it is not a retirement distribution so it is taxable in Illinois.
only the following is exempt
Line 27 — Payment of life insurance, endowment, or annuity benefits received. Enter the amount of payment of life insurance, endowment, or annuity benefits received before the time they would have ordinarily
been paid as an indemnity for a terminal illness. .
items exempt are listed in PUB 101
https://tax.illinois.gov/content/dam/soi/en/web/tax/research/publications/pubs/documents/pub-101.pdf
