Mar 1- Farmers and Fisherman: File 2011  Form 1040 and pay any tax due. However, you have until Apr 17 to file if you paid your 2011 estimated tax payments by Jan 15, 2012.
Mar 2- Deposit payroll tax for payments on Feb 25-28 if the semiweekly deposit rule applies.
Mar 7- Ã‚ Deposit payroll tax for payments on Feb 29-Mar 2 if the semiweekly deposit rule applies.
Mar 9- Deposit payroll tax for payments on Mar 3-6 if the semiweekly deposit rule applies.
Mar 12- Employers: Employees are required to report to you tips of $20 or more earned during February.
Mar 14- Deposit payroll tax for payments on Mar 7-9 if the semiweekly deposit rule applies.
Mar 15- Corporations: File Form 1120 for 2011calendar year and pay any tax due. For automatic 6-month extension, file Form 7004 and deposit estimated tax. Employers: Deposit payroll tax for Feb if the monthly deposit rule applies. S Corporations: File Form 1120s for 2011 calendar year and pay any tax due. Furnish a copy of Sch. K-1 to each shareholder.File Form 2553 to elect S Corporation status beginning with calendar year 2012. ElectingLarge Partnerships: Furnish  Sch. K-1 (Form 1065-B) to each partner.
Mar 16- Deposit payroll tax for payments on Mar 10-13 if the semiweekly deposit rule applies.
Mar 21- Deposit payroll tax for payments on Mar 14-16 if the semiweekly deposit rule applies.
Mar 23- Deposit payroll tax for payments on Mar 17-20 if the semiweekly deposit rule applies.
Mar 28- Deposit payroll tax for payments on Mar 21-23 if the semiweekly deposit rule applies.
Mar 30- Ã‚ Deposit payroll tax for payments on Mar 24-27 if the semiweekly deposit rule applies.
Mar 31- File Form 2290 and pay the tax for vehicles first used in February. File Form 730 and pay the tax on wagers accepted during February.
paid your 2011 estimated tax payments by Jan 15, 2012.