How to Appeal Your Property Tax Assessment: Evidence, Deadlines and What to Expect
Assessment notices can overvalue your home, and the fix is often free. Here is how to tell whether an appeal is worth it, what evidence works and how much you could save each year.
📑 On this page ▼
📐 Verified Sep 28, 2026 against IRS Topic 503 and Publication 530 on property taxes, the Census Bureau's American Community Survey table on real estate taxes paid, and Regulation X (12 CFR 1024.17) on escrow. Appeal rules and deadlines are set locally, so check your county's. The worked example is illustrative. This is general information, not legal or tax advice. How we check numbers →
If your assessment values your home above what it would sell for, or your property record has errors, you can appeal, often for free. Deadlines are short, often 30 to 90 days after the notice. The strongest evidence is recent sales of similar homes plus proof of condition problems or record errors. A lower assessment keeps saving you money every year until the next reassessment.
Numbers That Matter
| Figure | What it says | Source | Verified |
|---|---|---|---|
| Real estate taxes paid by homeowners | Published by state and county in the American Community Survey (table B25103) | U.S. Census Bureau | Sep 28, 2026 |
| Deducting property taxes | Part of the state and local tax deduction, capped at $40,400 for 2026 if you itemize | IRS Topic 503 | Sep 28, 2026 |
| Refunds and rebates | A property tax refund can affect the amount you deduct | IRS Publication 530 | Sep 28, 2026 |
| After a reduction | Your escrow analysis should reflect the lower bill; surpluses of $50 or more are refunded | 12 CFR 1024.17 | Sep 28, 2026 |
How Your Bill Is Figured
Your tax is roughly your assessed value, times any assessment ratio your state uses, minus exemptions, times the local tax rate. You can't appeal the tax rate, which voters and local governments set, but you can challenge the value and make sure every exemption you qualify for, such as a homestead, senior, veteran or disability exemption, is applied.
When an Appeal Is Worth It
- The value is too high: recent sales of comparable homes nearby point to a lower market value.
- The record is wrong: extra square footage, bedrooms, bathrooms or a finished basement you don't have.
- Condition problems: a failing roof, foundation cracks or other issues the assessor didn't see.
- Uneven treatment: similar homes on your street are assessed noticeably lower.
How to Appeal, Step by Step
- Check the deadline on your assessment notice or the assessor's website the day it arrives.
- Pull your property record and fix factual errors first; many are corrected informally.
- Gather three to five comparable sales: similar size, age and location, sold recently.
- Document condition with dated photos and repair estimates; a recent appraisal also helps.
- File and present your case to the assessor or the local board, sticking to value evidence, not the tax bill.
- Appeal further to a state board or tax court if the result still seems wrong.
Results vary widely by place. Many counties publish appeal outcomes, so ask for last year's numbers. If you hire a consultant, they commonly take a share of the first year's savings; compare that with doing a simple case yourself.
Worked Example: A $40,000 Overassessment
- Today's bill: at a 1.5% effective rate, $450,000 of value means $6,750 a year.
- After a successful appeal: at $410,000, the bill is $6,150, saving $600 a year.
- Until the next reassessment: if the value holds for 3 years, that's about $1,800, and your escrow payment drops too.
Illustrative; your rate, assessment ratio and exemptions depend on where you live.
Decision Rules
If this, then that
- If comparable sales run well below your assessment → appeal with those sales as evidence.
- If your property record has errors → request a correction first; it may settle the issue.
- If you're missing an exemption → apply; exemptions can beat an appeal.
- If the difference is small → weigh your time; a correction may still be worth it.
- If you win → confirm your servicer updates escrow and refunds any surplus.
Mistakes to avoid
- Missing the filing deadline.
- Arguing that taxes are too high instead of that the value is wrong.
- Using listings or old sales instead of recent comparable sales.
- Overlooking homestead, senior or veteran exemptions.
- Forgetting to check that escrow reflects the lower bill.
Related: escrow shortages explained covers what tax changes do to your payment; the SALT cap covers deducting property taxes; homeowners insurance shock covers the other big escrow bill; and the real cost of homeownership covers the rest.