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How do I file a correction for the IL-941 return?

You must electronically file Form IL-941-X, Amended Illinois Withholding Income Tax Return, with all required support, if

  • you need to correct amounts you reported on previously filed Forms IL-941 or IL-941-X,
  • you disagree with a change we made on your account, or
  • you are requesting approval of an overpayment for a refund.

If you made an error that requires a Form IL-941-X and you made the same reporting error on your return and your employee’s Form W-2 or payee’s Form 1099 or W-2G, you must also provide your employee or payee with a Form W-2c or corrected Form 1099 or W-2G, and attach copies to your Form IL-941-X. We encourage you to use MyTax Illinois to file and submit this form electronically.

You may access additional information by searching the entire Illinois Department of Revenue website.

If you have additional inquiries, you may submit them on the Questions, Comments, or Requests form.