See what to expect on your closing statement. Illinois residential real estate · Cook, DuPage, Will, Kendall & Kane counties.
| Area | Typical rate |
|---|---|
| DuPage, Will, Kane, Kendall counties | 105% |
| Cook County suburbs | 105–110% |
| City of Chicago | 110% |
Illinois taxes are billed a year behind — the bill you have now covers last year. The extra percentage above 100% helps cover the increase your buyer will likely see on the next bill.
Collar counties (DuPage, Will, Kane, Kendall) bill twice a year: 1st installment due June 1, 2nd due September 1.
Cook County works differently — the 1st installment (55% of last year's bill) is usually due in March, and the 2nd is billed in summer, usually due in August (sometimes later).
Confirm exact due dates for your property on the county portal before closing.
Use your most recent full-year tax bill, not a single installment. If you only have installment amounts, add both together for the annual total.
If your home was recently built or reassessed, your current bill may understate what you'll owe going forward — ask your agent whether to use the assessor's estimated value instead.
If your last tax installment is due but you haven't paid it, you'll need to credit your buyer the full amount at closing — not just a prorated share. Your title company will flag this automatically.
If an installment isn't due yet, it's already covered by the standard credit above.
If you have a homeowner, senior, or senior freeze exemption, it stays with you — it does not carry over to your buyer.
Let your agent know about any exemptions on the property so your buyer isn't surprised by a higher bill after the sale.
This calculator gives you a planning estimate, not the final number. Your title company or closing attorney calculates the official proration figures used at closing.
Always confirm the exact amount with them, and verify current tax bills and due dates on the county portal, before you close.
ⓘ This calculator is a planning tool to help you understand tax prorations at closing — it is not a substitute for advice from your title company, real estate attorney, or tax professional. They will confirm the exact figures before you close. Tax bills, due dates, and rates are subject to change. Always verify current figures with the appropriate county portal. Illinois only (Cook, DuPage, Will, Kendall, Kane counties) — a Southwest Michigan version uses different tax rules and is planned separately.