Katy, TX Property Tax Guide: Rates, MUD Taxes, Exemptions and Estimates

Last reviewed: August 2026

Property taxes are an important part of the cost of owning a home in Katy, TX, but determining what a particular homeowner may pay is not as simple as finding one citywide tax rate.

Katy spans portions of Harris, Fort Bend, and Waller counties. Properties with Katy mailing addresses may also be located in different school districts, municipal utility districts, emergency services districts, cities, and other taxing jurisdictions. As a result, two homes with similar prices can have meaningfully different property tax bills.

This guide explains how Katy, TX property taxes work, why rates vary, how exemptions may affect taxable value, and what buyers and homeowners should verify before making financial decisions.

Is There One Property Tax Rate for Katy, TX?

No. There is no single property tax rate that applies to every home with a Katy, TX address.

A property’s combined tax rate may include taxes imposed by several different entities, including:

The county
A school district
A city
A municipal utility district, commonly called a MUD
An emergency services district
A community college district
Other special-purpose taxing units

Not every property is served by the same combination of taxing entities. A home may be inside or outside the City of Katy, located in one of three counties, assigned to a particular school district, and situated within one or more special districts.

That is why a listing’s Katy mailing address, ZIP code, subdivision name, or advertised tax rate should not be treated as a complete municipal-boundary or tax-jurisdiction determination.

The correct analysis must begin with the exact property.

How Are Property Taxes Calculated in Katy, TX?

A simplified property tax estimate uses the following calculation:

Taxable value × combined tax rate = estimated annual property tax

Texas tax rates are often expressed as an amount per $100 of taxable value. For example, a combined rate shown as $2.50 per $100 of taxable value is equivalent to 2.50%.

Illustrative property tax calculation

Assume a home has:

A taxable value of $400,000
A combined tax rate of 2.50%

The estimated calculation would be:

$400,000 × 0.025 = $10,000 per year

That would equal approximately $833 per month when divided over 12 months.

This is only an illustration. It is not a representation of the tax rate or future tax bill for any particular Katy, TX property.

A reliable estimate requires the property’s current taxing entities, adopted tax rates, applicable exemptions, taxable values, ownership circumstances, and other property-specific information.

Market Value, Appraised Value and Taxable Value

Several different values may appear in an appraisal district’s property record. They do not necessarily mean the same thing.

Market value

Market value is the appraisal district’s opinion of the property’s value as of January 1 of the applicable tax year, subject to Texas property tax law.

The appraisal district’s market value is not necessarily the same as:

The property’s list price
The price a buyer pays
A lender’s appraisal
A REALTOR® comparative market analysis
The amount for which the property could eventually sell

Appraised value

The appraised value is the value determined under the applicable appraisal rules. For a qualifying residence homestead, an appraisal limitation may restrict how quickly the appraised value used for taxation can increase.

The limitation does not prevent the appraisal district from determining a higher market value. It also does not guarantee that the owner’s actual tax bill will remain unchanged.

Taxable value

Taxable value is generally the value remaining after applicable exemptions and limitations are considered for a particular taxing unit.

Different taxing entities may offer different exemptions. Therefore, the taxable value shown for school district taxes may not be identical to the taxable value used by the county, city, MUD, or another taxing unit.

What Makes Up a Katy Property Tax Bill?

A property owner does not simply pay one “Katy tax.” The final bill can reflect several independently adopted rates.

County taxes

Katy-area properties may be located in:

Harris County
Fort Bend County
Waller County

The applicable county depends on the physical location of the property, not merely the mailing address.

School district taxes

School district taxes frequently represent a substantial portion of the combined property tax rate. Katy-area homes may be served by different school districts.

A Katy mailing address should not be used as confirmation that a property is zoned to Katy Independent School District. The applicable school district, attendance boundaries, and taxing jurisdictions must be verified for the individual property.

City taxes

A property with a Katy, TX mailing address is not necessarily located within the incorporated boundaries of the City of Katy.

A property outside the city limits may not pay City of Katy property taxes, but it may be subject to other taxing entities that do not apply to a home located inside the city.

Municipal utility district taxes

MUD taxes are common in many Houston-area communities. A MUD may finance and provide infrastructure or services such as water, wastewater, drainage, and related improvements.

Because districts have different debt obligations, tax bases, operating expenses, and financial circumstances, MUD tax rates can vary. Two nearby properties, including homes marketed as being within the same broader community, may not necessarily have the same MUD or combined tax rate.

Other special district taxes

Depending on the property, a tax bill may also include an emergency services district, community college district, drainage district, or another special-purpose taxing unit.

