For calendar year filers (entities using a December 31 year-end) that have already filed extensions, here are the due dates and the remaining time to file as of June 3, 2025:

📌 1. S Corporations (Form 1120-S), Partnerships (Form 1065), Multi-member LLCs

• Original due date: March 15, 2025
• Extended due date: September 15, 2025

📌 2. C Corporations (Form 1120) and Individuals (Form 1040)

Original due date: April 15, 2025

Extended due date: October 15, 2025