What Is Notice of Assessment?

An official document from the county assessor informing a property owner of their property's assessed value for the upcoming tax year.

Detailed Explanation

The notice of assessment is the document your county sends to inform you of your property's assessed value for the upcoming tax year. It goes by different names in different states. In Texas, it is the Notice of Appraised Value. In Florida, it is the TRIM (Truth in Millage) notice. In New York, some jurisdictions publish a tentative assessment roll. Regardless of the name, this document is the starting gun for the appeal process. When you receive it, check these items carefully: the property description (square footage, lot size, number of bedrooms and bathrooms), the assessed or appraised value compared to last year, any exemptions applied (homestead, senior, disability), and the appeal deadline and instructions. Errors in the property description are more common than you might expect. If the county has your home listed at 2,400 square feet when it is actually 2,100 square feet, that alone could inflate your value by tens of thousands of dollars. Similarly, check whether the county has accurately recorded your home's condition. A home that needs significant repairs should not be valued the same as a recently renovated property. If you believe the value is too high, the notice itself will tell you how and when to file an appeal. Do not ignore the notice or assume the county is correct. This is your annual opportunity to ensure you are not overpaying.

How It Varies by State

TexasNotice of Appraised Value (April-May)

Mailed when value changes or a new exemption is applied. Includes property details, appraised value, and protest instructions. 30-day protest window.

FloridaTRIM Notice (August)

Shows just value, assessed value, exemptions, and proposed taxes from all taxing authorities. 25-day appeal window.

New YorkTentative Assessment Roll (May)

Published by assessor. Grievance Day allows property owners to file formal challenges.

IllinoisAssessment Notice (varies by county)

Mailed when township reassessment occurs. Cook County provides online lookup of assessment changes.

Common Misconceptions

Myth:If I did not receive a notice, my value did not change

Reality:Some states only mail notices when values change. Others publish the roll online. Check your county assessor's website annually even if you do not receive a physical notice.

Myth:The notice is the same as my tax bill

Reality:The notice shows the assessed value. The tax bill, which comes later, shows the actual amount you owe after all rates and exemptions are applied.

Myth:The property details on the notice must be accurate

Reality:Data errors are common. Always verify the square footage, lot size, bedroom/bathroom count, and property class listed on your notice against your actual property.

Impact on Your Tax Bill

If your notice shows 2,400 square feet but your home is actually 2,100 square feet, that 300 square feet of error could inflate your value by $30,000 to $60,000 depending on your market. In a state with 2% effective tax rate, that translates to $600 to $1,200 per year in excess taxes from a simple data error.

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