The appraisal district’s property record and the applicable tax offices can help identify the entities associated with an individual property.

Which Appraisal District Serves a Katy, TX Property?

The county in which the property is physically located generally determines the central appraisal district responsible for appraising it.

Harris Central Appraisal District

The Harris Central Appraisal District, commonly called HCAD, serves properties located in Harris County.

Homeowners can use HCAD’s website to:

Search for a property
Review appraisal information
View listed taxing jurisdictions
Research exemptions
File an exemption application
Access protest information

Visit the Harris Central Appraisal District website.

Fort Bend Central Appraisal District

The Fort Bend Central Appraisal District, commonly called FBCAD, serves properties located in Fort Bend County.

Its online services include:

Property searches
Exemption resources
Online appeals
Appraisal information
Forms and taxpayer resources

Visit the Fort Bend Central Appraisal District website.

Waller County Appraisal District

The Waller County Appraisal District serves properties located in Waller County.

Its website provides property searches, exemption information, forms, appraisal resources, and access to its taxpayer portal.

Visit the Waller County Appraisal District website.

An appraisal district determines property values and administers exemptions, but it may not be the office that collects every tax appearing on the property. Questions about actual tax bills, payment status, or adopted tax rates may need to be directed to the applicable tax assessor-collector or taxing unit.

What Is a MUD Tax?

A municipal utility district is a governmental entity that may finance, construct, operate, or maintain infrastructure and services within its boundaries.

In a developing community, a MUD may help fund facilities needed to support homes and other development. The district can issue bonds and levy taxes, subject to applicable law, to pay debt and operating expenses.

Why MUD rates vary

A MUD’s tax rate may be affected by factors such as:

Outstanding debt
Operating expenses
The number and value of taxable properties
The stage of development
Infrastructure obligations
Annual decisions made by the district

It is sometimes assumed that every newer Katy-area community has the same type of MUD tax or that a MUD rate will automatically decline. Neither assumption should be made without reviewing the specific district.

How buyers can research a MUD

Before purchasing a home, a buyer should determine:

Whether the property is located in a MUD
The name of the district
The district’s current adopted tax rate
Whether another special district also applies
Whether the seller’s tax information includes exemptions unavailable to the buyer
Whether the available estimate reflects the buyer’s anticipated ownership circumstances

Relevant statutory notices and transaction documents may also contain information about a district. Buyers should review those documents carefully and direct legal, tax, lending, or district-specific questions to the appropriate professionals or governmental entity.

How Do Homestead Exemptions Affect Property Taxes?

A residence homestead exemption may reduce the taxable value of an owner’s qualifying principal residence.

Texas provides a general residence homestead exemption for school district taxation, subject to current law and eligibility requirements. Counties, cities, and certain other taxing units may provide additional exemptions.

Other exemptions may be available for qualifying property owners, including certain:

Homeowners age 65 or older
Individuals with disabilities
Disabled veterans
Surviving spouses
Surviving family members of certain first responders or members of the armed services

Eligibility, exemption amounts, documentation, filing procedures, and the taxing entities to which an exemption applies can differ. Homeowners should confirm the current requirements with the appropriate appraisal district.

Homeowners should be cautious about unsolicited companies claiming that an upfront payment is required to file a standard homestead exemption application. The applicable appraisal district provides official filing information and forms.

Does a Homestead Exemption Transfer to the Buyer?

A buyer should not assume that the seller’s exemptions, taxable value, or appraisal limitations will continue unchanged after the sale.

The seller’s displayed tax bill may reflect:

A residence homestead exemption
An over-65 or disability exemption
A disabled veteran exemption
An appraisal limitation based on the seller’s ownership history
Other exemptions for which the buyer may not qualify

The buyer must establish eligibility for the exemptions available under the buyer’s circumstances and follow the applicable filing process.

This is one reason the seller’s current tax bill can be a poor predictor of the buyer’s future tax obligation.

How Does the Homestead Appraisal Limitation Work?

A qualifying residence homestead may receive an appraisal limitation, sometimes informally called the “homestead cap.”

The limitation generally restricts increases in the property’s appraised value for taxation under the applicable formula. It does not:

Freeze the property’s market value
Freeze the tax rate
Guarantee that the tax bill cannot increase
Transfer the seller’s ownership history to a new buyer
Mean that taxes can rise by only a fixed percentage
Apply merely because the home is owner-occupied without the required exemption and eligibility

The Texas Comptroller explains that the appraisal limitation takes effect on January 1 of the tax year following the year in which the homeowner qualifies for the residence homestead exemption.

