Filing Estate Taxes in Illinois
By Illinois law, The Illinois Attorney General administers the Illinois Estate Tax. Estate taxes must be filed with the Office of the Attorney General. The office will make forms available on the website each year.
Any and all payments of Illinois estate tax, interest and penalties must be paid directly to the Illinois State Treasurer.
Please contact the Estate Tax Section, Illinois Attorney General’s Office with any questions or problems:
Estate Tax Section
115 S. LaSalle Street
Chicago, IL 60603
Telephone: (312) 814-2491
Estate Tax Section
500 South Second Street
Springfield, Illinois 62701
Telephone: (217) 524-5095
Messages left on the estate tax lines will be monitored and callers will receive a response as soon as possible.
Information on Illinois Laws Covering Estate Taxes
- Illinois Estate and Generation-Skipping Transfer Tax Act" (35 ILCS 405/1, et seq.)
- Illinois estate tax regulations (Ill. Admin. Code tit. 86, § 2000.100, et seq.)
- Form 4350a (computation worksheet)
- Revised Instruction Sheet Regarding the Estate Tax Treatment of Civil Unions
- Extension Request Form (Form700-EXT1)
Inheritance Tax Releases: An Illinois Inheritance Tax Release may be necessary if a decedent died before January 1, 1983. If a release is required, please call Chicago (312) 814-2491 or Springfield (217) 524-5095 for further assistance.
Estate Tax Forms
Each year, the Attorney General makes available forms and instructions to calculate and file estate taxes base on the year the individual died. The most recent forms are linked and previous years can be searched in the archive.