The Guadalupe Appraisal District is in Seguin.
I worked there for six years, 2016 to 2022, as an appraiser. The values on the notices that show up in Seguin mailboxes every spring were my job.
So this is the Seguin protest guide written by somebody who used to be on the other side of it.
Seguin isn’t one market
This is the first thing I’d tell anyone protesting a Seguin value.
A 1960s brick house near downtown, a new build in a subdivision off I-10, a lake place on McQueeney or Dunlap, and five acres out toward Geronimo all have a Seguin address. They don’t have anything else in common.
The district values them with mass-appraisal models built on neighborhoods and sales. When a neighborhood has plenty of recent sales, the model’s usually close. When it doesn’t (older in-town streets, rural tracts, waterfront with wildly different lots), the model fills the gaps with whatever it has.
That’s where the holes are. A protest isn’t an argument about what your place is “really worth.” It’s an audit of where the district’s data is thin, stale or wrong.
Know which bill you’re actually fighting
Your Seguin tax bill is a stack: Guadalupe County, maybe the City of Seguin, your school district, and maybe a water district. In Seguin that school district is usually Seguin ISD, but parts of the area are in Navarro or Marion. Lakefront owners also carry Lake McQueeney WCID or Lake Dunlap WCID.
The protest doesn’t touch any of those rates. It only touches the value they all multiply against. Lower the value and every line drops at once.
If you want the line-by-line version, I broke down every line on a Guadalupe County tax bill, including Seguin ISD’s November rate election.
The two arguments that work
Market value. Your property’s appraised higher than it would sell for on January 1. You need sales of truly similar properties: same part of town, similar size and age, sold close to January 1. In Seguin “same part of town” matters more than people think. A sale across 123 can be a different market.
Unequal appraisal. Your property’s appraised higher than comparable properties, adjusted for differences. You can win this one even if your value is under market, and the evidence is the district’s own records. It’s the argument most homeowners skip.
What I’d check first on a Seguin account
- The facts on the record. Square footage, year built, number of baths, pool, condition rating. Older Seguin homes with additions and garage conversions are wrong on the record all the time.
- Land value on acreage and lake lots. Front footage, usable acreage, flood plain. Land schedules are blunt, and Seguin has a lot of land that isn’t average.
- The comps the district used. Request the district’s evidence before your hearing. If their comps are newer builds from a different subdivision, that’s your opening.
- Your exemptions. Homestead, over-65, disabled veteran. None of this fixes value, but it’s free money. The Guadalupe County homestead exemption guide has the details.
Filing and the hearing
The deadline’s May 15 or 30 days after your notice, whichever is later, and in 2027 May 15 is a Saturday. File online through the Guadalupe Appraisal District taxpayer portal, by mail, or in person at the office in Seguin.
The step-by-step for the whole county, including the informal review and the ARB, is in how to protest property taxes in Guadalupe County. If you end up in front of the review board, read what actually happens at an ARB hearing first.
Or let the ex-appraiser do it
In 2025 I had the highest average reduction of any agent in Guadalupe County. I don’t guarantee results can be perfectly duplicated. I take the time to find the holes in the data and exploit them.
$100 a year plus 25% of what I save you. Here’s how it works in Guadalupe County.
I used to set these values.
Now I take them apart.
Frequently asked questions
How do I protest my property taxes in Seguin?
File a protest with the Guadalupe Appraisal District by May 15 or 30 days after your notice was delivered, whichever is later. You can file through the district’s online taxpayer portal, by mail or in person. Then gather sales or unequal appraisal evidence for the informal review and, if needed, an ARB hearing.
What appraisal district handles Seguin property taxes?
The Guadalupe Appraisal District, which is based in Seguin, appraises property in Seguin and the rest of Guadalupe County. The tax bill itself comes from the county tax office.
Which school district is Seguin property in?
Most Seguin property is in Seguin ISD, but parts of the Seguin area are in Navarro ISD or Marion ISD. Check your property record or tax bill to confirm.
What is the best evidence for a Seguin property tax protest?
Sales of truly similar nearby properties close to January 1, an unequal appraisal comparison using the district’s own records, and corrections to wrong facts on your property record like square footage, condition or land size.
Sources: Texas Tax Code Sections 41.41, 41.43 and 41.44, via statutes.capitol.texas.gov; Guadalupe Appraisal District (guadalupead.org); Guadalupe Appraisal District 2026 certified roll for taxing units. Updated October 2026.