Homeowners should confirm how current law applies to their property with the appraisal district or a qualified tax professional.

Review the Texas Comptroller’s property valuation guidance.

Will Property Taxes Be Based on the Purchase Price?

Not automatically.

Texas is generally considered a nondisclosure state, and the appraisal district performs its own appraisal under Texas law. A sale may be considered as part of the information available to an appraisal district, but the contract price does not mechanically become the taxable value in every transaction.

At the same time, a buyer should not assume that the seller’s capped appraised value will continue after the ownership change.

For planning purposes, buyers should use a reasonable, property-specific estimate rather than relying solely on the seller’s most recent tax bill.

Why Can the First Tax Bill After a Purchase Be Surprising?

A seller may have owned the property for years and benefited from exemptions or an appraisal limitation. The mortgage company’s initial escrow calculation may also rely on a prior tax bill that does not reflect the buyer’s future taxable value.

After the appraisal district updates its records, the buyer’s taxable value or available exemptions may differ from the assumptions used at closing.

This can contribute to:

A higher annual tax bill
An escrow shortage
A larger required escrow deposit
An increase in the monthly mortgage payment

An escrow account does not reduce property taxes. It is a method through which the lender collects money as part of the monthly payment and later uses those funds to pay eligible tax and insurance bills.

Buyers should ask their lender how property taxes were estimated and whether the estimate accounts for a possible post-sale change in taxable value.

Can Property Taxes Increase When the Tax Rate Decreases?

Yes.

The tax rate and taxable value are separate parts of the calculation. A lower combined rate does not necessarily produce a lower bill if the taxable value increases enough to offset the rate reduction.

The opposite may also occur. A property’s value can rise while an adopted rate falls, resulting in a tax bill that increases, decreases, or remains relatively similar.

To understand a change in the actual tax bill, review both:

The taxable value used by each taxing entity
The rate adopted by each taxing entity

How to Estimate Taxes on a Katy, TX Home

A buyer can use the following process to develop an initial estimate.

1. Confirm the property’s county

Do not rely solely on the mailing city or ZIP code. Determine whether the property is in Harris, Fort Bend, or Waller County.

2. Search the appraisal district record

Use the appropriate appraisal district’s official website and search the exact property address or account number.

3. Review every listed taxing entity

Identify the county, school district, city, MUD, emergency services district, and other applicable units.

4. Check the tax year

Rates can change annually. Make sure the rates and values being used apply to the same tax year.

5. Review the seller’s exemptions

Determine whether the current record contains exemptions or appraisal limitations that may not apply to the buyer.

6. Use a reasonable future taxable value assumption

Do not automatically use the seller’s current taxable value. Consider the purchase price, available market evidence, the appraisal district’s market value, and the possibility of a post-sale change in appraised or taxable value.

7. Add the applicable rates

Use the rates for the taxing entities serving the property. Be careful not to duplicate a rate or include a taxing unit that does not apply.

8. Discuss the estimate with the lender

Ask what annual tax amount the lender is using to calculate the anticipated payment and escrow requirement.

9. Verify material information

Before relying on an estimate, confirm the information with the appraisal district, applicable tax offices, lender, and qualified tax or legal professionals as appropriate.

Buyer’s Property Tax Due-Diligence Checklist

Before making an offer or completing a purchase, consider verifying:

The property’s county
Whether it is inside a city’s incorporated limits
The applicable school district
The specific MUD, if any
Other special taxing districts
The current combined tax rate
The tax year associated with the quoted rate
The seller’s exemptions
Whether the seller has an appraisal limitation
The appraisal district’s current market and appraised values
A reasonable estimate of the buyer’s future taxable value
The lender’s tax and escrow assumptions
The potential effect on the buyer’s total monthly housing payment

Property taxes should be considered alongside principal, interest, homeowners insurance, possible flood insurance, homeowners association assessments, maintenance, utilities, and other costs of ownership.

How Do Property Owners Protest an Appraisal?

A property owner who believes an appraisal is incorrect or unequal may have the right to file a protest with the local appraisal review board.

Depending on the circumstances, an owner may protest issues involving:

Market or appraised value
Unequal appraisal
Denial or modification of an exemption
Incorrect property characteristics
Inclusion of property on the appraisal records
Other matters permitted under Texas law

The usual protest deadline is May 15 or 30 days after the appraisal district delivers the notice of appraised value, whichever is later. Different deadlines or procedures may apply under particular circumstances.

Owners should review the deadline printed on their notice and use the official instructions supplied by the appraisal district.

