Message From Your Assessor, Mary Mahady


The 2021 tax bills have been delivered. Please remember that because we have a system that pays taxes in arrears, the value you are seeing is based on January 2021. I realize that there may be questions about the value and/ or the taxes, so as I have done in the past, I will be holding a forum for you to address any issues or questions you may have. The forum details are:

Thursday May 19th, 2022, 6:30pm – 8:00pm at the McHenry Township Hall.

Now that you have your tax bill, there are very limited ways to adjust it. If there are any exemptions you are entitled to that are not applied, we can correct that. If you believe the information we have about the physical aspects of your property is incorrect, you should call the office and talk with me or one of my Deputy Assessors. That way, if there is a correction needed, we can fix it. As hard as we try, sometimes the information we have is incorrect so as a property owner, it is always good practice to check your property information and inform us of any incorrect information.

We are here Monday through Friday between 8:30am – 4:30pm to assist you. Our building is now open but ask that you call for an appointment when you need assistance with exemption forms or to review your property information. This allows us to make sure I have staff available to assist you in a timely manner.

I wish you all a safe and healthy summer!



Mary Mahady, C.I.A. O.

McHenry Township Assessor



Our next Facebook Live will be on Wednesday, June 8, 2022 at 3:30pm. As always if you have questions, please feel free to contact my office or email me at


McHenry Township Assessor Mary Mahady

Senior Freeze

The 2022 Senior Freeze Forms have been mailed and are due July 1, 2022. Should you need assistance in completing the form, please call our office at (815) 385-0175 to make an appointment.

Homeowner Exemption

If you should be receiving this exemption but it does not show on your tax bill, please call us. We can verify this with the proper documentation and submit a correction to the tax bill, but you need to contact us. If you are not sure, just call and we will check for you.

Senior Homestead

You are eligible for this if you have the General Homestead exemption and anyone on title is 65 or older.

As much as we like to see you, please call if you have any questions as we can rectify most situations over the phone. Our first priority is to keep you safe and until we can fully open to the public, we will find a way to take care of you any way we can…just call!  

During our time of appeal or when applying for exemptions, we ask that you make an appointment with our office by calling (815)-385-0175. We do have availability for appointment during business hours on Monday, Wednesday and Friday from 9:00am through 3:00pm with a break for lunch from 12-1pm. We will be scheduling after hours appointments, if necessary, to be determined at a later date.


Mary Mahady

We are here to assist you so don't hesitate to call if you have any questions!