Assessor Services

Getting to Know the Duties of the Assessor
Office 847-945-3020
Hours 8:30-12:00 & 1:00-4:30  

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It is the Assessor’s duty to determine the market value of all property within the Township.Separate market values are required for land and building portions of the real estate. After determining the total value of the real estate, the property is assessed at one-third (33.33% of its appraised value). Assessing property at a pre-determined percentage of market value is called an assessment system. Illinois is not the only state that uses such a system.

The Assessor values all property as of January 1 of the tax year. Reassessments are mandated by statute every four years. This is known as the general assessment year. The property tax code requires the Chief County Assessment Office and the Illinois Department of Revenue to apply equalizing factors each year to maintain the 33.33% level of assessment on all properties.

PRINCIPLES THE ASSESSOR’S OFFICE FOLLOWS. The Township assessors use the same principles, techniques and methodologies as those employed by fee appraisers with only slight variations to accommodate the uniformity criteria of the United States Constitution and the Illinois Constitution.

THE ULTIMATE PURPOSE OF ASSESSED VALUE IS TO APPORTION THE TAX BURDEN. The Assessor is not responsible for deciding the tax burden. That is established by the major taxing bodies. The role of the assessment is to provide a means to divide the tax burden in a fair and equitable manner based on the value of the real estate.

THREE APPROACHES TO VALUATION. The Assessor uses three traditional approaches to appraise property: the cost approach; the market or sales comparison approach; and the income approach. These are standard methodologies in the appraisal industry. Variations in the application of these approaches are necessary because the Assessor is also required to ensure that similar properties have similar assessments. This is known as assessment uniformity.

STATISTICAL TESTING AND ASSESSMENT ANALYSIS ARE INTEGRAL PARTS. As a result, assessors rely on statistical measures much more than fee appraisers. Armed with means, medians and coefficients of dispersion, the Assessor is able to confidently appraise properties at the appropriate percentage of market value and ensure the degree of uniformity in the Township is within acceptable parameters.

THE PERSONAL TOUCH MATTERS. If you call the West Deerfield Township Assessor’s office, you’re likely to get Tom, himself, on the phone. It’s part of his office’s commitment to serve the community by being approachable. Tom remembers the days when Deerfield really was “fields” and believes that being neighborly is the only way to be. It’s a point of pride with him that his office walks people through the process and that even if someone comes in angry that generally there’s a handshake when they walk out.
•Certified Illinois Assessing Officer
•Member of Illinois Assessor’s Association
•Past President, Chairman of Education Committee of Lake County Township Assessor Association
•Real Estate Broker for 20+ years
•Lifelong Deerfield Resident


Contact our offices with questions, applications and required documentation to take advantage of all the exemptions that are available to you.
Hours: M-F 8:30 – noon / 1:00 – 4:30
Call: 847.945.3020

EXEMPTIONS: Below are some of the available exemptions. Beginning in 2020, all applications must be submitted on line and you must create a “Smartfile E-Filing Portal” account at this website:

General Homestead
is a $6,000 reduction in the assessed value of your property, if that property is your primary residence on or before January 1 of that tax year.

Senior Homestead Exemption
is a $5,000 reduction in the assessed value of your property the tax year you turn 65 years of age on your primary residence.

Senior Assessment Freeze
This exemption freezes the assessment on your property if the total household income is $65,000 or less. This is an exemption that must be renewed each year.

Senior Deferral
is a state loan with a simple interest of 6%. Repayment of this loan is due upon death or sale of house. To qualify, one must be 65 years of age as of June 1st of the tax year, have a household income under $65,000, must have proof of insurance, property taxes must be current, and the property must be your primary residence. Call the Lake County Treasurer for more information at 847-377-2323.

Disabled Persons’ Homestead Exemption
is a $2,000 reduction of the assessed value of the primary residence.


Other Exemptions available are:

 – Disabled Veteran’s Exemption up to $100,000 of the equalized assessed value is lowered

 – Returning Veteran’s Exemptions This exemption lowers the equalized assessed value by $5,000

 – Home Improvement a permit from the local municipality is required to receive this exemption

Click here for a complete list and requirements to qualify:

Any other questions? You can email

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