Cook County, IL property tax deadlines
3 coming property tax dates for Cook County, Illinois. Each one links to its official source and shows the day LevyDay last checked it.
| Next dates | Bills due | Last day without penalty | Appeal by | Exemption filing |
|---|---|---|---|---|
| Cook | Mar 1, 2027tax.illinois.govOct 21 | Not on file | Set by noticeptab.illinois.govOct 21 | Not on file |
Deadlines in date order
| Date and source | Deadline |
|---|---|
| March 1 every yeartax.illinois.govOct 21 | Bills due First installment, 55% of last year's tax The Treasurer sets the real date each year. For tax year 2025 it moved to April 1, 2026. |
| November 6, 2026 2026 onlycookcountyboardofreview.comOct 21 | Other 2026 Board of Review appeal, Lyons, Northfield, Stickney and West Chicago townships only |
| Varies, see rule set by noticeptab.illinois.govOct 21 | Appeal deadline Appeal to the state Property Tax Appeal Board You have 30 days from the postmark on the board of review's written decision (or on the notice of final township multipliers). |
Appealing your assessed value
Appeal by the date on your noticeptab.illinois.govOct 21
If you think the county valued your home too high, you can appeal. Filing with the county is free and you can do it yourself.
Get help filing an appeal
After you send your details, we look for an independent appeal firm or attorney to take your case. We'll be in touch once one has agreed. Firms usually charge a share of what you save, and the one that takes it may pay LevyDay a referral fee.
LevyDay doesn't file appeals or give legal or tax advice. We only pass your details on. The independent firm or attorney that takes your case does the work and sets its own fee.
Get help filing an appealAlready passed
- Apr 1, 2026 2025 taxes, first installment cookcountytreasurer.comOct 21
- Sep 1, 2026 2026 Board of Review appeal, Evanston, New Trier, Norwood Park, Oak Park, River Forest, Riverside and Rogers Park townships only cookcountyboardofreview.comOct 21
- Sep 1, 2026 2026 Board of Review exemption filing, all townships cookcountyboardofreview.comOct 21
- Sep 29, 2026 2026 Board of Review appeal, Berwyn, Cicero, Elk Grove, Lakeview, Maine and Palos townships only cookcountyboardofreview.comOct 21
- Oct 1, 2026 2025 taxes, second installment cookcountytreasurer.comOct 21
Good to know in Illinois
- Paying late: Late taxes carry an interest penalty of 1.5% per month, and it starts the day after the due date. More
- Appealing your value: Outside Cook County, you appeal your assessment to the county board of review. In Cook County, you can file with the county assessor or the county board of review. More ptab.illinois.govOct 21
- Homestead exemption: The General Homestead Exemption is for a home occupied by its owner as their principal dwelling place. It's worth up to $10,000 of assessed value in Cook County, $8,000 in counties next to Cook and $6,000 elsewhere. More tax.illinois.govOct 21
Free reminders from the county
- If you are behind on Cook County property taxes and set up a plan with the Treasurer's Payment Plan Calculator, you can sign up for email or text reminders to make your partial payments. Sign up with the county
Official offices
Places in Cook County
Among them: Alsip, Arlington Heights, Barrington, Barrington Hills, Bartlett, Bedford Park, Bellwood, Bensenville, Berkeley, Berwyn, Blue Island, Bridgeview, Broadview, Brookfield, Buffalo Grove, Burbank, Burnham, Burr Ridge, Calumet City, Calumet Park, Chicago, Chicago Heights, Chicago Ridge, Cicero, and 112 more. Every place in the county gets the dates above.
Nearby in the Illinois list
ChampaignChristianClarkClayClintonColesCrawfordCumberlandDeKalbDe WittDouglasDuPage