forma survives contact with reality: insurance and property tax. We covered the insurance line already. This is the tax half — and it's the one optimistic pitch decks hide in plain sight, because the number on the seller's operating statement is almost never the number you will actually pay.
Here's the uncomfortable part. In Texas, property tax is usually the single largest line on a multifamily operating statement, it has no flood-zone or coastal escape, and it resets every year on appraisal — including the year you buy, when the county gets to reassess the building to your purchase price. An operator who treats the annual protest as a discipline protects net operating income that an undisciplined operator simply hands to the county. And an LP who knows how to read that behavior has a selection filter most sponsors never expose.
Why property tax is the Texas wildcard
Texas has no state income tax, which is part of the pitch. The trade-off is that local governments lean hard on property tax, and for multifamily that means an expense line that frequently rivals or exceeds insurance, payroll, and management combined.
Three features make it dangerous to underwrite casually:
- It resets annually. Appraisal districts re-value every year. There is no long-term lock. Your model needs a tax line that grows, not a flat assumption copied from the seller.
- It reassesses on sale. When a property trades, the appraisal district can — and in a rising market, will — move the assessed value toward the transaction price. If the seller was carrying a stale, under-appraised basis, you inherit the correction.
- 2026 is pushing the wrong way. Appraisal districts are expected to push assessed values higher as Texas population and rent growth feed the comps, even while capital markets stay tight and exits stay slow. That combination — rising assessments against constrained NOI — is exactly what makes annual appeal planning non-optional rather than housekeeping.
The most common Texas multifamily underwriting error is modeling the seller's property-tax bill instead of the post-sale reassessment to your purchase price. The seller may have owned the building for years at a frozen, under-market assessed value. The day you close, that protection disappears — and a tax line that looked like 14% of EGI in the offering memo can reset to 18–20% in Year 1. Nothing about the building changed. The basis did.
The Year-1 reassessment trap, with numbers
This is the mechanic that quietly destroys Year-1 NOI, so it's worth working through concretely. Take a 200-unit Class B deal bought for $30,000,000. The seller had held it long enough that the appraisal district carried it at an assessed value of $19,000,000. At a representative ~2.5% effective rate, the seller's tax bill — the one printed in the offering memo — was about $475,000.
Then you close. The county reassesses toward your $30M purchase price.
| Line | Seller's frozen basis | Post-sale reassessment | Year-1 gap |
|---|---|---|---|
| Assessed value | $19,000,000 | $30,000,000 | +$11,000,000 |
| Effective tax rate (illustrative) | 2.5% | 2.5% | — |
| Annual property tax | $475,000 | $750,000 | +$275,000 |
| Per unit (200 units) | $2,375 | $3,750 | +$1,375 |
That $275,000 is real money the moment you take over. At a 6% cap rate, a $275,000 hit to NOI is roughly $4.6 million of value — on a deal you bought for $30M. If the sponsor underwrote the seller's $475K and didn't model the reassessment, the entire Year-1 return assumption is built on a number that expires at closing.
The counter is not magic, and it's the second half of the story.
The protest is a high-probability lever
Here is the fact that reframes property tax from "fixed cost" to "operator skill": roughly 80–90% of informal Texas property-tax protests result in a reduction. That is not a coin flip. It is one of the highest-probability NOI levers available to a multifamily operator, and most pro formas treat it as if it doesn't exist.
A protest works because the appraisal district's mass-appraisal model is blunt. For income-producing multifamily, the operator (or their tax agent) can argue value on an income approach — actual rent roll, actual expenses, actual vacancy — which frequently produces a lower supportable value than the district's automated comp. The reassessment-to-purchase-price that just hit you in Year 1 is itself a primary protest argument: a single arm's-length sale is not the same as stabilized market value, and a disciplined operator makes that case every year.
The catch is the clock.
The Texas protest window is short — generally a May 15 deadline, or 30 days from the date of your appraisal notice, whichever is later. Miss it and you are locked into the inflated valuation for the entire year, with no do-over. "Delayed action can lock in inflated valuations for years" is not a slogan; it is how an undisciplined operator bleeds NOI quarter after quarter. Every major county — Harris, Dallas, Tarrant, Travis, Bexar, Collin, Denton — now accepts online protest filing, so there is no logistical excuse for skipping a year.
The 3-Year Tax-Protest Exhibit — what to demand
If property-tax discipline is a real, repeatable operator skill, then it leaves a paper trail — and that paper trail is exactly the diligence artifact an LP should ask for. Don't accept "we handle taxes." Ask for the protest history, the same way you would ask for the insurance exhibit. A disciplined operator has it ready; a sloppy one will stall.
Here is the exhibit to request, with what each row tells you:
| What to ask for | What a strong answer looks like | What a red flag looks like |
|---|---|---|
| Protest filed each year (Y/N) | Filed every year, on every asset | "We didn't bother — taxes are fixed" |
| Who represents them | Named property-tax consultant or in-house specialist | No one; the GP "meant to get to it" |
| Reduction won (last 3 yrs) | Specific dollar/percent reductions per year | Can't produce numbers |
| Year-1 underwriting basis | Modeled the reassessment to purchase price | Used the seller's frozen assessed value |
| Assessed value vs purchase price | Knows the gap and has a protest plan for it | Has never looked |
[!PRO_TIP] The single most revealing question is the fourth row: "Did you underwrite the post-acquisition reassessment, or the seller's tax bill?" An operator who answers it cleanly — with the reassessed number and a protest plan — has shown you they understand the one trap that breaks most Texas Year-1 returns. An operator who looks confused has just told you their pro forma is optimistic by six figures.
How to underwrite the tax line yourself
You don't need to be a tax agent to pressure-test the number. Four moves:
- Find the assessed value gap. Pull the current assessed value (public on the county appraisal district site) and compare it to the purchase price. The bigger the gap, the bigger the Year-1 reassessment risk you should model.
- Re-tax to purchase price. Apply the local effective rate to your purchase price, not the seller's basis. That's your conservative Year-1 tax line.
- Credit the protest — but conservatively. A protest is high-probability, not guaranteed, and the reduction varies. Model a realistic appeal outcome (often a partial reduction back toward the income-approach value), and only count it once you've confirmed the operator actually files.
- Grow it annually. Don't flat-line the tax line across the hold. Texas assessments climb; your model should too.
Property tax is not a fixed cost in Texas — it is a controllable, high-probability NOI lever, and the operator's appeal discipline is a real differentiator you can read before you wire a dollar. Underwrite the reassessment, not the seller's frozen tax bill. Demand the 3-year protest exhibit. The 80–90% of operators who win their protests are protecting your return; the ones who skip the filing are handing it to the county.
This article is general information for real estate investors, not tax or legal advice. Property-tax rates, deadlines, and protest procedures vary by Texas county and change year to year — confirm specifics with a licensed Texas property-tax consultant or attorney before acting. Effective rates and dollar figures above are illustrative.
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