$ PlainPropertyTax

Property tax guide

How to Appeal Your Property Tax Assessment

To appeal a property tax assessment, homeowners typically file within 30-90 days of the assessment notice, gather comparable sales or an independent appraisal as evidence, and present the case to a local review board. A reduction in assessed value cuts the annual bill by the same proportion, since the bill is the assessed value multiplied by the local rate.

Across the 3,137 counties with 2024 data in the U.S. Census Bureau's American Community Survey, the average county's median property-tax bill is $1,993 a year, or $3,691 once counties are weighted by the number of homes each one holds. The county medians are the Bureau's; the averaging is ours. If your assessment runs high relative to comparable sales, an appeal can lower it. See our methodology.

Whether a local comparison exists at all

Counties inside the same state can charge very different effective rates: Wisconsin spans 0.73% to 3.56% across its 72 counties, while Wyoming varies by only 0.24% end to end.

2.83%
widest within-state spread (Wisconsin)
0.24%
narrowest (Wyoming)
48
states with enough counties to compare

Source: U.S. Census Bureau ACS 2024, county effective rates. A wide spread means comparable property nearby may be assessed very differently; it is not itself evidence that any one assessment is wrong.

Where county rates vary most inside one state

Highest minus lowest county effective rate, ACS 2024

percentage points

What this shows A wide spread tells you the local comparison is worth making before you file. It reflects genuine differences in local levies and assessment practice as much as anything about an individual property.

Source U.S. Census Bureau, ACS 5-Year Estimates As of 2024

Should You Appeal?

Before starting the appeal process, determine if you have a case. You likely have grounds to appeal if:

  • Your assessed value is higher than comparable homes in your area
  • Your property has defects or issues not reflected in the assessment (foundation problems, outdated systems)
  • The assessment contains errors (wrong square footage, extra bedroom counted, incorrect lot size)
  • Home values in your area have declined since the last assessment

This ACS extract does not store how often assessments are reduced on appeal. Comparable sales and property-record errors are the evidence boards typically ask for; the filing deadline is the one this page can name from the jurisdiction's published notice.

Step 1: Get Your Assessment Notice

Your county assessor sends an annual notice showing your property's assessed value. Review it carefully for errors in:

  • Square footage (most common error)
  • Number of bedrooms and bathrooms
  • Lot size
  • Year built
  • Property class (residential vs. commercial)

Step 2: Research Comparable Sales

Find 3-5 recent sales of comparable homes in your area. "Comparable" means similar size, age, condition, and location. You can find this data through:

  • Your county assessor's website (many have online property records)
  • Real estate websites (Zillow, Redfin, Realtor.com sold listings)
  • Your local MLS (ask a real estate agent)

If comparable homes sold for less than your assessed value, that's strong evidence for a reduction.

Step 3: File Your Appeal

Most counties have a specific window for appeals (typically 30-90 days after receiving your assessment notice). The process usually involves:

  1. Filing a form with your county assessor or Board of Equalization
  2. Paying a small filing fee (usually $25-$50, often refunded if you win)
  3. Submitting your evidence (comparable sales, photos, inspection reports)

Important: Do not miss the deadline. Late appeals are almost never accepted.

Step 4: Present Your Case

You may have an informal review with the assessor first (recommended, many cases are resolved here). If not resolved, you'll present to a review board. Tips:

  • Be organized: Bring copies of all evidence for each board member
  • Be specific: Focus on comparable sales and factual errors
  • Be professional: Emotional arguments about affordability are less effective than data
  • Know your number: State what you believe the correct assessed value should be

Common Exemptions to Check

Before appealing, make sure you're receiving all exemptions you qualify for:

  • Homestead exemption: Available in most states for your primary residence
  • Senior citizen exemption: Age-based reductions (usually 65+)
  • Veteran exemption: For qualifying military service
  • Disability exemption: For qualifying disabilities
  • Agricultural exemption: For qualifying farm or ranch land

Check your county's tax data: Browse by state · Tax estimator

Build the comparison before you file

Appeals succeed on evidence that comparable property nearby is assessed differently, not on the size of the bill.

County effective rates are computed from ACS medians and describe a county, not a single assessment. Deadlines, evidence rules and appeal bodies are set locally, confirm with your assessor before relying on any of this.

PlainPropertyTax is rendered directly from the U.S. Census Bureau's American Community Survey (ACS) 5-year estimates, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-08-26.