After the mortgage, property tax is often the largest ongoing cost of owning a home — and unlike the mortgage, it's based on a number that a county employee estimated and that is wrong surprisingly often. Estimates suggest that somewhere between 30% and 60% of homes are over-assessed, yet fewer than 5% of owners ever appeal. That gap is free money left on the table, because appealing is cheap, low-risk, and works more often than people expect.
Why it's worth doing
Three facts make an appeal a rare no-brainer:
- It's free (or nearly). Filing an appeal yourself typically costs nothing to a small fee. You don't need a lawyer or a paid service for a straightforward residential case.
- It usually can't backfire. In most states, an appeal cannot raise your assessment — the worst realistic outcome is that it stays the same. (Confirm this for your jurisdiction, but it's the norm.)
- It works. Research from the Lincoln Institute of Land Policy finds that owners who appeal win reductions roughly 40% to 60% of the time. Those are excellent odds for a free filing.
How assessments work
Your property tax is your assessed value multiplied by a tax rate (millage) set by local governments. You generally can't fight the rate — that's set by budgets and votes — but you can challenge the assessed value, which is the assessor's estimate of your home's worth. If that estimate is too high, every year's tax bill is too high until you correct it. Assessors value thousands of homes with mass appraisal models, not individual inspections, so errors and overshoots are common — especially after fast run-ups in home prices, when assessments race to catch up and sometimes overshoot.
Step one: find your deadline
This is the step that quietly defeats most would-be appeals. Your appeal window is short and strict, printed on the assessment notice you receive, and it varies enormously by jurisdiction — often 30 to 45 days after the notice is mailed, sometimes less. Miss it and you forfeit the right to appeal for the entire cycle, usually a full year. The moment your assessment notice arrives, find the deadline and put it on the calendar — everything else can follow, but only if you're inside the window.
Step two: build the case
Two kinds of evidence win property tax appeals, and the first is often overlooked.
Start by pulling your property record card and checking it for outright mistakes — assessors hold physical data on your home that is sometimes simply wrong, and a factual error is the cleanest possible win. Then assemble comparable sales: recent sales of homes like yours that closed below your assessed value. Photos of any condition problems (a dated kitchen, deferred repairs, a busy road) and repair estimates strengthen the package.
Step three: file and present
File the appeal form before the deadline — most jurisdictions now allow online filing. Many offer an informal review with the assessor's office first, where a clear packet of comps and documented errors often resolves the matter without a hearing. If it proceeds to a formal hearing before a board of equalization or appeals, present calmly: lead with your strongest comps, show any record-card errors, and state the value you believe is correct. You're not arguing that taxes are too high in general — only that this assessed value exceeds what the home would sell for. Keep it factual and evidence-based.
The payoff
$500,000 assessment, ~1.2% effective tax rate
A few hundred dollars a year may not sound dramatic, but it recurs, often for several years, and it costs almost nothing to win. Measured as return on the hour or two it takes, a successful property tax appeal is one of the highest-value tasks in all of homeownership.
Don't forget exemptions
Separate from appealing your value, make sure you're claiming every exemption you qualify for — these lower your taxable value before the rate is applied, and they stack with an appeal. The common ones include a homestead exemption for your primary residence, plus exemptions for seniors, veterans, and people with disabilities. Many owners never file for the exemptions they're entitled to, leaving guaranteed savings unclaimed. Check your assessor's website for the full list and deadlines, claim what applies, and combine it with an assessment appeal for the largest possible reduction. Because property taxes flow into your escrow account, every dollar you save here lowers your monthly mortgage payment too.
Frequently asked questions
Is it worth appealing my property tax assessment?
Usually yes. Filing is free or nearly free, in most states an appeal can't raise your assessment, and appeals win a reduction roughly 40–60% of the time. Given that a large share of homes are over-assessed and the savings recur for years, it's one of the highest-value tasks in homeownership.
What evidence do I need to appeal my property taxes?
Two things win appeals: errors on your property record card (wrong square footage, bed/bath count, lot size — request the card and check every line), and comparable sales — 3 to 5 similar homes nearby that sold in the last 6–12 months for less than your assessed value. Photos of condition issues help too.
Can appealing my property taxes make them go up?
In most states, no — an appeal generally cannot increase your assessment, so the worst realistic outcome is that it stays the same. Confirm the rule in your jurisdiction, but it's the norm, which is part of why appealing is such a low-risk move.
What is the deadline to appeal my property tax assessment?
It's short, strict, and printed on your assessment notice — often 30 to 45 days after the notice is mailed, though it varies widely by jurisdiction. Missing it forfeits your right to appeal for the whole cycle, usually a year, so find the date the moment your notice arrives.
How much can I save by appealing my property taxes?
It depends on your assessment and tax rate, but a 10% reduction on a $500,000 home at a 1.2% rate saves about $600 a year — and reductions often hold for several years, so the total can exceed $1,800 for a free filing. Claiming exemptions on top increases the savings further.
Mortgage Ledger publishes educational information, not personalized financial, legal, tax, lending, or investment advice. The figures here are estimates built on stated assumptions and will not match a lender’s underwriting exactly. Confirm any number that matters against your Loan Estimate and a licensed professional before you act on it.