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The Ledger: Key Upcoming Dates

Key Upcoming Federal, Iowa, & Illinois Tax Deadlines  

Individuals
Federal & Illinois Q3 2026 estimated payment due 9/15/2026
Iowa Q3 2026 estimated payment due 9/30/2026
Federal & Illinois 2025 extended return due 10/15/2026
Iowa 2025 extended return due 11/2/2026
Partnerships
Federal 2025 extended return due 9/15/2026
Illinois Q3 2026 estimated payment due (PTET) 9/15/2026
Iowa Q3 2026 estimated payment due (PTET) 9/30/2026
Illinois 2025 extended return due 10/15/2026
Iowa 2025 extended return due 11/2/2026
C-corporations
Federal & Illinois Q3 2026 estimated payment due 9/15/2026
Iowa Q3 2026 estimated payment due 9/30/2026
Federal & Illinois 2025 extended return due 10/15/2026
Iowa 2025 extended return due 11/2/2026
Federal & Illinois Q4 2026 estimated payment due 12/15/2026
Iowa Q4 2026 estimated payment due 12/31/2026
S-corporations
Federal 2025 extended return due 9/15/2026
Illinois Q3 2026 estimated payment due (PTET) 9/15/2026
Iowa Q3 2026 estimated payment due (PTET) 9/30/2026
Illinois 2025 extended return due 10/15/2026
Iowa 2025 extended return due 11/2/2026
Illinois Q4 2025 estimated payment due (PTET) 12/15/2026
Trusts
Federal & Illinois Q3 2026 estimated payment due 9/15/2026
Federal 2025 extended return due 9/30/2026
Iowa Q3 2026 estimated payment due 9/30/2026
Illinois 2025 extended return due 10/15/2026
Iowa 2025 extended return due 11/2/2026
Exempt Organizations
Illinois 2025 extended return due 8/31/2026
Federal 2025 extended return due 11/16/2026
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