You can't pay your federal taxes with your state refund. On the summary screen, TurboTax will show you a combined total of your federal and state return amounts, but they are processed separately. When filing your state return, you have the option to receive a check (or direct deposit) or you can apply your refund from this year to your 2025 IL return.
To verify the option you chose, look at your IL tax return. Your refund amount is on Line 32.
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