To apply your refund to your 2021 Illinois taxes, please follow these steps:
- Go back into your IL return.
- In the Other situations section, click Edit.
- Click the Start/Revisit box next to Estimate tax payments for next year.
- On the screen, Do You Want to Pay Illinois Estimated Taxes for 2021? click the Yes box [even though you're just applying the overpayment]
- Just click through the screens, until you reach Apply Overpayment? Click the radio button next to Apply All and click Continue.
- The next screen will acknowledge that you chose to apply your refund to next year.
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