How to Appeal Your Property Tax Assessment (Step-by-Step Guide)

Why You Should Consider Appealing

Studies consistently show that 30–60% of all properties in the US are over-assessed, meaning their taxable value is higher than their actual market value. Yet fewer than 5% of homeowners ever challenge their assessment. If your property tax bill feels too high, you're probably right—and the process to appeal is simpler than most people think.

A successful appeal can reduce your annual tax bill by hundreds or even thousands of dollars, permanently, until your next reassessment.

Step 1: Understand Your Assessment Notice

Every year (or every few years, depending on your county), you receive a Notice of Assessment in the mail. This document shows:

• Assessed value — the taxable value your county assigned to your property
• Market value — the county's estimate of what your home would sell for
• Appeal deadline — typically 30–90 days from the notice date

Mark the appeal deadline on your calendar immediately. Missing it means waiting another full year.

Step 2: Gather Your Evidence

The strongest appeal arguments are based on comparable sales (called "comps"). You need to show the county assessed your home at more than it's worth.

How to find comps

• Search Zillow, Redfin, or Realtor.com for homes sold in your neighborhood in the last 6–12 months
• Look for homes similar in size (within 10–15%), age, and condition to yours
• If 3–5 comparable homes sold for less than your assessed value, you have a strong case

Other evidence that helps

• A recent appraisal (most compelling but costs $300–500)
• Photos of damage, needed repairs, or deferred maintenance
• Evidence of errors — wrong square footage, extra bedroom the county lists but doesn't exist, etc.

Step 3: File Your Appeal

Every county has its own process, but the general steps are:

1. Download the appeal form from your county assessor's website
2. Fill it out with your evidence (comps, appraisal, error documentation)
3. Submit before the deadline — online, by mail, or in person depending on your county
4. Pay any filing fee (usually $0–$50; many counties are free)

You can find your county's appeal process by searching "[your county name] property tax appeal" — look for the official .gov website.

Step 4: Attend Your Hearing

Most appeals result in an informal hearing with a county board member or appraiser. This is not a courtroom — it's a conversation. Tips:

• Bring printed copies of all your comps
• Be specific: "Comparable home at 123 Main St sold for $280,000 in August. My assessed value is $315,000."
• Don't argue about the tax rate — only the assessed value is appealable at this stage
• If declined, you can usually escalate to a formal board of review or tax court

What Results Can You Expect?

Success rates vary widely by county, but homeowners who file appeals with evidence win full or partial reductions roughly 50–70% of the time. The average reduction is 10–20% of assessed value.

On a home assessed at $400,000 with a 1.5% tax rate, a 15% reduction saves you $900 per year — and the savings compound every year until your next reassessment.

Informal vs. Formal Appeal

Consider a Property Tax Consultant

If your potential savings are over $1,000/year and you don't want to handle it yourself, property tax consultants work on contingency — they take 30–50% of your first year's savings, so you pay nothing upfront. For large commercial properties, this is often the best path.

Key Deadlines by State

Appeal windows are strict and non-negotiable. Here are deadlines for major states:

• California: July 2 – September 15
• Texas: May 1 – June 1 (or 30 days after notice)
• New York: Varies by municipality (usually March–April)
• Florida: 25 days after the TRIM notice (August–September)
• Illinois: Varies by county (Cook County: 30 days after assessment)

Check your county assessor's website for the exact date in your area.