New Construction Taxes in Rockwall County: The Year 2 Jump
New Construction Taxes in Rockwall County: The Year 2 Jump
Why does your mortgage payment jump in year two on a new construction home in Texas?
- Texas appraisal districts value property in the condition it was in on January 1. If your home was a lot, a slab, or a frame on January 1, that year's tax bill reflects the lot — not the finished house.
- The following January 1, the completed home lands on the tax roll at full market value, and the tax bill can climb four to five times higher.
- Your lender then runs its annual escrow analysis, discovers the account is short, and raises your monthly payment to cover both the higher ongoing taxes and the shortage from the year that just ended.
- On a $500,000 home in Rockwall County, that combination can push the monthly payment up roughly $750 for a year, then settle around $380 above where it started.
By Cindy Dunnican | September 4, 2026
The tax figure on your builder's payment worksheet is almost never the tax figure you'll actually pay. Not because anyone misled you — because of one date in the Texas Tax Code.
Texas appraises property as of January 1, in whatever condition it happened to be in on that date. That single rule is behind almost every "my mortgage payment went up $600 and nobody warned me" call I get from new construction buyers in Fate, Royse City, Rockwall, and Heath.
It's entirely predictable. It's also entirely preventable, if you handle it before you close instead of after.
How January 1 creates the gap
Your builder broke ground in September. On January 1, the appraisal district drove the subdivision, saw a slab and some framing, and put a value on the roll that reflected exactly that. You closed in May.
For that entire tax year, the property is taxed on what existed in January — the lot, plus whatever partial construction was standing. The builder owned it then, and builders don't carry a residence homestead exemption on inventory, so there's no exemption history on the record either.
Your lender sets up your escrow account using the tax information available at closing. If that information is the appraisal district's current, land-only figure, your escrow is funded for a bill that bears no relationship to what the house will actually be taxed at.
The following January 1, the appraisal district comes back, sees a finished home, and values it accordingly. In October, the real bill arrives. In the following escrow analysis, your servicer catches up — all at once.
This is different from the ordinary year-over-year appraisal creep every Texas homeowner deals with. This is a one-time step change, and it's built into the calendar.
Your closing date changes how long you have before it hits, not whether it hits. Close in February and you'll ride the land-only bill for nearly two full years before the finished value shows up on an October statement. Close in November and the reset is right behind you. Buyers who close early in the year tend to be the ones caught most off guard, because eighteen months of comfortable payments start to feel like the permanent number.
What year two actually costs
Here's the math on a hypothetical $500,000 finished home in the City of Rockwall, using the 2025 adopted rates for that address.
The combined rate — Rockwall ISD at $1.0669, Rockwall County at $0.2547, and the City of Rockwall at $0.2474 — comes to roughly $1.569 per $100 of value.
Year one (lot valued at $115,000): about $1,804 for the year.
Year two (finished home at $500,000, with the $140,000 school district homestead exemption in place):
| Entity | Taxable value | Rate per $100 | Tax |
|---|---|---|---|
| Rockwall ISD | $360,000 | $1.0669 | $3,841 |
| Rockwall County | $500,000 | $0.2547 | $1,274 |
| City of Rockwall | $500,000 | $0.2474 | $1,237 |
| Total | $6,352 |
That's a $4,548 increase in a single year — about $379 a month in additional escrow going forward.
Then there's the shortage. Under federal escrow rules, your servicer has to let you repay an escrow shortage over at least twelve months. So for roughly a year, you're paying the higher ongoing amount plus the catch-up — call it $750 a month more than the payment you signed for. After the shortage clears, it settles back to about $380 above your original payment.
That's the City of Rockwall, which has one of the lowest combined rates in the DFW area. Run the same house in Royse City, where the combined rate lands closer to 2.01% once you add Royse City ISD and the higher city rate, and the numbers get noticeably larger. Add a MUD or PID assessment — common in the newer eastern growth corridors — and larger still. Our guide to property taxes in Rockwall County walks through how the rates stack by city.
One more thing worth saying plainly: the tax figure showing in the appraisal district's online record for that address is not a preview of your bill. It's a snapshot of a lot that a builder happened to own on a particular day. The same goes for the tax proration the title company calculates at closing — that's a one-time credit based on the numbers available that day, not a forecast of what you'll owe.
Don't count on the 10% cap
A lot of buyers assume the homestead cap protects them here. It doesn't.
Texas Tax Code Section 23.23 limits how much a homestead's appraised value can increase year over year to 10%, but subsection (e) specifically excludes new improvements — meaning the house itself, which wasn't in last year's appraised value. On top of that, the cap doesn't kick in until the year after you've qualified for the homestead exemption.
On a new build, both exclusions apply exactly when you'd want the cap most. Plan as though it isn't there, because for this jump, it isn't.
Four moves that keep this from blindsiding you
1. Get the completed-value number before you sign
Add the base price, the lot premium, and every option you've selected. Multiply that by the combined tax rate for the specific address — not a county average. Rockwall Central Appraisal District publishes rate sheets, and the same is true for Kaufman, Collin, Hunt, and Dallas CADs, depending on where the home sits.
