Property Tax Appeals

Property Tax Appeals: When and How to Fight Your Assessment

Property taxes are the largest recurring cost many homeowners pay after the mortgage, yet they're treated as fixed and immovable—an annual bill to be accepted and paid. They are neither. Assessments are made by government offices that handle thousands of properties, work from imperfect data, and make errors. The appeal process exists specifically because errors happen, and because property owners have the right to challenge an assessment they believe is inaccurate.

A successful appeal doesn't require an attorney, specialized knowledge, or confrontation. It requires understanding how assessments work, knowing what constitutes valid grounds for appeal, and presenting a factual case with supporting documentation. Homeowners who appeal and win—which happens regularly—save money every year until the next reassessment cycle.

HOW PROPERTY ASSESSMENTS WORK

Property tax is calculated by multiplying the assessed value of a property by the local tax rate (the mill rate or levy). If your home is assessed at $350,000 and the local rate is 2%, your annual property tax is $7,000.

Most jurisdictions do not assess at full market value. They assess at a fixed percentage of market value called the assessment ratio or assessment level—often 70%, 80%, or 100% depending on the jurisdiction. If your jurisdiction assesses at 80% of market value and your home is worth $400,000, the target assessed value would be $320,000.

Assessments are updated on cycles that vary by jurisdiction—annually in some, every three to five years in others. Between cycles, values often aren't updated to reflect market changes. This means a home can be assessed above or below its actual proportional value, creating legitimate grounds for appeal.

THREE VALID GROUNDS FOR APPEAL

Ground 1: The assessed value exceeds the home's actual market value.

This is the most common appeal basis. If your jurisdiction assesses at 100% of market value and your home is assessed at $425,000, but comparable homes in your neighborhood are selling for $375,000 to $395,000, your assessment is above market value. You're paying taxes on an inflated number.

Supporting evidence: Recent sales (within 6 to 12 months) of comparable properties—similar size, age, condition, and location. These are called "comps" and are the same data used by real estate agents to price homes. Zillow, Redfin, and your county assessor's database often provide this data publicly. A formal appraisal ($300 to $600) provides the strongest documentation but isn't always required.

Ground 2: Your assessment is disproportionate to comparable properties.

Even if your assessed value is close to market value, you may have grounds for appeal if your effective tax burden is higher than similarly situated neighbors. If your 1,800-square-foot home is assessed at $380,000 and identical homes on your street are assessed at $310,000 to $330,000, you're bearing a disproportionate share of the tax burden.

Supporting evidence: Assessed values of comparable properties, pulled from the county assessor's public database. Your jurisdiction's assessment ratio applied to recent sales of those properties. A pattern of higher assessment relative to peers is a legitimate appeal argument distinct from an absolute value claim.

Ground 3: Factual errors in the property record.

Assessors maintain property record cards describing the home's characteristics: square footage, number of bedrooms and bathrooms, lot size, finished basement, garage, condition rating. Errors in these records—incorrect square footage, a bedroom listed that doesn't exist, a finished basement shown when it's unfinished—directly inflate the assessed value.

Supporting evidence: Obtain a copy of your property record card from the assessor's office (public record in most jurisdictions). Compare it to your home's actual characteristics. If the record says you have 2,200 square feet and your home is 1,850 square feet, that discrepancy directly affects your assessment. Floor plans, photographs, building permit records, and your own measurements document the error.

THE APPEAL PROCESS

Step 1: Obtain your assessment notice and review it.

Most jurisdictions mail assessment notices annually or during reassessment years. The notice shows your assessed value and typically includes appeal deadline information. Deadlines are firm—missing the window forecloses your right to appeal until the next cycle.

Step 2: Pull your property record card.

Request it from the assessor's office or find it through the county's online portal. Review every field for accuracy. Square footage errors are the most common and easiest to document.

Step 3: Research comparable sales.

Using Redfin, Zillow, or the county's sales database, identify three to five properties that sold in the past 6 to 12 months that are comparable to yours in size, age, condition, and location. Record sale price, date, and key characteristics. Calculate the assessed value as a percentage of sale price for each comp. If your assessment ratio is higher, you have an argument.

Step 4: File the appeal.

Most jurisdictions offer an informal review first—a meeting or written submission to the assessor's office before a formal board hearing. This is often resolved at the informal stage without proceeding further. The informal review is free, takes 30 to 60 minutes, and sometimes produces an adjustment without the need for a hearing.

If the informal review doesn't resolve the issue, file a formal appeal with the local board of assessment review (or your jurisdiction's equivalent). The filing typically requires a form, your documentation, and in some jurisdictions a small filing fee ($25 to $75). No attorney is required, though property tax attorneys or consultants work on contingency (taking a percentage of the tax savings) for higher-value cases.

Step 5: Attend the hearing.

Board hearings are administrative proceedings, not courtrooms. Dress professionally, bring organized documentation, and present your case factually. You'll typically have 10 to 15 minutes to present. Focus on your strongest argument—comparable sales showing lower market value, or a factual error in the property record—rather than a general complaint about taxes being too high.

WHAT A SUCCESSFUL APPEAL PRODUCES

A successful appeal reduces your assessed value, which reduces your property tax bill in every subsequent year until the next reassessment. A $30,000 reduction in assessed value at a 2% tax rate saves $600 per year. Over five years between reassessments, that's $3,000 in cumulative savings.

Many homeowners who've never appealed are carrying assessments from a prior market peak that haven't been updated to reflect subsequent market changes, or they have factual errors that have compounded for years. One appeal cycle that correctly resets the assessment produces ongoing savings without repeated effort.

WHAT DOESN'T WORK AS AN APPEAL ARGUMENT

"My taxes are too high" is not an appeal argument. Property taxes are set by local government and are what they are. Appeals address the accuracy of the assessed value, not the appropriateness of the tax rate.

"My neighbor pays less than me" without documented evidence of comparable assessed values is anecdote, not evidence. Come with actual assessment data, not impressions.

"I just bought the home for less than the assessed value" is strong evidence but only if the sale was an arm's-length transaction at market conditions, not a distressed sale, short sale, or purchase from a motivated seller under unusual circumstances. A recent market-rate purchase price is among the best evidence you can present.

Presenting an appraisal that was done for your mortgage isn't always appropriate—lenders sometimes use conservative appraisals for loan purposes, and a mortgage appraisal may not reflect the same methodology as an assessment review. A dedicated tax assessment appraisal is more persuasive.

The property tax system assumes most homeowners will not appeal. That assumption benefits jurisdictions and costs homeowners. Challenging an inaccurate assessment is a legal right, not an unusual act—and it is far more commonly warranted than most homeowners realize.