Property tax notices are landing in mailboxes this month, and a lot of homeowners are doing the same double-take: the assessed value went up even though the house next door just sold for less.
In some metro areas, county assessors raised values by 20% to 40% during the pandemic-era housing boom, and those higher numbers are only now hitting tax bills.
Your tax bill isn't just your value times a rate.
It's your value, divided by the total value of every taxable property in the county, multiplied by whatever the local budget says it needs.
So even if your assessment is fair, your bill can climb because your town's budget grew, a big employer's property got a tax break, or new construction shifted the math.
The good news: assessments are the most appealable part of the whole system, and the deadline is usually short — often 30 to 90 days from the notice date.
Miss it and you generally have to wait a full year.
What actually works, according to county appeal boards and tax attorneys who do this daily: Pull comps from your assessor's own website, not just Zillow.
You want three to five recently sold homes that are similar in size, age, and condition, and ideally that sold for less than your assessed value.
Sales from the last 12 months carry the most weight.
Check your property record card for errors.
Square footage off by 200 feet, a pool you don't have, a finished basement that's actually unfinished, the wrong number of bathrooms — these are common, and fixing them is the easiest win.
Look at the assessment date, not the sale date.
If your market peaked in mid-2022 and has since cooled, sales from that peak may not reflect the legally required date.
File the appeal the way your county requires.
Some want a form, some want a written letter, some now take online submissions.
Attach photos, your comps, and a one-page summary.
You don't need a lawyer for a residential appeal — most homeowners who win do it themselves.
If you miss the deadline, there's a second path: many states let you challenge the tax rate or the budget at a public hearing, usually in late summer or fall.
It's a slower fight, but it's the one that affects everyone.
Seniors, veterans, and disabled homeowners should also check for exemptions they may not be claiming.
In states like Texas, Florida, and Illinois, these can knock thousands off a taxable value, and some are automatic only if you apply once.
One more thing worth doing: compare your bill to your neighbor's.
Assessment records are public in nearly every county, usually searchable online.
If a nearly identical house down the street is assessed 15% lower, that's your strongest evidence, and it costs nothing to pull.
Our take: appealing feels intimidating, but the process is designed to be done by regular people with a folder of paperwork, and the downside is usually just the time spent.
A successful appeal can save several hundred to a few thousand dollars a year, and in most places that savings sticks until the next reassessment.
Final Thoughts
Check the deadline on your notice this week — it's the one date in this whole mess you can't negotiate.