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How to fill 1120-X Form: What You Should Know

If line 383 and line 391 are less than zero, enter zero. 2021 IL-1120-X Amended return overview & instructions — Illinois.gov If you receive the Notice of Overpayment of Tax due to a nonpayment of tax by a Form 1120, you: 1. If tax is refundable, you must file a copy of the Notice of Overpayment in the appropriate box on your form or send it with form 1120-X to us at the address on the front of the Notice. You may also obtain a copy of the Notice of Overpayment by completing Form 1120-X, and attaching a Notice of Overpayment to the form. 2. If the tax is not refundable, you must pay the tax with the amount shown on Form 1120-X. You may also pay the tax from a separate account. If you are paying this tax by checking or money order, use Form IL-1120-X-C, Payment by check or money order, to calculate if you must pay the tax, and who must receive and pay the tax. Attach the Form IL-1120-X-C to your check or money order and pay the tax. 3. If you made other income deductions on Form 1120 that were calculated after the 1120-X was filed, you must enter the amount of those deductions on line 4. 2021 IL-1120-X Amended return overview & instructions — Illinois.gov If you need to file Form IL-1120-X, you should not wait until December 31st. You should file it while the January 2024 Form 1120 is current (i.e., before the January 1st deadline in 2019). For information on how to file Form 1120-X, see Tax Filing Dates. 2021 IL-1120-X Instructions — Illinois.gov If you are submitting Form IL-1120-X in paper form, attach the original completed form. 2021 IL-1120-X — Illinois.gov If you are filing a paper tax return, you provide a Taxpayer Identification Number (TIN). You will also need to add the correct amount of filing information.

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