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  Below are some important dates having to do with tax deadlines. Mark these in your calendar, and be sure to allow a couple extra days.  
   
 

2012

March 15, 2012 Corporations
File Form 1120 for 2011 calendar year and pay any tax due. For automatic 6 month extension file Form 7004 and deposit estimated tax.
S-Corporations
File Form 1120S for 2011 calendar year and pay any tax due. Furnish a copy of Sch. K-1 for each shareholder. File Form 2553 to elect S Corporation status beginning with calendar year 2012.
Electing Large Partnerships
Furnish Sch. K-1 (Form 1065-B) to each partner.
April 17, 2012 Individuals
Deposit first installment of estimated income tax for 2012, accompanied by Estimated Tax for Individuals, Form 1040-ES.
File U.S. Individual Income Tax Return, Form 1040, or application for extension of time to file, for 2011 with IRS and pay any tax due.
Trusts
Deposit first installment of estimated tax for 2012, accompanied by Estimated Income Tax for Fiduciaries, Form 1041-ES.
File U.S. Income Tax Return for Estates and Trusts, Form 1041, or file an application for extension of time to file, for 2011 with IRS and pay any tax due. If extended, the return will be due September 17, 2012.
Partnerships
File U.S. Partnership Return of Income, Form 1065, or application for extension of time to file, for 2011 with IRS. If extended, the return will be due September 17, 2012.
April 30, 2012 Employers
File Employers Quarterly Federal Tax Return, Form 941 for the first quarter of 2012. 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 15, 2012 Exempt Organizations
File Return of Organization Exempt from Income Tax, Form 990, or file an application for extension of time to file, for 2011, with the IRS.
June 15, 2012 Individuals
Deposit second installment of estimated income tax for 2012, accompanied by Form 1040-ES.
Trusts
Deposit second installment of estimated tax for 2012, accompanied by Form 1041-ES.
July 31, 2012 Employers
File Employer's Quarterly Federal Tax Return, Form 941, for the second quarter of 2012. 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 2011 with IRS.
Sept 17, 2012 Individuals
Deposit third installment of estimated income tax for 2012, accompanied by Form 1040-ES, Estimated Income Tax for Individuals.
Trusts
Deposit third installment of estimated tax for 2012, accompanied by Form 1041-ES. If extended, file U.S. Income Tax Return for Estates and Trusts, Form 1041, for 2011 with IRS and pay any tax, penalty and interest due.
Partnerships
If extended, file U.S. Partnership Return of Income, Form 1065, for 2011 with IRS.
Oct 15, 2012 Individuals
If extended, file U.S. Individual Income Tax Return, Form 1040, for 2011 with IRS and pay any tax, penalty and interest due.
Employers
If extended, file Annual Return/Report of Employee Benefit Plan, Form 5500, for 2011.
Oct 31, 2012 Employers
File Employer's Quarterly Federal Tax Return, Form 941 for the third quarter of 2012. 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.