The protest process may include:

Filing a notice of protest
Reviewing the appraisal district’s evidence
Participating in an informal review, if available
Attending a hearing before the appraisal review board
Considering further appeal rights when appropriate

Read the Texas Comptroller’s appraisal protest guidance and consult the appropriate appraisal district for current local procedures.

Frequently Asked Questions About Katy, TX Property Taxes

What is the property tax rate in Katy, TX?

There is no single Katy, TX property tax rate. The combined rate depends on the exact property’s county, school district, city status, MUD, emergency services district, and other taxing entities.

Are property taxes lower in Harris, Fort Bend, or Waller County?

County location is only one part of the calculation. A meaningful comparison must consider all taxing entities, the property’s taxable value, applicable exemptions, and current adopted rates. It would be misleading to assume one county is always less expensive without comparing specific properties.

Does every Katy, TX home have a MUD tax?

No. Some properties are located in MUDs and others are not. District boundaries do not necessarily follow subdivision names, ZIP codes, or mailing addresses.

Does a Katy mailing address mean the home is inside the City of Katy?

No. A Katy mailing address does not establish that the property is within the City of Katy’s incorporated boundaries. Municipal limits should be verified through official maps or directly with the governmental entity.

Does a Katy address mean the home is zoned to Katy ISD?

No. A mailing address does not establish the school district or a specific school assignment. Buyers should independently verify the applicable school district and current attendance boundaries.

Does the seller’s homestead exemption transfer to the buyer?

The buyer should not assume the seller’s exemption or appraisal limitation will continue unchanged. The buyer must qualify and apply based on the buyer’s ownership and occupancy circumstances.

Will the buyer’s tax bill equal the seller’s most recent bill?

Not necessarily. The seller’s bill may reflect exemptions, capped value, or other circumstances that will not apply to the buyer.

Will my taxes be based on what I paid for the home?

The purchase price does not automatically become the taxable value. The appraisal district determines value under Texas law. However, the seller’s prior taxable value should not be assumed to predict the buyer’s future taxable value.

Can property taxes change every year?

Yes. Market value, appraised value, exemptions, taxing-unit rates, and other circumstances can change. A property owner should review the appraisal notice and tax bill each year.

Can my mortgage payment increase because of property taxes?

Yes. If the lender maintains an escrow account, a higher projected tax bill or an escrow shortage can increase the required monthly payment.

Where can I find the tax rate for a particular home?

Start with the official central appraisal district serving the county in which the property is located. Review the property record and taxing entities, then verify adopted rates and billing information through the appropriate tax offices.

Can a REALTOR® guarantee my future property tax bill?

No. A REALTOR® can help identify relevant property information and develop an initial estimate, but future values, rates, exemptions, and decisions by appraisal districts or taxing units cannot be guaranteed. Material figures should be verified with the applicable governmental offices, lender, and qualified tax or legal professionals.

Comparing Homes in Katy, TX?

Property taxes can materially affect affordability, especially when comparing homes in different Katy-area communities.

A lower purchase price does not always mean a lower monthly housing cost. The combined tax rate, insurance, homeowners association assessments, MUD obligations, exemptions, and anticipated taxable value should all be considered.

As a Katy resident and experienced local real estate broker, I help buyers examine the property-specific details that can affect their decisions. That includes identifying the county, reviewing available appraisal district information, recognizing possible MUD or special-district considerations, and helping buyers ask better questions before making an offer.

If you are comparing homes in Katy, TX, contact Jonathan McNabb, REALTOR® and Broker/Owner of Nest Ahead, for local guidance tailored to your move.

Important Information

This guide is provided for general educational purposes. Property tax laws, values, exemptions, rates, district boundaries, and administrative procedures can change. The information presented here is not legal, tax, accounting, lending, or financial advice and should not be used as a guarantee of any property’s present or future tax bill.

Consumers should independently verify property-specific information with the appropriate central appraisal district, tax assessor-collector, taxing entities, lender, attorney, CPA, or other qualified professional.

About Jonathan McNabb, REALTOR®

Jonathan McNabb is the Broker/Owner of Nest Ahead and a longtime Katy, TX resident. He combines extensive real estate and legal-industry experience with practical knowledge of Katy-area communities, relocation considerations, new construction, negotiations, and the home-buying process.

Jonathan helps buyers and sellers make informed real estate decisions throughout Katy, TX, West Houston, Cypress, Fulshear, Richmond, Sugar Land, and surrounding communities.

Jonathan McNabb, REALTOR®
Broker/Owner, Nest Ahead
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