In case you need to just prepare it by hand:
https://www2.illinois.gov/rev/forms/incometax/Documents/2017/individual/il-1040.pdf
https://www2.illinois.gov/rev/forms/incometax/Documents/2017/individual/il-1040-instr.pdf
You will need information from your 2017 federal return.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
