Cook County property tax
Cook County property tax appeal guides
A higher bill. A confusing notice. A deadline that slipped past. Start with the question on your mind, then work through the records one step at a time.
Understand your bill and property record
Start here if a notice or a higher bill brought you here.
Free homeowner guide
Wrong square footage on your Cook County assessment?
Verify property measurements, document a record error, and prepare a correction request with an evidence checklist.
Free homeowner guide
Why are my neighbor’s property taxes lower in Cook County?
Separate assessments from exemptions, compare similar homes, and work through a neighbor comparison before appealing.
Free homeowner guide
Why did my Cook County property tax bill go up?
Work through annual totals, assessment changes, exemptions, and tax rates before choosing your next step.
Free homeowner guide
How to read your Cook County assessment notice
Understand the numbers, verify your property facts, and turn your notice into an evidence checklist.
Free homeowner guide
Cook County property tax exemptions: are you missing one?
Check which exemptions apply, renew automatically, or need annual filing.
Free homeowner guide
How to find your Cook County PIN
Find your 14-digit PIN on county records and use it for filings and research.
Build your appeal research
Learn what to compare, which office to use, and how to prepare.
Free homeowner guide
Cook County property tax appeal evidence checklist
Organize records, sales comparisons, photos, and submission confirmations with a printable preparation checklist.
Free homeowner guide
How much could a Cook County property tax appeal save?
Work through an illustrative tax calculation and understand why an assessment reduction is different from a tax saving.
Free homeowner guide
Cook County property tax appeal after buying a home
Assessment higher than your purchase price? Compare the figures, gather closing documents, and check your appeal window.
Free homeowner guide
How to use CookViewer to compare Cook County properties
Find the official map, compare property facts, and keep assessment figures separate from recorded sale prices.
Free homeowner guide
How to find comparable sales
Review a hypothetical sales comparison and print a blank research worksheet.
Free homeowner guide
Assessor appeal vs Board of Review appeal
Understand the two appeal offices, their separate calendars, and the evidence each reviews.
Free homeowner guide
How to appeal without a lawyer
Gather evidence, check your township window, and file directly with Cook County.
Free homeowner guide
Cook County property tax appeal research guide
See how property records and comparable sales can support an assessment appeal.
Know what comes next
Work out your next step after a deadline or a decision.
Free homeowner guide
Missed your Cook County property tax appeal deadline?
Find out which window closed, check the other appeal office, and prepare for what comes next.
Free homeowner guide
What happens after a Board of Review appeal?
Understand PTAB's role after a Board of Review decision and its filing instructions.
Browse Cook County township appeal guides for local filing-window status and evidence guidance.