Your county assessor probably mailed you something in the last few months that looks like junk mail.
That envelope often contains a notice of assessed value, and the number inside it quietly determines your property tax bill for the next year — sometimes for several years if your area only reassesses on a cycle.
Most people open it, see a figure that looks roughly like their home's value, and toss it.
That's a mistake worth hundreds or thousands of dollars, depending on where you live.
Assessments are based on mass appraisal — a formula applied to whole neighborhoods using recent sales data.
That process is fast and cheap for the county.
It is also frequently wrong in your favor only if you never check.
If the assessor's data has your home listed as four bedrooms when it has three, or counted a finished basement that flooded in 2019 and was never rebuilt, your bill is inflated.
In many states and counties you get 30 to 90 days from the notice date, and the deadline does not move.
Miss it and you generally wait a full year — or longer — for the next shot.
Some jurisdictions let you appeal any time until the next assessment, but plenty do not.
Here's the part that surprises people: you don't need a lawyer, and you usually don't need one of those mail-order "property tax reduction" firms that charge a big cut of your savings.
Most counties accept appeals filed by the homeowner directly, online or by mail.
Pull the assessor's own record for your property and look for errors — square footage, lot size, bedroom and bathroom count, year built, condition.
Then find three to five comparable homes nearby that sold recently for less than your assessed value, ideally similar age and size.
Zillow estimates and your neighbor's opinion carry no weight.
Closed sales and the assessor's own data do.
A cracked foundation, a busy road at the property line, a shared driveway, or a roof that needs replacing are all legitimate reasons your home is worth less than the county thinks.
Bring pictures, repair estimates, and any inspection reports you have.
Timing also matters for a different reason.
Home values climbed fast in many markets through 2021 and 2022, and assessments often lag by a year or two.
That means some homeowners are now getting notices based on peak prices while the local market has cooled.
If comparable sales in your neighborhood have slipped, that gap is your argument.
Rising commercial and multifamily assessments get passed through in rent increases more often than landlords admit, and in some states renters can weigh in at public hearings on budget and rate proposals.
One more thing worth checking: exemptions.
Homestead, senior, veteran, disability, and sometimes solar or agricultural exemptions can cut a bill substantially, and many require you to apply rather than being granted automatically.
A surprising number of eligible homeowners never file.
A successful appeal that shaves $30,000 off your assessed value might save $300 to $600 a year in a typical tax rate — and that savings compounds every year until values are reassessed again.
Final Thoughts
The letter is free to read and cheap to act on.