The short answer
3 years from the date of sale, or 1 year for vacant non-farm, commercial, industrial, and 7-or-more-unit residential property
How the clock works
Property sold at an Illinois tax sale may be redeemed at any time before the redemption period expires. Public Act 104-0553 set the standard period at 3 years from the date of sale for tax certificates issued on or after July 10, 2026. Certificates issued between January 1, 2024 and July 9, 2026 run on the earlier 2.5 year (30 month) track, and on that track the certificate holder could file a written notice with the county clerk extending redemption to a date no later than 3 years from the sale. A short 1 year period applies when the parcel was, on the date of sale, vacant non-farm property, commercial or industrial property, or improved with a structure holding 7 or more residential units. Certificates the county holds or assigns as trustee run on their own schedule under Section 21-385, and an assignee must file notice within 60 days of assignment setting a redemption deadline no later than 3 years from the assignment.
Who can redeem
Any owner or person interested in the property, whether or not that interest is recorded, other than an undisclosed beneficiary of an Illinois land trust. A redemption is presumed made on behalf of every owner and interested party and benefits whoever holds legal or equitable title.
What the owner pays to redeem
Paid to the county clerk. The total is the certificate amount (tax principal, special assessments, interest, penalties, costs, and sale fees), plus the accrued penalty computed in six-month steps at the penalty bid, plus subsequent taxes the certificate holder paid with a 12 percent penalty for each year or portion of a year, plus clerk, circuit clerk, sheriff, publication, title search, and municipal reimbursement fees allowed by Section 21-355.
How your interest accrues
The penalty does not accrue daily or monthly. Section 21-355(b) charges the certificate amount times the penalty bid if redemption happens within 6 months of the sale, times 2 in months 6 to 12, times 3 in months 12 to 18, times 4 in months 18 to 24, times 5 in months 24 to 30, and times 6 in months 30 to 36. A redemption one day into a new step pays the whole step. Subsequent taxes the certificate holder posts carry a separate 12 percent penalty for each year or portion of a year until redemption. Certificates the county holds as trustee in counties with more than 3,000,000 inhabitants accrue at 0.75 percent per month instead of in six-month steps, and a county that buys at the sale under Section 21-190 takes a 0.75 percent per month penalty bid.
How the penalty bidding works
Read the 9 percent figure as a penalty per redemption period, not as an annual interest rate. Section 21-215 caps the bid at 9 percent of the tax or special assessment and sets no floor, so bidding runs down to 0 percent and a 0 percent certificate returns only what was paid. Section 21-355 then charges that penalty once for the first six months after the sale and adds it again for each further six-month step, which is why a 9 percent bid costs the owner about 18 percent over a full year. Investors accept very low penalties on parcels they intend to take to a tax deed. Certificate life: a certificate is void unless the deed is taken out in the time allowed and recorded within one year after the redemption period expires, so the outside life is roughly four years from the sale on the standard track.
What happens when it ends
The redemption period expires without redemption and the circuit court finds the certificate holder complied with the notice and payment requirements. The court then enters an order authorizing a judicial tax deed auction, and the property must be offered at public auction within 120 days of that order. This auction route came in with Public Act 104-0553 and applies to tax certificates issued on or after July 10, 2026, so the first judicial tax deed auctions are not expected before 2027. Certificates issued earlier still run under the older process, where the court directs the county clerk to issue the deed to the petitioner without an auction.
A redeemed certificate, plus your accrued interest, is what makes the wait profitable; see how redemption periods work across states. An unredeemed certificate is instead your path to the property through a tax deed sale, which still does not convey marketable title on its own, so budget for a quiet title action.
Verified Jul 29, 2026 against Illinois statutes.
Tax Sale Atlas publishes educational information about public tax sale processes. This is not legal, financial, or investment advice. Rules, dates, and fees change; confirm with the county office before you bid.