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Due Dates for the 2011 Tax Season:

January 15, 2011

  • Individuals
    • Pay fourth installment of estimated income tax for 2010, accompanied by Form
      1040-ES and for CO Form 104-ES.
  • Corporations and S-corporations (years ending October 31, 2010)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return for an S Corporation, Form 1120S, or an application for extension of time to file, and pay the balance of the income tax, if any. Colorado corporations are due the same day as federal. A worksheet, Form 1120-W, is available to help you determine estimates, which will be due February 15, 2011, April 15, 2011, July 15, 2011 and October 17, 2011, of your tax for the next fiscal year. If extended, the federal return will be due July 15, 2011.
  • Trusts
    • Pay fourth installment of estimated tax for 2010, accompanied by Form 1041-ES
      and/or CO Form 105-ES.

February 1, 2011

  • Employers
    • Give employees their copies of Wage & Tax Statements, Form W-2, and suppliers
      Form 1099 for 2010.
    • File Annual Return of Withheld Federal Income Tax, Form 945, to report income tax
      withheld for 2010 on all non-payroll items, including backup withholding and
      withholding on pensions, annuities, gambling winnings and payments of Indian
      gaming profits to tribal members. Deposit any un-deposited tax. (If the total is less
      than $2,500 and not a shortfall, you can pay it when the return is filed.)
    • File Employer's Quarterly Federal Tax Return, Form 941, for the fourth quarter of
      2010. Deposit any un-deposited tax. (If the total is less than $2,500 and not a
      shortfall, you can pay when the return is filed.) Also file and pay any state taxes.
    • File Employer's Annual Federal Unemployment (FUTA) Tax Return, Form 940 or
      940-EZ for 2010. If your un-deposited tax is less than $100, you can either pay it
      with your return or deposit it. If it is more than $100, you must deposit it.

February 15, 2011

  • Corporations and S-corporations (years ending November 30, 2010)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. California corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due March 15, 2011, May 16, 2011, August 15,
      2011 and November 15, 2011, of your tax for the next fiscal year. If extended, the
      federal return will be due August 15, 2011, California due September 15, 2011.

March 1, 2011

  • Employers
    • File Transmittal of Income and Tax Statements, Form W-3, and related Wage and
      Tax Statements, Forms W-2, with the Social Security Administration.
    • File Annual Summary and Transmittal of U.S. Information Returns, Form 1096, and
      related Forms 1099 and 1098 with IRS.

March 15, 2011

  • Corporations and S-corporations (years ending December 31, 2010)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due April 15, 2011, June 15, 2011, September
      15, 2011 and December 15, 2011, of your tax for the next fiscal year. If extended,
      the federal return will be due September 15, 2011, Colorado due October 15, 2011.

April 15, 2011

  • Individuals
    • Pay first installment of estimated income tax for 2011, accompanied by Estimated
      Tax for Individuals, Form 1040-ES and/or Form 104-ES.
    • File U.S. Individual Income Tax Return, Form 1040, or application for extension of
      time to file, for 2010 with IRS and pay any tax due. Colorado return is due the
      same day.
  • Trusts
    • Pay first 2010 installment of estimated tax for 2011, accompanied by Estimated
      Income Tax for Fiduciaries, Form 1041-ES and/or Form 105-ES.
    • File U.S. Income Tax Return for Estates and Trusts, Form 1041, or file an
      application for extension of time to file, for 2010 with IRS and pay any tax due.
      Colorado return is due the same day. If extended, the return will be due
  • Partnerships
    • File U.S. Partnership Return of Income, Form 1065, or application for extension of
      time to file, for 2010 with IRS. Colorado return is due the same day. If extended,
      the return will be due September 15, 2011.
  • Corporations and S-corporations (years ending January 31, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due May 16, 2011, July 15, 2011, October 15,
      2011 and January 17, 2012, of your tax for the next fiscal year. If extended, the
      federal return will be due October 15, 2011, Colorado due November 15, 2011.

April 30, 2011

  • Employers
    • File Employers Quarterly Federal Tax Return, Form 941 for the first quarter of
      2010. Deposit any un-deposited tax. (If the total is less than $2,500 and not a
      shortfall, you can pay it when the return is filed.) Also file and pay any state taxes.

May 17, 2011

  • Exempt Organizations
    • File Return of Organization Exempt from Income Tax, Form 990, or file an
      application for extension of time to file, for 2010, with the IRS. Colorado returns
      are due the same day.
  • Corporations and S-corporations (years ending February 28, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due June 15, 2011, August 15, 2011, November
      15, 2011, and February 15, 2012, of your tax for the next fiscal year. If extended,
      the federal return will be due November 15, 2011, Colorado due December 15,
      2011.

June 15, 2011

  • Individuals
    • Pay second installment of estimated income tax for 2011, accompanied by Form
      1040-ES and/or Form 104-ES.
  • Trusts
    • Pay second installment of estimated tax for 2011, accompanied by Form 1041-ES
      and/or Forms 105-ES.
  • Corporations and S-corporations (years ending March 31, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due July 15, 2011, September 15, 2011,
      December 15, 2011 and March 15, 2012, of your tax for the next fiscal year. If
      extended, the federal return will be due December 15, 2011, Colorado due January
      17, 2012.

July 15, 2011

  • Corporations and S-corporations (years ending April 30, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due August 15, 2011, October 17, 2011,
      January 16, 2012 and April 16, 2012, of your tax for the next fiscal year. If
      extended, the federal return will be due January 16, 2012, Colorado due February
      15, 2012.

