it seems Illinois is not yet ready for 2024 filing. whether online prep using MTI will be available is unknown at this time. you can try contacting them
If you have questions or need assistance, you can
email us at REV.TA-IIT@illinois.gov,
call us at 1 800 732-8866 or 217 782-3336 (TTY 1 800 544-5304), or
visit one of our local offices.
