2011 Tax Calendar- Businesses : S Corporations, Partnerships   Provide 1099s to recipients for certain payments made during the year and Form W-2 to employees January - 31   S Corporations : March - 15   File tax return Form 1120S for 2010 OR file for extension Provide each shareholders a copy of Schedule K-1 S Corporation elections : File Form 2553 for S Corporation status in calendar year 2011     Partnerships : April-15   File tax return Form 1065 for 2010 OR file for extension Provide each partner a copy of Schedule K-1     S Corporations : File 2011 tax return if requested an extension September -17   Partnerships : File 2011 tax return if requested an extension September - 17   Payroll   1] File 2011 Form 940 if you have not deposited FUTA tax when due Jan - 31   2] File 2011 Form 940 if you have deposited FUTA tax when due Jan - 31   3] Electronic filing of Forms W-2, 1099 April - 02   4] File Form 941 for the 1st quarter April - 30   5] File Form 941 for the 2nd quarter July 31   6] File Form 941 for the 3rd quarter Oct - 31   7] File Form 941 for the 4th quarter Jan 31