How to Appeal Your Property Taxes in Kankakee County (and How to File It Yourself)

by Brian Wittman

Kankakee County publishes assessment changes in September and sets a single final appeal date in October for the entire county. The county posts that exact date each year, and filing the appeal costs you nothing.

I know the process works because I ran it on my own house. My assessment jumped about 25 percent, I appealed on comparable properties, and the valuation came down somewhere in the range of 18 to 20 percent. I have since helped a client do the same thing.

Both of those instances were in Cook County, where appealing your Cook County property taxes runs on a rolling township calendar that looks nothing like this one. The process is similar across Illinois. The calendar is not, and that is the part that costs people. How to appeal your property taxes in Will County is a separate article with separate dates, and Grundy County does not mail notices until late October. Same state, same statute, three different clocks. If you own in Manteno and you read a Will County article about a September deadline, you just got the wrong date.

When is the deadline to appeal your property taxes in Kankakee County?

Kankakee County publishes assessment changes in September and sets a single final appeal date in October for the entire county. For the 2025 assessment year, publication ran September 10 in the Daily Journal, and the final appeal date for every township was October 14. State law gives you 30 days from publication, but the county posts one specific deadline date rather than making you count, and it is worth knowing that the posted date has run slightly longer than 30 days. Check the Kankakee County Board of Review page for the current year's date before you rely on any of this.

Where the dates actually come from, and why you should check

Two townships publish in a different paper. Salina and Pilot run in the Herscher Pilot, and in 2025 they published one day later than everyone else. The final appeal date was still the same countywide.

The county posts a sheet each year called Publication and Appeal Deadline Dates, listing every township, its newspaper, its publication date, and the final appeal date. It lives on the Board of Review page alongside the rules and the complaint form. As of this writing the 2025 sheet is still the most recent one posted, which is normal for this point in the calendar, and it is also the reason you should look at the page yourself rather than trusting a number you read somewhere in August.

Why did my assessment change when I did not change anything?

Because assessments are set as of January 1 of the assessment year, not as of whatever your house is doing today, and because Illinois requires them to reflect one third of fair cash value. Your neighbors sold, the market moved, and the number followed.

That one third rule is the anchor for everything below. An assessment is not supposed to equal what your house is worth. It is supposed to equal roughly a third of it. So when you go looking for whether your number is wrong, you are comparing your assessed value against a third of what the evidence says the house is worth, not against the whole thing.

This is also the part that matters over a long hold. A property tax bill is not a one year problem, and Illinois property taxes are already the line that decides what a house really costs out here. Leave a wrong assessment alone and you carry that error into every year you own the place. Over five to ten years, a few hundred dollars a year of somebody else's math turns into real money that was never yours to pay.

Do you actually have a case?

Kankakee County recognizes exactly three legitimate grounds, and knowing which one you are on before you gather anything will save you an afternoon.

Overvaluation. The equalized assessed value exceeds one third of what the property would actually sell for between a willing buyer and a willing seller. You carry the burden here by a preponderance of the evidence.

Equity. Similar properties near you are assessed at a lower level relative to their value than yours is. The bar is higher on this one, clear and convincing evidence, but it is often the strongest residential case because you are not arguing about the market. You are pointing at the county's own numbers being inconsistent with each other.

Discrepancy in physical data. The county's record is wrong about your house. Wrong square footage, wrong lot size, a bathroom you do not have, a finished basement that is not finished. The rules require that the incorrect description was actually relied on in the valuation, so bring a plat of survey, photographs, or construction documents showing the correct data.

The three reasons that are not reasons

Here is the part that surprises people, and it is written directly into the county's rules.

Your tax bill going up is not grounds for appeal. A change in the tax rate is not grounds. And the percentage your assessment changed is not grounds either. The Board of Review has no authority over tax rates at all, and it is explicitly not allowed to consider how much your assessment moved as a basis for changing it.

That matters because "my taxes went up a lot" is exactly why most people start looking into this. It is a completely reasonable reason to go check your assessment. It is not, by itself, an argument the Board can act on. The argument has to be that the number is wrong, not that it is higher.

The mistake that costs people the entire year

Talk to your township assessor first. The county recommends it, and plenty of assessments get corrected right there without a formal complaint, especially when the problem is a factual error on the record card.

But understand what that conversation does not do. It does not pause the filing clock. The rules say so three times, and twice in bold, which tells you how often somebody calls in September, has a productive conversation, waits to hear back, and looks up in late October to find the window shut. State law does not allow the deadline to be extended while you are talking to the assessor.

So do both at once. Call the assessor, and file anyway if the date is getting close. You can always withdraw.

