Home values in many markets have stalled or slipped.
Across the country, county assessors are sending out notices based on sales data from one to three years ago — back when bidding wars were common and prices were still climbing.
In places like Texas, Florida, and parts of the Midwest, assessments are catching up to that peak even as the market has cooled.
The result: homeowners who bought near the top, or who simply stayed put, are opening envelopes with numbers that feel disconnected from what Zillow or a neighbor's recent sale suggests. **Why assessments lag** Assessors don't watch the market in real time.
They work on cycles — often every one to three years — and they rely on sales from a "study period" that can be 18 months old or older.
In a falling one, it can leave you paying taxes on a value your house no longer commands.
There's also the matter of what actually changed.
Many states cap annual increases — California's Prop 13 limits them to 2%, and Florida has a 10% cap for non-homestead properties — but those caps apply to the assessed value, not the tax rate.
If your local government raises its millage rate to cover school budgets or pension shortfalls, your bill can rise even when your assessment holds steady. **The new construction trap** New construction and recent renovations are the loudest triggers for a jump.
Counties often reassess a property right after a sale or a permitted improvement, which is why new buyers frequently get sticker shock a year after closing.
The previous owner's tax bill is a poor guide to your own. **What actually works** You can appeal — and plenty of people win.
But the window is short, often 30 to 90 days from the notice date, and roughly half of homeowners never file.
If you do, bring evidence: recent comparable sales, an independent appraisal, or photos of defects the assessor may have missed.
A successful appeal doesn't just lower this year's bill; it resets the baseline for future increases.
A few more things worth knowing: exemptions for homesteads, seniors, veterans, and disabled residents go unclaimed every year because people don't know they exist.
And if you escrow your taxes, a spike doesn't just raise your monthly payment — it can trigger an escrow shortage you'll repay over 12 months, which is why some homeowners see their payment jump by hundreds of dollars even when their mortgage rate never changed. **The opinion** Nobody at the county is trying to trick you, but the system is built to run on autopilot, and autopilot favors the tax collector.
If you got a notice this year, read it, check the deadline, and consider whether the number matches reality.
Final Thoughts
The worst outcome isn't a denied appeal — it's never asking.