| January 15 | Estimated Tax Payment for 4th Quarter of 2025 (Form 1040-ES) |
| April 15 | File 2025 Tax Return (Form 1040) and Pay Tax Due (except for residents of Maine and Massachusetts) |
| April 15 | File Form 4868 to Request 6-Month Income Tax Return Filing Extension (payment of tax not extended) |
| April 15 | File Schedule H (1040) and Pay Employment Taxes for Household Employees (file separately if Form 1040 is not filed) |
| April 15 | Estimated Tax Payment for 1st Quarter of 2026 (Form 1040-ES) |
| April 15 | Last Day to Contribute to Individual Retirement Account (IRA) for 2025 |
| April 15 | Withdraw Excess IRA Contributions in 2025 to Avoid Penalty if Filing of Form 1040 Was Not Extended |
| April 15 | Last Day to Contribute to Health Savings Account (HSA) for 2025 |
| June 15 | Estimated Tax Payment for 2nd Quarter of 2026 (Form 1040-ES) |
| June 15 | U.S. Taxpayers Living and Working Abroad File 2025 Tax Return (Form 1040) |
| June 15 | Military Personnel on Duty Outside the U.S. File 2025 Tax Return (Form 1040) |
| September 15 | Estimated Tax Payment for 3rd Quarter of 2026 (Form 1040-ES) |
| October 15 | File Extended 2025 Tax Return (Form 1040) and Pay Tax Due |
| October 15 | Contribute to Solo 401(k) Plan or Simplified Employee Pension (SEP) Plan for 2025 by Self-Employed if Filing of Form 1040 Was Extended |
| December 31 | Last Day to Contribute to Employer-Sponsored Retirement Plan for 2026 (401(k), 403(b), 457 or federal thrift savings plans) |
| December 31 | Last Day to Contribute to Employer-Sponsored Retirement Plan for 2026 (401(k), 403(b), 457 or federal thrift savings plans) |
| December 31 | Last Day to Contribute to Employer-Sponsored Retirement Plan for 2026 (401(k), 403(b), 457 or federal thrift savings plans) |
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