The online forms for filing assessment appeals are now available on the E-Filing Assessment Appeals link to the left. Please review the instructions before filing. Also be sure to read the Board of Review Rules. 

Township Publications:

Only parcels that had a "Reason for Change" other than "Equalization Factor" are being published this year. If the reason for change is Equalization Factor you will not see these parcels published in the local newspaper. You may view all assessment values for all parcel in a township by clicking on the worksheet link on the publication page of this website.

The 2016 assessments for Algonquin Township will publish in the Northwest Herald on Wednesday November 23, 2016. The final day to file an assessment appeal will be Friday December 23, 2016 the equalization factor is 1.0662.    

Mission Statement:

The Office of Assessments strives to administer an accurate, fair, uniform, and timely assessment of all real property in McHenry County in accordance with and as mandated by the Illinois Property Tax Code.

Function: It is the function of the county Office of Assessments to monitor and direct the countywide valuation of real property for the purpose of real estate taxation. This mandated function includes but is not limited to
• Provide assistance and information to the individual township assessors
• Monitor all functions for compliance with state statutes and IL Department of Revenue procedures
• Apply exemptions and preferential assessments
• Analyze sales data and conduct sales ratio studies
• Apply equalization factors
• Provide proper taxpayer notification of assessments through mailed notices and publication
• Monitor and direct an unbiased appeal procedure to assure due process
• Prepare abstracts and reports for submission to the Illinois Department of Revenue
• Timely certification of the completed assessment roll to the County Clerk in manner to facilitate timely tax calculation and billing as prescribed by statute
• Assist Board of Review in defense of decisions when appealed to the Illinois Property Tax Appeal Board
• Maintain Parcel Identification Numbering system
• Maintain an accurate county cadastral map system, including line maps, and other property & owner information, to be used by the property tax function, other county offices, other governmental offices and the public, in conjunction with the county's Geographical Information System

Functional Divisions:
Assessments: Assists with and reviews the work of the township assessors and assures compliance with state statutes as to valuation of property; applies eligible preferential assessments; conducts sales ratio studies for application of equalization factors; implements and directs the notification process through publication and direct mail. 

Board of Review: Is responsible for determination or recommendation of eligibility for certain exemptions; directs the appeal process, including hearing real estate assessment complaints, rendering decisions regarding value and defending decisions to the Illinois Property Tax Appeal Board.

Mapping: Using recorded and filed documents and in conjunction with other county offices, maintains and updates the county cadastral maps and parcel numbering system including legal description, tax code, ownership, mailing address and property location.