Yes, you will be responsible for paying Illinois tax as soon as you start earning money from Illinois. Illinois does tax non-residents on Illinois sourced income. They have a flat 4.95% income tax rate on individuals, so you will want to make sure you are having at least that much withheld. This will determine whether you end up owing or getting a refund.
TurboTax does offer Illinois state tax preparation made easy by transferring everything needed from the federal information you enter to the state forms. You will have to answer a small bank of additional questions related specifically to the state because all of the states are very different from the federal and each other.
Here is a good resource for more in depth informatin regarding how Illinois taxes individual income:
https://tax.illinois.gov/individuals/taxableincome.html
Hope this helps!
Cindy
**Please say "Thanks" by clicking the thumbs up icon in a post
***Mark the post that answers your question by clicking on the "Mark as Best Answer"
