Your taxes going up after you buy a house in Texas isn't a reassessment, and it isn't the county finding out what you paid. It's a homestead cap expiring — the seller's — a full year before your own one starts. Here's the calendar it runs on, and what to do before you write the offer.
Somewhere in the first week of looking at a house, a number gets handed to you. It's on the listing. It's in the estimate your lender puts together. It lands again on the sheet that shows your monthly payment. It's the property tax figure, and in Tarrant County it's almost always the wrong one.
Not wrong because somebody made a mistake. Wrong because it isn't a fact about the house. It's a fact about the person selling it.
Nobody brings this up early, because it isn't anybody's job to bring it up. The listing agent is describing a house. The lender is required to estimate, and is allowed to estimate from last year's bill. The title company is prorating what's owed today. Every one of them is doing the job correctly, and the buyer still walks away with a number that won't hold.
Most people have heard the short version: your taxes go up after you buy. That part is true. What almost nobody explains is why it happens, and the popular explanation is wrong in a way that changes what you should do about it. This is the part of the buying conversation we'd rather have early than late.
It Isn't a Reassessment, and That Matters
Start with the thing most people have backwards. Buying a house in Texas doesn't cause the county to reappraise it, and it doesn't reset the value to what you paid. There's no such mechanism in the Texas Property Tax Code. That idea is borrowed from California, where a sale really does reset the assessment, and it gets repeated here constantly by people who've lived in both places.
What Texas does instead is appraise everything at market value on January 1, every year, whether it sold or not. Section 23.01(a) of the Tax Code says so plainly, and Section 25.18(b) requires a reappraisal at least once every three years regardless of what anybody does.
So the market value was never hidden, and nothing about your purchase revealed it. The appraisal district has been carrying it the whole time, right next to the lower number the seller was actually taxed on. Section 23.23(b)(2) requires them to record both.
When you look at the seller's tax bill, you're looking at the lower one. The question isn't what your house is worth. It's what's been holding the taxable number down, and whether that thing transfers to you.
It doesn't.
The Cap That Expires, and the One That Hasn't Started
The gap between those two numbers is the homestead cap, and it's worth getting exactly right.
Under Section 23.23(a), a homeowner with a residence homestead exemption has a limit on how much their appraised value can rise in a year: no more than ten percent over last year's appraised value, plus the market value of any new improvements. Somebody who owned the house for a decade in a neighborhood that appreciated faster than ten percent a year is sitting on a taxable value well under what the house is worth. That's not a loophole. That's the cap doing exactly what it was written to do.
Then the house sells, and two things happen that people tend to collapse into one.
The first: the seller's cap expires. Section 11.43(c) says a homestead exemption applies to the property until it changes ownership, and Section 23.23(c) expires the limitation on January 1 of the first tax year in which neither the previous owner nor their spouse qualifies. Their protection ends the January after the sale.
The second one is the part that gets skipped: your cap doesn't start then. Section 23.23(c) says the limitation takes effect on January 1 of the tax year following the first year you qualify for the exemption. For most buyers that first qualifying year is the one that starts the January after closing, under the ordinary rule in Section 11.42(a). Section 23.23(c-1) covers the narrower case below, where a buyer takes the mid-year exemption: it treats them as having qualified on that same January 1 rather than earlier, so they land on the same schedule as everybody else.
Chain those together for a house bought in 2026. The seller's cap comes off on January 1, 2027. You first qualify on that same date, so your own cap doesn't take effect until January 1, 2028. Which leaves the 2027 tax year with no ten percent ceiling on it — market value is the only limit left.
That uncapped year is the one that breaks the estimate. Here is the whole thing on a calendar, for a house bought in 2026.
- You close, 2026. Nothing changes. The seller's exemption and cap run for the rest of that tax year.
- January 1, 2027. The seller's cap expires and yours has not started. The appraised value can be raised to full market value with no ten percent ceiling. This is the year that breaks the estimate.
- January 1, 2028. Your own cap takes effect and limits increases from there forward.
So the short version people repeat is right about the timing and wrong about the cause. Your taxes don't rise because the county found out what you paid. They rise because a discount that belonged to somebody else came off, and the one that belongs to you hadn't started yet. Those are different problems with different answers, and only one of them is something you can plan around.
The Exemption You File Yourself
The seller's exemption doesn't come with the house. You file your own, and since a 2022 change to the law you don't have to wait for January to do it.
Section 11.42(f) lets someone who acquires a home after January 1 receive the general residence homestead exemption for the applicable part of that year, as soon as they qualify. Good news, with one condition attached, and it's the condition everybody drops: it only works if the previous owner didn't already receive that same exemption for that tax year.
