Deadlines · Illinois counties outside Cook
Kane County property tax appeal
Each Kane County township has its own filing deadline, set when its 2026 assessment changes are published in a local newspaper. Complaints postmarked by the deadline count as filed on time.
Kane County 2026 appeal deadlines
Official source: Kane County Assessment Office
Kane County township guides
How to file your Kane County appeal
- 1
Find your township's deadline
Kane County sets each township's deadline when its assessments are published in the local newspaper. The full list is on the county's filing deadlines page.
- 2
Talk to your township assessor
Questions about your valuation go to your township assessor first — the Board of Review can only act after publication.
- 3
Prepare your evidence
For an overvaluation complaint, gather recent comparable sales. The Board's 2026 rules require disclosure of any recent sale of your property.
- 4
File with the Board of Review
File your complaint with the Kane County Board of Review at 719 S. Batavia Ave, Building C, Geneva before your township's deadline. Mailed complaints count as filed on the postmark date.
- 5
Attend the hearing
The Board notifies you of your hearing, reviews the evidence, and issues its findings. Further appeal goes to the Illinois Property Tax Appeal Board (PTAB).
Good to know
- The Board of Review phone is (630) 208-3818.
- Properties substantially damaged in the July 2–4, 2026 storms may qualify for a disaster-area reassessment — see the county's disaster page.
File with the official Kane County portal
Appeals are free to file with the county. Use the official Kane County Board of Review — and if your home is in Cook County instead, we have a step-by-step guide and kit for that.