The following dates assume a December 31 year-end
|
| Date | IRS Form Number | Document Title | Extension Available |
| 1/15 | 1040-ES | Individual Payment Voucher | |
| 1/31 | 940 | Employer's Annual Federal Unemployment (FUTA) Tax Return | |
| 1/31 | 941 | Employer's Quarterly Federal Tax Return | |
| 1/31 | 1096 and 1099 | Miscellaneous Income, Interest Income, etc. | |
| 1/31 | W-2 | Wage and Tax Statement due to employee | |
| 2/28 | W-3, W-2 | Wage and Tax Statement due to Social Security Administration | |
| 3/15 | 1120, 1120S | U.S. Corporation Income Tax Return | 6 Months |
| 4/15 | 1040 | U.S. Individual Income Tax Return | |
| 4/15 | 1040-ES | Individual Payment Voucher | |
| 4/15 | Not IRS form | Contributions due for IRA's | |
| 4/15 | 1041 | U.S. Income Tax Return for Estates and Trusts | 6 Months |
| 4/15 | 1065 | U.S. Return of Partnership Income | 5 Months |
| 4/30 | 941 | Employer's Quarterly Federal Tax Return | |
| 4/30 | Not IRS form | King Country Personal Property report | |
| 5/15 | 990 | Return of Organization Exempt from Income Tax | 3 mos. (automatic) |
| 6/15 | 1040-ES | Individual Payment Voucher | |
| 7/31 | 941 | Employer's Quarterly Federal Tax Return | |
| 7/31 | 5500-EZ | Annual Return of One-Participant Retirement Plan | 3 months |
| 8/15 | 990 | Return of Organization Exempt from Income Tax (w/1st extension) | 3 mos. (with reason) |
| 9/15 | 1040-ES | Individual Payment Voucher | |
| 9/15 | 1065 | U.S. Return of Partnership Income (with extension) | |
| 9/15 | 1120 and 1120S | U.S. Corporation Income Tax Return (with extension) | |
| 10/15 | 1040 | U.S. Individual Income Tax Return (with extension) | |
| 10/15 | 1041 | U.S. Income Tax Return for Estates and Trusts (with extension) | |
| 10/31 | 941 | Employer's Quarterly Federal Tax Return | |
| 10/31 | 5500-EZ | Annual Return of One-Participant Retirement Plan (with extension) | |
| 11/15 | 990 | Return of Organization Exempt from Income Tax (w/2nd extension)
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