How do you actually file in Kankakee County?

On the county's own Real Estate Assessment Complaint Form, one form per parcel, filed with the Board of Review at 189 East Court Street in Kankakee.

The details that get filings thrown out:

Every piece of evidence has to be filed with the complaint. Not later, not at the hearing. If it is not in at filing, the Board does not consider it.

The form has to be signed by the owner, the trustee, the executor, or an Illinois-licensed attorney with a letter of engagement. An unsigned form is non-compliant.

Bring copies. The original plus one copy of the form and all evidence. If you are seeking a reduction of $100,000 or more in assessed value, it is the original plus two copies, and you have to check the box saying so. Miss that box and the Board will not grant more than $100,000 no matter what your evidence shows.

No email, no fax. They are not accepted.

If you mail it, only the postal service counts. A USPS postmark establishes your filing date. FedEx, UPS, and DHL do not, so a package that arrives after the deadline is late regardless of when you handed it over.

If your form comes in non-compliant, the Board will tell you and give you 10 business days to fix it. Miss that and the complaint is dismissed.

What makes a good comparable here?

The rules are specific, and they differ from the county next door, which is a good reason not to reuse a checklist you found for somewhere else.

Kankakee prefers the three most similar properties. You may submit more, but the Board limits its examination to the first five from you and the first five from the township assessor. So the order you put them in matters. Lead with your best three.

Comps should be arm's length market transactions, located near your property or in the same subdivision, and similar in size, construction, quality, age, style, and condition. Sale dates closest to January 1 of the assessment year carry the most weight.

Several transaction types are generally not treated as market sales: sales between related parties, court ordered sales, sales in lieu of foreclosure, condemnation sales, transfers of less than a full interest, sales to an adjacent owner, option exercises, trades, and sale leasebacks. Short sales, interestingly, do count as market transactions unless something else disqualifies them.

If you are submitting an appraisal rather than comps, it has to conform to USPAP, be signed, and be complete with no missing pages, and it should carry a January 1 effective date for the assessment year in question.

What happens after you file, including the part nobody knows

This is the most useful thing in the county's rules and almost nobody is aware of it.

Before any hearing happens, the Board performs a preliminary review using your evidence and the assessor's, and mails you a preliminary determination of value. If you are satisfied with that number, you do nothing at all. It becomes the Board's assessment and your case closes. The hearing exists only for people who disagree with the preliminary number.

If you do go to a hearing, know the shape of it. Hearings run in fifteen minute slots and there are no continuances, because the tax cycle does not wait. You present, the township assessor may cross examine you, the assessor presents, you may cross examine them, and each side gets a closing remark.

And do not skip it. Failure to appear at a scheduled hearing results in dismissal, and that dismissal is specifically not treated as having exhausted your remedies, which can matter if you later want to go further.

What if the Board says no?

Two options, both on a 30 day clock from the written decision. You can appeal to the Illinois Property Tax Appeal Board, with forms at ptab.illinois.gov, or you can file an objection in circuit court. Most residential cases end at the Board of Review, which is where the winnable ones are usually won.

Before you appeal anything, check your exemptions

An exemption you are owed is easier to fix than an assessment you want changed, and plenty of people have both problems at once. Kankakee County administers the General Homestead exemption at up to $6,000, a Senior Citizens Homestead exemption at up to $5,000 for owners 65 and older with household income at or below $65,000, a Persons with Disabilities exemption at $2,000, Disabled Veterans exemptions ranging from $2,500 up to a full exemption at a 100 percent rating, a Returning Veterans exemption of $5,000, and a Home Improvement exemption covering up to $25,000 of added value for four years.

One deserves its own paragraph. The Senior Citizens Assessment Freeze requires a new application every single year, unlike the others that renew automatically once approved. And its income ceiling is climbing: $65,000 for 2025, $75,000 for 2026, $77,000 for 2027, and $79,000 for 2028. If a senior in your family was told they earned too much a year or two ago, that answer may have changed. It is worth asking again.

Applications go to your township assessor or to the Kankakee County Supervisor of Assessments, where every exemption form is posted, and they should be in by December 31 of the assessment year.

If the March storm damaged your property

This one is specific to Kankakee County right now, and it is easy to get the timing wrong in both directions.

Properties damaged in the March 10, 2026 storm will not see relief on the 2026 tax bills. Those bills, payable in June and September of 2026, are built on finalized 2025 assessed values, and 2025 came and went before the storm did. Nothing about the damage can reach backward into that number.

