Millions of homeowners are overassessed — and most never challenge it. National studies estimate that 30-60% of properties are assessed above market value, yet fewer than 5% of homeowners file appeals. Those who do appeal succeed roughly half the time, with average savings of $1,000-$3,000 annually.
Property tax appeals are free to file, don't require a lawyer, and take a few hours of preparation. Here's exactly how to determine if you're overassessed and win your appeal.
Are You Overassessed? How to Tell
Check 1: Compare Assessment to Market Value
- Find your assessed value on your tax notice or assessor's website
- Look up recent sales (last 6-12 months) of similar homes in your neighborhood
- If your assessment exceeds what comparable homes actually sold for, you have grounds to appeal
Check 2: Look for Assessment Errors
Common errors that inflate assessments:
- Incorrect square footage (bigger than actual)
- Wrong number of bedrooms/bathrooms
- Listed features you don't have (finished basement, pool, garage)
- Incorrect lot size
- Wrong construction type or quality grade
- Failed to account for damage or needed repairs
Check 3: Compare to Neighbors
Most assessor websites let you look up any property. Check similar homes on your street:
- Are comparable homes assessed significantly lower?
- Were similar homes recently reassessed downward?
- Is there an obvious pattern of over-assessment on your block?
The Appeal Process (General Framework)
Most jurisdictions follow this structure:
Level 1: Informal Review
- Contact assessor's office to discuss your concerns
- Present evidence of overvaluation
- Many reductions happen at this stage without a formal hearing
- Free, fast, and low-effort
Level 2: Formal Appeal to Board of Review/Equalization
- File a written appeal within the deadline
- Present evidence at a hearing (usually 10-15 minutes)
- Board reviews and issues a decision
- Free in most jurisdictions
Level 3: State Tax Court/Further Appeal
- If the board denies your appeal, most states allow further appeal
- May involve tax court or state assessment board
- Attorney or consultant may be helpful at this stage
Evidence That Wins Appeals
Comparable Sales (Most Important)
Find 3-5 comparable properties that sold recently for less than your assessed value:
- Same neighborhood (within 1 mile ideally)
- Similar size (within 10-20% of square footage)
- Similar age and condition
- Sold within last 6-12 months
- Sold for less than your current assessment
Where to find comps: Zillow, Redfin, Realtor.com (sold listings), county recorder's office, or ask a real estate agent for a CMA (comparative market analysis — many will provide one free hoping for future business).
Property Condition Issues
Document anything that reduces your home's value:
- Foundation problems
- Roof damage or age
- Outdated systems (plumbing, electrical, HVAC)
- Environmental issues (flood zone, noise, contamination)
- Needed repairs with contractor estimates
- Photos showing deterioration
Assessment Errors
If your property record card contains errors:
- Print the record from the assessor's website
- Mark each error clearly
- Provide correct information with supporting evidence
- Errors alone can reduce assessment by 10-20%
Step-by-Step Filing Guide
Step 1: Get Your Assessment Notice
- Note the deadline for filing an appeal (typically on the notice)
- Review the assessed value and property details
- Compare to your estimate of fair market value
Step 2: Visit the Assessor's Office (Informal Review)
- Bring your evidence (comps, photos, error documentation)
- Be polite and factual
- Ask: "Based on these comparable sales, can we discuss adjusting my assessment?"
- If they agree to reduce, get it in writing
Step 3: File Formal Appeal If Informal Fails
- Complete the appeal form (available from assessor's office or website)
- Include: property address, current assessment, your opinion of value, and why
- Attach all supporting evidence
- File before the deadline (late filings are typically rejected)
Step 4: Prepare for the Hearing
- Organize evidence clearly (labeled comps, property photos, error documentation)
- Prepare a brief verbal presentation (5 minutes)
- Focus on facts, not opinions or emotions
- Bring extra copies of everything for board members
Step 5: Attend the Hearing
- Present your case concisely
- Lead with your strongest comparable sale
- Show the gap between comps and your assessment
- Answer questions directly
- Board typically decides within 30 days
Quick Checklist
- [ ] Checked assessment notice for deadline
- [ ] Compared assessment to recent comparable sales
- [ ] Reviewed property record card for errors
- [ ] Gathered 3-5 comparable sales below my assessment
- [ ] Documented property condition issues
- [ ] Attempted informal review with assessor
- [ ] Filed formal appeal before deadline
- [ ] Organized evidence package for hearing
Bottom Line
Property tax appeals are one of the most overlooked money-saving opportunities for homeowners. The process is free, takes a few hours, and succeeds in 30-50% of cases. Even modest reductions compound over years of ownership. If comparable homes are selling for less than your assessed value, you likely have a strong case worth pursuing.
Sources
- IAAO Assessment Standards: https://www.iaao.org/
- National Taxpayers Union Foundation: https://www.ntu.org/foundation/
