The filing calendar for 2025 returns
Federal due dates that fall in calendar 2026, from IRS Publication 509. Weekend dates have already been rolled forward.
| Due date | What is due |
|---|---|
| February 2, 2026 | W-2s to employees (January 31 fell on a Saturday) |
| March 16, 2026 | Partnership (1065) and S corporation (1120-S) returns and K-1s (March 15 fell on a Sunday) |
| April 15, 2026 | Individual (1040) and calendar-year C corporation (1120) returns; first 2026 estimated payment |
| June 15, 2026 | Second 2026 estimated payment |
| September 15, 2026 | Extended 1065 and 1120-S returns; third 2026 estimated payment |
| October 15, 2026 | Extended 1040 and 1120 returns |
| December 15, 2026 | Fourth 2026 estimated payment for calendar-year corporations |
| January 15, 2027 | Fourth 2026 estimated payment for individuals |
From IRS.gov, checked October 10, 2026.