Illinois
Illinois' penalty accrues per six-month period rather than annually — up to 18% each half-year the certificate goes unredeemed, which compounds to a much higher effective annual return than a flat-rate state. Bidding is by rate, driven down from that 18% ceiling.
Quick answers
Is Illinois a tax lien or tax deed state?+
Illinois is a tax lien certificate state.
What's the interest rate or penalty in Illinois?+
In Illinois, the rate is: Up to 18% per 6-month period, bid down.
How long is the redemption period in Illinois?+
The redemption period in Illinois is 2–3 years.
Not sure how Illinois's system compares to a state you already know? Read Tax Lien vs. Tax Deed: What's the Difference? for the full breakdown.
This page is general information, not financial or legal advice. Rates and redemption periods are set by state statute and can change by county or legislative session — always confirm against the county's own auction notice before bidding.