August 2, 2011

  • Employers
    • File Employer's Quarterly Federal Tax Return, Form 941, for the second quarter of
      2011. Deposit any un-deposited tax. (If the total is less than $2,500 and not a
      shortfall, you can pay it when the return is filed.) Also file and pay any state taxes.
  • Pension and Profit Sharing Plans
    • File Return/Report of Employee Benefit Plan, Form 5500-C/R, or apply for
      extension for time to file, for calendar year 2010 with IRS.

August 15, 2011

  • Corporations and S-corporations (years ending May 31, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due September 15, 2011, November 15, 2011,
      February 15, 2012 and May 15, 2012, of your tax for the next fiscal year. If
      extended, the federal return will be due February 15, 2012, Colorado due March
      15, 2012.

September 15, 2011

  • Individuals
    • Pay third installment of estimated income tax for 2011, accompanied by Form
      1040-ES, Estimated Income Tax for Individuals and/or Form 104-ES. Check this
      site for electronic payment requirements.
  • Corporations and S-corporations (years ending June 30, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due October 17, 2011, December 15, 2011,
      March 15, 2012 and June 15, 2012, of your tax for the next fiscal year. If
      extended, the federal return will be due March 15, 2012, Colorado due April 16,
      2012.
  • Trusts
    • Pay third installment of estimated tax for 2011, accompanied by Form 1041-ES
      and/or Form 105-ES.
    • If extended, file U.S. Income Tax Return for Estates and Trusts, Form 1041, for
      2010 with IRS and pay any tax, penalty and interest due.
  • Partnerships
    • If extended, file U.S. Partnership Return of Income, Form 1065, for 2010 with IRS.

October 15, 2011

  • Individuals
    • If extended, file U.S. Individual Income Tax Return, Form 1040, for 2010 with IRS
      and Franchise Tax Board and pay any tax, penalty and interest due.
  • Employers
    • If extended, file Annual Return/Report of Employee Benefit Plan, Form 5500, for
      2010.
  • Corporations and S-corporations (years ending July 31, 2011)
    o File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
    for an S Corporation, Form 1120S, or an application for extension of time to file,
    and pay the balance of the income tax, if any. Colorado corporations are due the
    same day as federal. A worksheet, Form 1120-W, is available to help you
    determine estimates, which will be due November 15, 2011, January 17, 2012,
    April 16, 2012 and July 16, 2012, of your tax for the next fiscal year. If extended,
    the federal return will be due April 15, 2012, Colorado due May 15, 2012.

October 31, 2011

  • Employers
    • File Employer's Quarterly Federal Tax Return, Form 941 for the third quarter of
      2010. Deposit any un-deposited tax. (If the total is less than $2,500 and not a
      shortfall, you can pay it when the return is filed.) Also file and pay any state taxes.

November 15, 2011

  • Corporations and S-corporations (years ending August 31, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. California corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due December 15, 2011, February 15, 2012,
      May 15, 2012 and August 15, 2012, of your tax for the next fiscal year. If extended
      the federal return will be due May 15, 2012, Colorado due June 15, 2012.

December 15, 2011

  • Corporations and S-corporations (years ending September 30, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due January 17, 2012, March 15, 2012, June
      15, 2012 and September 17, 2012, of your tax for the next fiscal year. If extended,
      the federal return will be due June 15, 2012, Colorado due July 16, 2012.

January 15, 2012

  • Individuals
    • Pay fourth installment of estimated income tax for 2011, accompanied by Form
      1040-ES and/or Form 104-ES. Check this site for Colorado electronic payment
      requirements.
  • Corporations and S-corporations (years ending October 31, 2011)
    • File U.S. Corporation Income Tax Return, Form 1120, or U.S. Income Tax Return
      for an S Corporation, Form 1120S, or an application for extension of time to file,
      and pay the balance of the income tax, if any. Colorado corporations are due the
      same day as federal. A worksheet, Form 1120-W, is available to help you
      determine estimates, which will be due February 15, 2012, April 16, 2012, July 16,
      2012 and October 15, 2012, of your tax for the next fiscal year. If extended, the
      federal return will be due July 15, 2013, Colorado due August 15, 2013.
  • Trusts
    • Pay fourth installment of estimated tax for 2011, accompanied by Form 1041-ES
      and/or Form 105-ES.

January 31, 2012

  • Employers
    • Give employees their copies of Wage & Tax Statements, Form W-2 and suppliers
      Form 1099 for 2011.
    • File Annual Return of Withheld Federal Income Tax, Form 945, to report income tax
      withheld for 2010 on all non-payroll items, including backup withholding and
      withholding on pensions, annuities, gambling winnings and payments of Indian
      gaming profits to tribal members. Deposit any un-deposited tax. (If the total is less
      than $2,500 and not a shortfall in prior payments, you can pay it when the return
      is filed.)
    • File Employer's Quarterly Federal Tax Return, Form 941, for the fourth quarter of
      2011. Deposit any un-deposited tax. (If the total is less than $2,500 and not a
      shortfall in prior payments, you can pay it when the return is filed.) Also file and
      pay any state taxes.
    • File Employer's Annual Federal Unemployment (FUTA) Tax Return, Form 940 or
      940-EZ for 2011. If your un-deposited tax is less than $100, you can either pay it
      with your return or deposit it. If it is more than $100, you must deposit it.


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