Deadline for extended S corporations and partnerships

  • September 15, 2026
  • 11:59 PM
  • Ozfield Office
  • (773) 536-9272

Extended S Corporation and Partnership Deadline

Form 1120-S / Form 1065 on a timely extension. Same day as 3rd quarter estimated tax (Form 1040-ES). See extended returns due September 15.

If a business or individual fails to file these forms on time, they may be subject to penalties. The penalties for late filing can vary depending on the severity of the violation and the length of time the form was overdue. Please send us the info prior to the deadline.

  • 9:00 AM — 5:00 PM
    Ozfield Office
    Last Day to File Extended 1120-S and 1065
    If a business or individual fails to file these forms on time, they may be subject to penalties. The penalties for late filing can vary depending on the severity of the violation and the length of time the form was overdue. Please send us the info prior to the deadline.
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2026-9-1517:002026-9-1517:00America/Chicago Deadline for extended S corporations and partnerships Don't Miss the Deadline! Form 1120-S / Form 1065 on a timely extension is due September 15, 2026, the same day as 3rd quarter estimated tax (Form 1040-ES). Ozfield Office
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