• January 18, 2011
    • 1040 Estimated Tax Payments - Make a payment of your estimated tax if you did not pay your income tax for the year through withholding (or did not pay in enough tax that way). Use Form 1040-ES.
  • January 31, 2011
    • Form 941 Due Date - File Form 941 for the previous quarter.
  • March 15, 2011
    • 1120 Federal Due Date - Corporations. File a calendar year income tax return (Form 1120 or 1120-A) and pay any tax due. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.  S corporations. File a calendar year income tax return (Form 1120S) and pay any tax due. Provide each shareholder with a copy of Schedule K-1 (Form 1120S), Shareholder's Share of Income, Credits, Deductions, etc., or a substitute Schedule K-1. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.   S corporation election. File Form 2553, Election by a Small Business Corporation, to choose to be treated as an S corporation beginning with the current calendar year. If Form 2553 is filed late, S treatment will begin with the following calendar year.
    • Schedule K-1 to Partners Due Date - Electing large partnerships. Provide each partner with a copy of Schedule K-1 (Form 1065-B), Partner's Share of Income (Loss) From an Electing Large Partnership. This due date is effective for the first March 15 following the close of the partnership's tax year. The due date of March 15 applies even if the partnership requests an extension of time to file the Form 1065-B by filing Form 7004.
  • April 18, 2011
    • 1040 Federal Due Date - File an income tax return (Form 1040, 1040A, or 1040EZ) and pay any tax due. If you want an automatic 6-month extension of time to file the return, file Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return, or you can get an extension by phone or over the Internet. Then file Form 1040, 1040A, or 1040EZ by your 6-month extension.  If you are not paying your current year income tax through withholding (or will not pay in enough tax during the year that way), pay the first installment of your current year estimated tax. Use Form 1040-ES. For more information, see Publication 505.
    • 1040 Estimated Tax Payments - Make a payment of your estimated tax if you did not pay your income tax for the year through withholding (or did not pay in enough tax that way). Use Form 1040-ES.
    • 1065 Federal Due Date - Partnerships. File a calendar year return (Form 1065). Provide each partner with a copy of Schedule K-1 (Form 1065), Partner's Share of Income, Credits, Deductions, etc., or a substitute Schedule K-1. If you want an automatic 5-month extension of time to file the return and provide Schedule K-1 or a substitute Schedule K-1, file Form 7004. Then file Form 1065 by your 5-month extension.  Electing large partnerships. File a calendar year return (Form 1065-B). If you want an automatic 6-month extension of time to file the return, file Form 7004. Then file Form 1065-B by your 6-month extension.
    • 1120 Estimated Payments - Deposit an installment of estimated income tax. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.
  • May 2, 2011
    • Form 941 Due Date - File Form 941 for the previous quarter.
  • May 16, 2011
    • 990 Federal Due Date - Calendar year exempt organizations must file Form 990. If these organizations also had unrelated trade or business income, they must file Form 990-T
  • June 15, 2011
    • 1040 Estimated Tax Payments - Make a payment of your estimated tax if you did not pay your income tax for the year through withholding (or did not pay in enough tax that way). Use Form 1040-ES.
    • 1120 Estimated Payments - Deposit an installment of estimated income tax. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.
  • August 31, 2011
    • Form 941 Due Date - File Form 941 for the previous quarter.
  • September 15, 2011
    • 1040 Estimated Tax Payments - Make a payment of your estimated tax if you did not pay your income tax for the year through withholding (or did not pay in enough tax that way). Use Form 1040-ES.
    • 1120 Estimated Payments - Deposit an installment of estimated income tax. A worksheet, Form 1120-W, is available to help you estimate your tax for the year
    • 1120 Extension Due Date - Corporations. If you received an automatic 6-month extension, file a calendar year income tax return (Form 1120 or 1120-A) and pay any tax due.   S corporations. If you received an automatic 6-month extension, file a calendar year income tax return (Form 1120S) and pay any tax due. Provide each shareholder with a copy of Schedule K-1 (Form 1120S) or a substitute Schedule K-1. 
    • 1065 Extension Due Date - Partnerships. If you received an automatic 5-month extension, file a calendar year return (Form 1065). Provide each partner with a copy of Schedule K-1 (Form 1065) or a substitute K-1.
  • October 17, 2011
    • 1040 Extension Due Date - If you received an automatic 6-month extension, file an income tax return (Form 1040, 1040A, or 1040EZ) and pay any tax, interest, and penalties due.
  • October 31, 2011
    • Form 941 Due Date - File Form 941 for the previous quarter.
  • December 15, 2011
    • 1120 Estimated Payments - Deposit an installment of estimated income tax. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.