2025 Tax Deadlines for Filing 2024 Business Returns |
|
| Partnership Tax Deadlines | Due Date |
| Original tax deadline for partnerships (Form 1065) | March 16, 2026* |
| Extension tax deadline for partnerships (Form 1065) | September 15, 2026 |
| S Corporation Tax Deadlines | Due Date |
| Original tax deadline for S Corporations (Form 1120-S) | March 16, 2026 |
| Extension tax deadline for S Corporations (Form 1120-S) | September 15, 2026 |
| C Corporation Tax Deadlines | Due Date |
| Original tax deadline for C Corporations (Form 1120) | April 15, 2026 |
| Extension tax deadline for C Corporations (Form 1120) | October 15, 2026 |
| Sole Proprietor Tax Deadlines | Due Date |
| Original tax deadline for sole proprietors and individuals (Form 1040) | April 15, 2026 |
| Extension tax deadline for sole proprietors and individuals (Form 1040) | October 15, 2026 |
| Nonprofit Tax Deadlines | Due Date |
| Original tax deadline for exempt organizations (Form 990) | May 15, 2026 |
| Extension tax deadline for exempt organizations (Form 990) | November 16, 2026 |
* March 15 is a Sunday, so the deadline will be the next business day, which is Monday, March16, 2026.