Lake County Property Tax Appeal Guide
In Lake County, file your appeal by An appeal (complaint) to the county Board of Review must be filed within 30 days after the date the county or township assessment list is published. In Cook County, appeals are filed during township-specific filing windows that open and close on a rolling basis as each township's assessments are published. A written appeal to the county Board of Review is a prerequisite to any further appeal. After the Board of Review issues its written decision, a petition to the state Property Tax Appeal Board (PTAB) must be filed within 30 days of that written notice (or, in Cook County, within 30 days of the BOR's transmittal of its final township action, whichever is later); alternatively the taxpayer may file in circuit court. at Lake County Chief County Assessment Office's online portal.
| Deadline | An appeal (complaint) to the county Board of Review must be filed within 30 days after the date the county or township assessment list is published. In Cook County, appeals are filed during township-specific filing windows that open and close on a rolling basis as each township's assessments are published. A written appeal to the county Board of Review is a prerequisite to any further appeal. After the Board of Review issues its written decision, a petition to the state Property Tax Appeal Board (PTAB) must be filed within 30 days of that written notice (or, in Cook County, within 30 days of the BOR's transmittal of its final township action, whichever is later); alternatively the taxpayer may file in circuit court. |
|---|---|
| Lien date | January 1, 2026 |
| Appeal body | County Board of Review (BOR) |
| Assessor / district | Lake County Chief County Assessment Office |
| Online portal | File online |
How to File a Appeal in Lake County
- Gather your assessment notice — it lists your account number and any access code
- File online through Lake County Chief County Assessment Office's portal or by mail
- State your grounds and submit evidence (comparable sales, a licensed appraisal, or photos of defects)
- Request an informal review to try to settle before a formal BOR hearing