Property Tax Appeal Based on Assessor Errors: Data Mistakes That Inflate Your Bill
TL;DR
Assessor errors are the easiest type of property tax appeal to win. Common mistakes include wrong square footage, incorrect room counts, nonexistent features, wrong year built, and wrong lot size. Get your property record card, compare every line to your actual property, and document any discrepancies. Errors are factual, objective, and hard for the review board to deny. One wrong data point can inflate your assessment by tens of thousands of dollars.
Common Assessor Errors
| Error Type | How It Happens | Typical Impact |
|---|---|---|
| Square footage too high | Includes unfinished space, measures incorrectly | $10,000-$50,000+ |
| Extra bedrooms/bathrooms | Counts rooms that do not meet code or do not exist | $5,000-$20,000 |
| Nonexistent features | Lists a fireplace, pool, or finished basement that does not exist | $5,000-$30,000 |
| Wrong year built | Records incorrect construction date | Varies |
| Wrong lot size | Incorrect acreage from deed or survey errors | $5,000-$25,000 |
| Wrong building type | Lists home as brick when it is frame | $5,000-$15,000 |
| Wrong condition rating | Lists "excellent" when home is "average" | $10,000-$40,000 |
How to Find Errors
Step 1: Get Your Property Record Card
Request this from the assessor's office. It shows every data point used to calculate your assessment.
Step 2: Compare to Reality
Walk through your home with the record card. Check:
- Total living area (square footage). Measure if needed.
- Number of bedrooms and bathrooms. Does each meet building code definitions?
- Garage type and size
- Basement: finished or unfinished?
- Features: pool, fireplace, deck, patio?
- Exterior: siding type, roof type
- Lot size: matches your deed or survey?
Step 3: Document the Errors
For each error, prepare documentation:
- Photos showing the actual condition or feature
- Measurements (use a tape measure and photograph the process)
- Building permits or plans showing correct specifications
- Deed or survey for lot size verification
Presenting Error-Based Appeals
Error appeals are straightforward. Present the assessor's record, highlight the errors, provide the correct information with documentation. The board has no basis to deny a factual correction.
After correcting errors, you may also want to present comparable sales data showing what the correct assessment should be. The error correction alone may not fully resolve the over-assessment.
Frequently Asked Questions
What should I know about property tax appeal based on assessor errors: data mistakes that inflate your bill?
Assessor errors are the easiest type of property tax appeal to win. Common mistakes include wrong square footage, incorrect room counts, nonexistent features, wrong year built, and wrong lot size. Get your property record card, compare every line to your actual property, and document any discrepancies.
How to Find Errors?
Request this from the assessor's office. It shows every data point used to calculate your assessment.
What should I know about presenting error-based appeals?
Error appeals are straightforward. Present the assessor's record, highlight the errors, provide the correct information with documentation. The board has no basis to deny a factual correction.
Combine Error Corrections With Market Data
Our $79 Evidence Packet provides the comparable sales analysis to complement your error documentation. Fix the data and prove the right value in one evidence package.