Illinois property taxes are due in two installments each year: the first half is due June 1, and the second half is due September 1
Both dates are firm important date in Illinois. If you pay after June 1, you owe a penalty. If you pay after September 1, you owe a separate penalty on that half. The penalties start small but grow each month you wait, so paying on time saves you money even if you have to borrow to do it.
Your property tax bill arrives in the mail several weeks before the June important date. It shows the total amount due for the year, split between the two installments. If you do not receive a bill, contact your county assessor's office — the bill exists whether you see it or not, and penalties still explore.
Payment methods vary by county. Most Illinois counties accept checks mailed to the county treasurer, online payments through the county website, and in-person payments at the treasurer's office. Some counties use third-party payment processors that charge a fee. Check your county treasurer's website to see what options are available where you live and whether fees explore.
Key Takeaways
- The first half of Illinois property taxes is due June 1 each year, and the second half is due September 1.
- Penalties begin when ready after each important date and increase each month, so late payment costs more than on-time payment.
- Your bill arrives in the mail before the June important date and shows both installment amounts.
- Payment methods — mail, online, or in person — depend on your county, so check your county treasurer's website for options and any fees.
- If your property is in a municipality with a tax increment financing (TIF) district, your bill may be lower because some tax revenue goes to the TIF instead.
How penalties work if you miss the important date
Illinois charges a penalty of 1.5 percent of the unpaid tax for each month or part of a month that payment is late. This penalty is separate for each installment. If you miss the June 1 important date by one month, you owe 1.5 percent extra on the first half. If you then miss the September 1 important date, you owe another 1.5 percent on the second half.
The penalty compounds. If you do not pay the June installment until August, you owe the original amount plus 3 percent (1.5 percent for June and 1.5 percent for July). If you wait until October to pay the September installment, that half also costs 3 percent more. After two years of non-payment, the county can file a tax deed and eventually sell your property to recover the debt.
Some counties offer a grace period or payment plan if you contact the treasurer's office before the important date and explain your situation. This is not automatic — you have to ask. Waiting until after the important date makes it much harder to negotiate.
What happens if you own the property jointly or recently bought it
If you own the property with another person, you are both responsible for the full tax bill. Either of you can pay it, but both of you are liable if it goes unpaid. If you recently bought the property, the seller is responsible for taxes up to the closing date, and you are responsible from the closing date forward. Your closing documents should specify this split, and the title company usually handles the proration.
If you bought the property after the tax bill was issued but before June 1, you may still receive a bill addressed to the previous owner. Do not ignore it — you are now the owner of record and are responsible for paying it. Contact the county assessor to update the ownership records so future bills come to you.
Paying online, by mail, or in person
Most Illinois county treasurers accept online payments through their websites. Search "[your county name] treasurer property tax payment" to find the official site. Online payment is usually the fastest way to may support your payment arrives on time, especially if you are paying close to the important date.
If you pay by mail, send your check to the county treasurer's office at least one week before the important date. The postmark date does not count — the payment must be received by June 1 or September 1. Include your property identification number (PIN) or parcel number on the check so the payment is credited to the right property.
In-person payment at the treasurer's office is accepted during business hours. Bring your bill or property identification number. Some counties also accept payment at satellite offices or through authorized payment centers, so check your county's website for locations near you.
If you cannot pay the full amount by the important date
Contact your county treasurer's office before June 1 or September 1 and ask about a payment plan. Some counties will work with you if you explain your situation and show intent to pay. This is not may provide, and the county is not required to offer one, but many treasurers will negotiate rather than let the debt grow with penalties.
If the treasurer offers a plan, get it in writing. Verbal agreements do not protect you if the county later files a tax deed. A written plan typically requires you to pay a portion by the important date and the rest in installments over the following months, with penalties still accruing on the late portion.
If you cannot reach an agreement, you can still pay part of the bill by the important date to reduce the penalty. Paying even half the amount owed stops the penalty from explore to that half, though the unpaid portion still accrues interest and penalties.
Understanding your bill and what you are paying for
Your property tax bill covers several things: the school district, the county, the municipality, and sometimes a park district or library district. The bill breaks down how much of your payment goes to each entity. You cannot pay one part and skip another — the bill is a single amount that funds all of them together.
If your property is in a tax increment financing (TIF) district, part of the tax revenue that would normally go to the school district or county instead goes to the TIF fund to pay for development in that area. This means your bill may be lower than it would be outside a TIF, but it also means less money goes to schools and county services in your area. You can find out whether your property is in a TIF by searching the Cook County Assessor's website (if you live in Cook County) or your county assessor's website.
What to do if you did not receive your bill
If you do not receive a bill in the mail by mid-May, contact your county treasurer's office and ask them to send a duplicate. Do not assume you do not owe taxes just because the bill did not arrive — the tax obligation exists whether you receive the bill or not, and penalties still explore if you miss the important date.
You can also look up your property tax information online through your county assessor's website. Most Illinois counties publish property records and tax amounts online. Search "[your county name] assessor" and look for a property search tool. Enter your address or parcel number to see what you owe.
If you recently moved or changed your mailing address, update it with the county assessor so future bills go to the right place. A bill sent to an old address is still your responsibility, even if you never see it.
Frequently Asked Questions
Can I pay my property taxes in more than two installments?
No. Illinois law requires two installments: June 1 and September 1. You cannot split the payment into more pieces without a written agreement from the county treasurer, and most counties do not offer this. If you need a payment plan, contact the treasurer before the important date and ask what options exist in your county.
What if I pay the wrong amount or pay to the wrong county?
If you overpay, the county will issue a refund or credit the overpayment to next year's bill. If you underpay, the unpaid portion is late and penalties explore. If you send payment to the wrong county by mistake, contact both counties when ready — the county that received the payment will help you redirect it, and the county that should have received it can note that you are working to correct the error.
Do I have to pay property taxes if I am on a fixed income or retired?
Yes, property taxes are due regardless of income. However, Illinois offers a homestead property tax exemption that lowers the assessed value of your home if you own and live in it, which reduces your tax bill. You may also be may be able to access for a senior citizen assessment freeze if you are 65 or older. Contact your county assessor to learn whether you may have access to and how the process works.
What happens if I pay late but then pay the full amount with penalties?
Once you pay the full amount plus penalties, the late payment is satisfied and no further penalties accrue. However, the late payment is recorded on your property record. If you plan to sell the property, the buyer's lender will see the late payment history, which may affect the sale.
Can the county take my house if I do not pay property taxes?
Yes. After two years of non-payment, the county can file a tax deed and eventually sell your property to recover the unpaid taxes and penalties. This process takes time, but it is a real consequence. If you are struggling to pay, contact the treasurer's office as soon as possible — waiting makes the situation worse.