If you did not do any work in CT, all of your business income is IL-sourced, so you don't need to file a CT return (unless there is something in Box 5). Is there anything in Box 5?
Ask the payer why he added CT to box 6, it doesn't appear they should have referenced CT at all. Did you have a CT address on your W-9 form, maybe?
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
