Tools / 01
Is Your Property
Tax Bill Wrong?
Your property tax bill starts with the county's guess at what your building is worth. Counties guess tens of thousands of buildings at a time, with a formula. Formulas miss. I built a system that reads the public records and finds the buildings they got wrong. Here's what it found.
commercial buildings are valued at double what similar buildings nearby are valued at, or more. Their owners likely overpay property tax every single year, across the 187 counties read so far. Most have no idea, and almost none ever challenge the bill.
Where I've looked so far
Darker green means more buildings that look overvalued. Tap a state to see its counties. Gray states are next.
What about your county?
Showing the biggest counts first. 187 counties are searchable.
What being overvalued costs
Three warehouses on the same kind of street, doing the same kind of work. Two pay normal tax. One pays triple, roughly $65,000 a year extra, because the county's formula missed. That one is a real building in Greene County, Missouri. Its owner found out when I emailed him.
Check your property
Type your address. If your building looks overvalued next to similar buildings in your county, you'll see exactly where it stands. If it's not on the list, I'll check it by hand and email you what I find.
187 counties · 94,557 buildings indexed from public records.
Most buildings are valued fairly. These aren't.
953,238 commercial buildings checked. 803,229 are valued about right. Drag the line to explore the ones that aren't.
Counts at 1.75x and above are real buildings from county records. The shape of the left hump is illustrative, its total is real. A high number is a reason to look, not proof of an error, which is exactly why the look should be free.
Real buildings, anonymized
Method, honestly
Every commercial building compared to the typical value per square foot of similar buildings in the same county, straight from the county's own public records. 'Looks overvalued' means valued at double that norm or more. Dollar figures assume a conservative 1.5% effective tax rate on the excess. A screen, not an appraisal. Some gaps have good explanations. A renovation, a recent sale, a better building. The screen's job is to find the parcels worth a closer look, not to promise every flag is an error. Dataset generated 2026-07-07 from county public records.
Own commercial property and want to know where you sit against your county's data? Send me the address and I'll run it. Free, same day, and if your assessment is fair I'll tell you that.