The "Illinois Estate and Generation-Skipping Transfer Tax Act" (35 ILCS 405/1, et seq.) may be found on the Illinois General Assembly's website at http://www.ilga.gov/legislation/ilcs/ilcs3.asp?ActID=609&ChapterID=8.
Instructions for downloading Estate Tax PDF forms :
IMPORTANT NOTICE - CHANGE OF PAYMENT
Effective July 1, 2012, as a result of the enactment of SB 3802 as P.A. 97-0732, any and all payments of Illinois estate tax, interest and penalties must now be made payable to the Illinois State Treasurer. Payments of estate taxes will no longer be accepted by the County Treasurer of the county in which the decedent died a resident.
A fillable form for making payment of the Illinois Estate Tax to the Illinois State Treasurer can be downloaded from the Illinois State Treasurer’s website located at: http://www.treasurer.il.gov/finances/estate-tax/estate-tax.aspx.
If you cannot download the PDF, please call Chicago (312) 814-2491 or Springfield (217) 524-5095 with questions or for further assistance.