Why Appeals Work

County assessors value hundreds of thousands of properties using mass appraisal techniques. Errors are common. Studies show 30-60% of residential assessments contain inaccuracies that favor the taxing authority.

The appeal success rate averages 30-40% nationally, with average reductions of 10-15% on the assessed value. On a $400,000 assessment at a 1.1% tax rate, a 10% reduction saves $440/year — every year until the next reassessment.

When to Appeal

Strong Cases

  • Your assessed value exceeds your actual purchase price (if recently purchased)
  • Comparable recent sales in your neighborhood are lower than your assessment
  • Your home has physical deficiencies not reflected in the assessment (outdated systems, needed repairs)
  • You can document errors in the assessment record (wrong square footage, wrong number of bedrooms/bathrooms, incorrect lot size)
  • Market values in your area have declined since the last assessment

Weak Cases

  • You simply think your taxes are too high (opinion isn’t evidence)
  • Your neighbors pay less (their assessment may reflect different property characteristics)
  • You can’t provide comparable sales data
  • You just completed improvements that increased value (the assessor may catch this)

The Appeal Process

Step 1: Review Your Assessment (Free)

Get a copy of your property record card from the county assessor. Check for:

  • Square footage errors
  • Incorrect room count or features
  • Wrong construction type or condition rating
  • Lot size errors
  • Missing information about condition issues

Data errors are the easiest wins. If your home is recorded as 2,400 sq ft but is actually 2,100 sq ft, that alone may justify a 10-15% reduction.

Step 2: Gather Comparable Sales

Find 3-5 recent sales (within 6-12 months) of similar homes in your immediate area that sold for less than your assessed value. Same neighborhood, similar size, age, and condition.

Sources:

  • County recorder/auditor website (free)
  • Zillow/Redfin sold data (free, but verify against county records)
  • Your real estate agent (if you have one)

Step 3: File the Appeal (Usually Free)

Most jurisdictions have a deadline — typically 30-90 days after assessment notices are mailed. Filing is usually free or costs a nominal fee ($25-$50).

You’ll need:

  • The appeal form (available from your county assessor or Board of Review)
  • Your evidence packet (comps, photos, assessment errors)
  • Sometimes a written narrative explaining your case

Step 4: The Hearing

Most informal hearings take 15-30 minutes. Present your evidence clearly:

  1. State your assessed value
  2. Present your comparable sales showing lower values
  3. Point out any data errors in your assessment
  4. State the value you believe is correct

Be respectful and factual. Assessors aren’t the enemy — they’re applying a system that sometimes produces errors.

Step 5: Accept or Escalate

If the informal hearing doesn’t produce a satisfactory result, most states allow a formal appeal to a Board of Tax Appeals or state tax tribunal. At this stage, consider hiring a property tax attorney or appraiser ($300-$1,000), as the formal process has stricter evidence standards.

Professional Help

Property tax appeal firms work on contingency — they take 25-50% of your first year’s savings. This makes sense for:

  • High-value properties ($500,000+) where the potential savings justify the fee
  • Complex commercial properties
  • Areas with complicated assessment methodologies

For most homeowners, self-filing with good comparable sales data is sufficient and free.

Ongoing Strategy

  1. Check your assessment annually — even in states with infrequent reassessments, you should know your assessed value
  2. Keep a file of comparable sales throughout the year
  3. Photograph condition issues that affect value (don’t fix everything before the assessor visits)
  4. File homestead exemptions immediately after purchase (many states don’t apply them automatically)
  5. Don’t over-improve without understanding the assessment impact — permits for additions and renovations trigger reassessment in many jurisdictions

HomeStats shows effective property tax rates for every state. If your rate seems high, the appeal process is one of the highest-ROI financial actions a homeowner can take.