| 1040/1040-NR | 4/15/2024 (4/17/2024 for residents of Maine and Mass) |
| 1040/1040-NR on Extension | 10/15/2024 |
| 1120 | 4/15/2024 (or the 15th day of the 4th month after the end of the fiscal tax year) |
| 1120 fiscal year ending 6/30 | 9/16/2024 |
| 1120 on Extension | 10/15/2024 (or the 15th day of the 10th month after the end of the fiscal tax year) |
| 1120 fiscal year 6/30 on Ext. | 4/15/2024 (7-month extension) |
| 1065/1120-S | 3/15/2024 (or the 15th day of the 3rd month after the end of the fiscal tax year) |
| 1065/1120-S on Extension | 9/16/2024 (or the 15th day of the 9th month after the end of the fiscal tax year) |
| 1041 | 4/15/2024 (4/17/2024 for residents of Maine and Mass) (or the 15th day of the 4th month after the end of the fiscal tax year) |
| 1041 on Extension | 9/30/2024 or 10/15/2024 for bankruptcy estate |
| 990 / 990-EZ / 990-N | 5/15/2024 (or the 15th day of the 5th month after the end of the fiscal tax year) |
| Organization dissolved, terminated, or liquidated: 5-1/2 months after the last day |
|
| 990 or 990-EZ on Extension (no extension for 990-N) |
11/15/2024 (or the 15th day of the 11th month after the end of the fiscal tax year) |
| 990-T | 990 filers: 5/15/2024 (or the 15th day of the 5th month after the end of the fiscal tax year) |
| 990-T on Extension | 990 filers: 11/15/2024 (or the 15th day of the 11th month after the end of the fiscal tax year) |
| 706 | 9 months after the decedent's death |
| 706 on Extension | 6 months after the original due date |
| 709 (for gifts made in 2022) | 4/15/2024 |
| 709 on Extension | 10/15/2024 |
Additional Information:
IRS Publication 509 - Tax Calendars