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Form 1128 Illinois: What You Should Know

Gov You can file your Form IL-1120 on or before the 15th day of the 7th month after the close of the calendar year for which you are filing your return. If you file your return earlier than 15th of February, you must file your Form IL-1120 on or before the 7th October next following the close of the calendar year for which you are filing your return. Form IL-2022, Return of Corporation Income and Income Replacement Certificate. See “Income Tax‥ in the Form IL-2022 instructions 2023 Form IL-2023, Return of Corporation Income and Income Replacement Certificate—Sole Proprietor. 2023 Form IL-2023 — Sole Proprietor. See “Income Tax‥ in the Form IL-2023 instructions 2025 Form IL-2025–Sole Proprietor. (Income Tax and Certification of Sole Proprietor.) (Illinois). See “When should I file?‥ in the Form IL-2025 instructions 2026 Form IL-2046-Sole Proprietor. 2036 Tax Return Information Return, Corporation Income and Replacement Tax Return. See “Income Tax‥ in the Form IL-2026 instructions 2037 Income Tax Returns and Certification Documents. See “Income Tax‥ in the Form IL-2037 instructions 2042 Forms 1041(a)(6), 1041(b), 1041, and 1041P. See “Forms 1040‥, 1040EZ‥ and 1040A‥†. 2044 Forms W-2 and 1099‥. 2045 Federal Tax Bulletin 10 and 11. See “Forms 1099‥, 1324, and 3111‥ 2050 Federal Tax Bulletin. See “Forms 1099‥, 1324, and 3111‥ 2051 Federal Tax Bulletin. See “Forms 1099‥, 1324, and 3111‥ 2052 Federal Tax Bulletin. See “Forms 1099‥, 1324, and 3111‥ 2053 Federal Tax Bulletin. See “Forms 1099‥, 1324, and 3111‥ Form 1099-B — IRS.

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