Katy ISD Adopted a $1.1171 Rate. The Number That Still Belongs to You Is the Appraised Value.

A property-tax bill is the product of two numbers. One is set by elected officials and adjusted at the ballot box. The other is set by an appraisal district and adjustable, every single year, at the appraisal review board. Katy ISD's action on September 21, 2026 determined the first number for every homeowner inside the district. It did nothing to determine — or fix — the second.

What the Board Actually Adopted

Per the district's post-adoption Taxpayer Impact Statement, Katy ISD's 2026 total tax rate breaks into two components. The maintenance-and-operations rate — the portion that funds day-to-day operations — is set at $0.7271 per $100 of taxable value. The interest-and-sinking, or debt-service, rate — which covers bond repayments — is set at $0.3900 per $100. Combined, they produce the adopted total rate of $1.1171 per $100.

These two components matter because Texas law treats them differently for purposes of the voter-approval rate calculation under Tax Code Section 26.07. But for a homeowner reading a tax bill, the practical question is simpler: what value is that rate being multiplied against?

The Two-Variable Equation Every Homeowner Should Understand

The Katy ISD Taxpayer Impact Statement is explicit about the sequence of calculations. For a qualifying residence homestead, the school-taxable value begins with the appraised value as capped by the 10% annual limit — a protection codified at Tax Code Section 23.23. From that capped value, the district then deducts the $140,000 state school-district homestead exemption available under Tax Code Section 11.13. What remains is the taxable value against which the $1.1171 rate is applied.

That sequence has a critical implication. The cap and the exemption can reduce taxable value, but they cannot correct an appraised value that was set too high in the first place. A 10% cap on an inflated number still produces an inflated base. A $140,000 exemption subtracted from an over-assessed appraised value still leaves more taxable exposure than is warranted.

A tax bill is a rate multiplied by a value. Katy ISD just set the rate. The appraisal district set the value — and the value is the number a homeowner can legally contest, every year, under the equal-and-uniform standard of Tax Code Section 41.43(b)(3).

Why the Rate Headline Is Not the Homeowner's Lever

Rate decisions by taxing units — school boards, city councils, county commissioners courts — are legitimate targets of civic engagement: public hearings, elections, and, for rates that exceed the voter-approval threshold, referenda under Tax Code Section 26.07. Those are meaningful tools. They operate at the policy level, on a district-wide or county-wide basis, and they turn on electoral cycles.

The appraisal protest process is different. It is an individual proceeding, initiated by the property owner, adjudicated at the Appraisal Review Board, and governed by a legal standard that asks a precise question: is this property's appraised value equal to the values assigned to comparable properties in the district? Tax Code Section 41.41 grants every property owner the right to protest. Tax Code Section 42.26 extends that equal-and-uniform standard through the district-court appeal stage.

Katy ISD spans portions of Harris, Fort Bend, and Waller counties — three separate appraisal districts, each running its own mass-appraisal models. Inconsistency in those models is exactly the condition that the equal-and-uniform standard is designed to remedy. When a homeowner's appraised value diverges from the median level applied to genuinely comparable properties, the ARB is required by statute to equalize downward.

What the 10% Cap Does — and Does Not — Do

The homestead appraisal cap, as referenced in the Katy ISD Taxpayer Impact Statement, limits the year-over-year increase in a homestead's appraised value to 10% under Tax Code Section 23.23. In a rising market, this can produce a meaningful gap between the market-assessed value and the capped taxable value — a figure sometimes called the "cap loss."

But the cap is a ceiling on annual movement, not a guarantee of accuracy. It does not prevent the appraised value from being set too high relative to comparables at the outset. And in years when the appraisal district resets values after a period of suppressed caps — catching up to market levels — the cap itself can absorb only so much of the correction before a homeowner's taxable exposure jumps sharply.

The appropriate response to an appraised value that is out of step with comparable properties is a protest grounded in the equal-and-uniform standard, not reliance on the cap's arithmetic. See our guide to what unequal appraisal means in Texas for a fuller explanation of how that standard works in practice.

The Practical Arithmetic for a Katy Homeowner

Consider what the adopted rate means in concrete terms. At $1.1171 per $100, every $10,000 of taxable value generates $111.71 in Katy ISD school taxes annually. For a home with a $400,000 appraised value, after applying the $140,000 exemption, the school-taxable base is $260,000 — producing a Katy ISD bill of approximately $2,904 before any other taxing-unit rates are layered on. If that appraised value were successfully protested down by $30,000, the same rate would reduce the school-tax portion of the bill by roughly $335 per year.

That is not a number drawn from any official projection — it is straightforward multiplication using only the rate figures in the district's adopted statement. The point is structural: the rate is fixed; the value is variable; and the value is where individual homeowners retain legal standing to act.

For homeowners in the Katy ISD footprint who want to understand whether their appraised value is defensible, the starting point is a comparison of their notice of appraised value — required to be delivered under Tax Code Section 25.19 — against the values assigned to similar nearby properties. TaxStand builds that comparison into a structured evidence packet. More context on the protest process for this region is available in our Insights archive.