How to appeal a Lake County, IL property assessment
✓ Verified — Last verified October 24, 2026
Filing details published for Lake County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
Notice-dependent instructions
Appeal within 30 days after the township assessment publication; use the final filing date on the assessment notice and county township schedule.
Official source. Verified .
Where to file
File electronically with the Lake County Board of Review.
Official source. Verified .
Assessment notice period
Notices arrive during mid to late summer; publication and appeal deadlines vary by township.
Official source. Verified .
Official offices
Lake County Chief County Assessment Office
Sources for these instructions
https://www.lakecountyil.gov/4219/Assessment-Notices
After assessments are published for each township, a property owner has 30 days to appeal their assessment if they so desire. The deadline date for each property is listed on the assessment notice.
Verified October 24, 2026
https://www.lakecountyil.gov/4219/Assessment-Notices
Appeals Must Be Filed Electronically Property owners can appeal their assessment through the Lake County Board of Review on their own.
Verified October 24, 2026
https://www.lakecountyil.gov/4219/Assessment-Notices
Appeals Must Be Filed Electronically
Verified October 24, 2026
Continue with your property
Common questions
Where do I file a Lake County assessment appeal?
File electronically with the Lake County Board of Review.
Updated , from cited verification dates. Individual sources may have earlier checks.