March 15, 2018 @ 12:00 am - March 16, 2018 @ 12:00 am Deposit payroll tax for Feb if the monthly deposit rule applies.
March 15, 2018 @ 12:00 am - March 16, 2018 @ 12:00 am S Corps: File Form 1120S for calendar year & pay any tax due. Furnish copy of Sch. K-1 to each shareholder. For automatic 6-month extension, file Form 7004 & deposit estimated tax. File Form 2553 to elect S Corp status beginning with calendar year 2018.
March 15, 2018 @ 12:00 am - March 16, 2018 @ 12:00 am Electing Large Partnerships: File Form 1065-B calendar year return. Furnish Sch. K-1 to each partner. For automatic 6-month extension File Form 7004.