Here is a thing that happens constantly in Dallas–Fort Worth, and almost nobody warns buyers about it.
Two houses. Same square footage, same year built, same price. One is four minutes from the other. And the monthly cost of owning them differs by hundreds of dollars — before you have compared a single loan.
It isn't the mortgage. It's everything stacked on top of it.
Texas made a trade, and you pay for it monthly
Texas has no state income tax. That money has to come from somewhere, and where it comes from is property. So Texas leans on property taxes harder than most states, which means the tax line on your payment is doing more work here than it would almost anywhere else you have lived.
Your total tax rate is not one number set by one authority. It is a stack: county, city, school district, community college, hospital district, sometimes a utility district on top. Each sets its own rate. Cross a boundary and the stack changes, even though the house didn't.
This is why the number that matters is not the home price. It's the payment. And the payment is not knowable until someone looks up the actual parcel.
The arithmetic, so you can do it yourself
Take the assessed value, subtract your exemptions, multiply by the combined tax rate, divide by twelve. That's your monthly tax cost.
On a $500,000 home, a one-percentage-point difference in the combined rate is about $417 a month. Not a rounding error — that is a real difference in what you can afford, produced entirely by which side of a line the house sits on.
Run that before you fall in love with the house, not after.
MUDs and PIDs: the two that surprise people
In newer North Dallas communities, there is often another layer. Two of them exist and they are not the same thing, though people use the words interchangeably.
A MUD is a utility district
A Municipal Utility District funded the water, sewer and drainage infrastructure for a development the city didn't build. It levies its own tax rate on top of everything else. Two things worth knowing: residents elect the MUD board, so you get a vote, and the rate often falls over time as the original bonds are paid down. A high MUD rate today is not necessarily a high MUD rate in fifteen years.
A PID is an assessment
A Public Improvement District paid for enhancements — landscaping, entry monuments, trails, sometimes streets. It shows up as a separate assessment on your tax bill. It is not an HOA fee, it is not optional, and it commonly runs twenty to thirty years. Unlike a MUD, a PID is city-controlled; you don't elect anybody.
Texas takes PID disclosure seriously. If a seller fails to give you the required notice, you have a statutory right to terminate the contract. Which tells you how often buyers have been blindsided by one.
Neither a MUD nor a PID is automatically bad. They are how amenities in a master-planned community got financed, and you are buying the amenities. What is bad is finding out at closing.
Your first-year tax bill is lying to you
This is the one that catches even repeat buyers, and it is the single most useful thing on this page.
When you buy a home in a new community, the first tax bill is often calculated on land value only — because when the appraisal district set that value on January 1, your house didn't exist yet. The escrow estimate built from that bill is therefore too low. Next year the house gets assessed, the bill jumps, your escrow account comes up short, and you owe both the shortfall and a higher monthly payment.
Nobody did anything wrong. The math simply caught up. But it is a brutal surprise if you budgeted around year one, and it is entirely predictable if someone tells you in advance.
Exemptions: file, and know what they don't do yet
The Texas residence homestead exemption removes $140,000 of your home's value from school-district taxation as of 2026 — raised from $100,000 by Senate Bill 4 and the constitutional amendment voters approved. Homeowners 65 or older, and those with a qualifying disability, get an additional $60,000 on top.
Texas also caps how fast the assessed value of a homesteaded property can rise, at 10% a year under Tax Code §23.23. In an appreciating market that cap is worth real money.
Here is the catch nobody mentions: the cap does not protect you in your first year. Your exemption has to have been active on January 1 of the prior year before the cap kicks in. So a buyer closing this year is exposed to the full market increase on the next assessment, and only gets the cap the year after that.
File for the exemption as soon as you own and occupy the home. Don't wait for a deadline you half-remember — Texas changed the rules in 2022 and you can file during the year you qualify. It costs nothing and people forget for years.
What to actually do
- Get the tax rate for the specific parcel, not the city average.
- Ask directly whether the property is in a MUD, a PID, or both.
- On new construction, ask what the assessment will look like once the house is on the roll — not what this year's bill says.
- File your homestead exemption the moment you're eligible.
- Compare two homes by payment, never by price.
None of this is exotic. It is just tedious, and it is the kind of tedious that is worth several hundred dollars a month for as long as you own the house. If you want, send me two addresses and I'll price both properly before you decide.