October 15, 2018 @ 12:00 am - October 16, 2018 @ 12:00 am Individuals: File Form 1040, 1040A, or 1040EZ if you timely requested a 6-month extension.
October 15, 2018 @ 12:00 am - October 16, 2018 @ 12:00 am Deposit payroll tax for Sep if the monthly deposit rule applies.
October 15, 2018 @ 12:00 am - October 16, 2018 @ 12:00 am Corporations: File calendar year Form 1120 if you timely requested a 6-month extension.