That's your real annual tax estimate. Two minutes of math, and it's the number your whole budget should be built on.
2. Ask your lender which figure they used to fund escrow
Ask it directly, and ask for the answer in writing: "Did you set my escrow using the appraisal district's current value, or the projected completed value?"
Then ask whether they'll fund the escrow account at the projected completed value instead. Some lenders will. Some won't. Either way, you want to know before you're sitting at the title company, not eighteen months later.
3. File your homestead exemption the week you close
Since 2022, Texas Tax Code Section 11.42(f) allows a buyer who acquires a home after January 1 to qualify for a prorated residence homestead exemption from the closing date forward — provided the previous owner didn't already claim the exemption on that property that year.
On a new build, the previous owner was the builder, and builders don't hold homestead exemptions. That means you can almost always claim the exemption in your purchase year rather than waiting until the next January. It's free, it takes minutes with your appraisal district, and it directly reduces the number your escrow has to cover. Our Rockwall County homestead exemption walkthrough covers the filing steps.
4. Read your notice of appraised value in April
Fast-growing subdivisions are exactly where appraisal district records are most likely to be wrong — completion percentage, square footage, garage configuration, whether there's a pool.
If your home genuinely wasn't complete on January 1 and the district valued it as though it were, that's a legitimate protest with a clear factual basis. Check the details the year the finished value first appears. Here's how the protest process works in Rockwall County.
None of this requires you to negotiate anything unusual. It requires you to ask two questions — one of the builder, one of the lender — before you're committed. That's it.
This is the conversation I have with every new construction buyer before we write an offer, and it's the reason my clients aren't the ones calling their servicer in confusion two Octobers later. If you're looking at a build in Rockwall County or the Northeast Dallas suburbs, our new construction buyer's guide covers what else changes when you're buying from a builder instead of a homeowner.
Frequently Asked Questions
Can I ask the builder to cover the escrow shortage?
You can ask for a closing cost or escrow funding credit as part of the contract negotiation, and in the current market builders in the eastern Rockwall County corridors have been willing to discuss concessions. What you can't do is bring it up after closing — once the contract is signed, there's nothing left to negotiate. Raise it while the terms are still open.
My lender told me my payment is fixed. Was that wrong?
Principal and interest are fixed on a fixed-rate loan. Taxes and insurance are not, and they're escrowed inside the same monthly payment. When taxes go up, the payment goes up. Only the P&I portion is locked, and it's worth confirming that distinction with your lender in writing.
Does the $140,000 homestead exemption solve this?
It helps, but only against the school district portion of your bill. Senate Bill 4, approved by voters as Proposition 13 in November 2025, raised the mandatory school district homestead exemption to $140,000 beginning with the 2026 tax year. County, city, and any MUD or PID assessments are calculated separately, and those entities set their own optional exemptions.
Is this different in Rowlett, Sachse, or Wylie?
The January 1 rule is identical statewide. What changes is the combined tax rate and which appraisal district holds the parcel. Some addresses in Rowlett and Wylie sit within more than one county, so confirm which appraisal district actually has your property before you run the math — don't assume based on the mailing address.
I bought new two years ago and I'm selling now. Does this affect me?
It can. Buyers and their agents pull the tax history, and a record showing a low land-only year followed by a full-value year invites questions about what the home really costs to own. Be ready to explain the sequence, and make sure your listing materials reflect current taxes rather than a stale figure.
New construction in Rockwall County is a good buy for a lot of people right now, and builders are still competing on rate buydowns and closing costs. The tax reset isn't a reason to avoid a new build. It's a reason to size your budget off the finished home instead of the lot.
If you're touring builder communities in Rockwall, Fate, Royse City, or Heath and you want the real carrying cost before you put money down, I'm glad to run those numbers with you. You can schedule a conversation on my calendar or call or text me directly at (972) 679-1789.
Buyers can also download our 90 Ways We Serve Buyers guide to see what we handle from first showing through closing.
Cindy Dunnican is the Founder and Managing Partner of The Dunnican Team at Coldwell Banker Apex, Realtors, serving Northeast Dallas, Rockwall County, and surrounding North Texas communities — including Rowlett, Rockwall, Heath, Wylie, Sachse, Fate, Royse City, Sunnyvale, and Caddo Mills. With 25+ years of experience, 1,850+ transactions, and recognition as a D Magazine D Best honoree every year since 2010, Cindy leads listings, marketing, and brand strategy for the team. She and her husband Cory Dunnican are both Global Luxury Certified and Real Trends Verified. Reach The Dunnican Team at 972-679-1789 or thedunnicanteam.com.
This article is general information about Texas property taxes and mortgage escrow, not tax, legal, or lending advice. Tax rates, exemption amounts, and appraised values change every year, and the figures used here are illustrative. Verify your specific situation with your county appraisal district, your lender, and a qualified tax professional.
Check out this article next
Wiring Closing Funds in Texas: How to Avoid Wire Fraud
How Do You Safely Send Closing Funds to a Texas Title Company? Call the title company at a phone number you look up yourself and…
Read Article
