Should you appeal every year?
No. Appeal when something changed, or when you have a case you did not have before.
You may appeal annually. That does not mean you should.
When it is worth it
- A reassessment year. The value was rebuilt, and rebuilt values carry new errors.
- You just bought at arm's length below the county's implied value. Strongest evidence there is.
- The record is wrong and you have only now noticed.
- Comparable properties moved — a wave of appeals nearby can leave you the outlier.
- The market fell and the assessment did not follow.
When it is not
- You appealed last year and won, and nothing has changed. You are asking a board to re-decide what it just decided.
- You are already assessed below comparable properties. This is exposure without upside.
- The saving is trivial relative to the effort and the risk of an upward review.
A better habit
Check every year; file when the check finds something. Checking costs an evening and tells you which year is your year.
This is general information about how Illinois assessments and appeals work. It is not
legal advice, not an appraisal, and not a prediction about your case. Deadlines and rules differ by
county — check yours with your Board of Review.