Most Texas sellers are homesteaded. So for most buyers, most of the time, the seller already used it up for that year and the immediate filing isn't available. You wait for the next January 1.
The deadline is worth knowing in both forms. The familiar one is the end of April, and it governs the ordinary January 1 track. If you bought mid-year and you're filing under Section 11.42(f), Section 11.43(d) gives you until the first anniversary of the date you acquired the property. And if you missed it altogether, Section 11.431(a) allows a late application up to two years after the delinquency date. That's the one that saves people who didn't learn any of this until year three.
One thing you don't have to do is refile every year. Section 11.43(c) says once it's allowed, it needn't be claimed again. Don't read that as untouchable, though. Districts have to review every homestead exemption at least once every five years, and the chief appraiser can ask for a new application.
Why the Payment Can Rise Twice
The tax code explains the bill. It doesn't explain the payment, which runs on a separate system with its own rules, and the seam between the two is where the surprise actually lands.
Your escrow account lives under federal mortgage servicing rules, not Texas law. Under 12 CFR 1024.17(c)(7), when a servicer knows what an escrow item will cost, it has to use that figure. When it doesn't know, it's permitted to estimate from the preceding year's charge. That permission is where the surprise comes from: the preceding year's charge is the seller's charge, on the seller's capped value, with the seller's exemption sitting on it.
Then the real bill arrives, and the servicer runs its escrow analysis and sends the annual escrow account statement that 12 CFR 1024.17(i) requires. Now there are two problems at once. The ongoing monthly escrow has to rise to cover the actual tax going forward, and the account is already short for the months behind you. Under 1024.17(f)(3) the servicer can require that shortage be repaid over at least twelve months.
So the payment goes up for the new number, and up again to catch up on the old one. Both increases arrive in the same letter, which is why people describe this as their payment jumping rather than drifting.
One fair caveat: the regulation permits the prior-year estimate, it doesn't require it. Some servicers estimate closer to market. Ask yours which one they did. They'll know.
Five Things Worth Getting Straight
These are the five that come up most often, and the five most likely to cost you something.
“Texas reassesses your home to the purchase price.” No. Market value on January 1, for everyone, sold or not. What changed was the cap, not the appraisal.
“The seller's exemption carries over to me.” It doesn't. It ends when the property changes hands, and yours is a separate application you file yourself.
“New owners can file for homestead right away.” Only if the seller didn't already claim it that year, which is the common case, not the rare one.
“The ten percent cap means my taxes can't rise more than ten percent.” It caps appraised value, not the bill. Rates are set separately every year by every taxing unit. And the market value of new improvements gets added on top of the ten percent, so a renovation isn't covered by it.
“I'll just look up what it sold for.” Texas is a non-disclosure state, in practice rather than by any single statute. Nothing requires a sale price to be recorded publicly, and Section 22.27 makes price information given to an appraisal district in confidence confidential. The deed is public. The number isn't on it. Appraisal districts aren't blind, and they have their ways of finding out, but you won't get there by pulling the deed.
What to Actually Do
None of this is a reason not to buy a house. It's a reason to run the uncapped year's number before you write the offer, instead of meeting it in the escrow letter that follows the 2027 bill.
Three practical things.
Look up the parcel, not the city. There's no single Fort Worth tax rate. A bill is the sum of overlapping taxing units stacked on the same house, and two homes a few streets apart can carry different totals. Tarrant County publishes the adopted rates for every unit, and the county's Truth-in-Taxation site will show you the ones that actually tax that specific address. Any single rate you read in an article is stale by the next autumn anyway, since every unit adopts a fresh one each year.
Ask what your escrow was built on. Not what it is. What it was estimated from. If the answer is last year's bill, you already know what the first escrow analysis is going to say.
Budget the uncapped year. Run the payment against market value with your exemption but no cap, and see whether you still like the house. Most people do. The ones who get hurt are the ones who never ran it.
And if you'd rather not run it alone, this is the part of a buyer's agent's job that happens before the fun part. Bring us an address and we'll do the arithmetic on it with you: the real uncapped-year number, in the neighborhood you're actually looking in. We'd rather you saw that number before you write the offer than after the 2027 bill. If you're selling as well as buying, the same math runs backwards, and a home valuation is where that conversation starts.
We're real estate agents, not tax advisers, and what's above is arithmetic with public numbers rather than tax advice. All of it came straight out of the statutes, which hold up better than any article about them: Texas Tax Code Chapters 11, 22, 23 and 26, and 12 CFR 1024.17 for the escrow side. For your own situation, the Tarrant Appraisal District and your tax professional are the two to call. We're here for the house part.
