You would enter the state information just as it is reported on your W-2 with two separate lines of data, one for IL and one for NC. This should not cause any errors since it is the proper way to report the situation when two states are on one W-2.
According to the error message you shared, a duplicate entry in box 12 is being flagged. Box 12 is not related to the states at all. Double-check your box 12 information and be sure it has been entered accurately. Also double-check the error message you are seeing to be sure which section is being flagged.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
