You will prepare a part-year resident return for each state. Prepare the IL return first, claiming all of your income earned up until you moved and then only your wages from then thru 12/31/2019.
Next prepare the part-year IN return claiming all of your income earned after moving there, including the IL wages, through 12/31.
To help prevent double taxation on the IL wages earned after moving to IN which both states are taxing, you may claim the other state tax credit on the IN return for the portion of IL's tax attributable to the wages earned after moving to IN. You will have to tell the TT Indiana program how much those wages were and the portion of IL tax attributable to that amount since TT cannot figure that out itself. TT Indiana will then compute that credit for you.
