2026 DEADLINE TRACKER · VERIFIED JULY 31, 2026
2026 DEADLINE TRACKER · VERIFIED JULY 31, 2026
Chicagoland Property Tax Appeal Deadlines
As of July 31, 2026, property tax appeal windows are open across parts of Cook and Lake counties. Will County opens August 12, while DuPage County township dates remain pending. Use the verified lists below to find the deadline that applies to your property.
Deadlines can change. Confirm the date for your property before filing; this tracker is informational and is not legal advice.
Deadlines can change. Confirm the date for your property before filing; this tracker is informational and is not legal advice.
QUICK ANSWERS
QUICK ANSWERS
What are the 2026 Chicagoland property tax appeal deadlines?
As of July 31, Cook County Assessor appeals are open in Cicero through July 31, Elk Grove through August 4, Stickney through August 12, West Chicago through August 21, Lyons through September 3, and Northfield through September 4. Lake County windows are open in Benton and Ela. Will County opens August 12, while DuPage County township dates remain pending.
As of July 31, Cook County Assessor appeals are open in Cicero through July 31, Elk Grove through August 4, Stickney through August 12, West Chicago through August 21, Lyons through September 3, and Northfield through September 4. Lake County windows are open in Benton and Ela. Will County opens August 12, while DuPage County township dates remain pending.
As of July 31, Cook County Assessor appeals are open in Cicero through July 31, Elk Grove through August 4, Stickney through August 12, West Chicago through August 21, Lyons through September 3, and Northfield through September 4. Lake County windows are open in Benton and Ela. Will County opens August 12, while DuPage County township dates remain pending.
How do I know which deadline applies to my property?
How do I know which deadline applies to my property?
The controlling window is usually tied to the county and township where the property is assessed. Confirm the township using the property PIN, then use the official source linked on the matching record below.
The controlling window is usually tied to the county and township where the property is assessed. Confirm the township using the property PIN, then use the official source linked on the matching record below.
The controlling window is usually tied to the county and township where the property is assessed. Confirm the township using the property PIN, then use the official source linked on the matching record below.
What happens if my township’s deadline recently closed?
What happens if my township’s deadline recently closed?
You generally cannot use a filing window after it closes. A later Board of Review window or another remedy may be available, but eligibility and timing differ by county and property, so confirm the next official deadline promptly.
You generally cannot use a filing window after it closes. A later Board of Review window or another remedy may be available, but eligibility and timing differ by county and property, so confirm the next official deadline promptly.
You generally cannot use a filing window after it closes. A later Board of Review window or another remedy may be available, but eligibility and timing differ by county and property, so confirm the next official deadline promptly.
Will a successful appeal lower my property tax bill?
Will a successful appeal lower my property tax bill?
An appeal challenges the property’s assessed value, not the bill directly. A lower assessment can reduce the resulting tax bill, but the final amount also depends on tax rates, exemptions, and other factors.
An appeal challenges the property’s assessed value, not the bill directly. A lower assessment can reduce the resulting tax bill, but the final amount also depends on tax rates, exemptions, and other factors.
An appeal challenges the property’s assessed value, not the bill directly. A lower assessment can reduce the resulting tax bill, but the final amount also depends on tax rates, exemptions, and other factors.
What evidence should I gather before filing?
What evidence should I gather before filing?
Residential appeals commonly use comparable sales, comparable assessments, and property-record corrections. Commercial appeals may also require income and expense statements, rent rolls, vacancy evidence, or an appraisal.
Residential appeals commonly use comparable sales, comparable assessments, and property-record corrections. Commercial appeals may also require income and expense statements, rent rolls, vacancy evidence, or an appraisal.
Residential appeals commonly use comparable sales, comparable assessments, and property-record corrections. Commercial appeals may also require income and expense statements, rent rolls, vacancy evidence, or an appraisal.
2026 DEADLINE STATUS
2026 DEADLINE STATUS
Find the deadline that applies to your property
Township and county schedules differ. Start with Open now, then review Opening soon, Recently closed, and Dates pending. Every record links to the official county source.
Township and county schedules differ. Start with Open now, then review Opening soon, Recently closed, and Dates pending. Every record links to the official county source.
Township and county schedules differ. Start with Open now, then review Opening soon, Recently closed, and Dates pending. Every record links to the official county source.
Which townships are open for property tax appeals right now?
Which townships are open for property tax appeals right now?
Which townships are open for property tax appeals right now?
These filing windows are open as of July 31, 2026. The soonest deadline appears first.
These filing windows are open as of July 31, 2026. The soonest deadline appears first.
These filing windows are open as of July 31, 2026. The soonest deadline appears first.
COOK COUNTY
COOK COUNTY
OPEN
OPEN
Cicero Township
Cicero Township
The 2026 Assessor filing window closes July 31. Confirm the portal remains open before filing.
The 2026 Assessor filing window closes July 31. Confirm the portal remains open before filing.
The 2026 Assessor filing window closes July 31. Confirm the portal remains open before filing.
COOK COUNTY
COOK COUNTY
OPEN
OPEN
Elk Grove Township
Elk Grove Township
The Assessor filing window is open through August 4.
The Assessor filing window is open through August 4.
The Assessor filing window is open through August 4.
COOK COUNTY
COOK COUNTY
OPEN
OPEN
Stickney Township
Stickney Township
The Assessor filing window is open through August 12.
The Assessor filing window is open through August 12.
The Assessor filing window is open through August 12.
