March 15, 2016 @ 12:00 am - March 16, 2016 @ 12:00 am Electing Large Partnerships: Furnish Sch. K-1 (Form 1065-B) to each partner.
March 15, 2016 @ 12:00 am - March 16, 2016 @ 12:00 am S Corporations: File Form 1120S for 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 2016. For automatic 6-month extension, file Form 7004 and deposit estimated tax.
March 15, 2016 @ 12:00 am - March 16, 2016 @ 12:00 am Deposit payroll tax for Feb if the monthly deposit rule applies.