Katy TX Property Taxes Explained: What Homeowners Need to Know in 2026

Property taxes in Katy, TX combine city, Katy ISD, county, and MUD rates. The Fort Bend County effective rate averages ~1.65%. The 2026 school district homestead exemption is $140,000 — file Form 50-114 with your CAD by April 30 each year.

TL;DR: 

Your Katy tax bill stacks city, Katy ISD, county, and MUD rates — your county determines which appraisal district you deal with. The school district homestead exemption jumped to $140,000 in 2026; file Form 50-114 with your CAD if you haven't. Your protest deadline is May 15 every year, and it's worth doing.

By Katie Curran | June 20, 2026

Property taxes in Katy, TX are one of the most misunderstood parts of buying or owning a home here — and Katie Curran at MKAT Group | Keller Williams Signature fields questions about them on nearly every transaction in the Greater Houston area. This guide breaks down exactly how Katy TX property taxes are calculated, what exemptions are available in 2026, and what to do if your appraisal looks too high.

The complexity starts with geography. Katy sits across three counties — Harris, Fort Bend, and Waller — and your total tax rate depends entirely on which one your address falls in. Whether you're buying your first home in Cinco Ranch, moving up to a newer build in Elyson, or trying to figure out why your bill went up again, the framework is the same: know your county, file your exemptions, and don't skip the protest window.

If you're still weighing Katy against other Houston suburbs, the cost of living breakdown for Katy, TX covers taxes alongside housing costs, utilities, and everyday expenses in one place.

What Are Property Taxes in Texas — and Why Are They Higher Than Most States?

Texas has no state income tax. That trade-off is largely funded by property taxes, which are administered at the local level. Your annual property tax bill in Katy is calculated using three inputs:

• Your property's appraised value, set by your county appraisal district each January

• The combined tax rate of every taxing entity with jurisdiction over your property

• Any exemptions you've applied for and qualified for

The formula: (Appraised Value − Exemptions) × Combined Tax Rate = Annual Tax Bill

For example, a home appraised at $450,000 with a $140,000 school district homestead exemption applied produces a taxable value of $310,000 for that portion of the bill — a meaningful difference from the raw appraised number.

Which County Is Your Katy Home In — and Why Does It Matter?

Katy's city limits and surrounding communities span Harris, Fort Bend, and Waller counties. Which county your property falls in determines your appraisal district, your county-level tax rate, and where you file exemptions or protests.

County	Appraisal District	Phone
Harris	Harris County Appraisal District (HCAD)	713-957-7800
Fort Bend	Fort Bend Central Appraisal District (FBCAD)	281-344-8623
Waller	Waller County Appraisal District	979-921-0060

The City of Katy proper and most central master-planned communities fall within Harris County or Fort Bend County. Newer development further west — toward Brookshire and beyond — increasingly falls in Waller County, where rates tend to run lower.

This matters most when you're comparing listings across subdivisions. Many buyers shopping master-planned communities in Katy don't realize that two homes in adjacent neighborhoods can carry meaningfully different tax rates simply because of county lines.

What Is the Current Property Tax Rate in Katy, TX?

Your total rate is the sum of every taxing entity with jurisdiction over your address. A typical Katy homeowner's bill layers together:

• City of Katy: $0.4250 per $100 of assessed value — held flat for two consecutive fiscal years through 2025–26

• Katy ISD: $1.1171 per $100 ($0.7271 maintenance & operations + $0.39 debt service) — also held flat for a second consecutive year

• County, MUD, and special district rates: Vary by specific location

When all entities are combined, the effective total tax rate for a Fort Bend County Katy homeowner averages approximately 1.65% — with a typical annual bill around $6,700–$7,000 before exemptions.

One number to anchor on: at a 1.65% effective rate, a $500,000 home in Katy generates roughly $8,250 in annual property taxes before any exemptions are applied.

Harris County Katy covers established neighborhoods closer to I-10 and the city core. Harris County's effective rates have historically run slightly higher than Fort Bend when MUDs and special district levies are factored in.

Fort Bend County Katy covers a large portion of master-planned communities including areas of Cinco Ranch, Firethorne, and newer build corridors. The effective combined rate averages 1.65%, with typical annual bills in the $6,700–$7,500 range.

Waller County Katy generally carries lower county-level rates than the other two, making some far-west Katy developments more tax-efficient on a comparable home value. That said, newer Municipal Utility Districts in those areas can offset part of the savings.

On two otherwise identical $500,000 homes, a 0.25% difference in effective tax rate equals $1,250 per year — more than $100 per month. That difference affects what a buyer qualifies for at the lender level and how competing offers compare. Always request a property-specific tax estimate before writing an offer.

This is one reason why new construction buyers in Katy should pay close attention to which county and MUD district a new build falls in before signing — tax rates in brand-new communities can be higher in the early years as MUD debt is still being retired.

What Exemptions Can Reduce Your Katy TX Property Tax Bill?

Exemptions are one of the most underused tools in a Texas homeowner's toolkit — especially for first-time buyers who don't know to file within the first year.