What the damage can reach is the 2026 assessment, which township assessors are working on now. If your property was damaged, or if your home is currently uninhabitable, contact your township assessor or the Supervisor of Assessments so the property gets reviewed while that work is still open. The county has said publicly that it wants those reviews to happen.

Separately, Illinois runs a Natural Disaster Homestead Exemption under 35 ILCS 200/15-173, and it only becomes available after you have rebuilt. The structure has to be rebuilt within two years of the disaster, the rebuilt square footage cannot exceed 110 percent of the original, the first application has to be filed no later than the first taxable year after the rebuild, and like the Senior Freeze it has to be applied for every year. If you are in the middle of a rebuild right now, that is a date to write down, because the exemption does not come find you.

Do you need to hire somebody for this?

For a straightforward residential case, no. The county wrote its rules for homeowners filing on their own, the forms are free, no appraisal is required, and the whole thing is a Saturday morning and a printer. Nobody in this chain gets paid to knock on your door and tell you the number is wrong, and that includes me. It is not a conspiracy, it is just how the job descriptions landed, and it is why a wrong number tends to stay wrong until the person living there decides to look.

Two things I will offer, in the order I actually mean them.

Pulling comparable sales is real work I do as a broker, and it is the step most people find hardest. If you want a set of comps for your own appeal, ask and I will pull them.

And if you would rather hand the whole thing to somebody who does appeals for a living, reach out and I will point you to someone. No fee to me, no strings, nothing I am getting out of it.

The Bottom Line

Kankakee County publishes in September and closes in October, and that is a different calendar from the county on either side of you. Check the Board of Review page for this year's exact date rather than counting 30 days or borrowing a deadline from somewhere else.

Then three steps do most of the work: pull your property record card and look for factual errors, confirm you are getting every exemption you qualify for, and if the number still looks wrong, put your three best comparables in front and file before the date.

I went into my own appeal assuming the assessment was probably right and I was probably wasting an afternoon. It was not right. It is worth the afternoon to find out whether yours is.

Frequently Asked Questions

When is the property tax appeal deadline in Kankakee County?

Kankakee County publishes assessment changes in September and sets one final appeal date in October for the whole county. In 2025, publication was September 10 and the final appeal date was October 14. The county posts the current year's dates by township on the Board of Review page, so confirm there rather than assuming last year's date carries over.

Can I appeal because my property taxes went up?

No, and this surprises people. The amount of taxes you paid, a change in the tax rate, and the percentage your assessment changed are all explicitly not valid grounds. The Board of Review has no authority over tax rates. Your argument has to be that the assessed value itself is wrong, through overvaluation, inequity, or an error in the physical data.

Does talking to my township assessor extend the deadline?

No. The county encourages you to talk to your assessor first and many issues get resolved that way, but state law does not allow the filing period to be extended while that conversation happens. Do both at the same time if the date is close.

How many comparable properties do I need in Kankakee County?

The rules say it is preferable to use the three most similar properties. You can submit more, but the Board only examines the first five from you and the first five from the township assessor, so lead with your strongest three.

Do I need an appraisal to appeal my assessment?

No. Comparable sales or assessment equity data are accepted evidence. If you do submit an appraisal it must conform to USPAP, be signed, and be complete with no missing pages, and it should carry a January 1 effective date for the assessment year.

What happens after I file my Kankakee County appeal?

The Board performs a preliminary review and mails you a preliminary determination of value before any hearing. If you are satisfied with it, you do nothing and it becomes final. If you disagree, you attend the hearing listed on that notice. Hearings run in fifteen minute slots and there are no continuances, and failing to appear results in dismissal.

Can I get my assessment lowered because of the March 2026 storm?

Not on the 2026 tax bills, which are based on finalized 2025 assessed values set before the storm happened. The damage can affect your 2026 assessment, which township assessors are working on now, so contact your township assessor or the Supervisor of Assessments to get the property reviewed. If you rebuild, Illinois also offers a Natural Disaster Homestead Exemption, applied for after the rebuild is complete.

What if I miss the Kankakee County deadline?

You wait until next year, and you pay the current bill in the meantime. There is no late filing at the Board of Review. In the meantime, check your exemptions, since those are a separate track with a December 31 application date, and start gathering comparables for next September.

Brian Wittman is a licensed real estate broker (Real Broker LLC), mortgage loan originator (NMLS #2646598, NEXA Mortgage, LLC, Equal Housing Lender), and life insurance producer (Levinson & Associates). This article is for educational purposes only and is not financial, lending, tax, or legal advice, an offer, or a commitment to lend; all loans are subject to credit approval. Information is accurate as of the publication date; for current details and full disclosures, visit https://bluejeanbroker.com/disclosures.