COOK COUNTY
COOK COUNTY
OPEN
OPEN
West Chicago Township
West Chicago Township
The Assessor filing window is open through August 21.
The Assessor filing window is open through August 21.
The Assessor filing window is open through August 21.
LAKE COUNTY
LAKE COUNTY
OPEN
OPEN
Benton Township
Benton Township
Lake County lists August 24 as the final filing date.
Lake County lists August 24 as the final filing date.
Lake County lists August 24 as the final filing date.
LAKE COUNTY
LAKE COUNTY
OPEN
OPEN
Ela Township
Ela Township
Lake County lists August 24 as the final filing date.
Lake County lists August 24 as the final filing date.
Lake County lists August 24 as the final filing date.
COOK COUNTY
COOK COUNTY
OPEN
OPEN
Lyons Township
Lyons Township
The 2026 Cook County Assessor filing window closes September 3.
The 2026 Cook County Assessor filing window closes September 3.
The 2026 Cook County Assessor filing window closes September 3.
COOK COUNTY
COOK COUNTY
OPEN
OPEN
Northfield Township
Northfield Township
The 2026 Cook County Assessor filing window closes September 4.
The 2026 Cook County Assessor filing window closes September 4.
The 2026 Cook County Assessor filing window closes September 4.
Which property tax appeal deadlines are opening soon?
Which property tax appeal deadlines are opening soon?
Which property tax appeal deadlines are opening soon?
These windows have official opening and closing dates but are not yet accepting filings.
These windows have official opening and closing dates but are not yet accepting filings.
These windows have official opening and closing dates but are not yet accepting filings.
Upcoming
Upcoming
Warren Township
Warren Township
Lake County lists August 6 as the publication date and September 8 as the final filing date.
Lake County lists August 6 as the publication date and September 8 as the final filing date.
Lake County lists August 6 as the publication date and September 8 as the final filing date.
Upcoming
Upcoming
Waukegan Township
Waukegan Township
Lake County lists August 6 as the publication date and September 8 as the final filing date.
Lake County lists August 6 as the publication date and September 8 as the final filing date.
Lake County lists August 6 as the publication date and September 8 as the final filing date.
Upcoming
Upcoming
Will County 2026 Filing Window
Will County 2026 Filing Window
The countywide complaint portal is scheduled to accept submissions from August 12 through September 14.
The countywide complaint portal is scheduled to accept submissions from August 12 through September 14.
The countywide complaint portal is scheduled to accept submissions from August 12 through September 14.
Which Chicagoland filing windows recently closed?
Which Chicagoland filing windows recently closed?
Which Chicagoland filing windows recently closed?
These Assessor or Board of Review windows have closed. Check the official source for any later review stage or other available remedy.
These Assessor or Board of Review windows have closed. Check the official source for any later review stage or other available remedy.
These Assessor or Board of Review windows have closed. Check the official source for any later review stage or other available remedy.
Recently closed
Recently closed
Maine Township
Maine Township
The 2026 Cook County Assessor filing deadline was July 21. Check the official calendar for the next review stage.
The 2026 Cook County Assessor filing deadline was July 21. Check the official calendar for the next review stage.
The 2026 Cook County Assessor filing deadline was July 21. Check the official calendar for the next review stage.
Recently closed
Recently closed
Palos Township
Palos Township
The 2026 Cook County Assessor filing deadline was July 17. Check the official calendar for the next review stage.
The 2026 Cook County Assessor filing deadline was July 17. Check the official calendar for the next review stage.
The 2026 Cook County Assessor filing deadline was July 17. Check the official calendar for the next review stage.
Recently closed
Recently closed
Lakeview Township
Lakeview Township
The 2026 Cook County Assessor filing deadline was July 13. Check the official calendar for the next review stage.
The 2026 Cook County Assessor filing deadline was July 13. Check the official calendar for the next review stage.
The 2026 Cook County Assessor filing deadline was July 13. Check the official calendar for the next review stage.
Which county has not announced all 2026 appeal dates?
Which county has not announced all 2026 appeal dates?
Which county has not announced all 2026 appeal dates?
No filing date is shown until an official county source publishes it. Pending records are rechecked every week.
No filing date is shown until an official county source publishes it. Pending records are rechecked every week.
No filing date is shown until an official county source publishes it. Pending records are rechecked every week.
Dates pending
Dates pending
DuPage County Township Dates
DuPage County Township Dates
DuPage deadlines are township-specific. This tracker will add exact 2026 dates when the county publishes each assessment roll.
DuPage deadlines are township-specific. This tracker will add exact 2026 dates when the county publishes each assessment roll.
DuPage deadlines are township-specific. This tracker will add exact 2026 dates when the county publishes each assessment roll.
WHAT TO DO NEXT
WHAT TO DO NEXT
A deadline is only the first decision
Before filing, compare the assessed value with recent sales, review the property record for errors, and decide whether comparable properties support an equity argument. Commercial appeals may also require income, expense, rent-roll, appraisal, or vacancy evidence.
Before filing, compare the assessed value with recent sales, review the property record for errors, and decide whether comparable properties support an equity argument. Commercial appeals may also require income, expense, rent-roll, appraisal, or vacancy evidence.
Before filing, compare the assessed value with recent sales, review the property record for errors, and decide whether comparable properties support an equity argument. Commercial appeals may also require income, expense, rent-roll, appraisal, or vacancy evidence.
Think your property is over-assessed?
Think your property is over-assessed?
Younis Law Group handles residential and commercial property tax appeals across Chicagoland.
Younis Law Group handles residential and commercial property tax appeals across Chicagoland.