General Homestead Exemption Available to any homeowner whose primary residence is in Texas. Benefits include:

• School district exemption: $140,000 off your appraised value (increased from $100,000 as of the 2025 tax year, retroactive)

• City of Katy exemption: 20% of appraised value, minimum $5,000

• Appraisal cap: Once a homestead exemption is on file, your taxable value cannot increase more than 10% per year, regardless of what the market does

Over-65 Exemption Homeowners 65 and older receive an additional $60,000 school district exemption (bringing the total school district exemption to $200,000), plus a school tax freeze that permanently caps school district taxes at the amount paid the year the exemption was granted. That ceiling can go down; it cannot go up.

Disability Exemption Qualifying disabled homeowners can apply for an additional $100,000 school district exemption.

Veteran Exemptions Texas offers partial or full property tax exemptions to veterans with service-connected disabilities, scaled to the VA disability rating.

How to apply: File Texas Comptroller Form 50-114 with your county appraisal district — HCAD, FBCAD, or Waller CAD depending on your address. File by April 30 for the exemption to take effect the same tax year. The filing is free and only needs to be done once.

Why Do Property Taxes Matter When You're Buying or Selling in Katy?

Property taxes directly affect your monthly housing payment. Lenders calculate your PITI — principal, interest, taxes, and insurance — and tax estimates feed directly into how much home a buyer qualifies for.

A $500,000 home with a 1.8% effective tax rate adds approximately $750 per month in escrow taxes alone. At 2.0%, that same home runs $833 per month in taxes. That spread affects qualification and monthly cash flow in ways that don't always show up clearly in the list price.

For sellers, it matters too. A buyer's lender will underwrite to the unexempted tax rate if no homestead exemption is currently on the property — which can affect what a buyer qualifies for and how the offer needs to be structured.

If you're comparing two homes in different Katy subdivisions, the tax picture can swing $150–$350 per month between them — before the mortgage even enters the conversation.

The Katy, TX neighborhood guide covers the major community areas and can help you orient to where these rate differences tend to cluster geographically.

How Do You Protest Your Katy TX Property Appraisal — and Is It Worth Doing?

Yes, and more homeowners should. The process is more approachable than most people expect.

The annual protest deadline is May 15. If your notice of appraised value arrives and the number looks too high, you have the right to challenge it with your appraisal district.

What to bring to a protest:

• Recent comparable sales of similar homes in your neighborhood at lower values

• Documentation of property condition — repairs needed, deferred maintenance, inspection reports

• A recent independent appraisal, if you have one

Each district has an online protest portal. Submit before May 15. Most protests start with an informal hearing — many are resolved at that stage without ever reaching the Appraisal Review Board.

Third-party protest services operate throughout the Houston market on contingency — they only charge if they get your value reduced, typically 30–40% of the first year's savings. For homes over $400,000, the math often works in your favor.

What Do Katy Homeowners Most Want to Know About Property Taxes?

Q: What is the property tax rate in Katy, TX for 2026?

A: A typical Katy homeowner's combined effective rate falls between 1.6% and 2.2% of assessed value depending on county and subdivision. Fort Bend County averages approximately 1.65% total when all taxing entities are combined.

Q: How do property taxes in Katy, TX compare to the rest of the Houston area?

A: Katy's rates are broadly in line with the Greater Houston metro, though your specific total depends heavily on which county you're in and whether your community sits within a MUD. If you're weighing Katy against other suburbs, the Katy vs. Cypress comparison covers both communities' cost profiles side by side.

Q: Does the homestead exemption cap how much my home's taxable value can increase?

A: Yes. Once a homestead exemption is active, your taxable value can increase no more than 10% per year, regardless of market appreciation. That cap is one of the most valuable protections available to Texas homeowners — and it's completely free to file.

Q: How do property taxes work differently in Fulshear compared to Katy, TX?

A: Fulshear sits primarily in Fort Bend County, and newer master-planned communities there often carry MUD rates that are higher than established Katy subdivisions — though those rates decrease over time as bonds retire. You can explore the Fulshear market context in the Fulshear, TX buyer's guide.

Q: When should I involve a Katy real estate agent in a property tax question?

A: Before you write an offer. A local agent can pull the actual tax history and MUD rate for a specific address — not just the county average — so you know exactly what escrow will look like before you're under contract. Reach out to MKAT Group and we'll run those numbers for your specific situation.

Property taxes in Katy, TX are manageable once you understand the framework — and the exemptions alone can make a significant difference in your monthly payment. If you have questions about a specific address or want to know what the tax picture looks like on a home you're considering, Katie Curran at MKAT Group | Keller Williams Signature is happy to pull those numbers for you. Get in touch here.

About Katie Curran

Katie Curran is a licensed REALTOR® and co-founder at MKAT Group | Keller Williams Signature, serving buyers and sellers across the Greater Houston area including Katy, Fulshear, Cypress, Richmond, Brookshire, Hockley, and Sealy, TX. Katie brings a systems-driven, data-informed approach to every transaction. She has been licensed in Houston-area real estate since 2020 at KW Signature. Connect with Katie at mkatgroup.com.

Katie Curran | REALTOR® | Greater Houston | MKAT Group | Keller Williams Signature

713-598-1889 | katie@mkatgroup.com | mkatgroup.com