March 15
Corporations – File a 2015 calendar year income tax return (Form 1120) and pay any tax due. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.
S Corporations – File a 2015 calendar year income tax return (Form 1120S) and pay any tax due. Provide each shareholder with a copy of Schedule K-1 (Form 1120S), Shareholder’s Share of Income, Credits, Deductions, etc., or a substitute Schedule K-1. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.
S Corporation Election – File Form 2553, Election by a Small Business Corporation, to choose to be treated as an S corporation beginning with calendar year 2016.
March 31
Electronic filing of Forms W-2, 1098 and 1099 – File Forms 1098, 1099 or W-2 with the IRS. This due date applies only to the electronic filing of the forms with the IRS. The due date for giving the recipient these forms was February