IRS Important Dates:
- January 26, 2026 – IRS begins accepting turns
- January 15, 2026 – Fourth quarter estimated payments due for tax year 2025
- January 31, 2026 – Employers must mail W-2 forms
- April 15, 2026 – Tax Day/federal returns and payments due, final day for 401k contributions, final day to file an extension
- October 15, 2026 – Late filing deadline
|
Small Business |
Filing Deadline |
Extension Deadline |
|
Sole Proprietors |
April 15, 2026 |
Oct. 15, 2026 |
|
Partnerships |
March 16, 2026 |
Sept. 15, 2026 |
|
Multimember LLCs |
March 16, 2026 |
Sept. 15, 2026 |
|
S-Corps |
March 16, 2026 |
Sept. 15, 2026 |
|
C-Corps |
April 15, 2026 |
Oct. 15, 2026 |