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Illinois unclaimed property is held by the State Treasurer's Unclaimed Property Division, known as I-Cash. Property is returned at no cost with proper identification.
Source: Illinois State Treasurer — Unclaimed Property Division (I-Cash) (icash.illinoistreasurer.gov)
Illinois defines mineral proceeds but gives them no separate period, so the catch-all three-year period applies. The statute adds that when the owner is deceased, property with a longer period is presumed abandoned two years after the owner's last indication of interest.
Dormancy period: 3 years (2 years if the owner is deceased)
Statute: 765 ILCS 1026/15-201(15) (Revised Uniform Unclaimed Property Act, catch-all)
Mineral-specific rule: No (general period)
Source: 765 ILCS 1026/15-201(15) (Revised Uniform Unclaimed Property Act, catch-all)
Illinois splits holders into two groups: financial organizations and non-life insurers file before November 1 for the 12 months before July 1, and all other business associations file before May 1 for the preceding calendar year. Oil and gas payors are not named, so which group applies depends on the type of business.
Report due: Before May 1 for most business associations (covering the preceding calendar year); before November 1 for financial organizations and non-life insurers (covering the 12 months preceding July 1)
Covers property held as of: Preceding calendar year (May 1 filers) or 12 months preceding July 1 (November 1 filers)
Source: Official source
Illinois claimants prove identity with a document showing both their name and Social Security number, such as a Social Security card, W-2 or 1099, and prove the reported address with a document showing their name at that address.
How to file: Search and file on the Treasurer's I-Cash site.
Proof required: A document showing both name and Social Security number (e.g., Social Security card, W-2 or 1099); age verification by state ID or birth certificate where needed; a document showing name and the reported previous address (e.g., USPS-cancelled envelope, school records).
Source: Official claim instructions
Illinois follows the Probate Act for deceased owners. Depending on the estate, the Treasurer may ask for the death certificate, a court-certified will, current Letters of Office (no older than three years), its Small Estate Affidavit, and documents proving family relationships when there is no will.
Documents: The Treasurer follows the Illinois Probate Act: death certificate; certified copy of the will (court-stamped) if any; Letters of Office (current within three years) if an estate is open; the Treasurer's Small Estate Affidavit where applicable; relationship documentation when there is no will.
Whether an estate must be opened is a legal question for a qualified attorney in that state.
Source: Official source
The Treasurer returns property at no cost. Since January 1, 2026, anyone acting as a finder must be licensed by the Treasurer. Finder fees above 10% of the amount collected are unenforceable, and finder agreements made before 24 months after the property reaches the Treasurer are void.
State claim fee: None
Finder-fee limit: 10% of the amount collected (higher fees unenforceable except by the owner); agreements made from the presumed-abandoned date until 24 months after delivery to the Treasurer are void; provisions assigning obligations not yet owed are void; from January 1, 2026 a finder must hold a finder license from the Treasurer (15-1302(e), 15-1303)
Finder-fee statute: 765 ILCS 1026/15-1302, 15-1303
Sources: Official source · 765 ILCS 1026/15-1303 (finder license)
Illinois unclaimed property is held by the State Treasurer's Unclaimed Property Division, known as I-Cash. Property is returned at no cost with proper identification. Search under every name the royalties may have been paid to, including maiden names and deceased relatives.
Illinois defines mineral proceeds but gives them no separate period, so the catch-all three-year period applies. The statute adds that when the owner is deceased, property with a longer period is presumed abandoned two years after the owner's last indication of interest.
Illinois claimants prove identity with a document showing both their name and Social Security number, such as a Social Security card, W-2 or 1099, and prove the reported address with a document showing their name at that address.
Illinois follows the Probate Act for deceased owners. Depending on the estate, the Treasurer may ask for the death certificate, a court-certified will, current Letters of Office (no older than three years), its Small Estate Affidavit, and documents proving family relationships when there is no will. This is general information, not legal advice.
The Treasurer returns property at no cost. Since January 1, 2026, anyone acting as a finder must be licensed by the Treasurer. Finder fees above 10% of the amount collected are unenforceable, and finder agreements made before 24 months after the property reaches the Treasurer are void.
Educational information only, not legal or tax advice; consult a qualified attorney about your situation. Facts are from the state's unclaimed-property office and the state code, checked Nov 2, 2026. Related: unclaimed royalties in every state · suspended royalties · find your payor
